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L6928D Datasheet(PDF) 1 Page - STMicroelectronics

Part # L6928D
Description  High efficiency monolithic synchronous step down regulator
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6928D Datasheet(HTML) 1 Page - STMicroelectronics

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April 2011
Doc ID 11051 Rev 6
1/16
16
L6928
High efficiency monolithic synchronous step down regulator
Features
2 V to 5.5 V 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
800 mA max output current
Adjustable output voltage from 0.6 V
Low dropout operation: up to 100% duty cycle
Selectable low noise/low consumption mode at
light load
Power Good signal
± 1% output voltage accuracy
Current-mode control
1.4 MHz switching frequency
Externally synchronizable from 1 MHz to 2
MHz
OVP
Short-circuit protection
Applications
Battery-powered equipment
Portable instruments
Cellular phones
PDAs and hand held terminals
DSC
GPS
Description
The device is DC-DC monolithic regulator
specifically designed to provide extremely high
efficiency. L6928 supply voltage can be as low as
2 V allowing its use in single Li-Ion cell supplied
applications. Output voltage can be selected by
an external divider down to 0.6 V. Duty cycle can
saturate to 100% allowing low dropout operation.
The device is based on a 1.4 MHz 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 Power
Good, overvoltage protection, short-circuit
protection and thermal shutdown (150 °C) are
also present.
VFQFPN8
MSOP8
(3x3x1.0 mm)
Figure 1.
Application test circuit
L 4.7
μH
SYNC
LX
VFB
C1
10
μF
6.3V
C2
220pF
C4
10
μF
6.3V
R2
200K
R3
500K
R1
100K
VIN=2V to 5.5V
VOUT=1.8V
VCC
RUN
COMP
GND
PGOOD
D01IN1528
7
6
1
8
3
5
24
www.st.com


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