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LTC1875EGN#PBF

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Datasheet
Switching Voltage Regulators 15uA Quiescent Current, 1.5A Synch Step-dwn Reg
Manufacturer: Analog Devices



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160 - Global Stock


Ships to you between Tue. 27 Apr to Thu. 29 Apr

MOQ : 1
Multiples : 1

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LTC1875EGN#PBF
Analog Devices

1 : $ 13.9056
10 : $ 9.4334
50 : $ 8.505
100 : $ 7.8418
200 : $ 7.5766
500 : $ 7.2948
1000 : $ 7.1786

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Manufacturer
Analog Devices
Product Category
Switching Voltage Regulators
RoHS - XON
Y Icon ROHS
Mounting Style
Smd/Smt
Output Voltage
0.8 v to 6 V
Output Current
1.5 A
Number of Outputs
1 Output
Input Voltage MAX
6 V
Topology
Buck
Input Voltage MIN
2.65 V
Switching Frequency
550 Khz
Minimum Operating Temperature
- 40 C
Maximum Operating Temperature
+85 C
Series
Ltc1875
Packaging
Tube
Height
1.75 mm
Input Voltage
3.6 V
Operating Temperature Range
- 40 C to +85 C
Package / Case
SSOP-16
Quiescent Current
270 uA
Type
Synchronous Step-Down Regulator
Brand
Analog Devices
Shutdown
Shutdown
Development Kit
Dc432b
Operating Supply Current
0.015 mA
Product Type
Switching Voltage Regulators
Factory Pack Quantity :
100
Subcategory
Pmic - Power Management Ics
Cnhts
8542390000
Hts Code
8542390001
Mxhts
85423901
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LTC1875 15m A Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTIO ? n High Efficiency: Up to 95% The LTC 1875 is a high efficiency 1.5A monolithic syn- n Low Quiescent Current: Only 15m A with No Load chronous buck regulator using a constant frequency, n 550kHz Constant Frequency Operation current mode architecture. Operating supply current is n 2.65V to 6V Input Voltage Range only 15m A with no load and drops to <1m A in shutdown. n V from 0.8V to V , I to 1.5A The input supply voltage range of 2.65V to 6V makes the OUT IN OUT n True PLL Frequency Locking from 350kHz to 750kHz LTC1875 ideally suited for single Li-Ion battery-powered n Power Good Output Voltage Monitor applications. 100% duty cycle provides low dropout op- n Low Dropout Operation: 100% Duty Cycle eration, extending battery life in portable systems. ? n Burst Mode or Pulse Skipping Operation The switching frequency is internally set to 550kHz, allow- n Current Mode Operation for Excellent Line and Load ing the use of small surface mount inductors and capaci- Transient Response tors. For noise sensitive applications, the LTC1875 can be n Shutdown Mode Draws <1m A Supply Current externally synchronized from 350kHz to 750kHz. Burst n ? 2% Output Voltage Accuracy Mode operation is inhibited during synchronization or n Overcurrent and Overtemperature Protected when the SYNC/MODE pin is pulled low. n Available in 16-Lead SSOP Package The internal synchronous switch increases efficiency and U eliminates the need for an external Schottky diode. Low APPLICATIO S output voltages are easily supported with a 0.8V feedback reference voltage. The LTC1875 is available in a 16-lead n Portable Computers SSOP package. n Portable Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. n Wireless Modems Burst Mode is a registered trademark of Linear Technology Corporation. TYPICAL APPLICATIO High Efficiency Step-Down Converter Efficiency vs Output Load Current V IN 2.65V TO 6V 100 C IN V = 3.6V 22?F IN 95 SV IN RUN/SS PV IN 90 L1 V = 4.2V 85 IN SYNC/MODE SWP 6.8?H V * OUT V = 6V IN LTC1875 80 3.3V PGOOD SWN + 75 C OUT 150k 47?F I PGND TH 70 88.7k 47pF 220pF 65 V FB Burst Mode OPERATION SGND 60 V = 3.3V 28.0k OUT L = 6.8?H 55 1875 TA01 0.1 1 10 100 1000 C : TAIYO YUDEN CERAMIC JMK325BJ226MM IN OUPUT CURRENT (mA) C : SANYO POSCAP 6TPA47M OUT 1875 TA01a L1: TOKO 646CY-6R8M *V CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.3V OUT IN IN 1875f 1 EFFICIENCY (%) U ULTC1875 15m A Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTIO ? n High Efficiency: Up to 95% The LTC 1875 is a high efficiency 1.5A monolithic syn- n Low Quiescent Current: Only 15m A with No Load chronous buck regulator using a constant frequency, n 550kHz Constant Frequency Operation current mode architecture. Operating supply current is n 2.65V to 6V Input Voltage Range only 15m A with no load and drops to <1m A in shutdown. n V from 0.8V to V , I to 1.5A The input supply voltage range of 2.65V to 6V makes the OUT IN OUT n True PLL Frequency Locking from 350kHz to 750kHz LTC1875 ideally suited for single Li-Ion battery-powered n Power Good Output Voltage Monitor applications. 