LTC3723-1/LTC3723-2 Synchronous Push-Pull PWM Controllers FEATURES DESCRIPTIO High Efficiency Synchronous Push-Pull PWM The LTC 3723-1/LTC3723-2 synchronous push-pull PWM 1.5A Sink, 1A Source Output Drivers controllers provide all of the control and protection func- Supports Push-Pull, Full-Bridge, Half-Bridge, and tions necessary for compact and highly efficient, isolated Forward Topologies power converters. High integration minimizes external Adjustable Push-Pull Dead-Time and Synchronous component count, while preserving design flexibility. Timing The robust push-pull output stages switch at half the Adjustable System Undervoltage Lockout and oscillator frequency. Dead-time is independently pro- Hysteresis grammed with an external resistor. Synchronous rectifier Adjustable Leading Edge Blanking timing is adjustable to optimize efficiency. A UVLO pro- Low Start-Up and Quiescent Currents gram input provides precise system turn-on and turn off Current Mode (LTC3723-1) or Voltage Mode voltages. The LTC3723-1 features peak current mode (LTC3723-2) Operation control with programmable slope compensation and lead- Single Resistor Slope Compensation ing edge blanking, while the LTC3723-2 employs voltage V UVLO and 25mA Shunt Regulator CC mode control with voltage feedforward capability. Programmable Fixed Frequency Operation to 1MHz 50mA Synchronous Output Drivers The LTC3723-1/LTC3723-2 feature extremely low operat- Soft-Start, Cycle-by-Cycle Current Limiting and ing and start-up currents. Both devices provide reliable Hiccup Mode Short-Circuit Protection short-circuit and overtemperature protection. The 5V, 15mA Low Dropout Regulator LTC3723-1/LTC3723-2 are offered in a 16-pin SSOP Available in 16-Pin SSOP Package package. U , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. APPLICATIO S Telecommunications, Infrastructure Power Systems Distributed Power Architectures TYPICAL APPLICATIO Isolated Push-Pull Converter V OUT V IN ME UVLO DRVA SYNC FROM AUXILIARY LTC3901 SPRG DRVB WINDING V CS CC MF V DPRG REF C SDRA T V V REF OUT R SDRB LEB V REF + V LTC3723-1 COLL R REF V OUT LT1431 SS COMP GND-F GND-S FB GND 372312 TA01 372312f 1 U ULTC3723-1/LTC3723-2 ABSOLUTE AXI U RATI GS (Note 1) V to GND (Low Impedance Source) .......0.3V to 10V V Output Current ............................... Self-Regulated CC REF (Chip Self-Regulates at 10.3V) Operating Temperature (Notes 5,6) UVLO to GND............................................. 0.3V to V LTC3723E ........................................... 40C to 85C CC All Other Pins to GND Storage Temperature Range ................. 65C to 125C (Low Impedance Source) .........................0.3V to 5.5V Lead Temperature (Soldering, 10sec)................... 300C V (Current Fed) ................................................. 40mA CC UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW V 1 16 SPRG V 1 16 SPRG REF REF SDRB 2 15 UVLO SDRB 2 15 UVLO SDRA 3 14 SS SDRA 3 14 SS DRVB 4 13 FB DRVB 4 13 FB V 5 12 R V 5 12 DPRG CC LEB CC DRVA 6 11 COMP DRVA 6 11 COMP GND 7 10 CS GND 7 10 CS C 8 9 DPRG C 8 9 RAMP T T GN PACKAGE GN PACKAGE 16-LEAD PLASTIC SSOP 16-LEAD PLASTIC SSOP T = 125C, = 100C/W T = 125C, = 100C/W JMAX JA JMAX JA ORDER PART NUMBER GN PART MARKING ORDER PART NUMBER GN PART MARKING LTC3723EGN-1 37231 37232 LTC3723EGN-2 Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: