TPS54428_15 Datasheet, PDF (1/29 Pages) Texas Instruments – TPS54428 4.5-V to 18-V Input, 4-A Synchronous Step-Down Converter With Eco-Mode™

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TPS54428
SLVSB42C – NOVEMBER 2011 – REVISED OCTOBER 2015
TPS54428 4.5-V to 18-V Input, 4-A Synchronous Step-Down Converter With Eco-Mode™
1 Features
•1 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
2 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)
3 Description
The TPS54428 is an adaptive on-time D-CAP2™
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 –40°C
to 85°C.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS54428
HSOP (8)
VSON (10)
4.90 mm × 3.90 mm
3.00 mm × 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.