Texas Instruments - TPS64200 Data Sheet

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SLVS485 − AUGUST 2003

FEATURES Low Power DSP Supply Digital Cameras

Step-Down Controller for Applications With

up to 95% Efficiency Hard Disk Drives 1.8-V to 6.5-V Operating Input Voltage Range Portable Audio Players

Adjustable Output Voltage Range From 1.2 V

to VI DESCRIPTION

High Efficiency Over a Wide Load Current

The TPS6420x are nonsynchronous step-down

Range

controllers that are ideally suited for systems powered

100% Maximum Duty Cycle for Lowest from a 5-V or 3.3-V bus or for applications powered from

Dropout a 1-cell Li-Ion battery or from a 2- to 4-cell Ni Cd, Ni MH, or alkaline battery. These step-down controllers drive an

Internal Softstart

external P-channel MOSFET allowing design flexibility. To

20-µA Quiescent Current (Typical)

achieve highest efficiency over a wide load current range, Overcurrent Protected this controller uses a minimum on time, minimum off time

ff ic ie cy

control scheme and consumes only 20-µA quiescent

Available in a SOT23 Package

current. The minimum on time of typically 600 ns (TPS64203) allows the use of small inductors and

APPLICATIONS capacitors. When disabled, the current consumption is

reduced to less than 1 µA. The TPS6420x is available in

USB Powered Peripherals

the 6-pin SOT23 (DBV) package and operates over a free

Organizers, PDAs, and Handheld PCs air temperature range of −40°C to 85°C.

TYPICAL APPLICATION CIRCUIT

TPS64200 EFFICIENCY vs

LOAD CURRENT

Rs = 33 mΩ

TPS64200 EN SW Si5447DC GND VIN VI = 4.2 V

FB ISENSE 3.3 V / 2 A

ZHCS2000

47 µF Pos Cap

6TPA47M

TA = 25°C, VO = 3.3 V

IO − Load Current − A

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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