TPS54227 Datasheet, PDF (1/19 Pages) Texas Instruments – 4.5V to 18V Input, 2-A SYNCHRONOUS STEP DOWN SWIFT

TPS54227
www.ti.com
SLVSAU2 – MAY 2011
4.5V to 18V Input, 2-A SYNCHRONOUS STEP DOWN (SWIFT^TM )
CONVERTER
Check for Samples: TPS54227
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
– 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
• Pre-Biased Soft Start
• 700-kHz Switching Frequency (f_SW)
• Cycle By Cycle Over Current Limit
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 TPS54227 is an adaptive on-time D-CAP2™
mode synchronous buck converter. TheTPS54227
enables system designers to complete the suite of
various end equipment’s power bus regulators with a
cost effective, low component count, low standby
current solution. The main control loop for the
TPS54227 uses the D-CAP2™ mode control which
provides a fast transient response with no external
compensation components. The TPS54227 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 TPS54227 is available in the 8-pin DDA
package, and designed to operate from –40°C to
85°C.
TPS54227DDA
Vout (50 mV/div)
Iout (1 A/div)
100 ms/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, Texas Instruments Incorporated