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L6926

November 2004

1

FEATURES

■

2V TO 5.5V BATTERY INPUT RANGE

■

HIGH EFFICIENCY: UP TO 95%

■

INTERNAL SYNCHRONOUS SWITCH

■

NO EXTERNAL SCHOTTKY REQUIRED

■

EXTREMELY LOW QUIESCENT CURRENT

■

1

µA MAX SHUTDOWN SUPPLY 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

■

POWER GOOD SIGNAL

■

±1% OUTPUT VOLTAGE ACCURACY

■

CURRENT-MODE CONTROL

■

600kHz SWITCHING FREQUENCY

■

EXTERNALLY SYNCHRONIZABLE FROM

500kHz TO 1.4MHz

■

OVP

■

SHORT CIRCUIT PROTECTION

2

APPLICATIONS

■

BATTERY-POWERED EQUIPMENTS

■

PORTABLE INSTRUMENTS

■

CELLULAR PHONES

■

PDAs AND HAND HELD TERMINALS

■

DSC

■

GPS

3

DESCRIPTION

The device is dc-dc monolithic regulator specifically

designed to provide extremely high efficiency.

L6926 supply voltage can be as low as 2V allowing

its use in single Li-ion cell supplied applications. Out-

put 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-architec-

ture. Low Consumption Mode operation can be se-

lected at light load conditions, allowing switching

losses to be reduced. L6926 is externally synchroni-

zable with a clock which makes it useful in noise-sen-

sitive applications. Other features like Powergood,

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

R2

200K

R3

500K

R1

100K

RUN

COMP

GND

PGOOD

D01IN1305

7

6

1

8

3

5

24

Figure 1. Packages

Table 1. Order Codes

Part Number

Package

L6926

MSOP8 in Tube

L6926013TR

MSOP8 in Tape & Reel

L6926D1

VFSON-8 in Tube

L6926D1013TR

VFSON8 in Tape & Reel

VFSON8 (3x4.9x1mm)

MSOP8

Rev. 4