SC2612E 500kHz Step-Down DC/DC Converter POWER MANAGEMENT Description Features The SC2612E is a voltage mode switcher designed for Operating frequency of 500kHz low cost, point of use voltage conversion. SC2612E is Input supply of 4.5V to 15V available with fixed switching frequencies of 500kHz. 0.5A Drive current for up to 10A output Output voltages down to 0.8V The SC2612E has soft start and enable functions and is Overcurrent protection and soft start short circuit protected. The output of the switcher may SO-8 package be set anywhere between 0.8V and 75% of Vin. Short circuit protection is disabled during start-up to allow the output capacitors time to fully charge. Applications Graphics IC Power supplies Embedded, low cost, high efficiency converters Typical Application Circuit 12V IN 5V IN R1 C10 C1 C2 U2 2 6 VCC BST Q2 R2 7 5 COMP DH L1 R3 8 3 SS/EN DL 1.5V OUT C5 4 1 GND FB Q3 R6 C7 C3 SC2612E C9 R9 R10 1 Revision: October 12, 2005 www.semtech.comSC2612E 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. Plarameter Smymbo Msaximu Unit VVCC Supply Voltage CC 1V8 BVoost Pin Voltage BST 2V0 DVL to GND, DH to GND DLO, VDHI -V1 to +20 DH to GND Negative Pulse (tpulse<V10ns) DH PULSE -V4.5 DL to GND Negative Pulse (tpulse<V20ns) DL PULSE -V4.5 OTperating Ambient Temperature Range A 0Cto 70 OTperating Junction Temperature J 1C25 STtorage Temperature STG -C65 to 150 LTead Temperature (Soldering) 10s LEAD 3C00 (1) Thermal Resistance Junction to Ambient 1W13 C/ JA Thermal Resistance Junction to Case 4W2 C/ JC EDSD Rating (Human Body Model) E2S kV Electrical Characteristics Unless specified: V = 4.5V to 12V V = V BST = Vcc+5V T = 0 to 70C CC FB O A Plarameter Ssymbo Cnondition Mpi TxyMsa Unit VVCC Supply Voltage CC 45.5 1V VICC Quiescent Current QVCC VCC = 5.0V, VBST=512.0V, SS/EN = 0V 1A0 m BVST Supply Voltage BST 48.5 1V BIST Quiescent Current QBST VCC = 5.0V, VBST=512.0V, SS/EN = 0V mA VVCC Under Voltage Lockout U VCC 35.845.1 4V. BVST Under Voltage Lockout U BST 35.1535. 3V.8 OVutput Voltage OS IO = 10mA VFB = VOS,T =52C2709 880 8V0 m A OVvercurrent trip voltage ITS 07.4 0V. LIoad Regulation O=10.2A to 4A % Line Regulation %0.5 Ofscillator Frequency OSC 4000500 6z0 kH Oscillator Max Duty Cycle MAX 8%0 SVS/EN Shutdown Voltage SS 08.3 0V. SIS/EN Charge current SSV5ss = 0.8V 2 A P,eak DH Sink/Source Current BVST - DH = 4.5V DH - GND = 3.3 0.5 A DH - GND = 1.5V 50 mA P,eak DL Sink/Source Current BVST - DL = 4.5V DL - GND = 3.3 0.5 A DL - GND = 1.5V 50 mA www.semtech.com 2005 Semtech Corp. 2