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LT3694EUFD#PBF

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Switching Voltage Regulators 36V, 2.6A Monolithic Buck Regulator With Dual LDO
Manufacturer: Analog Devices



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LT3694EUFD#PBF
Analog Devices

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Manufacturer
Analog Devices
Product Category
Switching Voltage Regulators
RoHS - XON
Y Icon ROHS
Mounting Style
Smd/Smt
Output Voltage
0.75 v to 16 V
Output Current
2.6 A
Number of Outputs
3 Output
Input Voltage MAX
36 V
Topology
Buck
Input Voltage MIN
4 V
Switching Frequency
250 Khz To 2.5 Mhz
Minimum Operating Temperature
- 40 C
Maximum Operating Temperature
+125 C
Series
Lt3694
Packaging
Tube
Input Voltage
4 v to 36 V
Operating Temperature Range
- 40 C to +125 C
Package / Case
QFN-28
Quiescent Current
1 mA
Type
Monolithic Buck Regulator With Dual Ldo
Brand
Analog Devices / Linear Technology
Shutdown
Shutdown
Development Kit
Dc1541a-A
Load Regulation
0.5 Mv/Ma
Operating Supply Current
1 mA
Product Type
Switching Voltage Regulators
Factory Pack Quantity :
73
Subcategory
Pmic - Power Management Ics
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Mfr. Part No.
Description
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1350

LT3694/LT3694-1 36V, 2.6A Monolithic Buck Regulator With Dual LDO FEATURES DESCRIPTION ? n Wide Input Range: 4V to 36V The LT 3694/LT3694-1 are monolithic, current mode n Overvoltage Shutdown Protects Circuit Through DC/DC converters with dual, low dropout regulator con- 70V Transients trollers. The switching converter is a step-down converter n 2.6A Output Switching Regulator with Internal capable of generating up to 2.6A at its output. Each regu- Power Switch lator has independent track/soft-start circuits simplifying n Dual, Low Dropout, Linear Regulator Controllers power supply sequencing and interfacing with micro- with Programmable Current Limit controllers and DSPs. n Tracking/Soft-Start Inputs and Power Good Output The switching frequency is set with a single resistor with a Simplify Soft-Start and Supply Sequencing range of 250kHz to 2.5MHz. The high switching frequency n Uses Small Inductors and Ceramic Capacitors permits the use of small inductors and ceramic capacitors n V = 0.75V (Buck and LDOs) OUT(MIN) leading to very small triple output solutions. The constant- n Adjustable 250kHz to 2.5MHz Switching Frequency switching frequency, combined with low impedance ce- n Accurate Enable Threshold Allows User ramic capacitors, results in low, predictable output ripple. Programmable Undervoltage Lockout Protection circuitry senses the current in the power switch n Options for Clock Synchronization (LT3694) or Clock and external Schottky catch diode to protect the LT3694 Output to Enable Synchronization to Other Switching against short-circuit conditions. Frequency foldback and Regulators (LT3694-1) thermal shutdown provide additional protection. n Thermally Enhanced 28-Lead 4mm ? 5mm QFN and With its wide input voltage range of 4V to 36V, the LT3694 20-Lead TSSOP Packages regulates a broad array of power sources from 4-cell batteries APPLICATIONS and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LT3694 can be n Automotive synchronized to an external clock with the SYNC pin while n Industrial the LT3694-1 offers a CLKOUT pin allowing other DC/DC n DSL and Cable Modems converters to synchronize to the LT3694-1 clock. n Distributed Power Regulation L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Wall Transformer Regulation of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION V IN Efficiency at V = 3.3V OUT 4.5V TO 36V 4.7?F EN/UVLO V BIAS BST IN 100 0.22?F f = 800kHz SW 4.7?H OUT1 TRK/SS1 SW 3.3V V = 4.5V IN 90 1.7A TRK/SS2 1nF B340A 34k V = 12V IN DA TRK/SS3 FB1 0.1? 47?F V = 36V LT3694 80 IN 330pF OUT1 LIM2 41.2k 10k V C1 DRV2 OUT2 70 LIM3 OUT1 2.5V 0.1? 450mA DRV3 24.9k OUT3 2.2?F 60 FB2 1.8V SYNC 450mA 15.4k 2.2?F 50 10.7k PGOOD FB3 0 1 2 3 51.1k 11k I (A) RT OUT GND 36941 TA01b f = 800kHz SW 36941 TA01a 36941fb 1 EFFICIENCY (%)LT3694/LT3694-1 36V, 2.6A Monolithic Buck Regulator With Dual LDO FEATURES DESCRIPTION ? n Wide Input Range: 4V to 36V The LT 3694/LT3694-1 are monolithic, current mode n Overvoltage Shutdown Protects Circuit Through DC/DC converters with dual, low dropout regulator con- 70V Transients trollers. The switching converter is a step-down converter n 2.6A Output Switching Regulator with Internal capable of generating up to 2.6A at its output. Each regu- Power Switch lator has independent track/soft-start circuits simplifying n Dual, Low Dropout, Linear Regulator Controllers