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Microsemi Corporation - VOLTAGE - MODE PWM CONTROLLERS

Numéro de référence LX1681CDM
Description VOLTAGE - MODE PWM CONTROLLERS
Fabricant Microsemi Corporation 
Logo Microsemi Corporation 





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LX1681CDM fiche technique
T H E I N F I N I T E P O W E R O F I N N O VAT I O N
LX1681/1682
VOLTAGE-MODE PWM CONTROLLERS
PRODUCTION DATA SHEET
DESCRIPTION
The LX1681/1682 are monolithic, pulse-
width modulator controller ICs. They are
designed to implement a flexible, low cost
buck (step-down) regulator supply with mini-
mal external components.
The LX1681 is a non-synchronous con-
troller; the LX1682 has a synchronous driver
for higher efficiency.
The output voltage is adjustable by
means of a resistor divider to set the voltage
between 1.25V and 4.5V.
Short-circuit current limiting can be
implemented without expensive current
sense resistors. Current is sensed using the
voltage drop across the RDS(ON) of the MOSFET
— sensing is delayed for 1µs to eliminate
MOSFET ringing errors.
Hiccup-mode fault protection reduces
average power to the power elements during
short-circuit conditions.
Switching frequency is fixed at 200kHz
for optimal cost and space.
Under-voltage lockout and soft-start
for optimal start-up performance. The
LX1681/82 can be disabled by pulling the soft-
start pin to ground.
Small 8-pin SOIC packaging reduces
board space.
Optimized for 5V-to-3.3V or 5V-to-2.5V
conversion, the LX1681/82 can also be used
for converting 12V to 5V, 3.3V or other
voltages with high efficiency, eliminating the
need for bulky heat sinks.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
KEY FEATURES
s Fixed 200kHz Switching Frequency
s Constant Frequency Voltage-Mode Control
Requires NO External Compensation
s Hiccup-Mode Over-Current Protection
s High Efficiency
s Output Voltage Set By Resistor Divider
s Under-Voltage Lockout
s Soft-Start And Enable
s Synchronous Rectification (LX1682)
s Non-Synchronous Rectification (LX1681)
s Small, 8-pin Surface Mount Package
A P P L I C AT I O N S
s 5V to 3.3V Or Less Buck Regulators
s FPGA Supplies
s Microprocessor Chipset Supplies
(e.g. Camino, Whitney, etc.)
s Rambus® RIMMTM Supplies
s Hard Disk Drives
s Computer Add-on Cards
VBOOST
12V
PRODUCT HIGHLIGHT
VIN
5V
VBOOST
12V
VIN
5V
C3
1µF
1 VFB
CSS
2 SS
VCC 8
CS 7
0.1µF
LX1681
3 N.C.
VC1 6
4 GND
TDRV 5
C1
1500µFx3
Q1
IRL3103S
L1 C2
5µH 1500µF
x3
RSET
D2
MBR2545
VOUT
R1
R2
C3
1µF
1 VFB
CSS
2 SS
VCC 8
CS 7
0.1µF
LX1682
3 GND
VC1 6
4 BDRV
TDRV 5
C1
1500µFx2
Q1
IRL3103S
L1 C2
5µH 1500µF
x3
RSET
Q2
IRL3103S
VOUT
R1
R2
LX1681 NON-SYNCHRONOUS CONTROLLER
LX1682 SYNCHRONOUS CONTROLLER
Copyright © 1999
Rev. 1.0 5/99
PA C K A G E O R D E R I N F O R M AT I O N
TA (°C)
Output
DM
Plastic
8-pin
SOIC
0 to 70
Non-Synchronous
Synchronous
LX1681CDM
LX1682CDM
Note: All surface-mount packages are available in Tape & Reel,
append the letter "T" to part number. (i.e. LX1681CDMT)
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1

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