SC339SKTRT Semtech

SC339 Ultra Low Output Voltage Linear FET Controller POWER MANAGEMENT Description Features The SC339 is an ultra-low output voltage, linear power % Voltage Accuracy Over-Temperature supply controller designed to simplify power manage- Low Shutdown Current ment for notebook PCs. It is part of Semtechs Smart Runs Off 5V Supply TM LDO family of products. The SC339 has a user Ultra-Fast Transient Response adjustable output that can be set anywhere between 0.5V Enable Control for the Output and 3.3V using two external resistors. Power Good Monitoring and Signaling for the Output Gate Drive from Input Supply Enables Use of SC339 features include tight output voltage regulation ( N-Channel MOSFET % over 0C to +85C), enable control, open drain power User Selectable Dropout Voltage good signal, under-voltage protection and soft-start. The enable pin allows the part to enter a very low power standby Under-Voltage Protection for the Output mode. Pulling it high enables the output. The power good SOT-23 6-pin Surface Mount Package pin is an open drain and asserts low when the voltage at Compatible with Ceramic Capacitors the adjust pin is below 88% (typ) of nominal. If the voltage Low Ripple Output at the adjust pin is below 50% (typ) of nominal, the under- Internal ms soft-start requires no external compo- voltage protection circuitry will shut down the output. The nents SC339 is available in a tiny SOT-23 6-pin surface mount Fully WEEE and RoHS compliant package. Applications Notebook PCs Desktop Computers Battery Powered Devices Typical Application Circuit Portable Instruments 1.2V +/-5% IN IRF7311 C1 or similar V = (1+R1/R2)*0.5 out 1.05V 3A C2 5V IN R1 DRV IN GND SC339 ADJ 1.05V EN PGD 1.05V Enable Power Good (1) R3 C4 R2 (1) Notes: C3 (1) Optional Components to use with ceramic output capacitors (C2) Sept , 2006 www.semtech.com SC339 PRELIMINARY 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 Symbol Maximum Units Input Supply Voltage V -0.3 to +6 V IN Drive Pin V -0.3 to V + 0.3V V DRV IN Adjust and Power Good Pin V , V -0.3 to V + 0.3V V ADJ PGD IN Enable Pin V -0.3 to V + 0.3V V EN IN Thermal Impedance Junction to Ambient 190 C/W JA Thermal Impedance Junction to Case 81 C/W JC Operating Ambient Temperature Range T -40 to +85 C A Operating Junction Temperature Range T -40 to +125 C J Storage Temperature Range T -65 to +150 C STG Lead Temperature (Soldering) 10 Sec. T 300 C LEAD ESD Rating (Human Body Model) V 2 kV ESD Electrical Characteristics ( ) Unless specified: T = 25C, V = V = 5V 5%, V = .5V 5%, 0A I 3A. Values in bold apply over full operating ambient temperature range. A IN EN PWR OUT Parameter Symbol Conditions Min Typ Max Units Supply Voltage V 4.5 5 5.5 V IN Quiescent Current I V = 5V 130 200 A Q IN Standby Current I EN low 0.1 1.0 A Q(OFF) Input Under-Voltage Lockout Start Threshold V V rising 4.20 V UVLO IN Hysteresis V V falling 0.10 V HYST IN EN V Output on 2.8 IH Enable Input Threshold V V Output off 1.8 IL Enable Input Bias Current V = V = 5V -1 +1 A IN EN 2006 Semtech Corp. www.semtech.com 2