MP2492 2A, 55V, 100kHz Step-Down Converter with Programmable Output Current Limit The Future of Analog IC Technology DESCRIPTION FEATURES Wide 4.5V to 55V Operating Input Range The MP2492 is a monolithic step-down switch Programmable up to 2A Output Current mode converter with a programmable output Output Adjustable from 0.8V to 15V current limit. It achieves 2A continuous output current over a wide input supply range with Programmable Output Current Limit without excellent load and line regulation. power loss 0.25 Internal Power MOSFET Switch The maximum output current can be Stable with Low ESR Output Ceramic programmed by sensing current through the Capacitors inductor DC resistance (DCR) or an accurate Fixed 100kHz Frequency sense resistor. Low EMI signature MP2492 achieves low EMI signature with well Thermal Shutdown controlled switching edges. Cycle-by-Cycle Over Current Protection Available in QFN10 and SOIC8E Packages Fault condition protection includes cycle-by-cycle current limiting, and thermal shutdown. APPLICATIONS The MP2492 requires a minimum number of USB Power Supplies readily available standard external components. Automotive Cigarette Lighter Adapters The MP2492 is available in QFN10 (3mm x 3mm) Power Supply for Linear Chargers and SOIC8E packages. MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION Efficiency V =12V , V =5V IN OUT 100 90 80 70 60 50 40 30 20 0.0 0.4 0.8 1.2 1.6 2.0 I (A) OUT MP2492 Rev. 1.0 www.MonolithicPower.com 1 12/20/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved. EFFICIENCY ( % ) MP2492 2A, 55V, 100kHz WITH PROGRAMMABLE OUTPUT CURRENT LIMIT ORDERING INFORMATION Part Number Package Top Marking Free Air Temperature (T ) A MP2492DN* SOIC8E MP2492DN 40 C to +85C MP2492DQ** QFN10(3mmx3mm) 3Q 40 C to +85C * For Tape & Reel, add suffix Z (e.g. MP2492DNZ). For RoHS compliant packaging, add suffix LF (e.g. MP2492DNLFZ) ** For Tape & Reel, add suffix Z (e.g. MP2492DQZ). For RoHS compliant packaging, add suffix LF (e.g. MP2492DQLFZ) PACKAGE REFERENCE SW SW VIN VIN BST GND BST GND EN PGOOD ISP FB ISP FB SS ISN SS ISN EXPOSED PAD EXPOSED PAD ON BACKSIDE ON BACKSIDE CONNECT TO GND CONNECT TO GND SOIC8E QFN10(3mmx3mm) (3) (1) Recommended Operating Conditions ABSOLUTE MAXIMUM RATINGS Input Voltage V .............................. 4.5V to 55V IN Input Voltage V .......................................... 60V IN Output Voltage V (V >16.5V) ...... 0.8V to 15V OUT IN V ....................................... 0.3V to V + 0.3V SW IN Output Voltage V (V <=16.5V) ..................... OUT IN V ................................................... V + 6.5V BST SW ........................................ 0.8V to (V 1.7) V IN V v ................................................ 0V to15V ISN, ISP Operating Junct. Temp......... 40C to +125 C V - v ........................................ 0 to 0.5V ISN, ISP (4) V ....................................................... 0V to15V EN, Thermal Resistance JA JC All Other Pins .............................. 0.3V to +6.5V SOIC8E................................... 50...... 10 .. C/W (2) Continuous Power Dissipation (T = +25C) A QFN10 (3 x 3 mm)...................50........12... C/W SOIC8E ...................................................... 2.5W Notes: QFN10 (3 x 3 mm) ..................................... 2.5W 1) Exceeding these ratings may damage the device. 2) The maximum allowable power dissipation is a function of the Junction Temperature ............................... 150 C maximum junction temperature T (MAX), the junction-to- J Lead Temperature .................................... 260 C ambient thermal resistance , and the ambient temperature JA T . The maximum allowable continuous power dissipation at A Storage Temperature .............. 50 C to +150 C any ambient temperature is calculated by P (MAX) = (T D J (MAX)-T )/ . Exceeding the maximum allowable power A JA dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. 3) The device is not guaranteed to function outside of its operating conditions. 4) Measured on JESD51-7, 4-layer PCB. MP2492 Rev. 1.0 www.MonolithicPower.com 2 12/20/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2010 MPS. All Rights Reserved.