TPS54226
www.ti.com
SLVSA14A –OCTOBER 2009–REVISED OCTOBER 2009
TM
4.5V to 18V Input, 2-A Synchronous Step-Down SWIFT Converter with Light Load
Efficiency
Check for Samples: TPS54226
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FEATURES
DESCRIPTION
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D-CAP2™ Mode Enables Fast Transient
Response
The TPS54226 is a adaptive on-time D-CAP2™
mode synchronous buck converter. TheTPS54226
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
TPS54226 uses the D-CAP2™ mode control which
provides a very fast transient response with no
external compensation components. The adoptive
on-time control supports seamless operation between
PWM mode at heavy load condition and reduced
frequency operation at light load for high efficiency.
The TPS54226 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
VCC input, and from 2-V to 18-V VIN input power
supply voltage. The output voltage can be
programmed between 0.76 V and 5.5 V. The device
also features an adjustable slow start time and a
power good function. The TPS54226 is available in
the 14 pin HTSSOP package, and designed to
operate from –40°C to 85°C.
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Low Output Ripple and Allows Ceramic Output
Capacitor
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Wide VCC Input Voltage Range: 4.5 V to 18 V
Wide VIN Input Voltage Range: 2 V to 18 V
Output Voltage Range: 0.76 V to 5.5 V
Highly Efficient Integrated FET’s Optimized
for Lower Duty Cycle Applications
– 160 mΩ (High Side) and 110 mΩ (Low Side)
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High Efficiency, less than 10 μA at shutdown
High Initial Bandgap Reference Accuracy
Adjustable Soft Start
Pre-Biased Soft Start
700-kHz Switching Frequency (fSW
)
Cycle By Cycle Over Current Limit
Power Good Output
Auto-Skip Mode
APPLICATIONS
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Wide Range of Applications for Low Voltage
System
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Digital TV Power Supply
High Definition Blu-ray Disc™ Players
Networking Home Terminal
Digital Set Top Box (STB)
V
- 50 mA/div
OUT
I
- 1 A/div
OUT
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.
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D-CAP2, PowerPAD are trademarks of Texas Instruments.
Blu-ray Disc is a trademark of Blu-ray Disc Association.
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 © 2009, Texas Instruments Incorporated