LTC3646HDE-1#PBF

POWER LOSS (W) LTC3646/LTC3646-1 40V, 1A Synchronous Step-Down Converter FEATURES DESCRIPTION ? n Wide Input Voltage Range: 4.0V to 40V The LTC 3646 is a high efficiency, step-down DC/DC n 1A Guaranteed Output Current converter with internal high side and synchronous power n High Efficiency: Up to 95% FETs. It draws only 140?A typical DC supply current in n Wide Output Voltage Range Burst Mode operation at no load while maintaining output n LTC3646: 2.0V to 30V voltage regulation. n LTC3646-1: 0.6V to 15V The LTC3646 can supply up to a 1A load, and its combina- n ?1% Accurate Reference Voltage tion of Burst Mode operation, integrated power switches n Internal or External Compensation and low quiescent current provides high efficiency over a n Switching Frequency Adjustable and Synchronizable: broad range of load currents. Alternatively, it can be used 200kHz to 3MHz in forced continuous mode for ripple sensitive applications. ? n Selectable High Efficiency Burst Mode Operation or The LTC3646 has a wide 4.0V to 40V input range and its Forced Continuous Mode n patented controlled on-time architecture and 0.6V refer- 14 Lead 3mm ? 4mm DFN or Thermally Enhanced ence voltage allow for large step-down ratios without 16-Lead MSOP Packages the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or APPLICATIONS synchronized to an external clock. n Point of Load Power Supplies The internal soft-start, short-circuit protection and volt- n Intermediate Bus Power age rating make the LTC3646 a robust part ideal for high n Automotive Applications voltage applications. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 5847554, 6476589, 6774611. TYPICAL APPLICATION Efficiency Curve 100 1.0 V IN BOOST PVIN V = 12V IN V = 5V 40V MAX OUT 90 f = 1MHz SVIN 0.1?F LTC3646 V = 3.3V OUT 80 0.8 RUN 3.3?H V OUT SW INTV 70 CC 5V 10?F MODE/SYNC 1A 60 0.6 ITH 50 V RT SWITCH ON 40 0.4 CONTROL EXTV CC 30 V = 5V OUT 412k 4.7?F V = 3.3V 20 OUT 0.2 + 15?F ? V FB 10 0.6V 0 0 SGND PGND 0.001 0.01 0.1 1 56.2k LOAD CURRENT (A) 3646 TA01a 3646 TA01b 36461fc 1 For more information www.linear.com/LTC3646 EFFICIENCY (%)POWER LOSS (W) LTC3646/LTC3646-1 40V, 1A Synchronous Step-Down Converter FEATURES DESCRIPTION ? n Wide Input Voltage Range: 4.0V to 40V The LTC 3646 is a high efficiency, step-down DC/DC n 1A Guaranteed Output Current converter with internal high side and synchronous power n High Efficiency: Up to 95% FETs. It draws only 140?A typical DC supply current in n Wide Output Voltage Range Burst Mode operation at no load while maintaining output n LTC3646: 2.0V to 30V voltage regulation. n LTC3646-1: 0.6V to 15V The LTC3646 can supply up to a 1A load, and its combina- n ?1% Accurate Reference Voltage tion of Burst Mode operation, integrated power switches n Internal or External Compensation and low quiescent current provides high efficiency over a n Switching Frequency Adjustable and Synchronizable: broad range of load currents. Alternatively, it can be used 200kHz to 3MHz in forced continuous mode for ripple sensitive applications. ? n Selectable High Efficiency Burst Mode Operation or The LTC3646 has a wide 4.0V to 40V input range and its Forced Continuous Mode n patented controlled on-time architecture and 0.6V refer- 14 Lead 3mm ? 4mm DFN or Thermally Enhanced ence voltage allow for large step-down ratios without 16-Lead MSOP Packages the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or APPLICATIONS synchronized to an external clock. n Point of Load Power Supplies The internal soft-start, short-circuit protection and volt- n Intermediate Bus Power age rating make the LTC3646 a robust part ideal for high n Automotive Applications voltage applications. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 5847554, 6476589, 6774611. TYPICAL APPLICATION Efficiency Curve 100 1.0 V IN BOOST PVIN V = 12V IN V = 5V 40V MAX OUT 90 f = 1MHz SVIN 0.1?F LTC3646 V = 3.3V OUT 80 0.8 RUN 3.3?H V OUT SW INTV 70 CC 5V 10?F MODE/SYNC 1A 60 0.6 ITH 50 V RT SWITCH ON 40 0.4 CONTROL EXTV CC 30 V = 5V OUT 412k 4.7?F V = 3.3V 20 OUT 0.2 + 15?F ? V FB 10 0.6V 0 0 SGND PGND 0.001 0.01 0.1 1 56.2k LOAD CURRENT (A) 3646 TA01a 3646 TA01b 36461fc 1 For more information www.linear.com/LTC3646 EFFICIENCY (%)LTC3646/LTC3646-1 ABSOLUTE MAXIMUM RATINGS (Notes 1, 7) PVIN, SVIN Supply Voltage ........................ ?0.3V to 45V EXTV Voltage ........................................... ?0.3V to 6V CC SW Voltage (DC) ........................... ?0.3V to PVIN + 0.3V RUN Voltage............................................... ?0.3V to 45V BOOST ? SW Voltage ................................... ?0.3V to 6V PGOOD .......................................?0.3V to INTV + 0.3V CC V Voltage ................................................ ?0.3V to 33V Operating Junction Temperature Range ON MODE/SYNC, RT, ITH, (Notes 2, 7) ............................................ ?40?C to 150?C V Voltage ................................?0.3V to INTV + 0.3V Storage Temperature Range .................. ?65?C to 150?C FB CC INTV Voltage ............................................ ?0.3V to 6V Lead Temperature (Soldering, 10 sec) MSE ..........300?C CC PIN CONFIGURATION TOP VIEW TOP VIEW SGND 1 14 SVIN SGND 1 16 SVIN V 2 13 RUN FB V 2 15 RUN FB ITH 3 12 EXTV ITH 3 14 EXTV CC CC 15 17 RT 4 13 INTV CC RT 4 11 INTV PGND CC V 5 PGND 12 BOOST ON V 5 10 BOOST PGOOD 6 11 SW ON MODE/SYNC 7 10 PVIN PGOOD 6 9 SW NC 8 9 PVIN MODE/SYNC 7 8 PVIN MSE PACKAGE 16-LEAD PLASTIC MSOP DE PACKAGE T = 150?C, ? = 38?C/W JMAX JA 14-LEAD (4mm ? 3mm) PLASTIC DFN EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB T = 150?C, ? = 43?C/W JMAX JA EXPOSED PAD (PIN 15) IS PGND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3646EDE#PBF LTC3646EDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 85?C LTC3646IDE#PBF LTC3646IDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 125?C LTC3646HDE#PBF LTC3646HDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 150?C LTC3646EMSE#PBF LTC3646EMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 85?C LTC3646IMSE#PBF LTC3646IMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 125?C LTC3646HMSE#PBF LTC3646HMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 150?C LTC3646EDE-1#PBF LTC3646EDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 85?C LTC3646IDE-1#PBF LTC3646IDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 125?C LTC3646HDE-1#PBF LTC3646HDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 150?C LTC3646EMSE-1#PBF LTC3646EMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 85?C LTC3646IMSE-1#PBF LTC3646IMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 125?C LTC3646HMSE-1#PBF LTC3646HMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 150?C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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/ 36461fc 2 For more information www.linear.com/LTC3646POWER LOSS (W) LTC3646/LTC3646-1 40V, 1A Synchronous Step-Down Converter FEATURES DESCRIPTION ? n Wide Input Voltage Range: 4.0V to 40V The LTC 3646 is a high efficiency, step-down DC/DC n 1A Guaranteed Output Current converter with internal high side and synchronous power n High Efficiency: Up to 95% FETs. It draws only 140?A typical DC supply current in n Wide Output Voltage Range Burst Mode operation at no load while maintaining output n LTC3646: 2.0V to 30V voltage regulation. n LTC3646-1: 0.6V to 15V The LTC3646 can supply up to a 1A load, and its combina- n ?1% Accurate Reference Voltage tion of Burst Mode operation, integrated power switches n Internal or External Compensation and low quiescent current provides high efficiency over a n Switching Frequency Adjustable and Synchronizable: broad range of load currents. Alternatively, it can be used 200kHz to 3MHz in forced continuous mode for ripple sensitive applications. ? n Selectable High Efficiency Burst Mode Operation or The LTC3646 has a wide 4.0V to 40V input range and its Forced Continuous Mode n patented controlled on-time architecture and 0.6V refer- 14 Lead 3mm ? 