Texas Instruments - TPS62050, TPS62051, TPS62052, TPS62054, TPS62056 Data Handbook

TPS62050, TPS62051

www.ti.com TPS62052, TPS62054, TPS62056 SLVS432D–SEPTEMBER 2002–REVISED OCTOBER

800-m A SYNCHRONOUS STEP-DOWN CONVERTER

FEATURES DESCRIPTION High-Efficiency Synchronous Step-Down The TPS6205x devices are family of high-efficiency Converter With up to 95% Efficiency synchronous step-down dc/dc converters ideally suited 12-µA Quiescent Current (Typ) for systems powered from 1-cell or 2-cell Li-Ion

2.7-V to 10-V Operating Input Voltage Range battery or from 3-cell to 5-cell Ni Cd, Ni MH, or alkaline• battery.•

Adjustable Output Voltage Range From 0.7 to The TPS62050 is synchronous PWM converter with

Fixed Output Voltage Options Available in integrated N-channel and P-channel power MOSFET• V, 1.8 V, and 3.3 switches. Synchronous rectification increases ef-1.5 ficiency and reduces external component count. To•

Synchronizable to External Clock Signal up to

achieve highest efficiency over wide load current1.2

range, the converter enters power-saving•

High Efficiency Over Wide Load Current

pulse-frequency modulation (PFM) mode at light load

Range in Power-Save Mode

currents. Operating frequency is typically k Hz,

100% Maximum Duty Cycle for Lowest

allowing the use of small inductor and capacitor values.

Dropout

The device can be synchronized to an external clock

Low Noise Operation in Forced Fixed signal in the range of k Hz to 1.2 MHz. For low noise Frequency PWM Operation Mode operation, the converter can be programmed into

Internal Softstart forced-fixed frequency in PWM mode. In shutdown• mode, the current consumption is reduced to less than•

Overtemperature and Overcurrent Protected

µA. The TPS6205x is available in the 10-pin (DGS)

Available in 10-Pin Microsmall Outline

micro-small outline package (MSOP) and operates

Package MSOP ff ic ie cy

over an free air temperature range of -40°C to 85°C.

APPLICATIONS Cellular Phones Organizers, PDAs, and Handheld PCs Low Power DSP Supply Digital Cameras and Hard Disks

TYPICAL APPLICATION CIRCUIT TPS62050 EFFICIENCY vs

VO = 1.5 V / 800 m AL1 = 10 µHVI = 3.3 V to 10 V

OUTPUT CURRENT

VIN SW

EN FB

TPS62052

Ci = 10 µF

LBI PG

Co = 22 µF

SYNC LBO

GND PGND

VI = 7.2 V, VO = 5 V, SYNC = L

IO – Output Current – m A

MATHCAD is trademark of Mathsoft Incorporated. 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. PRODUCTION DATA information is current as of publication date. Copyright 2002–2003, Texas Instruments Incorporated Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily in- cludetestingofallparameters.