L6926 Datasheet, PDF (1/11 Pages) STMicroelectronics – HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR

L6926
HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS
STEP DOWN REGULATOR
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
■ 1µA 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
Figure 2. Application Test Circuit
Figure 1. Packages
MSOP8
VFSON8 (3x4.9x1mm)
Table 1. Order Codes
Part Number
L6926
L6926013TR
L6926D1
L6926D1013TR
Package
MSOP8 in Tube
MSOP8 in Tape & Reel
VFSON-8 in Tube
VFSON8 in Tape & Reel
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.
V_IN=2V to 5.5V
C1
10µF
6.3V
SYNC
7
V_CC
6
RUN
1
2
COMP
D01IN1305
C2
220pF
L 6.8µH
5
LX
R3
500K
8
PGOOD
3
4
VFB
GND
R2
200K
R1
100K
November 2004
V_OUT=1.8V
C4
10µF
6.3V
Rev. 4
1/11