power supply sequencing and interfacing with micro- with Programmable Current Limit controllers and DSPs. n Tracking/Soft-Start Inputs and Power Good Output The switching frequency is set with a single resistor with a Simplify Soft-Start and Supply Sequencing range of 250kHz to 2.5MHz. The high switching frequency n Uses Small Inductors and Ceramic Capacitors permits the use of small inductors and ceramic capacitors n V = 0.75V (Buck and LDOs) OUT(MIN) leading to very small triple output solutions. The constant- n Adjustable 250kHz to 2.5MHz Switching Frequency switching frequency, combined with low impedance ce- n Accurate Enable Threshold Allows User ramic capacitors, results in low, predictable output ripple. Programmable Undervoltage Lockout Protection circuitry senses the current in the power switch n Options for Clock Synchronization (LT3694) or Clock and external Schottky catch diode to protect the LT3694 Output to Enable Synchronization to Other Switching against short-circuit conditions. Frequency foldback and Regulators (LT3694-1) thermal shutdown provide additional protection. n Thermally Enhanced 28-Lead 4mm ? 5mm QFN and With its wide input voltage range of 4V to 36V, the LT3694 20-Lead TSSOP Packages regulates a broad array of power sources from 4-cell batteries APPLICATIONS and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LT3694 can be n Automotive synchronized to an external clock with the SYNC pin while n Industrial the LT3694-1 offers a CLKOUT pin allowing other DC/DC n DSL and Cable Modems converters to synchronize to the LT3694-1 clock. n Distributed Power Regulation L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Wall Transformer Regulation of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION V IN Efficiency at V = 3.3V OUT 4.5V TO 36V 4.7?F EN/UVLO V BIAS BST IN 100 0.22?F f = 800kHz SW 4.7?H OUT1 TRK/SS1 SW 3.3V V = 4.5V IN 90 1.7A TRK/SS2 1nF B340A 34k V = 12V IN DA TRK/SS3 FB1 0.1O 47?F V = 36V LT3694 80 IN 330pF OUT1 LIM2 41.2k 10k V C1 DRV2 OUT2 70 LIM3 OUT1 2.5V 0.1O 450mA DRV3 24.9k OUT3 2.2?F 60 FB2 1.8V SYNC 450mA 15.4k 2.2?F 50 10.7k PGOOD FB3 0 1 2 3 51.1k 11k I (A) RT OUT GND 36941 TA01b f = 800kHz SW 36941 TA01a 36941fb 1 EFFICIENCY (%)LT3694/LT3694-1 ABSOLUTE MAXIMUM RATINGS (Note 1) V , EN/UVLO (Note 6) ............................... ?0.3V to 70V Operating Junction Temperature Range (Notes 2 and 5) IN BST ...........................................................................55V LT3694E ............................................. ?40?C to 125?C BST Above SW ..........................................................25V LT3694I .............................................. ?40?C to 125?C PGOOD ......................................................................16V Storage Temperature Range ................... ?65?C to 150?C TRK/SS, V , FB, RT, SYNC Pins ...................................6V Lead Temperature (Soldering, 10 Sec) C BIAS, LIM2, LIM3 Pins ...............................................7V (TSSOP Only) ................................................... 300?C PIN CONFIGURATION TOP VIEW TOP VIEW V 1 20 SW IN 28 27 26 25 24 23 EN/UVLO 2 19 DA EN/UVLO 1 22 DA SYNC(CLKOUT) 3 18 BST SYNC (CLKOUT) 2 21 BST PGOOD 4 17 BIAS PGOOD 3 20 BIAS 29 RT 5 16 V RT 4 19 V 21 C1 C1 GND GND TRK/SS1 5 18 FB1 TRK/SS1 6 15 FB1 TRK/SS2 6 17 TRK/SS3 TRK/SS2 7 14 TRK/SS3 FB2 7 16 FB3 FB2 8 13 FB3 8 DRV2 15 DRV3 DRV2 9 12 DRV3 9 10 11 12 13 14 LIM2 10 11 LIM3 FE PACKAGE 20-LEAD PLASTIC TSSOP UFD PACKAGE ? = 38?C/W 28-LEAD (4mm ? 5mm) PLASTIC QFN JA EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB ? = 34?C/W JA LT3694-1 PINOUT IS SHOWN IN PARENTHESIS EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB LT3694-1 PINOUT IS SHOWN IN PARENTHESIS ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3694EUFD#PBF LT3694EUFD#TRPBF 3694 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694IUFD#PBF LT3694IUFD#TRPBF 3694 ?40?C to 125?C 28-Lead (4mm ? 5mm) Plastic QFN LT3694EFE#PBF LT3694EFE#TRPBF LT3694FE 20-Lead Plastic TSSOP ?40?C to 125?C LT3694IFE#PBF LT3694IFE#TRPBF LT3694FE 20-Lead Plastic TSSOP ?40?C to 125?C LT3694-1EUFD#PBF LT3694-1EUFD#TRPBF 36941 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694-1IUFD#PBF LT3694-1IUFD#TRPBF 36941 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694-1EFE#PBF LT3694-1EFE#TRPBF LT3694FE-1 20-Lead Plastic TSSOP ?40?C to 125?C LT3694-1IFE#PBF LT3694-1IFE#TRPBF LT3694FE-1 20-Lead Plastic TSSOP ?40?C to 125?C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 36941fb 2 LIM2 V IN GND V IN GND GND GND GND GND SW LIM3 SWLT3694/LT3694-1 36V, 2.6A Monolithic Buck Regulator With Dual LDO FEATURES DESCRIPTION ? n Wide Input Range: 4V to 36V The LT 3694/LT3694-1 are monolithic, current mode n Overvoltage Shutdown Protects Circuit Through DC/DC converters with dual, low dropout regulator con- 70V Transients trollers. The switching converter is a step-down converter n 2.6A Output Switching Regulator with Internal capable of generating up to 2.6A at its output. Each regu- Power Switch lator has independent track/soft-start circuits simplifying n Dual, Low Dropout, Linear Regulator Controllers power supply sequencing and interfacing with micro- with Programmable Current Limit controllers and DSPs. n Tracking/Soft-Start Inputs and Power Good Output The switching frequency is set with a single resistor with a Simplify Soft-Start and Supply Sequencing range of 250kHz to 2.5MHz. The high switching frequency n Uses Small Inductors and Ceramic Capacitors permits the use of small inductors and ceramic capacitors n V = 0.75V (Buck and LDOs) OUT(MIN) leading to very small triple output solutions. The constant- n Adjustable 250kHz to 2.5MHz Switching Frequency switching frequency, combined with low impedance ce- n Accurate Enable Threshold Allows User ramic capacitors, results in low, predictable output ripple. Programmable Undervoltage Lockout Protection circuitry senses the current in the power switch n Options for Clock Synchronization (LT3694) or Clock and external Schottky catch diode to protect the LT3694 Output to Enable Synchronization to Other Switching against short-circuit conditions. Frequency foldback and Regulators (LT3694-1) thermal shutdown provide additional protection. n Thermally Enhanced 28-Lead 4mm ? 5mm QFN and With its wide input voltage range of 4V to 36V, the LT3694 20-Lead TSSOP Packages regulates a broad array of power sources from 4-cell batteries APPLICATIONS and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LT3694 can be n Automotive synchronized to an external clock with the SYNC pin while n Industrial the LT3694-1 offers a CLKOUT pin allowing other DC/DC n DSL and Cable Modems converters to synchronize to the LT3694-1 clock. n Distributed Power Regulation L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Wall Transformer Regulation of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION V IN Efficiency at V = 3.3V OUT 4.5V TO 36V 4.7?F EN/UVLO V BIAS BST IN 100 0.22?F f = 800kHz SW 4.7?H OUT1 TRK/SS1 SW 3.3V V = 4.5V IN 90 1.7A TRK/SS2 1nF B340A 34k V = 12V IN DA TRK/SS3 FB1 0.1O 47?F V = 36V LT3694 80 IN 330pF OUT1 LIM2 41.2k 10k V C1 DRV2 OUT2 70 LIM3 OUT1 2.5V 0.1O 450mA DRV3 24.9k OUT3 2.2?F 60 FB2 1.8V SYNC 450mA 15.4k 2.2?F 50 10.7k PGOOD FB3 0 1 2 3 51.1k 11k I (A) RT OUT GND 36941 TA01b f = 800kHz SW 36941 TA01a 36941fb 1 EFFICIENCY (%)LT3694/LT3694-1 36V, 2.6A Monolithic Buck Regulator With Dual LDO FEATURES DESCRIPTION ? n Wide Input Range: 4V to 36V The LT 3694/LT3694-1 are monolithic, current mode n Overvoltage Shutdown Protects Circuit Through DC/DC converters with dual, low dropout regulator con- 70V Transients trollers. The switching converter is a step-down converter n 2.6A Output Switching Regulator with Internal capable of generating up to 2.6A at its output. Each regu- Power Switch lator has independent track/soft-start circuits simplifying n Dual, Low Dropout, Linear Regulator Controllers power supply sequencing and interfacing with micro- with Programmable Current Limit controllers and DSPs. n Tracking/Soft-Start Inputs and Power Good Output The switching frequency is set with a single resistor with a Simplify Soft-Start and Supply Sequencing range of 250kHz to 2.5MHz. The high switching frequency n Uses Small Inductors and Ceramic Capacitors permits the use of small inductors and ceramic capacitors n V = 0.75V (Buck and LDOs) OUT(MIN) leading to very small triple output solutions. The constant- n Adjustable 250kHz to 2.5MHz Switching Frequency switching frequency, combined with low impedance ce- n Accurate Enable Threshold Allows User ramic capacitors, results in low, predictable output ripple. Programmable Undervoltage Lockout Protection circuitry senses the current in the power switch n Options for Clock Synchronization (LT3694) or Clock and external Schottky catch diode to protect the LT3694 Output to Enable Synchronization to Other Switching against short-circuit conditions. Frequency foldback and Regulators (LT3694-1) thermal shutdown provide additional protection. n Thermally Enhanced 28-Lead 4mm ? 