SC4519
SC4519 is 3A Step-Down Switching Regulator manufactured by SEMTECH.
Description
The SC4519 is a current mode switching regulator with an integrated switch, operating at 600k Hz with separate sync and enable functions. The integrated switch allows for cost effective low power solutions (peak switch current 3 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 .. and 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 3 Amp switch 600k Hz frequency of operation Current mode controller Synchronizable to higher frequency up to 1.2MHz 6µA low shutdown current SOIC-8L-EDP Lead-free package. 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 SC4519 is a 600k Hz switching regulator synchronizable to a faster frequency from 750k Hz to 1.2MHz.
Typical Application Circuit
D1
1 VIN Enable C3 2 5 8 BST IN SW 3 6 7
C1 L1 VOUT R1
EN SYNC FB P
GND 4
D2 R2
C2
C4
R3
Revision: April 18, 2007
.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 Boost Pin Above VSW Boost Pin Voltage EN Pin Voltage
..
Symbol VIN (VBST
- VSW) V BST V EN V FB IFB ISYNC θJA TA TJ TSTG TLEAD ESD
Limits -0.3 to +24(1) 16 -0.3 to +32 -0.3 to +16 -0.3 to +6 1 1 36.5 -40 to +85 150 -65 to +150 300...
