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LTC3723-1 Dataheets PDF



Part Number LTC3723-1
Manufacturers Linear Technology
Logo Linear Technology
Description Synchronous Push-Pull PWM Controllers
Datasheet LTC3723-1 DatasheetLTC3723-1 Datasheet (PDF)

U U FEATURES ■ High Efficiency Synchronous Push-Pull PWM ■ 1.5A Sink, 1A Source Output Drivers ■ Supports Push-Pull, Full-Bridge, Half-Bridge, and Forward Topologies ■ Adjustable Push-Pull Dead-Time and Synchronous Timing ■ Adjustable System Undervoltage Lockout and Hysteresis ■ Adjustable Leading Edge Blanking ■ Low Start-Up and Quiescent Currents ■ Current Mode (LTC3723-1) or Voltage Mode (LTC3723-2) Operation ■ Single Resistor Slope Compensation ■ VCC UVLO and 25mA Shunt Regulator ■ Programm.

  LTC3723-1   LTC3723-1


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U U FEATURES ■ High Efficiency Synchronous Push-Pull PWM ■ 1.5A Sink, 1A Source Output Drivers ■ Supports Push-Pull, Full-Bridge, Half-Bridge, and Forward Topologies ■ Adjustable Push-Pull Dead-Time and Synchronous Timing ■ Adjustable System Undervoltage Lockout and Hysteresis ■ Adjustable Leading Edge Blanking ■ Low Start-Up and Quiescent Currents ■ Current Mode (LTC3723-1) or Voltage Mode (LTC3723-2) Operation ■ Single Resistor Slope Compensation ■ VCC UVLO and 25mA Shunt Regulator ■ Programmable Fixed Frequency Operation to 1MHz ■ 50mA Synchronous Output Drivers ■ Soft-Start, Cycle-by-Cycle Current Limiting and Hiccup Mode Short-Circuit Protection ■ 5V, 15mA Low Dropout Regulator ■ Available in 16-Pin SSOP Package U APPLICATIO S ■ Telecommunications, Infrastructure Power Systems ■ Distributed Power Architectures LTC3723-1/LTC3723-2 Synchronous Push-Pull PWM Controllers DESCRIPTIO The LTC®3723-1/LTC3723-2 synchronous push-pull PWM controllers provide all of the control and protection functions necessary for compact and highly efficient, isolated power converters. High integration minimizes external component count, while preserving design flexibility. The robust push-pull output stages switch at half the oscillator frequency. Dead-time is independently programmed with an external resistor. Synchronous rectifier timing is adjustable to optimize efficiency. A UVLO program input provides precise system turn-on and turn off voltages. The LTC3723-1 features peak current mode control with programmable slope compensation and leading edge blanking, while the LTC3723-2 employs voltage mode control with voltage feedforward capability. The LTC3723-1/LTC3723-2 feature extremely low operating and start-up currents. Both devices provide reliable short-circuit and overtemperature protection. The LTC3723-1/LTC3723-2 are offered in a 16-pin SSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATIO Isolated Push-Pull Converter VOUT VIN FROM AUXILIARY WINDING VREF UVLO DRVA SPRG VCC DPRG DRVB CS CT SDRA RLEB SDRB VREF LTC3723-1 SS COMP FB GND •• ME SYNC LTC3901 MF VREF VOUT VOUT V+ COLL LT1431 RREF GND-F GND-S 372312 TA01 372312f 1 LTC3723-1/LTC3723-2 U WW W ABSOLUTE AXI U RATI GS (Note 1) VCC to GND (Low Impedance Source) .......– 0.3V to 10V (Chip Self-Regulates at 10.3V) UVLO to GND ............................................. – 0.3V to VCC All Other Pins to GND (Low Impedance Source) .........................– 0.3V to 5.5V VCC (Current Fed) ................................................. 40mA UW U PACKAGE/ORDER I FOR ATIO VREF Output Current ............................... Self-Regulated Operating Temperature (Notes 5,6) LTC3723E ........................................... – 40°C to 85°C Storage Temperature Range ................. – 65°C to 125°C Lead Temperature (Soldering, 10sec)................... 300°C TOP VIEW VREF 1 SDRB 2 SDRA 3 DRVB 4 VCC 5 DRVA 6 GND 7 CT 8 16 SPRG 15 UVLO 14 SS 13 FB 12 RLEB 11 COMP 10 CS 9 DPRG GN PACKAGE 16-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 100°C/W ORDER PART NUMBER LTC3723EGN-1 GN PART MARKING 37231 Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: http://www.linear.com/leadfree/ Consult LTC Marketing for parts specified with wider operating temperature ranges. TOP VIEW VREF 1 SDRB 2 SDRA 3 DRVB 4 VCC 5 DRVA 6 GND 7 CT 8 16 SPRG 15 UVLO 14 SS 13 FB 12 DPRG 11 COMP 10 CS 9 RAMP GN PACKAGE 16-LEAD PLASTIC SSOP TJMAX = 125°C, θJA = 100°C/W ORDER PART NUMBER LTC3723EGN-2 GN PART MARKING 37232 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 9.5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply VCCUV VCCHY ICCST ICCRN VSHUNT RSHUNT SUVLO VCC Undervoltage Lockout VCC UVLO Hysteresis Start-Up Current Operating Current Shunt Regulator Voltage Shunt Resistance System UVLO Threshold SHYST System UVLO Hysteresis Current Pulse Width Modulator Measured on VCC Measured on VCC VCC = VUVLO – 0.3V No Load on Outputs 10.25 10.7 V 3.8 4.2 V ● 145 230 µA 3 8 mA Current into VCC = 10mA Current into VCC = 10mA to 17mA Measured on UVLO Pin, 10mA into VCC Current Flows Out of UVLO Pin, 10mA into VCC 10.3 10.8 V 1.4 3.5 Ω 4.8 5.0 5.2 V 8.5 10 11.5 µA ROS Ramp Offset Voltage Measured on COMP, RAMP = 0V 0.65 V IRMP Ramp Discharge Current RAMP = 1V, COMP = 0V, CT = 4V, 3723-1 Only 50 mA 372312f 2 LTC3723-1/LTC3723-2 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 9.5V unless otherwise noted. SYMBOL PARAMETE.


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