100% duty cycle provides low dropout op- n Low Dropout Operation: 100% Duty Cycle eration, extending battery life in portable systems. ? n Burst Mode or Pulse Skipping Operation The switching frequency is internally set to 550kHz, allow- n Current Mode Operation for Excellent Line and Load ing the use of small surface mount inductors and capaci- Transient Response tors. For noise sensitive applications, the LTC1875 can be n Shutdown Mode Draws <1m A Supply Current externally synchronized from 350kHz to 750kHz. Burst n ? 2% Output Voltage Accuracy Mode operation is inhibited during synchronization or n Overcurrent and Overtemperature Protected when the SYNC/MODE pin is pulled low. n Available in 16-Lead SSOP Package The internal synchronous switch increases efficiency and U eliminates the need for an external Schottky diode. Low APPLICATIO S output voltages are easily supported with a 0.8V feedback reference voltage. The LTC1875 is available in a 16-lead n Portable Computers SSOP package. n Portable Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. n Wireless Modems Burst Mode is a registered trademark of Linear Technology Corporation. TYPICAL APPLICATIO High Efficiency Step-Down Converter Efficiency vs Output Load Current V IN 2.65V TO 6V 100 C IN V = 3.6V 22?F IN 95 SV IN RUN/SS PV IN 90 L1 V = 4.2V 85 IN SYNC/MODE SWP 6.8?H V * OUT V = 6V IN LTC1875 80 3.3V PGOOD SWN + 75 C OUT 150k 47?F I PGND TH 70 88.7k 47pF 220pF 65 V FB Burst Mode OPERATION SGND 60 V = 3.3V 28.0k OUT L = 6.8?H 55 1875 TA01 0.1 1 10 100 1000 C : TAIYO YUDEN CERAMIC JMK325BJ226MM IN OUPUT CURRENT (mA) C : SANYO POSCAP 6TPA47M OUT 1875 TA01a L1: TOKO 646CY-6R8M *V CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.3V OUT IN IN 1875f 1 EFFICIENCY (%) U ULTC1875 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) ORDER PART Input Supply Voltage .................................. ?0.3V to 7V TOP VIEW NUMBER I , PLL_LPF Voltages ............................. ?0.3V to 2.7V TH SGND 1 16 PLL_LPF RUN/SS, V Voltages ............................... ?0.3V to V FB IN RUN/SS 2 15 SYNC/MODE LTC1875EGN SYNC/MODE Voltage ................................. ?0.3V to V IN V 3 14 PGOOD FB (V ? V ) Voltage............................... ?0.3V to 7V PVIN SWP I 4 13 SV TH IN V Voltage .............................................. ?0.3V to 7V SWN SWP1 5 12 SWP2 P-Channel Switch Source Current (DC) .................... 2A SWN1 6 11 SWN2 GN PART N-Channel Switch Sink Current (DC) ........................ 2A PGND1 7 10 PGND2 MARKING Peak Switching Sink and Source Current ................. 3A PV 8 9 PV IN1 IN2 Operating Ambient Temperature Range 1875 GN PACKAGE 16-LEAD PLASTIC SSOP (Note 2) ............................................. ?40 C to 85 C T = 125 C, q = 110 C/ W, q = 40 C/ W JMAX JA JC Junction Temperature (Note 3, 6)........................ 125 C Storage Temperature Range ................ ? 65 C to 150 C Lead Temperature (Soldering, 10 sec)................. 300 C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C. V = 3.6V unless otherwise noted. A IN SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I Feedback Current (Note 4) l 860 nA VFB V Regulated Output Voltage (Note 4) 0 C ? T ? 85 C 0.784 0.80 0.816 V FB A (Note 4) ?40 C ? T ? 85 C l 0.740 0.80 0.840 V A D V Overvoltage Trip Limit with Respect to V D V = V ? V l 20 60 110 mV OVL FB OVL OVL FB D V Undervoltage Trip Limit with Respect to V D V = V ? V l 20 60 110 mV UVL FB UVL FB UVL D V /V Reference Voltage Line Regulation V = 2.65V to 6V (Note 4) 0.05 0.25 %/V FB FB IN V Output Voltage Load Regulation Measured in Servo Loop, V = 0.9V to 1.2V l 0.1 0.6 % LOADREG ITH Measured in Servo Loop, V = 1.6V to 1.2V l ?0.1 ?0.6 % ITH V Input Voltage Range l 2.65 6 V IN I Input DC Bias Current (Note 5) Q Pulse Skipping Mode 2.65V < V < 6V, V = 0V, I = 0A 270 365 m A IN SYNC/MODE OUT Burst Mode Operation V = V , I = 0A 15 22 m A SYNC/MODE IN OUT Shutdown V = 0V, V = 6V 0 1 m A RUN IN f SYNC Capture Range 350 750 kHz SYNC f Oscillator Frequency V ? 0.7V 495 550 605 kHz OSC FB = 0V 80 kHz V FB I Phase Detector Output Current PLLLPF Sinking Capability f < f l 3 10 20 m A PLLIN OSC Sourcing Capability f > f l ?3 ?10 ?20 m A PPLIN SOC R R of P-Channel FET I = 100mA, V = 5V 0.28 0.35 W PFET DS(ON) SW IN R R of N-Channel FET I = ? 100mA, V = 5V 0.35 0.4 W NFET DS(ON) SW IN I Peak Inductor Current V = 0.7V, Duty Cycle < 35%, V = 3V 1.6 2.15 2.75 A PK FB IN I SW Leakage V = 0V, V = 0V or 6V, V = 6V ? 0.01 ? 2.5 m A LSW RUN SW IN V SYNC/MODE Threshold l 0.2 1.0 1.5 V SYNC/MODE I SYNC/MODE Leakage Current ? 0.01 ? 