LTC3636/LTC3636-1 Dual Channel 6A, 20V Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTION n Wide V Range: 3.1V to 20V The LTC 3636/LTC3636-1 is a high efficiency, dual- IN n Wide V Range: channel monolithic synchronous buck regulator using a OUT n 0.6V to 5V (LTC3636) controlled on-time current mode architecture, with phase n 1.8V to 12V (LTC3636-1) lockable switching frequency. The operating supply volt- n Output Current per Channel: 6A age range is from 3.1V to 20V, making it suitable for n High Efficiency: Up to 95% lithium-ion battery stacks as well as point of load power n Die Temperature Monitor supply applications from a 12V or 5V input. n Adjustable Switching Frequency: 500kHz to 4MHz The operating frequency is programmable from 500kHz to n External Frequency Synchronization 4MHz with an external resistor and may be synchronized n Current Mode Operation for Excellent Line and to an external clock signal. The high frequency capability Load Transient Response allows the use of small surface mount inductors and n 0.6V Reference Allows Low Output Voltages capacitors. The unique constant frequency/controlled on- n User Selectable Burst Mode Operation or Forced time architecture is ideal for high step-down ratio applica- Continuous Operation tions that operate at high frequency while demanding fast n Output Voltage Tracking and Soft-Start Capability transient response. n Short-Circuit Protected n The LTC3636/LTC3636-1 can select between forced con- Overvoltage Input and Overtemperature Protection n tinuous mode and high efficiency Burst Mode operation. Power Good Status Outputs n The LTC3636 and LTC3636-1 differ in their output voltage Low Profile 4mm 5mm 28-Lead QFN Package sense range. n AEC-Q100 Qualified for Automotive Applications All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611. APPLICATIONS n Distributed Power Systems n Battery-Powered Instruments n Point-of-Load Power Supplies TYPICAL APPLICATION V IN 10V TO 20V Efficiency vs Load Current 47F V V IN2 IN1 100 2 RUN1 INTV CC f = 2MHz SW RUN2 ITH1 97 4.7F V = 12V LTC3636/ IN ITH2 LTC3636-1 94 RT 91 TMON MODE/SYNC 88 TRACKSS2 TRACKSS1 PGOOD2 PGOOD1 85 BOOST2 BOOST1 82 0.1F 0.1F 0.56H 0.56H 79 V V OUT2 OUT1 SW2 SW1 76 5V AT 6A 3.3V AT 6A 47F 47F 73.2k 45.3k V = 5V OUT 73 22pF 22pF V = 3.3V OUT V V FB2 GND FB1 70 0 0.6 1.2 1.8 2.4 3 3.6 4.2 4.8 5.4 6.0 10k 10k LOAD CURRENT (A) 3636 TA01a 3636 TA01b Rev. D 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTC3636/LTC3636-1 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V , V ................................................... 0.3V to 22V IN1 IN2 PGOOD1, PGOOD2 ..................................... 0.3V to 22V BOOST1-SW1, BOOST2-SW2 .................... 0.3V to 3.6V 28 27 26 25 24 23 TRACKSS1, TRACKSS2 ............................ 0.3V to 3.6V ITH1 1 22 V IN1 33 ITH1, ITH2, RT, MODE/SYNC ........0.3V to INTV + 0.3V CC SW1T RUN1 2 21 V IN1 V , V , TMON.....................0.3V to INTV + 0.3V FB1 FB2 CC MODE/SYNC 3 20 SW1 30 GNDT RUN1, RUN2 .............................................. 0.3V to 22V RT 4 19 GND 32 INTV 5 18 GND Operating Junction Temperature Range CC GNDT 29 TMON 6 INTV 17 SW2 CCT (Notes 3, 4) ............................................ 40C to 125C 31 34 RUN2 7 16 GNDT V IN2 SW2T Storage Temperature Range .................. 65C to 150C 8 ITH2 15 V IN2 9 10 11 12 13 14 UFD PACKAGE VARIATION: AA 28-LEAD (4mm 5mm) PLASTIC QFN T = 125C, = 21C/W, = 7C/W JMAX JA JC DERIVED FROM 6-LAYER PCB DC2335 DEMO BOARD JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3636IUFD PBF LTC3636IUFD TRPBF 3636 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC3636EUFD PBF LTC3636EUFD TRPBF 3636 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC3636IUFD-1 PBF LTC3636IUFD-1 TRPBF 36361 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC3636EUFD-1 PBF LTC3636EUFD-1 TRPBF 36361 28-Lead (4mm 5mm) Plastic QFN 40C to 125C AUTOMOTIVE PRODUCTS** LTC3636IUFD WPBF LTC3636IUFD WTRPBF 3636 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC3636EUFD WPBF LTC3636EUFD WTRPBF 3636 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC3636IUFD-1 WPBF LTC3636IUFD-1 WTRPBF 36361 28-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC3636EUFD-1 WPBF LTC3636EUFD-1 WTRPBF 36361 28-Lead (4mm 5mm) Plastic QFN 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. Selection Table PART NUMBER V SENSE RANGE OUT LTC3636 0.6V to 5V LTC3636-1 1.8V to 12V Rev. D 2 For more information www.analog.com V V FB2 FB1 PGOOD2 PGOOD1 TRACKSS2 TRACKSS1 GND GND SW2 SW1 BOOST2 BOOST1