L6925 STMicroelectronics, L6925 Datasheet

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L6925

Manufacturer Part Number
L6925
Description
HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS STEP DOWN REGULATOR
Manufacturer
STMicroelectronics
Datasheet

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L6925
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L6925013TR
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Part Number:
L6925D
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L6925D013TR
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APPLICATIONS
APPLICATION TEST CIRCUIT
September 2003
2.7V TO 5.5V BATTERY INPUT RANGE
HIGH EFFICIENCY: UP TO 95%
INTERNAL SYNCHRONOUS SWITCH
NO EXTERNAL SCHOTTKY REQUIRED
EXTREMELY LOW QUIESCENT 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
LOW BATTERY INPUT
LOW BATTERY OUTPUT
±1% OUTPUT VOLTAGE ACCURACY
CURRENT-MODE CONTROL
600kHz SWITCHING FREQUENCY
EXTERNALLY SYNCHRONIZABLE FROM
500kHz TO 1.4MHz
OVP
SHORT CIRCUIT PROTECTION
BATTERY-POWERED EQUIPMENTS
PORTABLE INSTRUMENTS
CELLULAR PHONES
PDAs AND HAND HELD TERMINALS
DSC
GPS
V
HIGH EFFICIENCY MONOLITHIC SYNCHRONOUS
IN
=2.7V to 5.5V
10 F
6.3V
C1
600K
100K
D01IN1238B
R2
R1
SYNC
LBO
V
LBI
CC
COMP
7
6
1
8
2
220pF
C2
DESCRIPTION
The device is dc-dc monolithic regulator specifically
designed to provide extremely high efficiency.
The device has on UVLO set at 2.7V cause it is part-
icurarly thought for single Li-ion cell applications.
Output 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 600kHz fixed-frequency, current mode-architec-
ture. Low Consumption Mode operation can be se-
lected at light load conditions, allowing switching
losses to be reduced. L6925D is externally synchro-
nizable with a clock which makes it useful in noise-
sensitive applications. LBI pin can be used to have a
LBO signal when the Battery voltage is lower than a
preset value. Other features like, Overvoltage protec-
tion, Shortcircuit protection and Thermal Shutdown
(150°C) are also present.
ORDERING NUMBERS: L6925D (Tube)
4
STEP DOWN REGULATOR
GND
5
3
LX
VFB
L 6.8 H
200K
100K
R4
R3
MSOP8
L6925013TR (Tape & Reel)
V
OUT
10 F
=1.8V
6.3V
C4
L6925D
1/5

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L6925 Summary of contents

Page 1

... Low Consumption Mode operation can be se- lected at light load conditions, allowing switching losses to be reduced. L6925D is externally synchro- nizable with a clock which makes it useful in noise- sensitive applications. LBI pin can be used to have a LBO signal when the Battery voltage is lower than a preset value ...

Page 2

... L6925D ABSOLUTE MAXIMUM RATINGS Symbol V Input voltage 6 V Output switching voltage 5 V Shutdown 1 V Feedback voltage 3 V Analog input voltage 2 P Power dissipation at Tamb=70 C tot T Junction operating temperature range j T Storage temperature range stg LX Pin Maximum Withstanding Voltage Range Test Condition: CDF- AEC-Q100-002- “ ...

Page 3

... V > 0. < 2.7V, V > 0. < 2.7V < 2.7V 0. 1mA 3.6V, sink cc V < 0.6V LBI V = 3.6V 3.6V, LBO cc V > 0.6V LBI L6925D Min Typ Max Unit 2.7 5.5 V 2.8 V 2.65 V 150 mV 240 m 215 m 1.2 A 1.4 A 0.6 Vcc V 600 KHz 500 1400 KHz 230 25 0 0.593 0.6 0.607 V ...

Page 4

... L6925D mm DIM. MIN. TYP. MAX. A 1.10 A1 0.050 0.150 0.002 A2 0.750 0.850 0.950 b 0.250 0.400 0.010 c 0.130 0.230 0.005 D (1) 2.900 3.000 3.100 0.114 E 4.650 4.900 5.150 0.183 E1 (1) 2.900 3.000 3.100 0.114 e 0.650 L 0.400 0.550 0.700 0.016 L1 0.950 k 0˚ (min.) 6˚ (max.) aaa 0 ...

Page 5

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