LTC3251

PRODUCTION

500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters

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Overview

  • Up to 500mA Output Current
  • No Inductors
  • 2.7V to 5.5V Input Voltage Range
  • 2x Efficiency Improvement Over LDOs
  • 2-Phase, Spread Spectrum Operation for Low Input and Output Noise
  • Shutdown Disconnects Load from VIN
  • Adjustable Output Voltage Range: 0.9V to 1.6V
    • Fixed Output Voltages: 1.2V, 1.5V
  • Super Burst, Burst and Burst Defeat Operating Modes
  • Low Operating Current: IIN = 35µA (Burst Mode® Operation)
  • Super Burst Operating Current: IIN = 10µA
  • Low Shutdown Current: IIN = 0.01µA Typ
  • Soft-Start Limits Inrush Current at Turn-On
  • Short-Circuit and Overtemperature Protected
  • Available in a Thermally Enhanced 10-Pin MSOP Package

The LTC3251/LTC3251-1.2/LTC3251-1.5 are 2-phase charge pump step-down DC/DC converters that produce a regulated output from a 2.7V to 5.5V input. The parts use switched capacitor fractional conversion to achieve twice the typical efficiency of a linear regulator. No inductors are required. VOUT is resistor programmable from 0.9V to 1.6V or fixed at 1.2V or 1.5V, with up to 500mA of load current available.

A unique 2-phase spread spectrum architecture provides a very low noise regulated output as well as low noise at the input. The parts have four operating modes: Continuous Spread Spectrum, Spread Spectrum with Burst Mode operation, Super Burst™ mode operation and shutdown.

Low operating current (35µA in Burst Mode operation, 10µA in Super Burst mode operation) and low external parts count make the LTC3251/LTC3251-1.2/LTC3251-1.5 ideally suited for space-constrained battery-powered applications. The parts are short-circuit and over-temperature protected, and are available in a thermally enhanced 10-pin MSOP package.

Applications

  • Handheld Devices
  • Cellular Phones
  • Portable Electronic Equipment
  • DSP Power Supplies
LTC3251
500mA High Efficiency, Low Noise, Inductorless Step-Down DC/DC Converters
Spread Spectrum Step-Down Converter 1.5V Efficiency vs Input Voltage (Burst Mode Operation) Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 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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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3251
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
DC506A

LTC3251EMSE Demo Board | Spread-Spectrum, Low Noise, Inductorless Step-Down Charge Pump, 3.2V ≤ VIN ≤ 5.5V, VOUT @ Up to 500mA

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Product Details

Demonstration circuit 506A is a two-phase, step down charge pump DC/DC converter featuring the LTC3251EMSE. It produces a regulated 1.5V output voltage at up to 500mA of output current from a 3.2V to 5.5V input. The LTC3251's unique two-phase, spread spectrum architecture provides high efficient and low noise operation.
DC506A
LTC3251EMSE Demo Board | Spread-Spectrum, Low Noise, Inductorless Step-Down Charge Pump, 3.2V ≤ VIN ≤ 5.5V, VOUT @ Up to 500mA
DC506A - Schematic

Latest Discussions

2 Years Ago
LTC3251-1.2 Connection Doubt
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