|
L6928D Datasheet, PDF (1/9 Pages) STMicroelectronics – HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR | |||
|
L6928D
HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS
STEP DOWN REGULATOR
1 FEATURES
â 2V TO 5.5V BATTERY INPUT RANGE
â HIGH EFFICIENCY: UP TO 95%
â INTERNAL SYNCHRONOUS SWITCH
â NO EXTERNAL SCHOTTKY REQUIRED
â EXTREMELY LOW QUIESCENT CURRENT
â 1µA MAX SHUTDOWN SUPPLY CURRENT
â 800mA MAX OUTPUT CURRENT
â ADJUSTABLE OUTPUT VOLTAGE FROM 0.6V
â LOW DROP-OUT OPERATION: UP TO100%
DUTY CYCLE
â SELECTABLE LOW NOISE/LOW
CONSUMPTION MODE AT LIGHT LOAD
â POWER GOOD SIGNAL
â ±1% OUTPUT VOLTAGE ACCURACY
â CURRENT-MODE CONTROL
â 1.4MHz SWITCHING FREQUENCY
â EXTERNALLY SYNCHRONIZABLE FROM
1MHz TO 2MHz
â OVP
â SHORT CIRCUIT PROTECTION
2 APPLICATIONS
â BATTERY-POWERED EQUIPMENTS
â PORTABLE INSTRUMENTS
â CELLULAR PHONES
â PDAs AND HAND HELD TERMINALS
â DSC
â GPS
Figure 2. Application Test Circuit
Figure 1. Packages
MSOP8
Table 1. Order Codes
Part Number
L6928D
L6928D013TR
Package
MSOP8 in Tube
MSOP8 in Tape & Reel
3 DESCRIPTION
The device is dc-dc monolithic regulator specifically
designed to provide extremely high efficiency.
L6928D 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 1.4MHz fixed-frequency, current mode-architec-
ture. Low Consumption Mode operation can be se-
lected at light load conditions, allowing switching
losses to be reduced. L6928D is externally synchro-
nizable with a clock which makes it useful in noise-
sensitive applications. Other features like Power-
good, Overvoltage protection, Shortcircuit protection
and Thermal Shutdown (150°C) are also present.
VIN=2V to 5.5V
C1
10µF
6.3V
SYNC
7
VCC
6
RUN
1
2
COMP
D01IN1528
C2
220pF
L 4.7µH
5
LX
R3
500K
8
PGOOD
3
4
VFB
GND
R2
200K
R1
100K
VOUT=1.8V
C4
10µF
6.3V
February 2005
Rev. 2
1/9
|
▷ |