SC4519STRT Semtech

SC4519 600kHz, 3A Step-Down Switching Regulator POWER MANAGEMENT Features Description The SC4519 is a current mode switching regulator with Integrated 3 Amp switch an integrated switch, operating at 600kHz with separate 600kHz frequency of operation sync and enable functions. The integrated switch allows Current mode controller for cost effective low power solutions (peak switch current Synchronizable to higher frequency up to 1.2MHz 3 amps). The sync function allows customers to 6A low shutdown current synchronize to a faster clock in order to avoid frequency SOIC-8L-EDP Lead-free package. This product is beating in noise sensitive applications. High frequency fully WEEE and RoHS compliant of operation allows for very small passive components. Current mode operation allows for fast dynamic response Applications and instantaneous duty cycle adjustment as the input XDSL modems varies (ideal for CPE applications where the input is a CPE equipment wall plug power). DC-DC point of load applications The low shutdown current makes it ideal for portable Portable equipment applications where battery life is important. The SC4519 is a 600kHz switching regulator synchronizable to a faster frequency from 750kHz to 1.2MHz. Typical Application Circuit D1 C1 1 L1 BST 2 3 VIN VOUT IN SW SC4519 R1 5 6 Enable EN FB 8 7 C2 C3 SYNC COMP D2 GND 4 C4 R2 R3 Revision: April 18, 2007 1 www.semtech.comSC4519 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. Plarameter Ssymbo Lsimit Unit (1) IVnput Supply Voltage -0.3 to +24 V IN Boost Pin Above V (V - V)61V SW BST SW BVoost Pin Voltage -V0.3 to +32 BST EVN Pin Voltage -V0.3 to +16 EN FVB Pin Voltage -V0.3 to +6 FB FIB Pin Current 1Am FB SIYNC Pin Current 1Am SYNC (2) Thermal Impedance Junction to Ambient 3W6.5 C/ JA OTperating Ambient Temperature Range -C40 to +85 A MeaximumJTunction Temperatur 1C50 J STtorage Temperature Range -C65 to +150 STG LTead Temperature (Soldering) 10 sec 3C00 LEAD EDSD Rating (Human Body Model) E2S kV Notes: (1) For proper operation of device, V should be within maximum Operating Input Voltage as defined in Electrical IN Characteristics. (2) Minimum pad size. Electrical Characteristics Unless specified: V = 12V, V = 0.8V, V = V + 5V, EN = tied to V , SYNC = 0, SW = open. IN COMP BST IN IN T = T = -40C to 85C. A J Plarameter Ssymbo Cnondition Mpi TxyMsa Unit (1) OVperating Input Voltage 16 V IN MIaximum Switch Current Limit 3A.0 SW Ofscillator Frequency 50506007z5 kH OSC SVwitch On Voltage Drop I=03A 3V3 m D(SW) SW o VUVndervoltage Lockout T = 25C023.6 V IN UVLO A VSIupply Current V = V+017% 15. mA IN Q FB OUT(NOM) SItandby Current V = 0V, V = V = 16V, V=50V 4A5 Q(OFF) EN IN BOOST SW 2007 Semtech Corp. 2 www.semtech.com