1 m A SYNC/MODE 1875f 2 U W U U WWWLTC1875 15m A Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTIO ? n High Efficiency: Up to 95% The LTC 1875 is a high efficiency 1.5A monolithic syn- n Low Quiescent Current: Only 15m A with No Load chronous buck regulator using a constant frequency, n 550kHz Constant Frequency Operation current mode architecture. Operating supply current is n 2.65V to 6V Input Voltage Range only 15m A with no load and drops to <1m A in shutdown. n V from 0.8V to V , I to 1.5A The input supply voltage range of 2.65V to 6V makes the OUT IN OUT n True PLL Frequency Locking from 350kHz to 750kHz LTC1875 ideally suited for single Li-Ion battery-powered n Power Good Output Voltage Monitor applications. 100% duty cycle provides low dropout op- n Low Dropout Operation: 100% Duty Cycle eration, extending battery life in portable systems. ? n Burst Mode or Pulse Skipping Operation The switching frequency is internally set to 550kHz, allow- n Current Mode Operation for Excellent Line and Load ing the use of small surface mount inductors and capaci- Transient Response tors. For noise sensitive applications, the LTC1875 can be n Shutdown Mode Draws <1m A Supply Current externally synchronized from 350kHz to 750kHz. Burst n ? 2% Output Voltage Accuracy Mode operation is inhibited during synchronization or n Overcurrent and Overtemperature Protected when the SYNC/MODE pin is pulled low. n Available in 16-Lead SSOP Package The internal synchronous switch increases efficiency and U eliminates the need for an external Schottky diode. Low APPLICATIO S output voltages are easily supported with a 0.8V feedback reference voltage. The LTC1875 is available in a 16-lead n Portable Computers SSOP package. n Portable Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. n Wireless Modems Burst Mode is a registered trademark of Linear Technology Corporation. TYPICAL APPLICATIO High Efficiency Step-Down Converter Efficiency vs Output Load Current V IN 2.65V TO 6V 100 C IN V = 3.6V 22?F IN 95 SV IN RUN/SS PV IN 90 L1 V = 4.2V 85 IN SYNC/MODE SWP 6.8?H V * OUT V = 6V IN LTC1875 80 3.3V PGOOD SWN + 75 C OUT 150k 47?F I PGND TH 70 88.7k 47pF 220pF 65 V FB Burst Mode OPERATION SGND 60 V = 3.3V 28.0k OUT L = 6.8?H 55 1875 TA01 0.1 1 10 100 1000 C : TAIYO YUDEN CERAMIC JMK325BJ226MM IN OUPUT CURRENT (mA) C : SANYO POSCAP 6TPA47M OUT 1875 TA01a L1: TOKO 646CY-6R8M *V CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.3V OUT IN IN 1875f 1 EFFICIENCY (%) U ULTC1875 15m A Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTIO ? n High Efficiency: Up to 95% The LTC 1875 is a high efficiency 1.5A monolithic syn- n Low Quiescent Current: Only 15m A with No Load chronous buck regulator using a constant frequency, n 550kHz Constant Frequency Operation current mode architecture. Operating supply current is n 2.65V to 6V Input Voltage Range only 15m A with no load and drops to <1m A in shutdown. n V from 0.8V to V , I to 1.5A The input supply voltage range of 2.65V to 6V makes the OUT IN OUT n True PLL Frequency Locking from 350kHz to 750kHz LTC1875 ideally suited for single Li-Ion battery-powered n Power Good Output Voltage Monitor applications. 100% duty cycle provides low dropout op- n Low Dropout Operation: 100% Duty Cycle eration, extending battery life in portable systems. ? n Burst Mode or Pulse Skipping Operation The switching frequency is internally set to 550kHz, allow- n Current Mode Operation for Excellent Line and Load ing the use of small surface mount inductors and capaci- Transient Response tors. For noise sensitive applications, the LTC1875 can be n Shutdown Mode Draws <1m A Supply Current externally synchronized from 350kHz to 750kHz. Burst n ? 2% Output Voltage Accuracy Mode operation is inhibited during synchronization or n Overcurrent and Overtemperature Protected when the SYNC/MODE pin is pulled low. n Available in 16-Lead SSOP Package The internal synchronous switch increases efficiency and U eliminates the need for an external Schottky diode. Low APPLICATIO S output voltages are easily supported with a 0.8V feedback reference voltage. The LTC1875 is available in a 16-lead n Portable Computers SSOP package. n Portable Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. n Wireless Modems Burst Mode is a registered trademark of Linear Technology Corporation. TYPICAL APPLICATIO High Efficiency Step-Down Converter Efficiency vs Output Load Current V IN 2.65V TO 6V 100 C IN V = 3.6V 22?F IN 95 SV IN RUN/SS PV IN 90 L1 V = 4.2V 85 IN SYNC/MODE SWP 6.8?H V * OUT V = 6V IN LTC1875 80 3.3V PGOOD SWN + 75 C OUT 150k 47?F I PGND TH 70 88.7k 47pF 220pF 65 V FB Burst Mode OPERATION SGND 60 V = 3.3V 28.0k OUT L = 6.8?H 55 1875 TA01 0.1 1 10 100 1000 C : TAIYO YUDEN CERAMIC JMK325BJ226MM IN OUPUT