L6926_06 Datasheet, PDF (1/17 Pages) STMicroelectronics – High efficiency monolithic synchronous step down regulator

L6926
High efficiency monolithic synchronous step down regulator
General features
■ 2V to 5.5V battery input range
■ High efficiency: up to 95%
■ Internal synchronous switch
■ No external schottky required
■ Extremely low quiescent current
■ 1mA max shutdown supply current
■ 800mA max output current
■ Adjustable output voltage from 0.6V
■ 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
■ 600kHz switching frequency
■ Externally synchronizable
from 500kHz to 1.4MHz
■ OVP
■ Short circuit protection
Applications
■ Battery-powered equipments
■ Portable instruments
■ Cellular phones
■ PDAs and hand held terminals
■ DSC
■ GPS
Application test circuit
MSOP8
VFSON8
VFQFPN8
(3x4.9x1mm) ^(3x3x1.0mm)
Description
The device is dc-dc monolithic regulator
specifically designed to provide extremely high
efficiency.
L6926 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 600kHz 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.
October 2006
V_IN=2V to 5.5V
C1
10µF
6.3V
SYNC
7
V_CC
6
RUN
1
2
COMP
D01IN1305
C2
220pF
L 6.8µH
5
LX
R3
500K
8
PGOOD
3
4
VFB
GND
Rev 7
R2
200K
R1
100K
V_OUT=1.8V
C4
10µF
6.3V
1/17
www.st.com
17