TPS54226_15 Datasheet, PDF (1/31 Pages) Texas Instruments – 4.5V to 18V Input, 2-A Synchronous Step-Down SWIFTTM Converter with Eco-Mode™

TPS54226
www.ti.com
SLVSA14E – OCTOBER 2009 – REVISED JULY 2011
4.5V to 18V Input, 2-A Synchronous Step-Down SWIFT^TM Converter with Eco-Mode™
Check for Samples: TPS54226
FEATURES
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•23 D-CAP2™ Mode Enables Fast Transient
Response
• Low Output Ripple and Allows Ceramic Output
Capacitor
• Wide V_CC Input Voltage Range: 4.5 V to 18 V
• Wide V_IN 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)
• High Efficiency, less than 10 μA at shutdown
• Auto-Skip Eco-Mode™ for High Efficiency at
Light Load
• High Initial Bandgap Reference Accuracy
• Adjustable Soft Start
• Pre-Biased Soft Start
• 700-kHz Switching Frequency (f_SW)
• Cycle By Cycle Over Current Limit
• Power Good Output
• Auto-Skip Mode
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 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 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
Eco-Mode™ 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 or 16 pin QFN package, and
designed to operate from –40°C to 85°C.
V_OUT - 50 mA/div
I_OUT - 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, Eco-Mode, PowerPAD are trademarks 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 © 2009–2011, Texas Instruments Incorporated