SC4614MSTRT Semtech

SC4614 500kHz Voltage Mode PWM Controller POWER MANAGEMENT Description Features The SC4614 is a high-speed, voltage mode PWM con- 500kHz switching frequency troller that provides the control and protection features 4V to 25V power rails necessary for a synchronous buck converter. 0.5V voltage reference for programmable output voltages The SC4614 is designed to directly drive the top and Internal LDO for optimum gate drive voltage bottom MOSFETs of the buck converter. It allows the con- 1.5A gate drive current verter to operate at 500kHz switching frequency with 4V to 25V power rail and as low as 0.5V output. It uses Adaptive non-overlapping gate drives provide an internal 8.2V supply as the gate drive voltage for mini- shoot-through protection for MOSFETs mum driver power loss and MOSFET switching loss. Internal soft start Hiccup mode short circuit protection The SC4614 features soft-start, supply power under volt- Power rail under voltage lockout age lockout, and hiccup mode over current protection. MSOP-10 package, fully RoHS and WEEE compliant The SC4614 monitors the output current by using the Rdson of the bottom MOSFET in the buck converter that eliminates the need for a current sensing resistor. The Applications SC4614 is offered in a MSOP-10 package. Embedded, low cost, high efficiency converters Point of load power supplies Set top box power supplies PDP/TFT TVs Consumer electronics Typical Application Circuit 12V IN + 1 10 BST DH 1.5V OUT 2 9 OCS PN 1 2 3 8 COMP DL 4 7 FB VCC 5 6 + GND DRV SC4614 1 January 16, 2007 www.semtech.comSC4614 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 IVnput Supply Voltage CC 2V0 BVST to GND 4V0 BST BVST to PN 1V0 BST PN PVN to GND -V1 to 30 PN PN to GND Negative Pulse (t<V20ns) -V5 pulse PN PULSE DVL to GND -01 to+V1 DL DL to GND Negative Pulse (t<V20ns) -V3 pulse DL PULSE DVH to PN -01 to+V1 DH PN DH to PN Negative Pulse (t<V20ns) -V3 pulse DH PULSE DVRV to GND 1V0 DRV OTperating Ambient Temperature Range -C40 to 85 A OTperating Junction Temperature -C40 to 125 J Thermal Resistance Junction to Ambient 1W36 C/ JA Thermal Resistance Junction to Case 4W5 C/ JC LTead Temperature (Soldering) 10s 3C00 LEAD STtorage Temperature -C65 to 150 STG Electrical Characteristics Unless specified: V = 5V to 18V V = V V - V = 5V to 8.2V T = -40 to 85C CC FB O BST PN A Plarameter Ssymbo Cnondition Mpi TxyMsa Unit General VVCC Supply Voltage CC 481V VICC Quiescent Current VCC = 12V, VBST -VPN = 8.2V 57 mA QVCC VVCC Under Voltage Lockout U V=4100mV V VCC HYST BVST to PN Supply Voltage 401V BST PN BIST Quiescent Current VCC = 12V, VBST -VPN = 8.2V 3Am QBST InternalLDO LVDO Output 8.6V < V<218V 8V. DRV CC DVropout Voltage 4V < V<48.6V 0V. DROP CC www.semtech.com 2005 Semtech Corp. 2