V

-50mA/div

OUT

I

-1 A/div

OUT

100

s/div

m

TPS54226

www.ti.com

SLVSA14E

– OCTOBER 2009 – REVISED JULY 2011

™

Check for Samples: TPS54226

1

FEATURES

APPLICATIONS

23

•

D-CAP2

™ Mode Enables Fast Transient

•

Wide Range of Applications for Low Voltage

Response

System

•

Low Output Ripple and Allows Ceramic Output

– Digital TV Power Supply

Capacitor

– High Definition Blu-ray Disc™ Players

•

– Networking Home Terminal

•

– Digital Set Top Box (STB)

•

Output Voltage Range: 0.76 V to 5.5 V

DESCRIPTION

•

Highly Efficient Integrated FET

’s Optimized

The TPS54226 is a adaptive on-time D-CAP2

™

for Lower Duty Cycle Applications

mode synchronous buck converter. TheTPS54226

– 160 mΩ (High Side) and 110 mΩ (Low Side)

enables system designers to complete the suite of

•

High Efficiency, less than 10

μA at shutdown

various end equipment

’s power bus regulators with a

•

Auto-Skip Eco-Mode

™ for High Efficiency at

cost effective, low component count, low standby

Light Load

current solution. The main control loop for the

TPS54226 uses the D-CAP2

™ mode control which

•

High Initial Bandgap Reference Accuracy

provides a fast transient response with no external

•

Adjustable Soft Start

compensation components. The adoptive on-time

•

Pre-Biased Soft Start

control supports seamless operation between PWM

mode at heavy load condition and reduced frequency

•

Eco-Mode

™ operation at light load for high efficiency.

•

Cycle By Cycle Over Current Limit

The TPS54226 also has a proprietary circuit that

•

Power Good Output

enables the device to adopt to both low equivalent

series resistance (ESR) output capacitors, such as

•

Auto-Skip Mode

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.

1

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.

2

D-CAP2, Eco-Mode, PowerPAD are trademarks of Texas Instruments.

3

Blu-ray Disc is a trademark of Blu-ray Disc Association.

PRODUCTION DATA information is current as of publication date.

Copyright

© 2009–2011, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.