TPS62228DDCR.B中文资料德州仪器数据手册PDF规格书

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.