4mm DFN or Thermally Enhanced ence voltage allow for large step-down ratios without 16-Lead MSOP Packages the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or APPLICATIONS synchronized to an external clock. n Point of Load Power Supplies The internal soft-start, short-circuit protection and volt- n Intermediate Bus Power age rating make the LTC3646 a robust part ideal for high n Automotive Applications voltage applications. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 5847554, 6476589, 6774611. TYPICAL APPLICATION Efficiency Curve 100 1.0 V IN BOOST PVIN V = 12V IN V = 5V 40V MAX OUT 90 f = 1MHz SVIN 0.1?F LTC3646 V = 3.3V OUT 80 0.8 RUN 3.3?H V OUT SW INTV 70 CC 5V 10?F MODE/SYNC 1A 60 0.6 ITH 50 V RT SWITCH ON 40 0.4 CONTROL EXTV CC 30 V = 5V OUT 412k 4.7?F V = 3.3V 20 OUT 0.2 + 15?F ? V FB 10 0.6V 0 0 SGND PGND 0.001 0.01 0.1 1 56.2k LOAD CURRENT (A) 3646 TA01a 3646 TA01b 36461fc 1 For more information www.linear.com/LTC3646 EFFICIENCY (%)POWER LOSS (W) LTC3646/LTC3646-1 40V, 1A Synchronous Step-Down Converter FEATURES DESCRIPTION ? n Wide Input Voltage Range: 4.0V to 40V The LTC 3646 is a high efficiency, step-down DC/DC n 1A Guaranteed Output Current converter with internal high side and synchronous power n High Efficiency: Up to 95% FETs. It draws only 140?A typical DC supply current in n Wide Output Voltage Range Burst Mode operation at no load while maintaining output n LTC3646: 2.0V to 30V voltage regulation. n LTC3646-1: 0.6V to 15V The LTC3646 can supply up to a 1A load, and its combina- n ?1% Accurate Reference Voltage tion of Burst Mode operation, integrated power switches n Internal or External Compensation and low quiescent current provides high efficiency over a n Switching Frequency Adjustable and Synchronizable: broad range of load currents. Alternatively, it can be used 200kHz to 3MHz in forced continuous mode for ripple sensitive applications. ? n Selectable High Efficiency Burst Mode Operation or The LTC3646 has a wide 4.0V to 40V input range and its Forced Continuous Mode n patented controlled on-time architecture and 0.6V refer- 14 Lead 3mm ? 4mm DFN or Thermally Enhanced ence voltage allow for large step-down ratios without 16-Lead MSOP Packages the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or APPLICATIONS synchronized to an external clock. n Point of Load Power Supplies The internal soft-start, short-circuit protection and volt- n Intermediate Bus Power age rating make the LTC3646 a robust part ideal for high n Automotive Applications voltage applications. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 5847554, 6476589, 6774611. TYPICAL APPLICATION Efficiency Curve 100 1.0 V IN BOOST PVIN V = 12V IN V = 5V 40V MAX OUT 90 f = 1MHz SVIN 0.1?F LTC3646 V = 3.3V OUT 80 0.8 RUN 3.3?H V OUT SW INTV 70 CC 5V 10?F MODE/SYNC 1A 60 0.6 ITH 50 V RT SWITCH ON 40 0.4 CONTROL EXTV CC 30 V = 5V OUT 412k 4.7?F V = 3.3V 20 OUT 0.2 + 15?F ? V FB 10 0.6V 0 0 SGND PGND 0.001 0.01 0.1 1 56.2k LOAD CURRENT (A) 3646 TA01a 3646 TA01b 36461fc 1 For more information www.linear.com/LTC3646 EFFICIENCY (%)LTC3646/LTC3646-1 ABSOLUTE MAXIMUM RATINGS (Notes 1, 7) PVIN, SVIN Supply Voltage ........................ ?0.3V to 45V EXTV Voltage ........................................... ?0.3V to 6V CC SW Voltage (DC) ........................... ?0.3V to PVIN + 0.3V RUN Voltage............................................... ?0.3V to 45V BOOST ? SW Voltage ................................... ?0.3V to 6V PGOOD .......................................?0.3V to INTV + 0.3V CC V Voltage ................................................ ?0.3V to 33V Operating Junction Temperature Range ON MODE/SYNC, RT, ITH, (Notes 2, 7) ............................................ ?40?C to 150?C V Voltage ................................?0.3V to INTV + 0.3V Storage Temperature Range .................. ?65?C to 150?C FB CC INTV Voltage ............................................ ?0.3V to 6V Lead Temperature (Soldering, 10 sec) MSE ..........300?C CC PIN CONFIGURATION TOP VIEW TOP VIEW SGND 1 14 SVIN SGND 1 16 SVIN V 2 13 RUN FB V 2 15 RUN FB ITH 3 12 EXTV ITH 3 14 EXTV CC CC 15 17 RT 4 13 INTV CC RT 4 11 INTV PGND CC V 5 PGND 12 BOOST ON V 5 10 BOOST PGOOD 6 11 SW ON MODE/SYNC 7 10 PVIN PGOOD 6 9 SW NC 8 9 PVIN MODE/SYNC 7 8 PVIN MSE PACKAGE 16-LEAD PLASTIC MSOP DE PACKAGE T = 150?C, ? = 38?C/W JMAX JA 14-LEAD (4mm ? 3mm) PLASTIC DFN EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB T = 150?C, ? = 43?C/W JMAX JA EXPOSED PAD (PIN 15) IS PGND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3646EDE#PBF LTC3646EDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 85?C LTC3646IDE#PBF LTC3646IDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 125?C LTC3646HDE#PBF LTC3646HDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 150?C LTC3646EMSE#PBF LTC3646EMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 85?C LTC3646IMSE#PBF LTC3646IMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 125?C LTC3646HMSE#PBF LTC3646HMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 150?C LTC3646EDE-1#PBF LTC3646EDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 85?C LTC3646IDE-1#PBF LTC3646IDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 125?C LTC3646HDE-1#PBF LTC3646HDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 150?C LTC3646EMSE-1#PBF LTC3646EMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 85?C LTC3646IMSE-1#PBF LTC3646IMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 125?C LTC3646HMSE-1#PBF LTC3646HMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 150?C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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/ 36461fc 2 For more information www.linear.com/LTC3646LTC3646/LTC3646-1 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at T = 25?C (Note 2), PVIN = SVIN = 12V unless otherwise noted. A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply (PVIN, SVIN) l V Input Voltage Operating Range 4.0 40 V IN V Input Supply Overvoltage Lockout V Rising l 43.5 46 V IN(OV) IN Hysteresis (V Falling) l 2.0 2.5 2.9 V IN V Input Supply Undervoltage Lockout V Falling 3.2 3.35 3.5 V IN(UV) IN Hysteresis (V Rising) 250 mV IN I DC Supply Current (Note 3) Q Forced Continuous 620 875 ?A Sleep Mode 140 190 ?A Shutdown Mode V = 0V 8 ?A RUN Main Control Loop V Output Voltage Range (Note 4) LTC3646 2.0 30 V OUT LTC3646-1 0.6 15 V V Feedback Reference Voltage ?40?C < T < 85?C 0.594 0.6 0.606 V FB A l 0.591 0.6 0.609 V Feedback Voltage Line Regulation V = 4.0V to 40V, I = 1.5V 0.05 %/V IN TH Feedback Voltage Load Regulation I = 1.0V to 1.8V 0.12 % TH l Feedback Input Current V = 0.6V 0 ?20 nA FB g Error Amplifier Transconductance External Comp 300 ?S m(EA) t Minimum On-Time V = 40V, R = 30k, V = 2V 30 ns ON(MIN) IN RT ON t Minimum Off-Time 80 ns OFF(MIN) l I Valley Switch Current Limit 0.9 1.2 1.5 A LIM Negative Valley Switch Current Limit ?0.3 A Internal Oscillator Frequency V = V 1.6 2.25 2.95 MHz RT INTVCC R = 450k? 0.19 0.2 0.27 MHz RT R = 60k? 1.25 1.5 1.75 MHz RT R = 30k? 2.55 3.0 3.45 MHz RT External Clock Frequency Range 0.2 3.0 MHz R Top Switch On-Resistance (Note 5) V = 5.5V 200 m ? DS(ON) IN Bottom Switch On-Resistance (Note 5) V = 5.5V 120 m? IN Switch Leakage V = V = 40V, V = 0V ?1 ?A IN SW RUN V = 40V, V = 0V, V = 0V ?1 ?A IN SW RUN Internal V Regulator CC l V INTV Voltage I = 5mA 4.8 5.0 5.2 V INTVCC CC INTVCC INTV Load Regulation (Note 6) I = 0mA to 5mA 0.5 % CC INTVCC INTV Undervoltage Lockout INTV Falling 3.0 V CC CC INTV UVLO Hysteresis 0.3 V CC EXTV Switchover Voltage EXTV Rising 4.25 4.5 4.65 V CC CC EXTV Hysteresis 200 mV CC Operation V RUN Pin Threshold RUN Rising 1.17 1.21 1.26 V RUN RUN Falling 1.06 1.10 1.14 V Hysteresis 110 mV RUN Pin Leakage Current RUN = 1.3V 0 ?1 ?A V PGOOD Overvoltage Threshold FB Rising 5.0 7.5 10 %V PGOOD(UT) FB FB Falling 3.5 5 %V FB V PGOOD Undervoltage Threshold FB Falling ?5.0 ?7.5 ?10 %V PGOOD(LT) FB FB Rising ?3.5 ?5 %V FB 36461fc 3 For more information www.linear.com/LTC3646POWER LOSS (W) LTC3646/LTC3646-1 40V, 1A Synchronous Step-Down