MP24943 3A, 55V, 100kHz Step-Down Converter with Programmable Output OVP Threshold The Future of Analog IC Technology DESCRIPTION FEATURES The MP24943 is a monolithic, step-down, Wide 4.5V to 55V Operating Input Range switch-mode converter. It supplies 3A of Programmable Output Over-Voltage continuous output current over a wide input- Protection supply range with excellent load and line Output Adjustable from 0.8V to 45V regulation. 0.15 Internal Power MOSFET Switch Stable with Low ESR Output Ceramic MP24943 achieves low EMI signature with well- Capacitors controlled switching edges. Fixed 100kHz Frequency Fault condition protection includes Low EMI Signature programmable-output over-voltage protection, Thermal Shutdown cycle-by-cycle current limit, and thermal Cycle-by-Cycle Over-Current Protection shutdown. Available in SOIC8 and SOIC8E Packages MP24943 requires a minimal number of readily- APPLICATIONS available standard external components. It is available in SOIC8 and SOIC8E package. Automotive GPS Automotive Entertainment Power Supply for Linear Chargers For MPS green status, please visit MPS website under Quality Assurance. MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION 95 V =12V 90 IN 85 80 V =24V IN 75 70 V =55V IN 65 60 55 50 0 0.5 1 1.5 2 2.5 3 MP24943 Rev. 1.0 www.MonolithicPower.com 1 9/13/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2011 MPS. All Rights Reserved. MP24943 3A, 55V, 100kHz STEP-DOWN CONVERTER ORDERING INFORMATION Part Number Package Top Marking Free Air Temperature (T ) A MP24943DS* SOIC8 MP24943 -40C to +85C MP24943DN** SOIC8E MP24943 -40C to +85C * For Tape & Reel, add suffix Z (eg. MP24943DSZ) For RoHS, compliant packaging, add suffix LF (eg. MP24943DSLFZ). * For Tape & Reel, add suffix Z (eg. MP24943DNZ) For RoHS, compliant packaging, add suffix LF (eg. MP24943DNLFZ). PACKAGE REFERENCE TOP VIEW TOP VIEW VIN 1 8 SW GND 2 7 BST VIN 1 8 SW EN 3 6 VO GND 2 7 BST FB 4 5 SS EN 3 6 VO FB 4 5 SS EXPOSED PAD ON BACKSIDE CONNECT TO PIN 2 SOIC8 SIOC8E (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC Input Voltage V .......................................... 60V SOIC8 ..................................... 90 ...... 45 ... C/W IN V ..................................... -0.3V to (V + 0.3V) SOIC8E .................................. 50 ...... 10 ... C/W SW IN V ................................................... V + 6.5V BST SW Notes: 1) Exceeding these ratings may damage the device. All Other Pins ............................... -0.3V to +6.5V 2) The maximum allowable power dissipation is a function of the Junction Temperature ............................... 150C maximum junction temperature T (MAX), the junction-to- J Lead Temperature .................................... 260C ambient thermal resistance , and the ambient temperature JA T . The maximum allowable continuous power dissipation at A Storage Temperature ............... -65C to +150C any ambient temperature is calculated by P (MAX) = (T D J (2) Continuous Power Dissipation (T = 25C) (MAX)-T )/ . Exceeding the maximum allowable power A A JA dissipation will cause excessive die temperature, and the SOIC8 ...................................................... 1.38W regulator will go into thermal shutdown. Internal thermal SOIC8E ...................................................... 2.5W shutdown circuitry protects the device from permanent damage. (3) 3) The device is not guaranteed to function outside of its Recommended Operating Conditions operating conditions. Input Voltage V .............................. 4.5V to 55V IN 4) Measured on JESD51-7, 4-layer PCB. Output Voltage V ......................... 0.8V to 45V OUT Maximum Junction Temp. (T ) .................. 125C J MP24943 Rev. 1.0 www.MonolithicPower.com 2 9/13/2011 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2011 MPS. All Rights Reserved.