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L6928 Datasheet, PDF (1/16 Pages) STMicroelectronics – High efficiency monolithic synchronous step down regulator | |||
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L6928
High efficiency monolithic synchronous step down regulator
General 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 to 100% 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
Applications
â Battery-powered equipments
â Portable instruments
â Cellular phones
â PDAs and hand held terminals
â DSC
â GPS
Application test circuit
MSOP8
VFQFPN8
Description
The device is dc-dc monolithic regulator
specifically designed to provide extremely high
efficiency.
L6928 supply voltage can be as low as 2V
allowing its use in single Li-ion cell supplied
applications. Output voltage can be selected by
an external divider down to 0.6V. Duty Cycle can
saturate to 100% allowing low drop-out operation.
The device is based on a 1.4MHz fixed-frequency,
current mode-architecture.
Low Consumption Mode operation can be
selected at light load conditions, allowing
switching losses to be reduced. L6928 is
externally synchronizable with a clock which
makes it useful in noise-sensitive applications.
Other features like Powergood, Overvoltage
protection, Shortcircuit protection and Thermal
Shutdown (150°C) are also present.
October 2006
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
Rev 4
R2
200K
R1
100K
VOUT=1.8V
C4
10µF
6.3V
1/16
www.st.com
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