5mm QFN and With its wide input voltage range of 4V to 36V, the LT3694 20-Lead TSSOP Packages regulates a broad array of power sources from 4-cell batteries APPLICATIONS and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LT3694 can be n Automotive synchronized to an external clock with the SYNC pin while n Industrial the LT3694-1 offers a CLKOUT pin allowing other DC/DC n DSL and Cable Modems converters to synchronize to the LT3694-1 clock. n Distributed Power Regulation L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Wall Transformer Regulation of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION V IN Efficiency at V = 3.3V OUT 4.5V TO 36V 4.7?F EN/UVLO V BIAS BST IN 100 0.22?F f = 800kHz SW 4.7?H OUT1 TRK/SS1 SW 3.3V V = 4.5V IN 90 1.7A TRK/SS2 1nF B340A 34k V = 12V IN DA TRK/SS3 FB1 0.1O 47?F V = 36V LT3694 80 IN 330pF OUT1 LIM2 41.2k 10k V C1 DRV2 OUT2 70 LIM3 OUT1 2.5V 0.1O 450mA DRV3 24.9k OUT3 2.2?F 60 FB2 1.8V SYNC 450mA 15.4k 2.2?F 50 10.7k PGOOD FB3 0 1 2 3 51.1k 11k I (A) RT OUT GND 36941 TA01b f = 800kHz SW 36941 TA01a 36941fb 1 EFFICIENCY (%)LT3694/LT3694-1 ABSOLUTE MAXIMUM RATINGS (Note 1) V , EN/UVLO (Note 6) ............................... ?0.3V to 70V Operating Junction Temperature Range (Notes 2 and 5) IN BST ...........................................................................55V LT3694E ............................................. ?40?C to 125?C BST Above SW ..........................................................25V LT3694I .............................................. ?40?C to 125?C PGOOD ......................................................................16V Storage Temperature Range ................... ?65?C to 150?C TRK/SS, V , FB, RT, SYNC Pins ...................................6V Lead Temperature (Soldering, 10 Sec) C BIAS, LIM2, LIM3 Pins ...............................................7V (TSSOP Only) ................................................... 300?C PIN CONFIGURATION TOP VIEW TOP VIEW V 1 20 SW IN 28 27 26 25 24 23 EN/UVLO 2 19 DA EN/UVLO 1 22 DA SYNC(CLKOUT) 3 18 BST SYNC (CLKOUT) 2 21 BST PGOOD 4 17 BIAS PGOOD 3 20 BIAS 29 RT 5 16 V RT 4 19 V 21 C1 C1 GND GND TRK/SS1 5 18 FB1 TRK/SS1 6 15 FB1 TRK/SS2 6 17 TRK/SS3 TRK/SS2 7 14 TRK/SS3 FB2 7 16 FB3 FB2 8 13 FB3 8 DRV2 15 DRV3 DRV2 9 12 DRV3 9 10 11 12 13 14 LIM2 10 11 LIM3 FE PACKAGE 20-LEAD PLASTIC TSSOP UFD PACKAGE ? = 38?C/W 28-LEAD (4mm ? 5mm) PLASTIC QFN JA EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB ? = 34?C/W JA LT3694-1 PINOUT IS SHOWN IN PARENTHESIS EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB LT3694-1 PINOUT IS SHOWN IN PARENTHESIS ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3694EUFD#PBF LT3694EUFD#TRPBF 3694 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694IUFD#PBF LT3694IUFD#TRPBF 3694 ?40?C to 125?C 28-Lead (4mm ? 5mm) Plastic QFN LT3694EFE#PBF LT3694EFE#TRPBF LT3694FE 20-Lead Plastic TSSOP ?40?C to 125?C LT3694IFE#PBF LT3694IFE#TRPBF LT3694FE 20-Lead Plastic TSSOP ?40?C to 125?C LT3694-1EUFD#PBF LT3694-1EUFD#TRPBF 36941 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694-1IUFD#PBF LT3694-1IUFD#TRPBF 36941 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694-1EFE#PBF LT3694-1EFE#TRPBF LT3694FE-1 20-Lead Plastic TSSOP ?40?C to 125?C LT3694-1IFE#PBF LT3694-1IFE#TRPBF LT3694FE-1 20-Lead Plastic TSSOP ?40?C to 125?C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 36941fb 2 LIM2 V IN GND V IN GND GND GND GND GND SW LIM3 SWLT3694/LT3694-1 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25?C, V = 12V, V = 3V, unless otherwise noted. (Notes 2, 9) A IN BIAS PARAMETER CONDITIONS MIN TYP MAX UNITS l V Internal Undervoltage Lockout 3.5 3.8 4 V IN l Overvoltage Shutdown Threshold 36 38 40 V Input Quiescent Current Not Switching 1 2 mA Bias Quiescent Current Not Switching 2 3.5 mA Shutdown Current V = 0.1V 0.1 2 ?A EN/UVLO EN/UVLO Threshold, Bias On 350 500 mV l EN/UVLO Threshold, Switching On 1.16 1.2 1.23 V Reference Voltage Line Regulation 5V < V < 36V 0.01 %/V IN Switching Frequency R = 40.2k l 0.9 1.0 1.1 MHz T SYNC Input Frequency Range LT3694 Only l 0.25 2.5 MHz l V , SYNC LT3694 Only 1.5 V IH l V , SYNC LT3694 Only 0.35 V IL l V , CLKOUT I = ?50?A, LT3694-1 Only 1.6 2.6 V OH CLKOUT V , CLKOUT I = 50?A, LT3694-1 Only l 0.3 V OL CLKOUT PGOOD Output Voltage Low I = 250?A 0.2 0.4 V PGOOD PGOOD Leakage V = 2V 10 1000 nA PGOOD PGOOD Threshold (Relative to V ) (Note 8) 86 90 94 % FB Switching Regulator Feedback Pin Voltage l 735 750 765 mV Feedback Pin Bias Current l ?50 ?500 nA Error Amplifier Transconductance 350 ?S Error Amplifier Voltage Gain 600 V/V TRK/SS Pull-Up Current ?2 ?3 ?4 ?A TRK/SS Threshold to Start Switching 35 50 70 mV V Source Current V = 0.6V ?20 ?A C1 C V Sink Current V = 0.6V 28 ?A C1 C V Clamp Voltage 2 V C1 V Switching Threshold 0.75 V C1 V to Switch Current Gain 3.6 A/V C1 Switch Leakage Current V = 36V 0.01 10 ?A IN Minimum Boost Voltage Above Switch (Note 4) 1.8 