CURRENT (mA) C : SANYO POSCAP 6TPA47M OUT 1875 TA01a L1: TOKO 646CY-6R8M *V CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.3V OUT IN IN 1875f 1 EFFICIENCY (%) U ULTC1875 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) ORDER PART Input Supply Voltage .................................. ?0.3V to 7V TOP VIEW NUMBER I , PLL_LPF Voltages ............................. ?0.3V to 2.7V TH SGND 1 16 PLL_LPF RUN/SS, V Voltages ............................... ?0.3V to V FB IN RUN/SS 2 15 SYNC/MODE LTC1875EGN SYNC/MODE Voltage ................................. ?0.3V to V IN V 3 14 PGOOD FB (V ? V ) Voltage............................... ?0.3V to 7V PVIN SWP I 4 13 SV TH IN V Voltage .............................................. ?0.3V to 7V SWN SWP1 5 12 SWP2 P-Channel Switch Source Current (DC) .................... 2A SWN1 6 11 SWN2 GN PART N-Channel Switch Sink Current (DC) ........................ 2A PGND1 7 10 PGND2 MARKING Peak Switching Sink and Source Current ................. 3A PV 8 9 PV IN1 IN2 Operating Ambient Temperature Range 1875 GN PACKAGE 16-LEAD PLASTIC SSOP (Note 2) ............................................. ?40 C to 85 C T = 125 C, q = 110 C/ W, q = 40 C/ W JMAX JA JC Junction Temperature (Note 3, 6)........................ 125 C Storage Temperature Range ................ ? 65 C to 150 C Lead Temperature (Soldering, 10 sec)................. 300 C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C. V = 3.6V unless otherwise noted. A IN SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I Feedback Current (Note 4) l 860 nA VFB V Regulated Output Voltage (Note 4) 0 C ? T ? 85 C 0.784 0.80 0.816 V FB A (Note 4) ?40 C ? T ? 85 C l 0.740 0.80 0.840 V A D V Overvoltage Trip Limit with Respect to V D V = V ? V l 20 60 110 mV OVL FB OVL OVL FB D V Undervoltage Trip Limit with Respect to V D V = V ? V l 20 60 110 mV UVL FB UVL FB UVL D V /V Reference Voltage Line Regulation V = 2.65V to 6V (Note 4) 0.05 0.25 %/V FB FB IN V Output Voltage Load Regulation Measured in Servo Loop, V = 0.9V to 1.2V l 0.1 0.6 % LOADREG ITH Measured in Servo Loop, V = 1.6V to 1.2V l ?0.1 ?0.6 % ITH V Input Voltage Range l 2.65 6 V IN I Input DC Bias Current (Note 5) Q Pulse Skipping Mode 2.65V < V < 6V, V = 0V, I = 0A 270 365 m A IN SYNC/MODE OUT Burst Mode Operation V = V , I = 0A 15 22 m A SYNC/MODE IN OUT Shutdown V = 0V, V = 6V 0 1 m A RUN IN f SYNC Capture Range 350 750 kHz SYNC f Oscillator Frequency V ? 0.7V 495 550 605 kHz OSC FB = 0V 80 kHz V FB I Phase Detector Output Current PLLLPF Sinking Capability f < f l 3 10 20 m A PLLIN OSC Sourcing Capability f > f l ?3 ?10 ?20 m A PPLIN SOC R R of P-Channel FET I = 100mA, V = 5V 0.28 0.35 W PFET DS(ON) SW IN R R of N-Channel FET I = ? 100mA, V = 5V 0.35 0.4 W NFET DS(ON) SW IN I Peak Inductor Current V = 0.7V, Duty Cycle < 35%, V = 3V 1.6 2.15 2.75 A PK FB IN I SW Leakage V = 0V, V = 0V or 6V, V = 6V ? 0.01 ? 2.5 m A LSW RUN SW IN V SYNC/MODE Threshold l 0.2 1.0 1.5 V SYNC/MODE I SYNC/MODE Leakage Current ? 0.01 ? 1 m A SYNC/MODE 1875f 2 U W U U WWWLTC1875 ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C. V = 3.6V unless otherwise noted. A IN SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V RUN Threshold V Ramping Up l 0.2 0.7 1.5 V RUN RUN I RUN Input Current V = 0V ? 0.01 ? 1 m A RUN RUN Note 1: Absolute Maximum Ratings are those values beyond which the life Note 4: The LTC1875 is tested in a feedback loop which servos V to the FB of a device may be impaired. balance point for the error amplifier (V = 1.2V) ITH Note 2: The LTC1875E is guaranteed to meet specified performance from Note 5: Dynamic supply current is higher due to the gate charge being 0 C to 70 C. Specifications over the ?40 C to 85 C operating temperature delivered at the switching frequency. range are assured by design, characterization and correlation with Note 6: This IC includes overtemperature protection that is intended to statistical process controls. protect the device during momentary overload conditions. Junction Note 3: T is calculated from the ambient temperature T and power temperature will exceed 125 C when overtemperature protection is active. J A dissipation P according to the following formula: Continuous operation above the specified maximum operating junction D temperature may impair device reliability. LTC1875: T = T + (P ? 