LTC3422

PRODUCTION

1.5A, 3MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

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Overview

  • 700mA Continuous/1A Pulsed Output Current for Li-Ion to 5V Applications
  • Synchronous Rectification: Up to 96% Efficiency
  • True Output Disconnect
  • Inrush Current Limiting
  • Adjustable Automatic Burst Mode® Operation
  • Low Noise, Fixed Frequency Operation from 100kHz to 3MHz
  • 0.5V to 4.5V Input Range
  • 2.25V to 5.25V Adjustable Output Voltage
  • Guaranteed 1V Start-Up
  • Programmable Soft-Start
  • Synchronizable Oscillator
  • Low Quiescent Current: 25μA
  • <1μA Shutdown Current
  • Anti-Ringing Control
  • Small (3mm × 3mm × 0.75mm) Thermally Enhanced 10-Pin DFN Package

The LTC3422 is a high efficiency, current mode, fixed frequency, step-up DC/DC converter with true output disconnect and inrush current limiting. The part is guaranteed to start up from an input voltage of 1V. The device includes a 0.20Ω N-channel MOSFET switch and a 0.24Ω P-channel MOSFET synchronous rectifier. The output voltage, switching frequency, soft-start time, Burst Mode threshold and loop compensation are all simply programmed using tiny external passive components.

Quiescent current is only 25μA during Burst Mode operation, maximizing battery life in portable applications. The oscillator frequency can be programmed up to 3MHz and can be synchronized to an external clock applied to the SYNC pin.

Other features include 1μA shutdown, short-circuit protection, anti-ringing control, thermal shutdown and current limit. The LTC3422 is available in a (3mm × 3mm × 0.75mm) 10-pin DFN package.

Applications

  • Wireless Handsets
  • Handheld Computers
  • GPS Receivers
  • MP3 Players
LTC3422
1.5A, 3MHz Synchronous Step-Up DC/DC Converter with Output Disconnect
2.4V to 3.3V Efficiency and Power Loss Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 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
Switching Regulators & Controllers 1
LTC3529
RECOMMENDED FOR NEW DESIGNS 1.5A, 1.5MHz Step-Up DC/DC Converter in 2mm × 3mm DFN
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3422
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
DC860A

LTC3422EDD Demo Board | 1.8V ≤ VIN ≤ 3V, VOUT = 3.3V @ 600mA (Max)

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Product Details

Demonstration circuit 860 is a 1.5A, 1MHz synchronous boost converter featuring the LTC3422EDD, which features true output disconnect in shutdown. The demo board produces 3.3V at 600mA (max) from a 1.8V to 3V input voltage range.
DC860A
LTC3422EDD Demo Board | 1.8V ≤ VIN ≤ 3V, VOUT = 3.3V @ 600mA (Max)
DC860A - Schematic

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