MP2490 1.5A, 36V, 700KHz Step-Down Converter with Programmable Output Current Limit The Future of Analog IC Technology DESCRIPTION FEATURES Wide 4.5V to 36V Operating Input Range The MP2490 is a monolithic step-down switch Programmable up to 1.5A Output Current mode converter with a programmable output current limit. It achieves 1.5A continuous output Output Adjustable from 0.8V to 15V 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 95% Efficiency 500mA (Vo=5V) sense resistor. Fixed 700kHz Frequency Fault condition protection includes cycle-by-cycle Thermal Shutdown current limiting and thermal shutdown. Cycle-by-Cycle Over Current Protection The MP2490 requires a minimum number of Available in QFN10 (3mm x 3mm), 8-Pin readily available standard external components. SOIC and PDIP Packages The MP2490 is available in QFN10 (3mm x 3mm), APPLICATIONS 8-pin SOIC and PDIP packages. USB Power Supplies Automotive Cigarette Lighter Adapters Power Supply for Linear Chargers All MPS parts are lead-free and adhere to the RoHS directive. 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 Efficiency vs. Load Current 89 100 PGOOD BST V =8V IN 1 6 VIN VIN ISN 90 4.5V - 36V 7 PGOOD ISP R8 V-PULL-UP V =12V C9 IN C6 80 10nF MP2490 10nF R5 3 EN EN L1 5V VOUT 10 SW 70 D1 4 5 V =24V FB 60 SS IN GND 2 GND V =5V OUT 50 10 100 1000 10000 LOAD CURRENT (mA) MP2490 Rev. 1.0 www.MonolithicPower.com 1 4/9/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved. EFFICIENCY (%)MP2490 1.5A, 36V, 700kHz STEP-DOWN WITH PROGRAMMABLE OUTPUT CURRENT LIMIT ORDERING INFORMATION Part Number Package Top Marking Free Air Temperature (T ) A MP2490DQ * QFN10 (3mm X 3mm) T6 40 C to +85C MP2490DS SOIC8 MP2490DS 40 C to +85C MP2490CP PDIP8 MP2490CP 0 C to +70 C * For Tape & Reel, add suffix Z (e.g. MP2490DQZ) For RoHS, compliant packaging, add suffix LF (e.g. MP2490DQLFZ). PACKAGE REFERENCE TOP VIEW VIN 1 10 SW TOP VIEW GND 2 9 BST VIN 1 8 SW EN 3 8 PGOOD GND 2 7 BST FB 4 7 ISP FB 3 6 ISP SS 5 6 ISN SS 4 5 ISN EXPOSED PAD ON BACKSIDE CONNECT TO GND QFN10 (3mm X 3mm) SOIC/PDIP (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC QFN10 (3mm x 3mm) .............50 ...... 12... C/W Supply Voltage V ....................................... 40V IN SOIC8 .....................................90 ...... 45... C/W V ....................................... 0.3V to V + 0.3V SW IN PDIP8......................................95 ...... 55... C/W V ................................................... V + 6.5V BST SW V v ................................................0V to15V ISN, ISP Notes: All Other Pins..............................0.3V to +6.5V 1) Exceeding these ratings may damage the device. (2) 2) The maximum allowable power dissipation is a function of the Continuous Power Dissipation (T = +25C) A maximum junction temperature T (MAX), the junction-to- J QFN10 (3mm x 3mm) ................................ 2.5W ambient thermal resistance , and the ambient temperature JA SOIC8 ...................................................... 1.39W T . The maximum allowable continuous power dissipation at A any ambient temperature is calculated by P (MAX) = (T D J PDIP8 ...................................................... 1.32W (MAX)-T )/ . Exceeding the maximum allowable power A JA Junction Temperature...............................150C dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal Lead Temperature ....................................260C shutdown circuitry protects the device from permanent Storage Temperature.............. 65 C to +150 C damage. 3) The device is not guaranteed to function outside of its (3) operating conditions. Recommended Operating Conditions 4) Measured on JEDEC51-7 4 layer PCB. Supply Voltage V ...........................4.5V to 36V IN Output Voltage V (V >16.5V) ....... 0.8V to 15 OUT IN Output Voltage V (V <=16.5V)...................... OUT IN .........................................0.8V to (V 1.5)V IN Operating Junction Temperature (T ) J ................................................ 40C to +125 C MP2490 Rev. 1.0 www.MonolithicPower.com 2 4/9/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2014 MPS. All Rights Reserved.