2.5 V l Switch Current Limit (Note 3) (Note 3) 10% Duty Cycle 3.5 4.9 6 A Switch V I = 3A 600 mV CESAT SW1 BST Operating Current I = 3A 60 mA SW1 V , BST Diode I = 100mA 0.8 V F BST I BST Diode V ? V = 36V 1 ?A L BST BIAS l DA Current Limit 2.6 3.6 4.5 A l Minimum Switch Off-Time 140 ns 36941fb 3LT3694/LT3694-1 36V, 2.6A Monolithic Buck Regulator With Dual LDO FEATURES DESCRIPTION ? n Wide Input Range: 4V to 36V The LT 3694/LT3694-1 are monolithic, current mode n Overvoltage Shutdown Protects Circuit Through DC/DC converters with dual, low dropout regulator con- 70V Transients trollers. The switching converter is a step-down converter n 2.6A Output Switching Regulator with Internal capable of generating up to 2.6A at its output. Each regu- Power Switch lator has independent track/soft-start circuits simplifying n Dual, Low Dropout, Linear Regulator Controllers power supply sequencing and interfacing with micro- with Programmable Current Limit controllers and DSPs. n Tracking/Soft-Start Inputs and Power Good Output The switching frequency is set with a single resistor with a Simplify Soft-Start and Supply Sequencing range of 250kHz to 2.5MHz. The high switching frequency n Uses Small Inductors and Ceramic Capacitors permits the use of small inductors and ceramic capacitors n V = 0.75V (Buck and LDOs) OUT(MIN) leading to very small triple output solutions. The constant- n Adjustable 250kHz to 2.5MHz Switching Frequency switching frequency, combined with low impedance ce- n Accurate Enable Threshold Allows User ramic capacitors, results in low, predictable output ripple. Programmable Undervoltage Lockout Protection circuitry senses the current in the power switch n Options for Clock Synchronization (LT3694) or Clock and external Schottky catch diode to protect the LT3694 Output to Enable Synchronization to Other Switching against short-circuit conditions. Frequency foldback and Regulators (LT3694-1) thermal shutdown provide additional protection. n Thermally Enhanced 28-Lead 4mm ? 5mm QFN and With its wide input voltage range of 4V to 36V, the LT3694 20-Lead TSSOP Packages regulates a broad array of power sources from 4-cell batteries APPLICATIONS and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LT3694 can be n Automotive synchronized to an external clock with the SYNC pin while n Industrial the LT3694-1 offers a CLKOUT pin allowing other DC/DC n DSL and Cable Modems converters to synchronize to the LT3694-1 clock. n Distributed Power Regulation L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Wall Transformer Regulation of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION V IN Efficiency at V = 3.3V OUT 4.5V TO 36V 4.7?F EN/UVLO V BIAS BST IN 100 0.22?F f = 800kHz SW 4.7?H OUT1 TRK/SS1 SW 3.3V V = 4.5V IN 90 1.7A TRK/SS2 1nF B340A 34k V = 12V IN DA TRK/SS3 FB1 0.1O 47?F V = 36V LT3694 80 IN 330pF OUT1 LIM2 41.2k 10k V C1 DRV2 OUT2 70 LIM3 OUT1 2.5V 0.1O 450mA DRV3 24.9k OUT3 2.2?F 60 FB2 1.8V SYNC 450mA 15.4k 2.2?F 50 10.7k PGOOD FB3 0 1 2 3 51.1k 11k I (A) RT OUT GND 36941 TA01b f = 800kHz SW 36941 TA01a 36941fb 1 EFFICIENCY (%)LT3694/LT3694-1 36V, 2.6A Monolithic Buck Regulator With Dual LDO FEATURES DESCRIPTION ? n Wide Input Range: 4V to 36V The LT 3694/LT3694-1 are monolithic, current mode n Overvoltage Shutdown Protects Circuit Through DC/DC converters with dual, low dropout regulator con- 70V Transients trollers. The switching converter is a step-down converter n 2.6A Output Switching Regulator with Internal capable of generating up to 2.6A at its output. Each regu- Power Switch lator has independent track/soft-start circuits simplifying n Dual, Low Dropout, Linear Regulator Controllers power supply sequencing and interfacing with micro- with Programmable Current Limit controllers and DSPs. n Tracking/Soft-Start Inputs and Power Good Output The switching frequency is set with a single resistor with a Simplify Soft-Start and Supply Sequencing range of 250kHz to 2.5MHz. The high switching frequency n Uses Small Inductors and Ceramic Capacitors permits the use of small inductors and ceramic capacitors n V = 0.75V (Buck and LDOs) OUT(MIN) leading to very small triple output solutions. The constant- n Adjustable 250kHz to 2.5MHz Switching Frequency switching frequency, combined with low impedance ce- n Accurate Enable Threshold Allows User ramic capacitors, results in low, predictable output ripple. Programmable Undervoltage Lockout Protection circuitry senses the current in the power switch n Options for Clock Synchronization (LT3694) or Clock and external Schottky catch diode to protect the LT3694 Output to Enable Synchronization to Other Switching against short-circuit conditions. Frequency foldback and Regulators (LT3694-1) thermal shutdown provide additional protection. n Thermally Enhanced 28-Lead 4mm ? 