110 C/W) J A D TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency Oscillator Frequency vs Supply Voltage R vs Temperature vs Temperature DS(ON) 0.8 595 580 V = 3.6V SYNCHRONOUS SWITCH IN MAIN SWITCH 0.7 V = 3V IN 575 570 0.6 0.5 V = 5V 555 IN 560 0.4 535 550 0.3 V = 3V V = 5V IN IN 0.2 515 540 0.1 0 495 530 ?50 ?25 0 25 50 75 100 125 ?50 ?25 0 25 50 75 100 125 0 2 4 68 TEMPERATURE (?C) TEMPERATURE (?C) SUPPLY VOLTAGE (V) 1875 G01 1875 G02 1875 G03 DC Supply Current Switch Leakage Current vs Temperature R vs Input Voltage vs Temperature DS(ON) 10 300 0.6 V = 3.6V V = 7V IN IN 9 RUN = 0V 250 0.5 8 SYNCHRONOUS SWITCH PULSE SKIPPING MODE 7 200 0.4 6 MAIN SWITCH 5 150 0.3 4 100 0.2 3 MAIN SWITCH 2 50 0.1 SYNCHRONOUS SWITCH 1 BURST MODE 0 0 0 ?50 0 50 100 125 02 4 6 8 ?50 0 50 100 125 TEMPERATURE (?C) TEMPERATURE (?C) INPUT VOLTAGE (V) 1875 G04 1875 G05 1875 G06 1875f 3 R (?) SUPPLY CURRENT (?A) DS(ON) R (?) FREQUENCY (kHz) DS(ON) SWITCH LEAKAGE (?A) OSC FREQUENCY (kHz) UWLTC1875 15m A Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTIO ? n High Efficiency: Up to 95% The LTC 1875 is a high efficiency 1.5A monolithic syn- n Low Quiescent Current: Only 15m A with No Load chronous buck regulator using a constant frequency, n 550kHz Constant Frequency Operation current mode architecture. Operating supply current is n 2.65V to 6V Input Voltage Range only 15m A with no load and drops to <1m A in shutdown. n V from 0.8V to V , I to 1.5A The input supply voltage range of 2.65V to 6V makes the OUT IN OUT n True PLL Frequency Locking from 350kHz to 750kHz LTC1875 ideally suited for single Li-Ion battery-powered n Power Good Output Voltage Monitor applications. 100% duty cycle provides low dropout op- n Low Dropout Operation: 100% Duty Cycle eration, extending battery life in portable systems. ? n Burst Mode or Pulse Skipping Operation The switching frequency is internally set to 550kHz, allow- n Current Mode Operation for Excellent Line and Load ing the use of small surface mount inductors and capaci- Transient Response tors. For noise sensitive applications, the LTC1875 can be n Shutdown Mode Draws <1m A Supply Current externally synchronized from 350kHz to 750kHz. Burst n ? 2% Output Voltage Accuracy Mode operation is inhibited during synchronization or n Overcurrent and Overtemperature Protected when the SYNC/MODE pin is pulled low. n Available in 16-Lead SSOP Package The internal synchronous switch increases efficiency and U eliminates the need for an external Schottky diode. Low APPLICATIO S output voltages are easily supported with a 0.8V feedback reference voltage. The LTC1875 is available in a 16-lead n Portable Computers SSOP package. n Portable Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. n Wireless Modems Burst Mode is a registered trademark of Linear Technology Corporation. TYPICAL APPLICATIO High Efficiency Step-Down Converter Efficiency vs Output Load Current V IN 2.65V TO 6V 100 C IN V = 3.6V 22?F IN 95 SV IN RUN/SS PV IN 90 L1 V = 4.2V 85 IN SYNC/MODE SWP 6.8?H V * OUT V = 6V IN LTC1875 80 3.3V PGOOD SWN + 75 C OUT 150k 47?F I PGND TH 70 88.7k 47pF 220pF 65 V FB Burst Mode OPERATION SGND 60 V = 3.3V 28.0k OUT L = 6.8?H 55 1875 TA01 0.1 1 10 100 1000 C : TAIYO YUDEN CERAMIC JMK325BJ226MM IN OUPUT CURRENT (mA) C : SANYO POSCAP 6TPA47M OUT 1875 TA01a L1: TOKO 646CY-6R8M *V CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.3V OUT IN IN 1875f 1 EFFICIENCY (%) U ULTC1875 15m A Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTIO ? n High Efficiency: Up to 95% The LTC 1875 is a high efficiency 1.5A monolithic syn- n Low Quiescent Current: Only 15m A with No Load chronous buck regulator using a constant frequency, n 550kHz Constant Frequency Operation current mode architecture. Operating supply current is n 2.65V to 6V Input Voltage Range only 15m A with no load and drops to <1m A in shutdown. n V from 0.8V to V , I to 1.5A The input supply voltage range of 2.65V to 6V makes the OUT IN OUT n True PLL Frequency Locking from 350kHz to 750kHz LTC1875 ideally suited for single Li-Ion battery-powered n Power Good Output Voltage Monitor applications. 100% duty cycle provides low dropout op- n Low Dropout Operation: 100% Duty Cycle eration, extending battery life in portable systems. ? n Burst Mode or Pulse Skipping Operation The switching frequency is internally set to 550kHz, allow- n Current Mode Operation for Excellent Line and Load ing the use of small surface mount inductors and capaci- Transient Response tors. For noise sensitive applications, the LTC1875 can be n Shutdown Mode Draws <1m A Supply Current externally synchronized from 350kHz to 750kHz. Burst n ? 