LT3692A

PRODUCTION

Monolithic Dual Tracking 3.5A Step-Down Switching Regulator

Data Sheet Product Selection Table
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Overview

  • Wide Input Range:
    • Operation from 3V to 36V
    • OVLO Protects Circuit Through 60V Transients
  • Independent Supply, Shutdown, Soft-Start, UVLO, 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
  • Low Dropout: 95% Maximum Duty Cycle
  • 5mm × 5mm QFN Package
  • FMEA Compliant 38-Pin Exposed Pad TSSOP Package

The LT3692A is a dual current mode PWM step-down DC/DC converter with two internal 3.8A 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 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 current to <10μA.

The LT3692A is an improved version of the LT3692 with reduced minimum on-time.

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

Applications

  • Automotive Supplies
  • Distributed Supply Regulation
LT3692A
Monolithic Dual Tracking 3.5A Step-Down Switching Regulator
3.3V and 1.2V 2-Stage Dual Step-Down Multi-Frequency 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

Design Note 1

Technical Articles 1

Data Sheet

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

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Oscillators 1
LTC6908
Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LTC4364
RECOMMENDED FOR NEW DESIGNS Surge Stopper with Ideal Diode
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3692
  • LT3692A
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
DC1403A

LT3692A Demo Board I 7V to 36V Input, VOUT1 = 5V @ 3A, VOUT2 = 3.3V @ 3A

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Product Details

Demonstration circuit 1403A is a dual current mode PWM step-down DC/DC converter featuring the LT3692A. The demo circuit is designed for 5V and 3.3V outputs from a 7V to 36V input. The current capability of each channel is up to 3A. Though the LT3692A has over-voltage protection to 60V, the demo board is not designed to highlight this feature.



DC1403A
LT3692A Demo Board I 7V to 36V Input, VOUT1 = 5V @ 3A, VOUT2 = 3.3V @ 3A
DC1403A - Schematic

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