TPS54428 Datasheet, PDF (1/22 Pages) Texas Instruments – 4.5V to 18 V Input, 4-A Synchronous Step-Down SWIFT™ Converter with Eco-Mode™

TPS54428
www.ti.com
SLVSB42A – NOVEMBER 2011 – REVISED JANUARY 2012
4.5V to 18 V Input, 4-A Synchronous Step-Down SWIFT™ Converter with Eco-Mode™
Check for Samples: TPS54428
FEATURES
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•23 D-CAP2™ Mode Enables Fast Transient
Response
• Low Output Ripple and Allows Ceramic Output
Capacitor
• Wide V_IN Input Voltage Range: 4.5 V to 18 V
• Output Voltage Range: 0.76 V to 7.0 V
• Highly Efficient Integrated FETs Optimized
for Lower Duty Cycle Applications
– 70 mΩ (High Side) and 53 mΩ (Low Side)
• High Efficiency, Less Than 10 μA at Shutdown
• High Initial Bandgap Reference Accuracy
• Adjustable Soft Start
• Pre-Biased Soft Start
• 650-kHz Switching Frequency (f_SW)
• Cycle By Cycle Over Current Limit
• Auto-Skip Eco-mode™ for High Efficiency at
Light Load
APPLICATIONS
• Wide Range of Applications for Low Voltage
System
– Digital TV Power Supply
– High Definition Blu-ray Disc™ Players
– Networking Home Terminal
– Digital Set Top Box (STB)
DESCRIPTION
The TPS54428 is an adaptive on-time D-CAP2™
mode synchronous buck converter.
The TPS54428 enables system designers to
complete the suite of various end-equipment power
bus regulators with a cost effective, low component
count, low standby current solution.
The main control loop for the TPS54428 uses the
D-CAP2™ mode control that provides a fast transient
response with no external compensation
components.
The adaptive on-time control supports seamless
transition between PWM mode at higher load
conditions and Eco-mode™ operation at light loads.
Eco-mode™ allows the TPS54428 to maintain high
efficiency during lighter load conditions.
The TPS54428 also has a proprietary circuit that
enables the device to adopt to both low equivalent
series resistance (ESR) output capacitors, such as
POSCAP or SP-CAP, and ultra-low ESR ceramic
capacitors. The device operates from 4.5-V to 18 V
VIN input.
The output voltage can be programmed between
0.76 V and 7.0 V.
The device also features an adjustable soft start time.
The TPS54428 is available in the 8-pin DDA
package,and designed to operate from –40°C to
85°C.
.
TPS54428DDA
Vout(50mV/div)
Iout(2A/div)
100us/div
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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.
D-CAP2 is a trademark of Texas Instruments.
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Blu-ray Disc is a trademark of Blu-ray Disc Association.
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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 © 2011–2012, Texas Instruments Incorporated