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TPS54428_16 Datasheet, PDF (1/29 Pages) Texas Instruments – 4-A Synchronous Step-Down Converter | |||
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TPS54428
SLVSB42D â NOVEMBER 2011 â REVISED JANUARY 2016
TPS54428 4.5-V to 18-V Input, 4-A Synchronous Step-Down Converter With Eco-Modeâ¢
1 Features
â¢1 D-CAP2⢠Mode Enables Fast Transient
Response
⢠Low Output Ripple and Allows Ceramic Output
Capacitor
⢠Wide VIN 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
â 70 m⦠(High Side) and 53 m⦠(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 (fSW)
⢠Cycle By Cycle Over Current Limit
⢠Auto-Skip Eco-mode⢠for High Efficiency at Light
Load
2 Applications
⢠Wide Range of Applications for Low Voltage
System
â Digital TV Power Supply
â High Definition Blu-ray Disc⢠Players
â Networking Home Terminal
â Digital Set Top Box (STB)
3 Description
The TPS54428 is an adaptive on-time D-CAP2â¢
mode synchronous buck converter.
Simplified Schematic
TPS54428DDA
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 8-pin DDA package
and 10-pin DRC packages, and is designed to
operate over the ambient temperature range of â40°C
to 85°C.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54428
SO PowerPAD (8)
VSON (10)
4.90 mm à 3.90 mm
3.00 mm à 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
1.05-V Load Transient Response
.
Vout(50mV/div)
Iout(2A/div)
100us/div
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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