2% Output Voltage Accuracy Mode operation is inhibited during synchronization or n Overcurrent and Overtemperature Protected when the SYNC/MODE pin is pulled low. n Available in 16-Lead SSOP Package The internal synchronous switch increases efficiency and U eliminates the need for an external Schottky diode. Low APPLICATIO S output voltages are easily supported with a 0.8V feedback reference voltage. The LTC1875 is available in a 16-lead n Portable Computers SSOP package. n Portable Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. n Wireless Modems Burst Mode is a registered trademark of Linear Technology Corporation. TYPICAL APPLICATIO High Efficiency Step-Down Converter Efficiency vs Output Load Current V IN 2.65V TO 6V 100 C IN V = 3.6V 22?F IN 95 SV IN RUN/SS PV IN 90 L1 V = 4.2V 85 IN SYNC/MODE SWP 6.8?H V * OUT V = 6V IN LTC1875 80 3.3V PGOOD SWN + 75 C OUT 150k 47?F I PGND TH 70 88.7k 47pF 220pF 65 V FB Burst Mode OPERATION SGND 60 V = 3.3V 28.0k OUT L = 6.8?H 55 1875 TA01 0.1 1 10 100 1000 C : TAIYO YUDEN CERAMIC JMK325BJ226MM IN OUPUT CURRENT (mA) C : SANYO POSCAP 6TPA47M OUT 1875 TA01a L1: TOKO 646CY-6R8M *V CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.3V OUT IN IN 1875f 1 EFFICIENCY (%) U ULTC1875 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) ORDER PART Input Supply Voltage .................................. ?0.3V to 7V TOP VIEW NUMBER I , PLL_LPF Voltages ............................. ?0.3V to 2.7V TH SGND 1 16 PLL_LPF RUN/SS, V Voltages ............................... ?0.3V to V FB IN RUN/SS 2 15 SYNC/MODE LTC1875EGN SYNC/MODE Voltage ................................. ?0.3V to V IN V 3 14 PGOOD FB (V ? V ) Voltage............................... ?0.3V to 7V PVIN SWP I 4 13 SV TH IN V Voltage .............................................. ?0.3V to 7V SWN SWP1 5 12 SWP2 P-Channel Switch Source Current (DC) .................... 2A SWN1 6 11 SWN2 GN PART N-Channel Switch Sink Current (DC) ........................ 2A PGND1 7 10 PGND2 MARKING Peak Switching Sink and Source Current ................. 3A PV 8 9 PV IN1 IN2 Operating Ambient Temperature Range 1875 GN PACKAGE 16-LEAD PLASTIC SSOP (Note 2) ............................................. ?40 C to 85 C T = 125 C, q = 110 C/ W, q = 40 C/ W JMAX JA JC Junction Temperature (Note 3, 6)........................ 125 C Storage Temperature Range ................ ? 65 C to 150 C Lead Temperature (Soldering, 10 sec)................. 300 C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C. V = 3.6V unless otherwise noted. A IN SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I Feedback Current (Note 4) l 860 nA VFB V Regulated Output Voltage (Note 4) 0 C ? T ? 85 C 0.784 0.80 0.816 V FB A (Note 4) ?40 C ? T ? 85 C l 0.740 0.80 0.840 V A D V Overvoltage Trip Limit with Respect to V D V = V ? V l 20 60 110 mV OVL FB OVL OVL FB D V Undervoltage Trip Limit with Respect to V D V = V ? V l 20 60 110 mV UVL FB UVL FB UVL D V /V Reference Voltage Line Regulation V = 2.65V to 6V (Note 4) 0.05 0.25 %/V FB FB IN V Output Voltage Load Regulation Measured in Servo Loop, V = 0.9V to 1.2V l 0.1 0.6 % LOADREG ITH Measured in Servo Loop, V = 1.6V to 1.2V l ?0.1 ?0.6 % ITH V Input Voltage Range l 2.65 6 V IN I Input DC Bias Current (Note 5) Q Pulse Skipping Mode 2.65V < V < 6V, V = 0V, I = 0A 270 365 m A IN SYNC/MODE OUT Burst Mode Operation V = V , I = 0A 15 22 m A SYNC/MODE IN OUT Shutdown V = 0V, V = 6V 0 1 m A RUN IN f SYNC Capture Range 350 750 kHz SYNC f Oscillator Frequency V ? 0.7V 495 550 605 kHz OSC FB = 0V 80 kHz V FB I Phase Detector Output Current PLLLPF Sinking Capability f < f l 3 10 20 m A PLLIN OSC Sourcing Capability f > f l ?3 ?10 ?20 m A PPLIN SOC R R of P-Channel FET I = 100mA, V = 5V 0.28 0.35 W PFET DS(ON) SW IN R R of N-Channel FET I = ? 100mA, V = 5V 0.35 0.4 W NFET DS(ON) SW IN I Peak Inductor Current V = 0.7V, Duty Cycle < 35%, V = 3V 1.6 2.15 2.75 A PK FB IN I SW Leakage V = 0V, V = 0V or 6V, V = 6V ? 0.01 ? 2.5 m A LSW RUN SW IN V SYNC/MODE Threshold l 0.2 1.0 1.5 V SYNC/MODE I SYNC/MODE Leakage Current ? 0.01 ? 1 m A SYNC/MODE 1875f 2 U W U U WWWLTC1875 15m A Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTIO ? n High Efficiency: Up to 95% The LTC 1875 is a high efficiency 1.5A monolithic syn- n Low Quiescent Current: Only 15m A with No Load chronous buck regulator using a constant frequency, n 550kHz Constant Frequency Operation current mode architecture. Operating supply current is n 2.65V to 6V Input Voltage Range only 15m A with no load and drops to <1m A in shutdown. n V from 0.8V to V , I to 1.5A The input supply voltage range of 2.65V to 6V makes the OUT IN OUT n True PLL Frequency Locking from 350kHz to 750kHz LTC1875 ideally suited for single Li-Ion battery-powered n Power Good Output Voltage Monitor applications. 