LT3992

PRODUCTION

Monolithic Dual Tracking 3A Step-Down Switching Regulator

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Overview

  • Wide Input Range:
    • – Operation from 3V to 60V
  • Independent Supply, Shutdown, Soft-Start, UVLO, Programmable Current Limit and Programmable Power Good for Each 3A Regulator
  • Die Temperature Monitor
  • Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2MHz with Synchronized Clock Output
  • Independent Synchronized Switching Frequencies Optimize Component Size
  • Antiphase Switching
  • Outputs Can Be Paralleled
  • Flexible Output Voltage Tracking
  • Low Dropout: 95% Maximum Duty Cycle
  • 5mm × 5mm QFN Package
  • FMEA Compliant 38-Pin Exposed Pad TSSOP Package

The LT3992 is a dual current mode PWM step-down DC/DC converter with two internal 4.6A switches. Independent input voltage, shutdown, feedback, soft-start, UVLO 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 2MHz 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 current to <10μA.

Applications

  • Automotive Supplies
  • Distributed Supply Regulation
LT3992
Monolithic Dual Tracking 3A Step-Down Switching Regulator
12V and 5V 2-Stage Multi-Frequency Step-Down Converter Independent Synchronized Switching Frequencies Extend Full Frequency Input Range Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
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Protection Switches & Controllers 2
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Switching Regulators & Controllers 1
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3992
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
DC1537A

LT3992EFE Demo Board | Dual Buck with Tracking, 7V ≤ VIN ≤ 60V, VOUT1 = 5V @ 2A, VOUT2 = 3.3V @ 2A

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Product Details

The demo circuit 1537A is a dual current mode PWM step-down DC/DC converter featuring LT3992. The demo circuit is designed for 5V and 3.3V outputs from a 7V to 60V input. The current capability of each channel is up to 3A when running individually and 2A when both are sourcing the same current without special heat sinking. Individual soft-start, current limit, comparator, input voltage for each output as well as frequency division and synchronous and clock output functions simplify the complex design of dual-output power converters.
DC1537A
LT3992EFE Demo Board | Dual Buck with Tracking, 7V ≤ VIN ≤ 60V, VOUT1 = 5V @ 2A, VOUT2 = 3.3V @ 2A
DC1537A - Schematic

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