TPS5403

www.ti.com

SLVSBK5 – SEPTEMBER 2012

4.5-V TO 28-V INPUT VOLTAGE, 3.3-V FIXED OUTPUT, 1.7-A OUTPUT CURRENT,

NON-SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET

Check for Samples: TPS5403

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FEATURES

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Fixed 3.3-V Output

APPLICATIONS

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4.5-V to 28-V Wide Input Voltage Range

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5-V, 9-V, 12-V and 24-V Distributed Power

Systems

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Up to 1.7-A Maximum Continuous Output

Loading Current

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Consumer Applications Such as Home

Appliances, Set-Top Boxes, CPE Equipment,

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Pulse Skipping Mode to Achieve High Light

LCD Displays, Peripherals, and Battery

Load Efficiency

Chargers

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Over 80% Efficiency at 10-mA Loading

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Industrial and Car Entertainment Power

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Adjustable 50-kHz to 1.1-MHz Switching

Supplies

Frequency Set by an External Resistor

(Leave pin ROSC floating. Set frequency to

120 kHz and ground connection to 70 kHz)

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Peak Current-Mode Control

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Cycle-by-Cycle Over Current Protection

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Frequency Spread Spectrum and Switching

Node Anti-Ringing to Ease EMI Issue

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External Soft Start

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Available in SOIC8 Package

DESCRIPTION

The TPS5403 is a monolithic non-synchronous buck regulator with wide operating input voltage range from 4.5 V

to 28 V. Current mode control with internal slope compensation is implemented to reduce component count.

TPS5403 also features a light load pulse skipping mode, which allows for a power loss reduction from the input

power supply to the system at light loading.

The switching frequency of the converters can be set from 50 kHz to 1.1 MHz with an external resistor.

Frequency spread spectrum operation is introduced for EMI reduction.

LX anti-ringing is added to address high frequency EMI issues.

A cycle-by-cycle current limit with frequency fold back protects the IC at over loading condition.

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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.