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1FEATURES

2· High-Efficiency Synchronous Step-Down

Converter With up to 95% Efficiency

· 2.5-V to 6-V Input Voltage Range

· Adjustable Output Voltage Range From 0.7 V

to V I

· Fixed Output Voltage Options Available

· Up to 400-mA Output Current

· 1.25-MHz Fixed Frequency PWM Operation

· Highest Efficiency Over Wide Load Current

Range Due to Power-Save Mode

· 15 mA Typical Quiescent Current

· Soft Start

· 100% Duty Cycle Low-Dropout Operation

· Dynamic Output-Voltage Positioning

· Available in TSOT23 Package

APPLICATIONS

· PDAs and Pocket PC

· Cellular Phones, Smart Phones

· OMAP? and Low Power DSP Supply

· Digital Cameras

· Portable Media Players

· Portable Equipment

· WLAN PC Cards

DESCRIPTION

The TPS6222x devices are a family of high-efficiency,

synchronous step-down converters ideally suited for

portable systems powered by 1-cell Li-Ion or 3-cell

NiMH/NiCd batteries. The devices are also suitable to

operate from a standard 3.3-V or 5-V voltage rail.

With an output voltage range of 6 V down to 0.7 V and up to 400-mA output current, the devices are

ideal for powering the low voltage TMS320? DSP

family and processors used in PDAs, pocket PCs,

and smart phones. Under nominal load current, the

devices operate with a fixed switching frequency of typically 1.25 MHz. At light load currents, the part

enters the power-save mode operation; the switching

frequency is reduced and the quiescent current is

typically only 15 mA; therefore, the device achieves the highest efficiency over the entire load current

range. The TPS6222x needs only three small

external components. Together with the tiny TSOT23

package, a minimum system solution size can be

achieved. An advanced fast response voltage mode

control scheme achieves superior line and load regulation with small ceramic input and output

capacitors.