L6928D(2005) Просмотр технического описания (PDF) - STMicroelectronics
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L6928D Datasheet PDF : 9 Pages
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L6928D
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
■ 1.4MHz SWITCHING FREQUENCY
■ EXTERNALLY SYNCHRONIZABLE FROM
1MHz TO 2MHz
■ 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
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
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