Converter FEATURES DESCRIPTION ? n Wide Input Voltage Range: 4.0V to 40V The LTC 3646 is a high efficiency, step-down DC/DC n 1A Guaranteed Output Current converter with internal high side and synchronous power n High Efficiency: Up to 95% FETs. It draws only 140?A typical DC supply current in n Wide Output Voltage Range Burst Mode operation at no load while maintaining output n LTC3646: 2.0V to 30V voltage regulation. n LTC3646-1: 0.6V to 15V The LTC3646 can supply up to a 1A load, and its combina- n ?1% Accurate Reference Voltage tion of Burst Mode operation, integrated power switches n Internal or External Compensation and low quiescent current provides high efficiency over a n Switching Frequency Adjustable and Synchronizable: broad range of load currents. Alternatively, it can be used 200kHz to 3MHz in forced continuous mode for ripple sensitive applications. ? n Selectable High Efficiency Burst Mode Operation or The LTC3646 has a wide 4.0V to 40V input range and its Forced Continuous Mode n patented controlled on-time architecture and 0.6V refer- 14 Lead 3mm ? 4mm DFN or Thermally Enhanced ence voltage allow for large step-down ratios without 16-Lead MSOP Packages the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or APPLICATIONS synchronized to an external clock. n Point of Load Power Supplies The internal soft-start, short-circuit protection and volt- n Intermediate Bus Power age rating make the LTC3646 a robust part ideal for high n Automotive Applications voltage applications. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 5847554, 6476589, 6774611. TYPICAL APPLICATION Efficiency Curve 100 1.0 V IN BOOST PVIN V = 12V IN V = 5V 40V MAX OUT 90 f = 1MHz SVIN 0.1?F LTC3646 V = 3.3V OUT 80 0.8 RUN 3.3?H V OUT SW INTV 70 CC 5V 10?F MODE/SYNC 1A 60 0.6 ITH 50 V RT SWITCH ON 40 0.4 CONTROL EXTV CC 30 V = 5V OUT 412k 4.7?F V = 3.3V 20 OUT 0.2 + 15?F ? V FB 10 0.6V 0 0 SGND PGND 0.001 0.01 0.1 1 56.2k LOAD CURRENT (A) 3646 TA01a 3646 TA01b 36461fc 1 For more information www.linear.com/LTC3646 EFFICIENCY (%)POWER LOSS (W) LTC3646/LTC3646-1 40V, 1A Synchronous Step-Down Converter FEATURES DESCRIPTION ? n Wide Input Voltage Range: 4.0V to 40V The LTC 3646 is a high efficiency, step-down DC/DC n 1A Guaranteed Output Current converter with internal high side and synchronous power n High Efficiency: Up to 95% FETs. It draws only 140?A typical DC supply current in n Wide Output Voltage Range Burst Mode operation at no load while maintaining output n LTC3646: 2.0V to 30V voltage regulation. n LTC3646-1: 0.6V to 15V The LTC3646 can supply up to a 1A load, and its combina- n ?1% Accurate Reference Voltage tion of Burst Mode operation, integrated power switches n Internal or External Compensation and low quiescent current provides high efficiency over a n Switching Frequency Adjustable and Synchronizable: broad range of load currents. Alternatively, it can be used 200kHz to 3MHz in forced continuous mode for ripple sensitive applications. ? n Selectable High Efficiency Burst Mode Operation or The LTC3646 has a wide 4.0V to 40V input range and its Forced Continuous Mode n patented controlled on-time architecture and 0.6V refer- 14 Lead 3mm ? 4mm DFN or Thermally Enhanced ence voltage allow for large step-down ratios without 16-Lead MSOP Packages the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or APPLICATIONS synchronized to an external clock. n Point of Load Power Supplies The internal soft-start, short-circuit protection and volt- n Intermediate Bus Power age rating make the LTC3646 a robust part ideal for high n Automotive Applications voltage applications. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 5847554, 6476589, 6774611. TYPICAL APPLICATION Efficiency Curve 100 1.0 V IN BOOST PVIN V = 12V IN V = 5V 40V MAX OUT 90 f = 1MHz SVIN 0.1?F LTC3646 V = 3.3V OUT 80 0.8 RUN 3.3?H V OUT SW INTV 70 CC 5V 10?F MODE/SYNC 1A 60 0.6 ITH 50 V RT SWITCH ON 40 0.4 CONTROL EXTV CC 30 V = 5V OUT 412k 4.7?F V = 3.3V 20 OUT 0.2 + 15?F ? V FB 10 0.6V 0 0 SGND PGND 0.001 0.01 0.1 1 56.2k LOAD CURRENT (A) 3646 TA01a 3646 TA01b 36461fc 1 For more information www.linear.com/LTC3646 EFFICIENCY (%)LTC3646/LTC3646-1 ABSOLUTE MAXIMUM RATINGS (Notes 1, 7) PVIN, SVIN Supply Voltage ........................ ?0.3V to 45V EXTV Voltage ........................................... ?0.3V to 6V CC SW Voltage (DC) ........................... ?0.3V to PVIN + 0.3V RUN Voltage............................................... ?0.3V to 45V BOOST ? SW Voltage ................................... ?0.3V to 6V PGOOD .......................................?0.3V to INTV + 0.3V CC V Voltage ................................................ ?0.3V to 33V Operating Junction Temperature Range ON MODE/SYNC, RT, ITH, (Notes 2, 7) ............................................ ?40?C to 150?C V Voltage ................................?0.3V to INTV + 0.3V Storage Temperature Range .................. ?65?C to 150?C FB CC INTV Voltage ............................................ ?0.3V to 6V Lead Temperature (Soldering, 10 sec) MSE ..........300?C CC PIN CONFIGURATION TOP VIEW TOP VIEW SGND 1 14 SVIN SGND 1 16 SVIN V 2 13 RUN FB V 2 15 RUN FB ITH 3 12 EXTV ITH 3 14 EXTV CC CC 15 17 RT 4 13 INTV CC RT 4 11 INTV PGND CC V 5 PGND 12 BOOST ON V 5 10 BOOST PGOOD 6 11 SW ON MODE/SYNC 7 10 PVIN PGOOD 6 9 SW NC 8 9 PVIN MODE/SYNC 7 8 PVIN MSE PACKAGE 16-LEAD PLASTIC MSOP DE PACKAGE T = 150?C, ? = 38?C/W JMAX JA 14-LEAD (4mm ? 3mm) PLASTIC DFN EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB T = 150?C, ? = 43?C/W JMAX JA EXPOSED PAD (PIN 15) IS PGND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3646EDE#PBF LTC3646EDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 85?C LTC3646IDE#PBF LTC3646IDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 125?C LTC3646HDE#PBF LTC3646HDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 150?C LTC3646EMSE#PBF LTC3646EMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 85?C LTC3646IMSE#PBF LTC3646IMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 125?C LTC3646HMSE#PBF LTC3646HMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 150?C LTC3646EDE-1#PBF LTC3646EDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 85?C LTC3646IDE-1#PBF LTC3646IDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 125?C LTC3646HDE-1#PBF LTC3646HDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 150?C LTC3646EMSE-1#PBF LTC3646EMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 85?C LTC3646IMSE-1#PBF LTC3646IMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 125?C LTC3646HMSE-1#PBF LTC3646HMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 150?C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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/ 36461fc 2 For more information www.linear.com/LTC3646POWER LOSS (W) LTC3646/LTC3646-1 40V, 1A Synchronous Step-Down Converter FEATURES DESCRIPTION ? n Wide Input Voltage Range: 4.0V to 40V The LTC 3646 is a high efficiency, step-down DC/DC n 1A Guaranteed Output Current converter with internal high side and synchronous power n High Efficiency: Up to 95% FETs. It draws only 140?A typical DC supply current in n Wide Output Voltage Range Burst Mode operation at no load while maintaining output n LTC3646: 2.0V to 30V voltage regulation. n LTC3646-1: 0.6V to 15V The LTC3646 can supply up to a 1A load, and its combina- n ?1% Accurate Reference Voltage tion of Burst Mode operation, integrated power switches n Internal or External Compensation and low quiescent current provides high efficiency over a n Switching Frequency Adjustable and Synchronizable: broad range of load currents. Alternatively, it can be used 200kHz to 3MHz in forced continuous mode for ripple sensitive applications. ? n Selectable High Efficiency Burst Mode Operation or The LTC3646 has a wide 4.0V to 40V input range and its Forced Continuous Mode n patented controlled on-time architecture and 0.6V refer- 14 Lead 3mm ? 