MP9181 High Efficiency, Fast Transient, 3A, 4.5V-20V Input Synchronous Step-down Converter in a Tiny 2mmx3mm QFN12 Package The Future of Analog IC Technology DESCRIPTION FEATURES The MP9181 is a fully-integrated, high- Compatible with Intel Thunderbolt Specs efficiency, synchronous, step-down, switch Wide 4.5V to 20V Operating Input Range mode converter. It offers a very compact 3A Output Current solution that can achieve 3A continuous output +/-1% V Voltage Tolerance FB current over a wide input supply range with Low R (ON) Internal Power MOSFETs DS excellent load and line regulation. This device Proprietary Switching Loss Reduction operates with high efficiency over a wide Technique output-current load range. Up to 95% Peak Efficiency Constant-On-Time (COT) control mode High Light Load Efficiency provides fast transient response and eases loop Soft Start-up/Shutdown stabilization. Programmable Switching Frequency SCP, OCP, UVP Protection and Thermal Full protection features include SCP, OCP, Shutdown UVP, and thermal shut down. Hiccup Mode during OCP The MP9181 requires a minimal number of Power Good Indicator readily-available standard external components. Ultra-small (2mmx3mm) QFN Package This device is available in a space-saving APPLICATIONS 2mmx3mm 12-pin QFN package. Networking/Communication Systems System I/O Power Distributed Power Systems 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 MP9181 Rev 1.01 www.MonolithicPower.com 1 12/10/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved. MP9181 3A, 4.5V-20V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER IN QFN12 (2X3mm) ORDERING INFORMATION Part Number Package Top Marking MP9181DD QFN12 (2x3mm) AEH * For Tape & Reel, add suffix Z (e.g. MP9181DDZ). For RoHS Compliant Packaging, add suffix LF (e.g. MP9181DDLFZ) PACKAGE REFERENCE TOP VIEW GND 12 GND 1 11 GND SW 10 SW 2 SW 9 BST 3 IN 4 8 VCC FREQ 5 7 EN FB 6 PG QFN12 (2x3mm) (4) (1) Thermal Resistance JA JC ABSOLUTE MAXIMUM RATINGS QFN12 (2mmx3mm)............... 70...... 15... C/W Supply Voltage V ....................................... 22V IN V ... -0.3V (-4V<10ns) to V +0.3V (24V<10ns) SW IN Notes: 1) Exceeding these ratings may damage the device. About the V ...................................................... V + 6V BST SW details of EN pins ABS MAX rating, please refer to Page 12 I ........................................................ 3.5A VIN (RMS) Enable Control section. All Other Pins..................................-0.3V to +6V 2) The maximum allowable power dissipation is a function of the (2) maximum junction temperature T (MAX), the junction-to- J Continuous Power Dissipation (T = 25C) A ambient thermal resistance , and the ambient temperature JA QFN12 (2X3mm)........................................ 1.8W T . The maximum allowable continuous power dissipation at A any ambient temperature is calculated by P (MAX) = (T D J Junction Temperature ..............................150C (MAX)-T )/ . Exceeding the maximum allowable power A JA Lead Temperature ....................................260C dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal Storage Temperature............... -65C to +150 C shutdown circuitry protects the device from permanent (3) damage. Recommended Operating Conditions 3) The device is not guaranteed to function outside of its operating conditions. Supply Voltage V ...........................4.5V to 20V IN 4) Measured on JESD51-7, 4-layer PCB. Output Voltage V .....................0.815V to 13V OUT Operating Junction Temp. (T ). -40C to +125C J MP9181 Rev 1.01 www.MonolithicPower.com 2 12/10/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2012 MPS. All Rights Reserved.