1 A Synchronous Switching Regulator - Semtech Corporation
Description
1 A Synchronous Switching Regulator
June 28, 2000
SC1409
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.
semtech.
com
DESCRIPTION
The SC1409 is a versatile, voltage-mode switching regulator designed for use in battery operated power supply applications.
A simple, fixed-voltage buck regulator can be implemented using the SC1409 with a minimum of external components.
Internal MOSFETs and control circuitry minimize board space and design time.
The small device footprint allows for compact circuit design.
SC1409 features include a temperature compensated voltage reference, triangle wave oscillator, hiccup mode current limit, an internally compensated error amplifier, overcurrent temperature protection, soft start, and under voltage lock out.
The SC1409 operates at a selectable, fixed frequency of 300kHz or 500kHz, or can be synchronized to an external clock within this range, providing an optimum compromise between efficiency, external component size, and cost.
FEATURES •= Internal MOSFETs •= Excellent efficiency >88% •= 1% Voltage accuracy •= Built-in over current protection •= 1A Output current •= 5µA Standby current •= Industrial temperature range •= 300kHz/500kHz selectable frequency APPLICATIONS •= Handheld equipment •= PDA power supplies •= Notebook I/O power supplies •= Peripheral card supplies •= High density DC/DC conversion ORDERING INFORMATION
DEVICE
(1)
PACKAGE SO-8
SC1409ISTR
Note: (1) Only available in tape and reel packaging.
A reel contains 2500 devices.
APPLICATION CIRCUIT
Vin=5V
R1 OPEN U1 1 2
Vout 3.
45V 3.
30V 3.
10V 2.
90V 2.
80V 2.
50V 1.
50V R3 1.
87k 1.
74k 1.
58k 1.
40k 1.
33k 1.
07k 249 R4 1.
00k 1.
00k 1.
00k 1.
00k 1.
00k 1.
00k 1.
00k
C6 0.
1uF
SYNC/FSET EN/SS AGND FB SC1409IS
ISET VIN
8 7 6 L1 5 R2 100uH Vout
3 4 + C1 47uF/16V C3 0.
033uF
PHASE PGND
+ C2 47uF/16V R4
1 © 2000 SEMTECH CORP.
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 A Synchronous Switching Regulator
June 28, 2000
SC1409
ABSOLUTE MAXIMUM RATINGS
Parameter Supply Voltage Ground Di...
Similar Datasheet
