LT3430

PRODUCTION

High Voltage, 3A, 200kHz Step-Down Switching Regulator

Data Sheet Product Selection Table
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Overview

  • Wide Input Range: 5.5V to 60V
  • 3A Peak Switch Current over All Duty Cycles
  • Constant Switching Frequency:
    • 200kHz (LT3430)
    • 100kHz (LT3430-1)
  • 0.1Ω Switch Resistance
  • Current Mode
  • Effective Supply Current: 2.5mA
  • Shutdown Current: 30µA
  • 1.2V Feedback Reference Voltage
  • Easily Synchronizable
  • Cycle-by-Cycle Current Limiting
  • Small, 16-Pin Thermally Enhanced TSSOP Package

The LT3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 3A, 0.1Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and excellent loop stability.

Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry* maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and a SYNC pin can be externally synchronized with a logic level input from 228kHz to 700kHz for the LT3430 or from 125kHz to 250kHz for the LT3430-1.

The LT3430/LT3430-1 are available in a thermally enhanced 16-pin TSSOP package.

Applications

  • Industrial and Automotive Power Supplies
  • Portable Computers
  • Battery Chargers
  • Distributed Power Systems
LT3430
High Voltage, 3A, 200kHz Step-Down Switching Regulator
5V, 2A Buck Converter Efficiency vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 2

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
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Oscillators 1
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Protection Switches & Controllers 2
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LT4363
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT3430
  • LT3430-1
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
DC1200A

LT3430EFE-1 Demo Board | 5.5V ≤ VIN ≤ 60V, VOUT = 3.3V at 2A

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Product Details

Demonstration circuit 1200 is a 60V, 100kHz, monolithic step-down DC/DC switching converter using the LT3430-1. The circuit is designed for a 5.5V to –60V input, and provides a 3.3V output at 2A load current.

eval board
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC471A

LT3430EFE | High Voltage Buck Converter, VIN = 7.5V to 60V, VOUT = 5V @ 2A

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Product Details

Demonstration circuit 471 is a 60V, 200kHz, monolithic step-down DC/DC switching converter using the LT3430. The circuit is designed for a 7.5V to –60V input, and provides a 5.0V output at 2A load current.
DC1200A
LT3430EFE-1 Demo Board | 5.5V ≤ VIN ≤ 60V, VOUT = 3.3V at 2A
DC1200A - Schematic
DC471A
LT3430EFE | High Voltage Buck Converter, VIN = 7.5V to 60V, VOUT = 5V @ 2A
DC471A Demo Board DC471A Demo Board DC471A Demo Board DC471A Demo Board DC471A - Schematic

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