MP7745 2 x 20W Class D Stereo Single Ended Audio Amplifer The Future of Analog IC Technology DESCRIPTION FEATURES The MP7745 is a Stereo 2 x 20W Class D 2 x 20W Output at V = 24V into 4 load DD Audio Amplifier. It is one of MPS products of THD+N = 0.05% at 1W, 8 fully integrated audio amplifiers which 93% Efficiency at 20W, 4 & V = 24V DD dramatically reduces solution size by integrating Low Noise (103V Typical) the following: Switching Frequency Up to 1MHz 250m power MOSFETs 9.5V to 26V Operation from a Single Supply Startup / Shutdown pop elimination Integrated Startup and Shutdown Pop Elimination Circuit Short circuit protection circuits Thermal and Short Circuit Protection The MP7745 utilizes a single ended output Integrated Power FETs structure capable of delivering 20W per channel Pin Compatible with MP7722 and MP7742 into 4 speakers. MPS Class D Audio Available in TSSOP20-Exposed Package Amplifiers exhibit the high fidelity of a Class A/B amplifier at high efficiencies. The circuit is APPLICATIONS based on the MPS proprietary variable Flat Panel TV frequency topology that delivers excellent Portable Docking Stations linearity, fast response time and operates on a Surround Sound DVD Systems single power supply. Televisions Multimedia Computers Home Stereo Systems MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. AAM (Analog Adaptive Modulation) is a Trademark of Monolithic Power Systems, Inc. TYPICAL APPLICATION V DD V DD 18 13 20 2 REF1 VDD1 VDD2 10 17 BS1 5 CH1 3 IN1 INPUT 19 SW1 VDD 2 CH1 MP7745 OUTPUT 1 8 REF2 12 BS2 0.5 14 SW2 0.2 CH2 7 IN2 INPUT CH2 0.1 OUTPUT 6 EN1 10 0.05 EN/SHDN EN2 4, 5 AGND1 9 AGND2 PGND1 PGND2 0.02 20 15 0.01 12 5 10 20 40 P (W) MP7745 Rev. 0.9 www.MonolithicPower.com 1 5/11/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2009 MPS. All Rights Reserved. MP7745 2 x20 W CLASS D STEREO SINGLE ENDED AUDIO AMPLIFIER ORDERING INFORMATION Part Number* Package Top Marking Temperature TSSOP20F MP7745DF MP7745DF 40 C to +85C *For Tape & Reel, add suffix Z (e.g. MP7745DFZ). For Lead Free, add suffix LF (e.g. MP7745DFLFZ) PACKAGE REFERENCE 1 20 2 19 3 18 4 17 5 16 6 15 7 14 8 13 9 12 10 11 (1) (4) ABSOLUTE MAXIMUM RATINGS Thermal Resistance JA JC Supply Voltage V ...................................... 32V DD TSSOP20F ............................. 40....... 6......... C BS Voltage..................V 0.3V to V + 6.5V SW SW Notes: Enable Voltage V ........................0.3V to +6V EN 1) Exceeding these ratings may damage the device. V ...................1V (-5V for <10nS) to V + 1V SW DD 2) The maximum allowable power dissipation is a function of the maximum junction temperature T (MAX), the junction-to- V , V ................................... 1V to V + 1V J PIN NIN DD ambient thermal resistance , and the ambient temperature JA AGND to PGND ..........................0.3V to +0.3V T . The maximum allowable continuous power dissipation at A (2) Continuous Power Dissipation (T = +25C) A any ambient temperature is calculated by P (MAX) = (T D J (MAX)-T )/ . Exceeding the maximum allowable power A JA ....3.1W dissipation will cause excessive die temperature, and the Junction Temperature...............................150C regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent Lead Temperature ....................................260C damage. Storage Temperature.............. 65 C to +150 C 3) The device is not guaranteed to function outside of its operating conditions. (3) Recommended Operating Conditions 4) Measured on JESD5 1-7, 4-layer PCB. Supply Voltage V ..........................9.5V to 26V DD Operating Temperature T ........ 40C to +85 C A MP7745 Rev. 0.9 www.MonolithicPower.com 2 5/11/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. 2009 MPS. All Rights Reserved.