TPS5403 Datasheet, PDF (1/18 Pages) Texas Instruments – 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

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
FEATURES
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• Fixed 3.3-V Output
• 4.5-V to 28-V Wide Input Voltage Range
• Up to 1.7-A Maximum Continuous Output
Loading Current
• Pulse Skipping Mode to Achieve High Light
Load Efficiency
• Over 80% Efficiency at 10-mA Loading
• Adjustable 50-kHz to 1.1-MHz Switching
Frequency Set by an External Resistor
(Leave pin ROSC floating. Set frequency to
120 kHz and ground connection to 70 kHz)
• Peak Current-Mode Control
• Cycle-by-Cycle Over Current Protection
• Frequency Spread Spectrum and Switching
Node Anti-Ringing to Ease EMI Issue
• External Soft Start
• Available in SOIC8 Package
APPLICATIONS
• 5-V, 9-V, 12-V and 24-V Distributed Power
Systems
• Consumer Applications Such as Home
Appliances, Set-Top Boxes, CPE Equipment,
LCD Displays, Peripherals, and Battery
Chargers
• Industrial and Car Entertainment Power
Supplies
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2012, Texas Instruments Incorporated