LTC3723

PRODUCTION

Synchronous Push-Pull PWM Controllers

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Overview

  • High Efficiency Synchronous Push-Pull PWM
  • 1.5A Sink, 1A Source Output Drivers
  • 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) and 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

The LTC3723-1/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 over temperature protection. The LTC3723-1/LTC3723-2 are offered in a 16-pin SSOP package.

Applications

  • Telecommunications, Infrastructure Power Systems
  • Distributed Power Architectures
LTC3723
Synchronous Push-Pull PWM Controllers
Isolated Push-Pull Converter Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Technical Articles 2

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3723-1
  • LTC3723-2
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC541A

LTC3723EGN-1 Demo Board | Isolated Supply, 36V ≤ VIN ≤ 72V, VOUT1 = 3.3V @ 40A, VOUT2 = 2.5V @ 10A

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Product Details

Demonstration circuit 541A is an isolated synchronous push-pull converter featuring the LTC3723-1, LTC3901, LT1431 and LT3710. The design provides an isolated 3.3V at 40A and 2.5V at 10A from a 48V telecom (36V to 72V) input voltage. Isolation voltage is 1500VDC.


The demo board also can provide 3.3V @ 50A with the 2.5V output disabled.

eval board
schematic 2
DC719A

LTC3723EGN-1 Isolated Demo Board | Sync Push-Pull Controller with Synchronous Rectification, 42V ≤ VIN ≤ 56V, 12VOUT @ 20A

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Product Details

Demonstration circuit 719 is an Isolated Full-Bridge Converter with Synchronous Rectification featuring the LTC3723-1, LTC3901, LTC4440, and LT1431. It operates at 300kHz and produces a regulated 12V, 20A output in a quarter-brick footprint from a typical telecom input voltage range of 42 to 56V. Synchronous rectification helps to attain efficiency approaching 96%. Isolation voltage is 1500VDC.
DC541A
LTC3723EGN-1 Demo Board | Isolated Supply, 36V ≤ VIN ≤ 72V, VOUT1 = 3.3V @ 40A, VOUT2 = 2.5V @ 10A
DC541A - Schematic
DC719A
LTC3723EGN-1 Isolated Demo Board | Sync Push-Pull Controller with Synchronous Rectification, 42V ≤ VIN ≤ 56V, 12VOUT @ 20A
DC719A - Schematic

Latest Discussions

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Simulation of LTC3723-1 vs LTC3723-2
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28V to 5V/22A Isolated current fed pushpull converter for Airborn Applications
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