LTC1430

PRODUCTION

High Power Step-Down Switching Regulator Controller

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Overview

  • High Power 5V to 3.xV Switching Controller:
    Can Exceed 10A Output
  • All N-Channel External MOSFETs
  • Constant Frequency Operation - Small Inductors
  • Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
  • High Efficiency: Over 95% Possible
  • Fixed Frequency Operation
  • No Low Value Sense Resistor Needed
  • Outputs Can Drive External FETs with Up to 10,000pF Gate Capacitance
  • Quiescent Current: 350µA Typ, 1µA in Shutdown
  • Fast Trasient Response
  • Adjustable or fixed 3.3 V Output
  • Available in 8- and 16- Lead PDIP and SO Packages

The LTC1430 is a high power, high efficiency switching regulator controller optimized for 5V to 3.xV applications. It includes a precision internal reference and an internal feedback system that can provide output regulation of ±1% over temperature, load current and line voltage shifts. The LTC1430 uses a synchronous switching architecture with two N-channel output devices, eliminating the need for a high power, high cost P-channel device. Additionally, it senses output current across the drain-source resistance of the upper N-channel FET, providing an adjustable current limit without an external low value sense resistor.

The LTC1430 includes a fixed frequency PWM oscillator for low output ripple under virtually all operating conditions. The 200kHz free-running clock frequency can be externally adjusted from 100kHz to above 500kHz. The LTC1430 features low 350µA quiescent current, allowing greater than 90% efficiency operation in converter designs from 1A to greater than 50A output current. Shutdown mode drops the LTC1430 supply current to 1µA.

For new designs, refer to the LTC3830.

Applications

  • Power Supply for P6 and Pentium® Microprocessors
  • High Power 5V to 3.xV Regulators
  • Local Regulation for Dual Voltage Logic Boards
  • Low Voltage, High Current Battery Regulation
LTC1430
High Power Step-Down Switching Regulator Controller
Typical 5V to 3.3V, 10A Application Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Application Note 2

Design Note 1

Technical Articles 4

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
LTC3830
PRODUCTION High Power Step-Down Synchronous DC/DC Controllers for Low Voltage Operation
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1430
  • LTC1430A
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.

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