LT3692

PRODUCTION

Monolithic Dual Tracking 3.5A Step-Down Switching Regulator

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Overview

  • Wide Input Range:
    • Operation from 3V to 36V
    • OVLO Protects Circuit Through 60V Transients
  • Independent Supply, Shutdown, Soft-Start, Programmable Current Limit and Programmable Power Good for Each 3.5A Regulator
  • Die Temperature Monitor
  • Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.25MHz with Synchronized Clock Output
  • Independent Synchronized Switching Frequencies Optimize Component Size
  • Antiphase Switching
  • Outputs Can Be Paralleled
  • Flexible Output Voltage Tracking
  • Enhanced Short-Circuit Protection
  • Low Dropout: 95% Maximum Duty Cycle
  • 5mm × 5mm QFN Package

The LT3692 is a dual current mode PWM step-down DC/DC converter with two internal 3.8A switches. Independent input voltage, shutdown, feedback, soft-start, current limit and comparator pins for each channel simplify complex power supply tracking and sequencing requirements.

To optimize efficiency and component size, both converters have a programmable maximum current limit and are synchronized to either a common external clock input, or a resistor settable fixed 250kHz to 2.25MHz internal oscillator. A frequency divider is provided for channel 1 to further optimize component size. At all frequencies, a 180° phase relationship between channels is maintained, reducing voltage ripple and component size. A clock output is available for synchronizing multiple regulators.

Minimum input to output voltage ratios are improved by allowing the switch to stay on through multiple clock cycles only switching off when the boost capacitor needs recharging. Independent channel operation can be programmed using the SHDN pin. Disabling both converters reduces the total quiescent to <10μA.

  Min On-Time Features Package
LT3692 180ns - 5x5 QFN-32
LT3692A 140ns Programmable Shutdown UVLO TSSOP-38E, 5x5 QFN-32

Applications

  • Automotive Supplies
  • Distributed Supply Regulation
LT3692
Monolithic Dual Tracking 3.5A Step-Down Switching Regulator
Dual 1.8V/3.5A and 5V/3.5A Step-Down Converter Independent Synchronized Switching Frequencies Extend Full Frequency Input Range Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Data Sheet

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Software Resources

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Hardware Ecosystem

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3692
  • LT3692A
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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.

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