100% duty cycle provides low dropout op- n Low Dropout Operation: 100% Duty Cycle eration, extending battery life in portable systems. ? n Burst Mode or Pulse Skipping Operation The switching frequency is internally set to 550kHz, allow- n Current Mode Operation for Excellent Line and Load ing the use of small surface mount inductors and capaci- Transient Response tors. For noise sensitive applications, the LTC1875 can be n Shutdown Mode Draws <1m A Supply Current externally synchronized from 350kHz to 750kHz. Burst n ? 2% Output Voltage Accuracy Mode operation is inhibited during synchronization or n Overcurrent and Overtemperature Protected when the SYNC/MODE pin is pulled low. n Available in 16-Lead SSOP Package The internal synchronous switch increases efficiency and U eliminates the need for an external Schottky diode. Low APPLICATIO S output voltages are easily supported with a 0.8V feedback reference voltage. The LTC1875 is available in a 16-lead n Portable Computers SSOP package. n Portable Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. n Wireless Modems Burst Mode is a registered trademark of Linear Technology Corporation. TYPICAL APPLICATIO High Efficiency Step-Down Converter Efficiency vs Output Load Current V IN 2.65V TO 6V 100 C IN V = 3.6V 22?F IN 95 SV IN RUN/SS PV IN 90 L1 V = 4.2V 85 IN SYNC/MODE SWP 6.8?H V * OUT V = 6V IN LTC1875 80 3.3V PGOOD SWN + 75 C OUT 150k 47?F I PGND TH 70 88.7k 47pF 220pF 65 V FB Burst Mode OPERATION SGND 60 V = 3.3V 28.0k OUT L = 6.8?H 55 1875 TA01 0.1 1 10 100 1000 C : TAIYO YUDEN CERAMIC JMK325BJ226MM IN OUPUT CURRENT (mA) C : SANYO POSCAP 6TPA47M OUT 1875 TA01a L1: TOKO 646CY-6R8M *V CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.3V OUT IN IN 1875f 1 EFFICIENCY (%) U ULTC1875 15m A Quiescent Current 1.5A Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTIO ? n High Efficiency: Up to 95% The LTC 1875 is a high efficiency 1.5A monolithic syn- n Low Quiescent Current: Only 15m A with No Load chronous buck regulator using a constant frequency, n 550kHz Constant Frequency Operation current mode architecture. Operating supply current is n 2.65V to 6V Input Voltage Range only 15m A with no load and drops to <1m A in shutdown. n V from 0.8V to V , I to 1.5A The input supply voltage range of 2.65V to 6V makes the OUT IN OUT n True PLL Frequency Locking from 350kHz to 750kHz LTC1875 ideally suited for single Li-Ion battery-powered n Power Good Output Voltage Monitor applications. 100% duty cycle provides low dropout op- n Low Dropout Operation: 100% Duty Cycle eration, extending battery life in portable systems. ? n Burst Mode or Pulse Skipping Operation The switching frequency is internally set to 550kHz, allow- n Current Mode Operation for Excellent Line and Load ing the use of small surface mount inductors and capaci- Transient Response tors. For noise sensitive applications, the LTC1875 can be n Shutdown Mode Draws <1m A Supply Current externally synchronized from 350kHz to 750kHz. Burst n ? 2% Output Voltage Accuracy Mode operation is inhibited during synchronization or n Overcurrent and Overtemperature Protected when the SYNC/MODE pin is pulled low. n Available in 16-Lead SSOP Package The internal synchronous switch increases efficiency and U eliminates the need for an external Schottky diode. Low APPLICATIO S output voltages are easily supported with a 0.8V feedback reference voltage. The LTC1875 is available in a 16-lead n Portable Computers SSOP package. n Portable Instruments , LTC and LT are registered trademarks of Linear Technology Corporation. n Wireless Modems Burst Mode is a registered trademark of Linear Technology Corporation. TYPICAL APPLICATIO High Efficiency Step-Down Converter Efficiency vs Output Load Current V IN 2.65V TO 6V 100 C IN V = 3.6V 22?F IN 95 SV IN RUN/SS PV IN 90 L1 V = 4.2V 85 IN SYNC/MODE SWP 6.8?H V * OUT V = 6V IN LTC1875 80 3.3V PGOOD SWN + 75 C OUT 150k 47?F I PGND TH 70 88.7k 47pF 220pF 65 V FB Burst Mode OPERATION SGND 60 V = 3.3V 28.0k OUT L = 6.8?H 55 1875 TA01 0.1 1 10 100 1000 C : TAIYO YUDEN CERAMIC JMK325BJ226MM IN OUPUT CURRENT (mA) C : SANYO POSCAP 6TPA47M OUT 1875 TA01a L1: TOKO 646CY-6R8M *V CONNECTED TO V (MINUS SWITCH AND L1 VOLTAGE DROP) FOR 2.65V < V < 3.3V OUT IN IN 1875f 1 EFFICIENCY (%) U ULTC1875 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) ORDER PART Input Supply Voltage .................................. ?0.3V to 7V TOP VIEW NUMBER I , PLL_LPF Voltages ............................. ?0.3V to 2.7V TH SGND 1 16 PLL_LPF RUN/SS, V Voltages ............................... ?0.3V to V FB IN RUN/SS 2 15 SYNC/MODE LTC1875EGN SYNC/MODE Voltage ................................. ?0.3V to V IN V 3 14 PGOOD FB (V ? V ) Voltage............................... ?0.3V to 7V PVIN SWP I 4 13 SV TH IN V Voltage .............................................. ?0.3V to 7V SWN SWP1 5 12 SWP2 P-Channel Switch Source Current (DC) .................... 