L6925D013TR datasheet(1/6 Pages) STMICROELECTRONICS

Teilenummer	L6925D013TR

Bauteilbeschribung	HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR

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Hersteller	STMICROELECTRONICS [STMicroelectronics]

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L6925D

September 2004

1FEATURES

■

2.7V TO 5.5V BATTERY INPUT RANGE

■

HIGH EFFICIENCY: UP TO 95%

■

INTERNAL SYNCHRONOUS SWITCH

■

NO EXTERNAL SCHOTTKY REQUIRED

■

EXTREMELY LOW QUIESCENT CURRENT

■

800mA MAX OUTPUT CURRENT

■

ADJUSTABLE OUTPUT VOLTAGE FROM 0.6V

■

LOW DROP-OUT OPERATION: UP TO100%

DUTY CYCLE

■

SELECTABLE LOW NOISE/LOW

CONSUMPTION MODE AT LIGHT LOAD

■

LOW BATTERY INPUT

■

LOW BATTERY OUTPUT

■

±1% OUTPUT VOLTAGE ACCURACY

■

CURRENT-MODE CONTROL

■

600kHz SWITCHING FREQUENCY

■

EXTERNALLY SYNCHRONIZABLE FROM

500kHz TO 1.4MHz

■

OVP

■

SHORT CIRCUIT PROTECTION

1.1 APPLICATIONS

■

BATTERY-POWERED EQUIPMENTS

■

PORTABLE INSTRUMENTS

■

CELLULAR PHONES

■

PDAs AND HAND HELD TERMINALS

■

DSC

■

GPS

2DESCRIPTION

The device is dc-dc monolithic regulator specifically

designed to provide extremely high efficiency.

The device has on UVLO set at 2.7V cause it is part-

icurarly thought for single Li-ion cell applications.

Output voltage can be selected by an external divider

down to 0.6V. Duty Cycle can saturate to 100% al-

lowing low drop-out operation.

The device is based on a 600kHz fixed-frequency,

current mode-architecture. Low Consumption Mode

operation can be selected at light load conditions, al-

lowing switching losses to be reduced. L6925D is ex-

ternally synchronizable with a clock which makes it

useful in noise-sensitive applications.

LBI pin can be used to have a LBO signal when the

Battery voltage is lower than a preset value. Other

features like, Overvoltage protection, Shortcircuit

protection and Thermal Shutdown (150°C) are also

present.

HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS

STEP DOWN REGULATOR

Figure 2. Application Test Circuit

L 6.8

µH

SYNC

LX

VFB

C1

10

µF

6.3V

C2

220pF

C4

10

µF

6.3V

R4

200K

R2

600K

R1

100K

R3

100K

VIN=2.7V to 5.5V

VOUT=1.8V

VCC

LBI

COMP

GND

LBO

D01IN1238B

7

6

1

8

3

5

24

Rev. 3

Figure 1. Package

Table 1. Order Codes

Part Number

Package

L6925D

MSOP8 (Tube)

L6925D013TR

Tape & Reel

MSOP8

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