5mm QFN and With its wide input voltage range of 4V to 36V, the LT3694 20-Lead TSSOP Packages regulates a broad array of power sources from 4-cell batteries APPLICATIONS and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LT3694 can be n Automotive synchronized to an external clock with the SYNC pin while n Industrial the LT3694-1 offers a CLKOUT pin allowing other DC/DC n DSL and Cable Modems converters to synchronize to the LT3694-1 clock. n Distributed Power Regulation L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Wall Transformer Regulation of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION V IN Efficiency at V = 3.3V OUT 4.5V TO 36V 4.7?F EN/UVLO V BIAS BST IN 100 0.22?F f = 800kHz SW 4.7?H OUT1 TRK/SS1 SW 3.3V V = 4.5V IN 90 1.7A TRK/SS2 1nF B340A 34k V = 12V IN DA TRK/SS3 FB1 0.1O 47?F V = 36V LT3694 80 IN 330pF OUT1 LIM2 41.2k 10k V C1 DRV2 OUT2 70 LIM3 OUT1 2.5V 0.1O 450mA DRV3 24.9k OUT3 2.2?F 60 FB2 1.8V SYNC 450mA 15.4k 2.2?F 50 10.7k PGOOD FB3 0 1 2 3 51.1k 11k I (A) RT OUT GND 36941 TA01b f = 800kHz SW 36941 TA01a 36941fb 1 EFFICIENCY (%)LT3694/LT3694-1 ABSOLUTE MAXIMUM RATINGS (Note 1) V , EN/UVLO (Note 6) ............................... ?0.3V to 70V Operating Junction Temperature Range (Notes 2 and 5) IN BST ...........................................................................55V LT3694E ............................................. ?40?C to 125?C BST Above SW ..........................................................25V LT3694I .............................................. ?40?C to 125?C PGOOD ......................................................................16V Storage Temperature Range ................... ?65?C to 150?C TRK/SS, V , FB, RT, SYNC Pins ...................................6V Lead Temperature (Soldering, 10 Sec) C BIAS, LIM2, LIM3 Pins ...............................................7V (TSSOP Only) ................................................... 300?C PIN CONFIGURATION TOP VIEW TOP VIEW V 1 20 SW IN 28 27 26 25 24 23 EN/UVLO 2 19 DA EN/UVLO 1 22 DA SYNC(CLKOUT) 3 18 BST SYNC (CLKOUT) 2 21 BST PGOOD 4 17 BIAS PGOOD 3 20 BIAS 29 RT 5 16 V RT 4 19 V 21 C1 C1 GND GND TRK/SS1 5 18 FB1 TRK/SS1 6 15 FB1 TRK/SS2 6 17 TRK/SS3 TRK/SS2 7 14 TRK/SS3 FB2 7 16 FB3 FB2 8 13 FB3 8 DRV2 15 DRV3 DRV2 9 12 DRV3 9 10 11 12 13 14 LIM2 10 11 LIM3 FE PACKAGE 20-LEAD PLASTIC TSSOP UFD PACKAGE ? = 38?C/W 28-LEAD (4mm ? 5mm) PLASTIC QFN JA EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB ? = 34?C/W JA LT3694-1 PINOUT IS SHOWN IN PARENTHESIS EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB LT3694-1 PINOUT IS SHOWN IN PARENTHESIS ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3694EUFD#PBF LT3694EUFD#TRPBF 3694 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694IUFD#PBF LT3694IUFD#TRPBF 3694 ?40?C to 125?C 28-Lead (4mm ? 5mm) Plastic QFN LT3694EFE#PBF LT3694EFE#TRPBF LT3694FE 20-Lead Plastic TSSOP ?40?C to 125?C LT3694IFE#PBF LT3694IFE#TRPBF LT3694FE 20-Lead Plastic TSSOP ?40?C to 125?C LT3694-1EUFD#PBF LT3694-1EUFD#TRPBF 36941 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694-1IUFD#PBF LT3694-1IUFD#TRPBF 36941 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694-1EFE#PBF LT3694-1EFE#TRPBF LT3694FE-1 20-Lead Plastic TSSOP ?40?C to 125?C LT3694-1IFE#PBF LT3694-1IFE#TRPBF LT3694FE-1 20-Lead Plastic TSSOP ?40?C to 125?C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 36941fb 2 LIM2 V IN GND V IN GND GND GND GND GND SW LIM3 SWLT3694/LT3694-1 36V, 2.6A Monolithic Buck Regulator With Dual LDO FEATURES DESCRIPTION ? n Wide Input Range: 4V to 36V The LT 3694/LT3694-1 are monolithic, current mode n Overvoltage Shutdown Protects Circuit Through DC/DC converters with dual, low dropout regulator con- 70V Transients trollers. The switching converter is a step-down converter n 2.6A Output Switching Regulator with Internal capable of generating up to 2.6A at its output. Each regu- Power Switch lator has independent track/soft-start circuits simplifying n Dual, Low Dropout, Linear Regulator Controllers power supply sequencing and interfacing with micro- with Programmable Current Limit controllers and DSPs. n Tracking/Soft-Start Inputs and Power Good Output The switching frequency is set with a single resistor with a Simplify Soft-Start and Supply Sequencing range of 250kHz to 2.5MHz. The high switching frequency n Uses Small Inductors and Ceramic Capacitors permits the use of small inductors and ceramic capacitors n V = 0.75V (Buck and LDOs) OUT(MIN) leading to very small triple output solutions. The constant- n Adjustable 250kHz to 2.5MHz Switching Frequency switching frequency, combined with low impedance ce- n Accurate Enable Threshold Allows User ramic capacitors, results in low, predictable output ripple. Programmable Undervoltage Lockout Protection circuitry senses the current in the power switch n Options for Clock Synchronization (LT3694) or Clock and external Schottky catch diode to protect the LT3694 Output to Enable Synchronization to Other Switching against short-circuit conditions. Frequency foldback and Regulators (LT3694-1) thermal shutdown provide additional protection. n Thermally Enhanced 28-Lead 4mm ? 