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SC339EVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC339EVB Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 15 page 1 www.semtech.com SC339 Ultra Low Output Voltage Linear FET Controller POWER MANAGEMENT Sept 11, 2006 Description Features The SC339 is an ultra-low output voltage, linear power supply controller designed to simplify power manage- ment for notebook PCs. It is part of Semtech’s Smart LDOTM family of products. The SC339 has a user adjustable output that can be set anywhere between 0.5V and 3.3V using two external resistors. SC339 features include tight output voltage regulation (± 1% over 0°C to +85°C), enable control, open drain power good signal, under-voltage protection and soft-start. The enable pin allows the part to enter a very low power standby mode. Pulling it high enables the output. The power good pin is an open drain and asserts low when the voltage at the adjust pin is below 88% (typ) of nominal. If the voltage at the adjust pin is below 50% (typ) of nominal, the under- voltage protection circuitry will shut down the output. The SC339 is available in a tiny SOT-23 6-pin surface mount package. ± 1% Voltage Accuracy Over-Temperature Low Shutdown Current Runs Off 5V Supply Ultra-Fast Transient Response Enable Control for the Output Power Good Monitoring and Signaling for the Output Gate Drive from Input Supply Enables Use of N-Channel MOSFET User Selectable Dropout Voltage Under-Voltage Protection for the Output SOT-23 6-pin Surface Mount Package Compatible with Ceramic Capacitors Low Ripple Output Internal 1ms soft-start requires no external compo- nents Fully WEEE and RoHS compliant Notebook PCs Desktop Computers Battery Powered Devices Portable Instruments Typical Application Circuit Applications 1.05V @ 3A SC339 IN DRV ADJ PGD EN GND C1 C2 C4 5V IN 1.05V Enable 1.05V Power Good 1.2V +/-5% IN IRF7311 or similar Vout = (1+R1/R2)*0.5 Notes: (1) Optional Components to use with ceramic output capacitors (C2) C3 (1) R3 (1) R1 R2 |
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