MP8761 High Efficiency, 8A, 18V, Synchronous, Step-Down Converter DESCRIPTION FEATURES The MP8761 is a fully-integrated, high- 2.5V to 18V Operating Input Range with frequency, synchronous, rectified, step-down, External 5V Bias switch-mode converter. It offers a very compact 4.5V to 18V Operating Input Range with solution to achieve a 8A output current over a Internal Bias wide input-supply range with excellent load and 8A Output Current line regulation. The MP8761 operates at high Low R Internal Power MOSFETs DS(ON) efficiency over a wide output-current load range. Proprietary Switching-Loss-Reduction Technique The MP8761 uses Constant-On-Time (COT) Adaptive COT for Ultrafast Transient control mode to provide fast transient response Response and ease loop stabilization. 1% Reference Voltage Over Junction An external resistor programs the operating Temperature Range (0C to +125C) frequency from 200kHz to 1MHz. The Programmable Soft-Start Time frequency stays nearly constant as the input Pre-Bias Start-Up supply varies with the feed-forward Programmable Switching Frequency from compensation. 200kHz to 1MHz The default under voltage lockout threshold is Non-Latch OCP, OVP, and Thermal internally set at less than 4.1V, but a resistor Shutdown network on the enable pin can increase this Output Adjustable from 0.611V to 13V threshold. The soft start pin controls the output voltage startup ramp. An open drain power APPLICATIONS good signal indicates that the output is within Set-Top Boxes nominal voltage range. XDSL Modem/DSLAM It has full integrated protection features that Small-Cell Base Stations include over-current protection, over-voltage Personal Video Recorders protection and thermal shutdown. Flat-Panel Televisions and Monitors Distributed Power Systems The MP8761 is available in a 3mm4mm QFN package, and requires a minimal number of All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For MPS green status, please visit MPS website under Quality Assurance. readily-available components. MPS and The Future of Analog IC Technology are Registered Trademarks of Monolithic Power Systems, Inc. TYPICAL APPLICATION MP8761 Rev. 1.3 www.MonolithicPower.com 1 4/14/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP8770MP8761 8A, 18V, SYNCHRONOUS STEP-DOWN CONVERTER ORDERING INFORMATION Part Number Package Top Marking MP8761GL* QFN-13 (3mm4mm) MP8761 MP8761GLE** QFN-16 (3mm4mm) MP8761E * For Tape & Reel, add suffix Z (e.g. MP8761GLZ) ** For Tape & Reel, add suffix Z (e.g. MP8761GLEZ) Note: The 16-pin QFN package is preferred and recommended for new designs PACKAGE REFERENCE TOP VIEW TOP VIEW IN PGND PGND 14 13 12 EN 1 FREQ 2 FB 3 SS 4 15 16 SW SW AGND 5 PG 6 VCC 7 BST 8 9 10 11 IN PGND PGND 13-Pin QFN (3x4mm) 16-Pin QFN (3x4mm) Not Recommended for New Design Recommended for New Design (1) Follow Layout Recommendation for Best ABSOLUTE MAXIMUM RATINGS Performance Supply Voltage V ....................................... 21V IN (5) V ...................................... 0.3V to V + 0.3V SW IN Thermal Resistance JA JC V (30ns) ................................. 3V to V + 3V SW IN QFN (34mm) ........................ 46 ....... 9 .... C/W V .....................................................V + 6V BST SW (2) ..................................................... Notes: Enable Current I 2.5mA EN 1) Exceeding these ratings may damage the device. All Other Pins ................................ 0.3V to +6V 2) Refer to the section Configuring the EN Control. (3) 3) The maximum allowable power dissipation is a function of the Continuous Power Dissipation (T =+25) A maximum junction temperature T (MAX), the junction-to- J QFN34 ..................................................... 2.7W ambient thermal resistance , and the ambient temperature JA Junction Temperature .............................. 150C T . The maximum allowable continuous power dissipation at A any ambient temperature is calculated by P (MAX)=(T (MAX)- D J Lead Temperature ................................... 260C T )/ . Exceeding the maximum allowable power dissipation A JA Storage Temperature .............. 65C to +150C will cause excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry (4) protects the device from permanent damage. Recommended Operating Conditions 4) The device is not guaranteed to function outside of its Supply Voltage V .......................... 4.5V to 18V IN operating conditions. Output Voltage V .................... 0.611V to 13V 5) Measured on JESD51-7, 4-layer PCB. OUT I ................................................ 0mA to 1mA EN Operating Junction Temp. (T ). 40C to +125C J MP8761 Rev. 1.3 www.MonolithicPower.com 2 4/14/2020 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2020 MPS. All Rights Reserved. NOT RECOMMENDED FOR NEW DESIGNS REFER TO MP8770