TPS54228_16 Datasheet, PDF (1/29 Pages) Texas Instruments – 4.5-V to 18-V Input, 2-A Synchronous Step-Down Converter With Eco-Mode

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TPS54228
SLVSAU1E – MAY 2011 – REVISED AUGUST 2016
TPS54228 4.5-V to 18-V Input, 2-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 V
• Highly Efficient Integrated FETs Optimized
for Lower Duty Cycle Applications
– 155 mΩ (High-Side) and 108 mΩ (Low-Side)
• High Efficiency, Less than 10 µA at Shutdown
• High Initial Bandgap Reference Accuracy
• Adjustable Soft Start
• Prebiased Soft Start
• 700-kHz Switching Frequency (f_SW)
• Cycle-by-Cycle Overcurrent 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 Terminals
– Digital Set Top Boxes (STB)
3 Description
The TPS54228 device is an adaptive on-time D-
CAP2™ mode synchronous buck converter. The
TPS54228 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 TPS54228 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
TPS54228 to maintain high efficiency during lighter
load conditions. The TPS54228 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 V. The device
also features an adjustable soft start time. The
TPS54228 is available in 8-pin SO , 8-pin SOIC, and
10-pin VSON 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)
HSOP (8)
4.89 mm × 3.90 mm
TPS54228
SOIC (8)
4.89 mm × 3.90 mm
VSON (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
TPS54228 Transient Response
TPS54228
Vout (50 mV/div)
Copyright © 2016, Texas Instruments Incorporated
Iout (1 A/div)
t - Time - 100 ms
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.