SC4517A
SC4517A is 1.5A Step-Down Switching Regulator manufactured by SEMTECH.
Description
The SC4517A is a current mode switching regulator with an integrated switch, operating at 1.25MHz with separate sync & enable functions. The integrated switch allows for cost effective low power solutions (peak switch current 1.5 amps). The sync function allows customers to synchronize to a faster clock in order to avoid frequency beating in noise sensitive applications. High frequency of operation allows for very small passive ponents. Current mode operation allows for fast dynamic response .. & instantaneous duty cycle adjustment as the input varies (ideal for CPE applications where the input is a wall plug power). applications where battery life is important.
Features
Integrated 1.5 Amp switch 1.25MHz frequency of operation Current mode controller Synchronizable to higher frequency up to 2MHz 6µA low shutdown current MSOP-8 and MLPD-8 Lead-free packages. This product is fully WEEE and Ro HS pliant
Applications
XDSL modems CPE equipment DC-DC point of load applications Portable equipment
The low shutdown current makes it ideal for portable
The SC4517A is a 1.25MHz switching regulator synchronizable to a faster frequency from 1.6MHz to 2MHz.
Typical Application Circuit
D1
1 VIN Enable C3 2 5 8 BST IN SW 3 6 7
C1 L1 VOUT R1
SC4517AXX
EN SYNC FB P
GND 4
D2 R2
C2
C4
R3
Revision: December 13, 2006
.semtech.
POWER MANAGEMENT Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability.
Parameter Input Supply Voltage
(1)
Symbol VIN (VBST
- VSW) V BST V EN V FB IFB ISYNC θJ A TA TJ TSTG TLEAD TPKG ESD
Limits -0.3 to +24 16 -0.3 to +32 -0.3 to +16 -0.3 to +6 1 1 185 53 -40 to +85 -40 to +150 -65 to +150 300 260 2
Units V V V V V m...