2A SWN1 6 11 SWN2 GN PART N-Channel Switch Sink Current (DC) ........................ 2A PGND1 7 10 PGND2 MARKING Peak Switching Sink and Source Current ................. 3A PV 8 9 PV IN1 IN2 Operating Ambient Temperature Range 1875 GN PACKAGE 16-LEAD PLASTIC SSOP (Note 2) ............................................. ?40 C to 85 C T = 125 C, q = 110 C/ W, q = 40 C/ W JMAX JA JC Junction Temperature (Note 3, 6)........................ 125 C Storage Temperature Range ................ ? 65 C to 150 C Lead Temperature (Soldering, 10 sec)................. 300 C Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C. V = 3.6V unless otherwise noted. A IN SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I Feedback Current (Note 4) l 860 nA VFB V Regulated Output Voltage (Note 4) 0 C ? T ? 85 C 0.784 0.80 0.816 V FB A (Note 4) ?40 C ? T ? 85 C l 0.740 0.80 0.840 V A D V Overvoltage Trip Limit with Respect to V D V = V ? V l 20 60 110 mV OVL FB OVL OVL FB D V Undervoltage Trip Limit with Respect to V D V = V ? V l 20 60 110 mV UVL FB UVL FB UVL D V /V Reference Voltage Line Regulation V = 2.65V to 6V (Note 4) 0.05 0.25 %/V FB FB IN V Output Voltage Load Regulation Measured in Servo Loop, V = 0.9V to 1.2V l 0.1 0.6 % LOADREG ITH Measured in Servo Loop, V = 1.6V to 1.2V l ?0.1 ?0.6 % ITH V Input Voltage Range l 2.65 6 V IN I Input DC Bias Current (Note 5) Q Pulse Skipping Mode 2.65V < V < 6V, V = 0V, I = 0A 270 365 m A IN SYNC/MODE OUT Burst Mode Operation V = V , I = 0A 15 22 m A SYNC/MODE IN OUT Shutdown V = 0V, V = 6V 0 1 m A RUN IN f SYNC Capture Range 350 750 kHz SYNC f Oscillator Frequency V ? 0.7V 495 550 605 kHz OSC FB = 0V 80 kHz V FB I Phase Detector Output Current PLLLPF Sinking Capability f < f l 3 10 20 m A PLLIN OSC Sourcing Capability f > f l ?3 ?10 ?20 m A PPLIN SOC R R of P-Channel FET I = 100mA, V = 5V 0.28 0.35 W PFET DS(ON) SW IN R R of N-Channel FET I = ? 100mA, V = 5V 0.35 0.4 W NFET DS(ON) SW IN I Peak Inductor Current V = 0.7V, Duty Cycle < 35%, V = 3V 1.6 2.15 2.75 A PK FB IN I SW Leakage V = 0V, V = 0V or 6V, V = 6V ? 0.01 ? 2.5 m A LSW RUN SW IN V SYNC/MODE Threshold l 0.2 1.0 1.5 V SYNC/MODE I SYNC/MODE Leakage Current ? 0.01 ? 1 m A SYNC/MODE 1875f 2 U W U U WWWLTC1875 ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C. V = 3.6V unless otherwise noted. A IN SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V RUN Threshold V Ramping Up l 0.2 0.7 1.5 V RUN RUN I RUN Input Current V = 0V ? 0.01 ? 1 m A RUN RUN Note 1: Absolute Maximum Ratings are those values beyond which the life Note 4: The LTC1875 is tested in a feedback loop which servos V to the FB of a device may be impaired. balance point for the error amplifier (V = 1.2V) ITH Note 2: The LTC1875E is guaranteed to meet specified performance from Note 5: Dynamic supply current is higher due to the gate charge being 0 C to 70 C. Specifications over the ?40 C to 85 C operating temperature delivered at the switching frequency. range are assured by design, characterization and correlation with Note 6: This IC includes overtemperature protection that is intended to statistical process controls. protect the device during momentary overload conditions. Junction Note 3: T is calculated from the ambient temperature T and power temperature will exceed 125 C when overtemperature protection is active. J A dissipation P according to the following formula: Continuous operation above the specified maximum operating junction D temperature may impair device reliability. LTC1875: T = T + (P ? 110 C/W) J A D TYPICAL PERFOR A CE CHARACTERISTICS Oscillator Frequency Oscillator Frequency vs Supply Voltage R vs Temperature vs Temperature DS(ON) 0.8 595 580 V = 3.6V SYNCHRONOUS SWITCH IN MAIN SWITCH 0.7 V = 3V IN 575 570 0.6 0.5 V = 5V 555 IN 560 0.4 535 550 0.3 V = 3V V = 5V IN IN 0.2 515 540 0.1 0 495 530 ?50 ?25 0 25 50 75 100 125 ?50 ?25 0 25 50 75 100 125 0 2 4 68 TEMPERATURE (?C) TEMPERATURE (?C) SUPPLY VOLTAGE (V) 1875 G01 1875 G02 1875 G03 DC Supply Current Switch Leakage Current vs Temperature R vs Input Voltage vs Temperature DS(ON) 10 300 0.6 V = 3.6V V = 7V IN IN 9 RUN = 0V 250 0.5 8 SYNCHRONOUS SWITCH PULSE SKIPPING MODE 7 200 0.4 6 MAIN SWITCH 5 150 0.3 4 100 0.2 3 MAIN SWITCH 2 50 0.1 SYNCHRONOUS SWITCH 1 BURST MODE 0 0 0 ?50 0 50 100 125 02 4 6 8 ?50 0 50 100 125 TEMPERATURE (?C) TEMPERATURE (?C) INPUT VOLTAGE (V) 1875 G04 1875 G05 1875 G06 1875f 3 R (O) SUPPLY CURRENT (?A) DS(ON) R (O) FREQUENCY (kHz) DS(ON) SWITCH LEAKAGE (?A) OSC FREQUENCY (kHz) UW

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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