5mm QFN and With its wide input voltage range of 4V to 36V, the LT3694 20-Lead TSSOP Packages regulates a broad array of power sources from 4-cell batteries APPLICATIONS and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LT3694 can be n Automotive synchronized to an external clock with the SYNC pin while n Industrial the LT3694-1 offers a CLKOUT pin allowing other DC/DC n DSL and Cable Modems converters to synchronize to the LT3694-1 clock. n Distributed Power Regulation L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Wall Transformer Regulation of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION V IN Efficiency at V = 3.3V OUT 4.5V TO 36V 4.7?F EN/UVLO V BIAS BST IN 100 0.22?F f = 800kHz SW 4.7?H OUT1 TRK/SS1 SW 3.3V V = 4.5V IN 90 1.7A TRK/SS2 1nF B340A 34k V = 12V IN DA TRK/SS3 FB1 0.1O 47?F V = 36V LT3694 80 IN 330pF OUT1 LIM2 41.2k 10k V C1 DRV2 OUT2 70 LIM3 OUT1 2.5V 0.1O 450mA DRV3 24.9k OUT3 2.2?F 60 FB2 1.8V SYNC 450mA 15.4k 2.2?F 50 10.7k PGOOD FB3 0 1 2 3 51.1k 11k I (A) RT OUT GND 36941 TA01b f = 800kHz SW 36941 TA01a 36941fb 1 EFFICIENCY (%)LT3694/LT3694-1 36V, 2.6A Monolithic Buck Regulator With Dual LDO FEATURES DESCRIPTION ? n Wide Input Range: 4V to 36V The LT 3694/LT3694-1 are monolithic, current mode n Overvoltage Shutdown Protects Circuit Through DC/DC converters with dual, low dropout regulator con- 70V Transients trollers. The switching converter is a step-down converter n 2.6A Output Switching Regulator with Internal capable of generating up to 2.6A at its output. Each regu- Power Switch lator has independent track/soft-start circuits simplifying n Dual, Low Dropout, Linear Regulator Controllers power supply sequencing and interfacing with micro- with Programmable Current Limit controllers and DSPs. n Tracking/Soft-Start Inputs and Power Good Output The switching frequency is set with a single resistor with a Simplify Soft-Start and Supply Sequencing range of 250kHz to 2.5MHz. The high switching frequency n Uses Small Inductors and Ceramic Capacitors permits the use of small inductors and ceramic capacitors n V = 0.75V (Buck and LDOs) OUT(MIN) leading to very small triple output solutions. The constant- n Adjustable 250kHz to 2.5MHz Switching Frequency switching frequency, combined with low impedance ce- n Accurate Enable Threshold Allows User ramic capacitors, results in low, predictable output ripple. Programmable Undervoltage Lockout Protection circuitry senses the current in the power switch n Options for Clock Synchronization (LT3694) or Clock and external Schottky catch diode to protect the LT3694 Output to Enable Synchronization to Other Switching against short-circuit conditions. Frequency foldback and Regulators (LT3694-1) thermal shutdown provide additional protection. n Thermally Enhanced 28-Lead 4mm ? 5mm QFN and With its wide input voltage range of 4V to 36V, the LT3694 20-Lead TSSOP Packages regulates a broad array of power sources from 4-cell batteries APPLICATIONS and 5V logic rails to unregulated wall transformers, lead acid batteries and distributed power supplies. The LT3694 can be n Automotive synchronized to an external clock with the SYNC pin while n Industrial the LT3694-1 offers a CLKOUT pin allowing other DC/DC n DSL and Cable Modems converters to synchronize to the LT3694-1 clock. n Distributed Power Regulation L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks n Wall Transformer Regulation of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION V IN Efficiency at V = 3.3V OUT 4.5V TO 36V 4.7?F EN/UVLO V BIAS BST IN 100 0.22?F f = 800kHz SW 4.7?H OUT1 TRK/SS1 SW 3.3V V = 4.5V IN 90 1.7A TRK/SS2 1nF B340A 34k V = 12V IN DA TRK/SS3 FB1 0.1O 47?F V = 36V LT3694 80 IN 330pF OUT1 LIM2 41.2k 10k V C1 DRV2 OUT2 70 LIM3 OUT1 2.5V 0.1O 450mA DRV3 24.9k OUT3 2.2?F 60 FB2 1.8V SYNC 450mA 15.4k 2.2?F 50 10.7k PGOOD FB3 0 1 2 3 51.1k 11k I (A) RT OUT GND 36941 TA01b f = 800kHz SW 36941 TA01a 36941fb 1 EFFICIENCY (%)LT3694/LT3694-1 ABSOLUTE MAXIMUM RATINGS (Note 1) V , EN/UVLO (Note 6) ............................... ?0.3V to 70V Operating Junction