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L6926Q1TR Datasheet(PDF) 1 Page - STMicroelectronics

Part # L6926Q1TR
Description  High efficiency monolithic synchronous step down regulator
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6926Q1TR Datasheet(HTML) 1 Page - STMicroelectronics

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September 2008
Rev 8
1/16
16
L6926
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 mA max shutdown supply current
800 mA max output current
Adjustable output voltage from 0.6 V
Low drop-out 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
600 kHz switching frequency
Externally synchronizable
from 500 kHz to 1.4 MHz
OVP
Short circuit protection
Applications
Battery-powered equipments
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.
L6926 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
drop-out operation.
The device is based on a 600 kHz fixed-
frequency, current mode-architecture.
Low consumption mode operation can be
selected at light load conditions, allowing
switching losses to be reduced. L6926 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.
MSOP8
VFQFPN8
(3x3x1.0 mm)
Figure 1.
Application test circuit
L 6.8
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
D01IN1305
7
6
1
8
3
5
24
www.st.com


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