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| LX2172 Datasheet, PDF (1/6 Pages) Microsemi Corporation – 1.25A HIGH-EFFICIENCY 100KHZ SWITCHING REGULATOR | |||
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THE INFINITE POWER OF INNOVATION
LX2172 / 73
1.25A HIGH-EFFICIENCY 100KHZ SWITCHING REGULATOR
PRELIMINARY DATA SHEET
DESCRIPTION
The LX2172/73 are fixed-frequency, boost and flyback applications, but can
current-mode switching regulator integrated also be used in forward and inverting
circuits. These ICs contain all necessary converter configuations.
control circuitry plus a 1.25A on-board The LX2172 can be connected to an
transistor to design a complete DC:DC external clock for synchronization, and can
switching regulator with minimum external enter micropower operation when the VC
components.
pin is pulled low. The LX2173 has an
All functions are integrated into a single enable function, which permits extremely
IC, available in 8-pin DIP and SOIC or a 5- low micropower operation, consuming
pin TO-220 power package, making them under 10µA current when the ENABLE
extremely easy to design with and use. The pin is brought low
LX2172/73 are optimized for
IMPORTANT: For the most current data, consult MICROSEMIâs website: http://www.microsemi.com
PRODUCT HIGHLIGHT
SEPIC C ONVER TER U SING THE LX2172
Input 6-24V, Output 7V, 300mA
VIN
6-24V DC
C1
22 µF
C3
0.1 µF
R1
13.7k
C4
0.47 µF
U1
1 GND
2 VC
3 FB
4 SYNC
L1
1mH
E2 8
VSW 7
E1 6
VIN 5
C2
330 µF D1
7V
1N5817
COUT
220 µF
L2
1mH
Output
7V
300mA
R2
3.0k
(See Note 1)
R3
100
CDECOUPLE
0.47 µF
KEY FEATURES
 1.25A, 65V Internal Power
Switch
 3V - 25V Input Voltage Range
 Current-Mode Operation
 Improved Internal Cycle-By-
Cycle Current Limiting
 Thermal Shutdown
 Less Than 10µA Quiescent
Current In Microprocessor
Shutdown Mode
 External Frequency
Synchronization Possible
 100kHz Operating Frequency
APPLICATIONS
 Boost Converter
 Laptop / Notebook Computers
 Portable Equipment
 Small Motor Applications
 Flyback Converters
Part #
LX2172
LX2173
Pin 4 Connection
SYNC Input
Low µPower Mode
(Hi ENABLE)
Note 1: SYNC Pin Requirements:
A) FMAX = 200kHz
B) TTL Compatible Level
C) Pulse Width TP Range - 0.1µs < TP < 2.0µs
TA (°C)
0 to 70
PACKAGE ORDER INFO
Plastic DIP
M 8-Pin
Plastic SOIC
DM 8-Pin
RoHS Compliant / Pb-free
Transition DC: 0503
RoHS Compliant / Pb-free
Transition DC: 0440
LX217xCM
LX217xCDM
Plastic TO-220
P 5-Pin
LX217xCP
Note: Available in Tape & Reel. Append the letters âTRâ to the part number. (i.e. LX2172CDM-TR)
Copyright © 1998
Rev. 0.4a ,2005-03-09
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
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