Temperature Range (Notes 2 and 5) IN BST ...........................................................................55V LT3694E ............................................. ?40?C to 125?C BST Above SW ..........................................................25V LT3694I .............................................. ?40?C to 125?C PGOOD ......................................................................16V Storage Temperature Range ................... ?65?C to 150?C TRK/SS, V , FB, RT, SYNC Pins ...................................6V Lead Temperature (Soldering, 10 Sec) C BIAS, LIM2, LIM3 Pins ...............................................7V (TSSOP Only) ................................................... 300?C PIN CONFIGURATION TOP VIEW TOP VIEW V 1 20 SW IN 28 27 26 25 24 23 EN/UVLO 2 19 DA EN/UVLO 1 22 DA SYNC(CLKOUT) 3 18 BST SYNC (CLKOUT) 2 21 BST PGOOD 4 17 BIAS PGOOD 3 20 BIAS 29 RT 5 16 V RT 4 19 V 21 C1 C1 GND GND TRK/SS1 5 18 FB1 TRK/SS1 6 15 FB1 TRK/SS2 6 17 TRK/SS3 TRK/SS2 7 14 TRK/SS3 FB2 7 16 FB3 FB2 8 13 FB3 8 DRV2 15 DRV3 DRV2 9 12 DRV3 9 10 11 12 13 14 LIM2 10 11 LIM3 FE PACKAGE 20-LEAD PLASTIC TSSOP UFD PACKAGE ? = 38?C/W 28-LEAD (4mm ? 5mm) PLASTIC QFN JA EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB ? = 34?C/W JA LT3694-1 PINOUT IS SHOWN IN PARENTHESIS EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB LT3694-1 PINOUT IS SHOWN IN PARENTHESIS ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3694EUFD#PBF LT3694EUFD#TRPBF 3694 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694IUFD#PBF LT3694IUFD#TRPBF 3694 ?40?C to 125?C 28-Lead (4mm ? 5mm) Plastic QFN LT3694EFE#PBF LT3694EFE#TRPBF LT3694FE 20-Lead Plastic TSSOP ?40?C to 125?C LT3694IFE#PBF LT3694IFE#TRPBF LT3694FE 20-Lead Plastic TSSOP ?40?C to 125?C LT3694-1EUFD#PBF LT3694-1EUFD#TRPBF 36941 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694-1IUFD#PBF LT3694-1IUFD#TRPBF 36941 28-Lead (4mm ? 5mm) Plastic QFN ?40?C to 125?C LT3694-1EFE#PBF LT3694-1EFE#TRPBF LT3694FE-1 20-Lead Plastic TSSOP ?40?C to 125?C LT3694-1IFE#PBF LT3694-1IFE#TRPBF LT3694FE-1 20-Lead Plastic TSSOP ?40?C to 125?C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 36941fb 2 LIM2 V IN GND V IN GND GND GND GND GND SW LIM3 SWLT3694/LT3694-1 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25?C, V = 12V, V = 3V, unless otherwise noted. (Notes 2, 9) A IN BIAS PARAMETER CONDITIONS MIN TYP MAX UNITS l V Internal Undervoltage Lockout 3.5 3.8 4 V IN l Overvoltage Shutdown Threshold 36 38 40 V Input Quiescent Current Not Switching 1 2 mA Bias Quiescent Current Not Switching 2 3.5 mA Shutdown Current V = 0.1V 0.1 2 ?A EN/UVLO EN/UVLO Threshold, Bias On 350 500 mV l EN/UVLO Threshold, Switching On 1.16 1.2 1.23 V Reference Voltage Line Regulation 5V < V < 36V 0.01 %/V IN Switching Frequency R = 40.2k l 0.9 1.0 1.1 MHz T SYNC Input Frequency Range LT3694 Only l 0.25 2.5 MHz l V , SYNC LT3694 Only 1.5 V IH l V , SYNC LT3694 Only 0.35 V IL l V , CLKOUT I = ?50?A, LT3694-1 Only 1.6 2.6 V OH CLKOUT V , CLKOUT I = 50?A, LT3694-1 Only l 0.3 V OL CLKOUT PGOOD Output Voltage Low I = 250?A 0.2 0.4 V PGOOD PGOOD Leakage V = 2V 10 1000 nA PGOOD PGOOD Threshold (Relative to V ) (Note 8) 86 90 94 % FB Switching Regulator Feedback Pin Voltage l 735 750 765 mV Feedback Pin Bias Current l ?50 ?500 nA Error Amplifier Transconductance 350 ?S Error Amplifier Voltage Gain 600 V/V TRK/SS Pull-Up Current ?2 ?3 ?4 ?A TRK/SS Threshold to Start Switching 35 50 70 mV V Source Current V = 0.6V ?20 ?A C1 C V Sink Current V = 0.6V 28 ?A C1 C V Clamp Voltage 2 V C1 V Switching Threshold 0.75 V C1 V to Switch Current Gain 3.6 A/V C1 Switch Leakage Current V = 36V 0.01 10 ?A IN Minimum Boost Voltage Above Switch (Note 4) 1.8 2.5 V l Switch Current Limit (Note 3) (Note 3) 10% Duty Cycle 3.5 4.9 6 A Switch V I = 3A 600 mV CESAT SW1 BST Operating Current I = 3A 60 mA SW1 V , BST Diode I = 100mA 0.8 V F BST I BST Diode V ? V = 36V 1 ?A L BST BIAS l DA Current Limit 2.6 3.6 4.5 A l Minimum Switch Off-Time 140 ns 36941fb 3

Tariff Concession Code
Tariff Desc

Free
8542.31.00 51 No ..Application Specific (Digital) Integrated Circuits (ASIC)

Electronic integrated circuits: Processors and controllers, whether or not combined with memories, converters, logic circuits, amplifiers, clock and timing circuits, or other circuits
Monolithic integrated circuits:
AD4
ANALOG DEVICES
Analog Devices Hittite
ANALOG DEVICES (LINEAR TECHNOLOGY)
Analog Devices / Hittite
Analog Devices / Linear Technology
Analog Devices Inc
Analog Devices Inc.
Analog Devices, Inc.
ANALOG MICRO ELECTRONICS
ANALOG MICROELECTRONICS
LINEAR
LINEAR TECH
Linear Technology
Linear Technology (part of ADI)
LT
LT4
Technology