4mm DFN or Thermally Enhanced ence voltage allow for large step-down ratios without 16-Lead MSOP Packages the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or APPLICATIONS synchronized to an external clock. n Point of Load Power Supplies The internal soft-start, short-circuit protection and volt- n Intermediate Bus Power age rating make the LTC3646 a robust part ideal for high n Automotive Applications voltage applications. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 5847554, 6476589, 6774611. TYPICAL APPLICATION Efficiency Curve 100 1.0 V IN BOOST PVIN V = 12V IN V = 5V 40V MAX OUT 90 f = 1MHz SVIN 0.1?F LTC3646 V = 3.3V OUT 80 0.8 RUN 3.3?H V OUT SW INTV 70 CC 5V 10?F MODE/SYNC 1A 60 0.6 ITH 50 V RT SWITCH ON 40 0.4 CONTROL EXTV CC 30 V = 5V OUT 412k 4.7?F V = 3.3V 20 OUT 0.2 + 15?F ? V FB 10 0.6V 0 0 SGND PGND 0.001 0.01 0.1 1 56.2k LOAD CURRENT (A) 3646 TA01a 3646 TA01b 36461fc 1 For more information www.linear.com/LTC3646 EFFICIENCY (%)POWER LOSS (W) LTC3646/LTC3646-1 40V, 1A Synchronous Step-Down Converter FEATURES DESCRIPTION ? n Wide Input Voltage Range: 4.0V to 40V The LTC 3646 is a high efficiency, step-down DC/DC n 1A Guaranteed Output Current converter with internal high side and synchronous power n High Efficiency: Up to 95% FETs. It draws only 140?A typical DC supply current in n Wide Output Voltage Range Burst Mode operation at no load while maintaining output n LTC3646: 2.0V to 30V voltage regulation. n LTC3646-1: 0.6V to 15V The LTC3646 can supply up to a 1A load, and its combina- n ?1% Accurate Reference Voltage tion of Burst Mode operation, integrated power switches n Internal or External Compensation and low quiescent current provides high efficiency over a n Switching Frequency Adjustable and Synchronizable: broad range of load currents. Alternatively, it can be used 200kHz to 3MHz in forced continuous mode for ripple sensitive applications. ? n Selectable High Efficiency Burst Mode Operation or The LTC3646 has a wide 4.0V to 40V input range and its Forced Continuous Mode n patented controlled on-time architecture and 0.6V refer- 14 Lead 3mm ? 4mm DFN or Thermally Enhanced ence voltage allow for large step-down ratios without 16-Lead MSOP Packages the risk of output overvoltage. The frequency may be set between 200kHz and 3.0MHz with a program resistor or APPLICATIONS synchronized to an external clock. n Point of Load Power Supplies The internal soft-start, short-circuit protection and volt- n Intermediate Bus Power age rating make the LTC3646 a robust part ideal for high n Automotive Applications voltage applications. L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and Hot Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 6580258, 5481178, 5994885, 6304066, 5847554, 6476589, 6774611. TYPICAL APPLICATION Efficiency Curve 100 1.0 V IN BOOST PVIN V = 12V IN V = 5V 40V MAX OUT 90 f = 1MHz SVIN 0.1?F LTC3646 V = 3.3V OUT 80 0.8 RUN 3.3?H V OUT SW INTV 70 CC 5V 10?F MODE/SYNC 1A 60 0.6 ITH 50 V RT SWITCH ON 40 0.4 CONTROL EXTV CC 30 V = 5V OUT 412k 4.7?F V = 3.3V 20 OUT 0.2 + 15?F ? V FB 10 0.6V 0 0 SGND PGND 0.001 0.01 0.1 1 56.2k LOAD CURRENT (A) 3646 TA01a 3646 TA01b 36461fc 1 For more information www.linear.com/LTC3646 EFFICIENCY (%)LTC3646/LTC3646-1 ABSOLUTE MAXIMUM RATINGS (Notes 1, 7) PVIN, SVIN Supply Voltage ........................ ?0.3V to 45V EXTV Voltage ........................................... ?0.3V to 6V CC SW Voltage (DC) ........................... ?0.3V to PVIN + 0.3V RUN Voltage............................................... ?0.3V to 45V BOOST ? SW Voltage ................................... ?0.3V to 6V PGOOD .......................................?0.3V to INTV + 0.3V CC V Voltage ................................................ ?0.3V to 33V Operating Junction Temperature Range ON MODE/SYNC, RT, ITH, (Notes 2, 7) ............................................ ?40?C to 150?C V Voltage ................................?0.3V to INTV + 0.3V Storage Temperature Range .................. ?65?C to 150?C FB CC INTV Voltage ............................................ ?0.3V to 6V Lead Temperature (Soldering, 10 sec) MSE ..........300?C CC PIN CONFIGURATION TOP VIEW TOP VIEW SGND 1 14 SVIN SGND 1 16 SVIN V 2 13 RUN FB V 2 15 RUN FB ITH 3 12 EXTV ITH 3 14 EXTV CC CC 15 17 RT 4 13 INTV CC RT 4 11 INTV PGND CC V 5 PGND 12 BOOST ON V 5 10 BOOST PGOOD 6 11 SW ON MODE/SYNC 7 10 PVIN PGOOD 6 9 SW NC 8 9 PVIN MODE/SYNC 7 8 PVIN MSE PACKAGE 16-LEAD PLASTIC MSOP DE PACKAGE T = 150?C, ? = 38?C/W JMAX JA 14-LEAD (4mm ? 3mm) PLASTIC DFN EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB T = 150?C, ? = 43?C/W JMAX JA EXPOSED PAD (PIN 15) IS PGND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3646EDE#PBF LTC3646EDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 85?C LTC3646IDE#PBF LTC3646IDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 125?C LTC3646HDE#PBF LTC3646HDE#TRPBF 3646 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 150?C LTC3646EMSE#PBF LTC3646EMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 85?C LTC3646IMSE#PBF LTC3646IMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 125?C LTC3646HMSE#PBF LTC3646HMSE#TRPBF 3646 16-Lead Plastic MSOP ?40?C to 150?C LTC3646EDE-1#PBF LTC3646EDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 85?C LTC3646IDE-1#PBF LTC3646IDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 125?C LTC3646HDE-1#PBF LTC3646HDE-1#TRPBF 36461 14-Lead (4mm ? 3mm) Plastic DFN ?40?C to 150?C LTC3646EMSE-1#PBF LTC3646EMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 85?C LTC3646IMSE-1#PBF LTC3646IMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 125?C LTC3646HMSE-1#PBF LTC3646HMSE-1#TRPBF 36461 16-Lead Plastic MSOP ?40?C to 150?C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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/ 36461fc 2 For more information www.linear.com/LTC3646LTC3646/LTC3646-1 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at T = 25?C (Note 2), PVIN = SVIN = 12V unless otherwise noted. A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply (PVIN, SVIN) l V Input Voltage Operating Range 4.0 40 V IN V Input Supply Overvoltage Lockout V Rising l 43.5 46 V IN(OV) IN Hysteresis (V Falling) l 2.0 2.5 2.9 V IN V Input Supply Undervoltage Lockout V Falling 3.2 3.35 3.5 V IN(UV) IN Hysteresis (V Rising) 250 mV IN I DC Supply Current (Note 3) Q Forced Continuous 620 875 ?A Sleep Mode 140 190 ?A Shutdown Mode V = 0V 8 ?A RUN Main Control Loop V Output Voltage Range (Note 4) LTC3646 2.0 30 V OUT LTC3646-1 0.6 15 V V Feedback Reference Voltage ?40?C < T < 85?C 0.594 0.6 0.606 V FB A l 0.591 0.6 0.609 V Feedback Voltage Line Regulation V = 4.0V to 40V, I = 1.5V 0.05 %/V IN TH Feedback Voltage Load Regulation I = 1.0V to 1.8V 0.12 % TH l Feedback Input Current V = 0.6V 0 ?20 nA FB g Error Amplifier Transconductance External Comp 300 ?S m(EA) t Minimum On-Time V = 40V, R = 30k, V = 2V 30 ns ON(MIN) IN RT ON t Minimum Off-Time 80 ns OFF(MIN) l I Valley Switch Current Limit 0.9 1.2 1.5 A LIM Negative Valley Switch Current Limit ?0.3 A Internal Oscillator Frequency V = V 1.6 2.25 2.95 MHz RT INTVCC R = 450kO 0.19 0.2 0.27 MHz RT R = 60kO 1.25 1.5 1.75 MHz RT R = 30kO 2.55 3.0 3.45 MHz RT External Clock Frequency Range 0.2 3.0 MHz R Top Switch On-Resistance (Note 5) V = 5.5V 200 m ? DS(ON) IN Bottom Switch On-Resistance (Note 5) V = 5.5V 120 m? IN Switch Leakage V = V = 40V, V = 0V ?1 ?A IN SW RUN V = 40V, V = 0V, V = 0V ?1 ?A IN SW RUN Internal V Regulator CC l V INTV Voltage I = 5mA 4.8 5.0 5.2 V INTVCC CC INTVCC INTV Load Regulation (Note 6) I = 0mA to 5mA 0.5 % CC INTVCC INTV Undervoltage Lockout INTV Falling 3.0 V CC CC INTV UVLO Hysteresis 0.3 V CC EXTV Switchover Voltage EXTV Rising 4.25 4.5 4.65 V CC CC EXTV Hysteresis 200 mV CC Operation V RUN Pin Threshold RUN Rising 1.17 1.21 1.26 V RUN RUN Falling 1.06 1.10 1.14 V Hysteresis 110 mV RUN Pin Leakage Current RUN = 1.3V 0 ?1 ?A V PGOOD Overvoltage Threshold FB Rising 5.0 7.5 10 %V PGOOD(UT) FB FB Falling 3.5 5 %V FB V PGOOD Undervoltage Threshold FB Falling ?5.0 ?7.5 ?10 %V PGOOD(LT) FB FB Rising ?3.5 ?5 %V FB 36461fc 3 For more information www.linear.com/LTC3646