LT3742

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Dual, 2-Phase Step-Down Switching Controller

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Overview

  • Wide Input Voltage Range: 4V to 30V
  • Wide Output Voltage Range: 0.8V to VIN
  • Low Shutdown IQ: 20μA
  • Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • 0.8V ±1.5% Voltage Reference
  • 500kHz Current Mode Fixed Frequency Operation
  • Internal Boost Converter Provides Bias Rail for N-Channel MOSFET Gate Drive
  • Power Good Voltage Monitor for Each Output
  • Programmable Soft-Start
  • 24-Lead 4mm × 4mm × 0.75mm Package

The LT3742 is a dual step-down DC/DC switching regulator controller that drives high side N-channel power MOSFETs. A 500kHz fixed frequency current mode architecture provides fast transient response with simple loop compensation components and cycle-by-cycle current limiting. The output stages of the two controllers operate 180° out of phase to reduce the input ripple current, minimizing the noise induced on the input supply, and allowing less input capacitance.

An internal boost regulator generates a bias rail of VIN + 7V to provide gate drive for the N-channel MOSFETs allowing low dropout and 100% duty cycle operation. The LT3742 can be used for applications where both controllers need to operate independently, or where both controllers are used to provide a single higher current output.

The device is available in a thermally enhanced 4mm × 4mm QFN package.

Applications

  • Satellite and Cable TV Set-Top Boxes
  • Distributed Power Regulation
  • Automotive Systems
  • Super Capacitor Charger
LT3742
Dual, 2-Phase Step-Down Switching Controller
8V and 5V Dual Step-Down Converter Efficiency vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 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
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3742
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
DC927A

LT3742EFE Demo Board | 5.5V ≤ VIN ≤ 28V, VOUT1 = 5V @ 4A, VOUT2 = 3.3V @ 4A

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Product Details

Demonstration circuit 927 is a dual output step-down converter featuring the LT3742, a two-phase nonsynchronous buck controller. The demo board operates with a 5.5V to 28V input suppy and provides outputs of 5V@4A and 3.3V@4A.


 
DC927A
LT3742EFE Demo Board | 5.5V ≤ VIN ≤ 28V, VOUT1 = 5V @ 4A, VOUT2 = 3.3V @ 4A
DC927A - Schematic

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