MPQ8634B 16V, 20A, Sync, Step-Down Converter with Adjustable Current Limit, Programmable Frequency, and Voltage Tracking The Future of Analog IC Technology 20A Output Current DESCRIPTION Low R Integrated Power MOSFETs DS(ON) The MPQ8634B is a fully integrated, high- Proprietary Switching Loss Reduction frequency, synchronous, buck converter. The Technique MPQ8634B offers a very compact solution that Adaptive COT for Ultrafast Transient achieves up to 20A output current with excellent Response load and line regulation over a wide input Stable with Zero ESR Output Capacitor supply range. The MPQ8634B operates at high 0.5% Reference Voltage over 0C to efficiency over a wide output current load range. +70C Junction Temperature Range The MPQ8634B adopts an internally 1% Reference Voltage from -40C to compensated constant-on-time (COT) control +125C Junction Temperature Range mode that provides fast transient response and Selectable Pulse-Skip Mode or Forced CCM eases loop stabilization. Operation The operating frequency can be set to 600kHz, Excellent Load Regulation 800kHz, or 1000kHz easily with MODE Output Voltage Tracking configuration, allowing the MPQ8634Bs Output Voltage Discharge frequency to remain constant regardless of the PGOOD Actively Clamped at a Low Level input/output voltages. during Power Failure Programmable Soft-Start Time from 1.5ms The output voltage start-up ramp is controlled Pre-Bias Start-Up by an internal 1.5ms timer. It can be increased by adding a capacitor on TRK/REF. An open- Selectable Switching Frequency from 600kHz, 800kHz, and 1000kHz drain power good (PGOOD) signal indicates when the output is within its nominal voltage Non-Latch OCP, UVP, UVLO, Thermal range. PGOOD is clamped at around 0.7V with Shutdown, and Latch-Off for OVP an external pull-up voltage when the input Output Adjustable from 0.9V to 90%*VIN, supply fails to power the MPQ8634B. up to 6V Max Available in a QFN-21 (3mmx4mm) Fully integrated protection features include Package over-current protection (OCP), over-voltage protection (OVP), under-voltage protection APPLICATIONS (UVP), and over-temperature protection (OTP). Telecom and Networking Systems The MPQ8634B requires a minimal number of Servers, Cloud-Computing, Storage readily available, standard, external Base Stations components and is available in a QFN-21 General Purpose Point-of-Load (PoL) (3mmx4mm) package. 12V Distribution Power Systems FEATURES High-end TV Wide Input Voltage Range: Game Consoles and Graphic Cards o 2.85V to 16V with External 3.3V VCC All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For Bias MPS green status, please visit the MPS website under Quality Assurance. MPS and The Future of Analog IC Technology are registered o 4V to 16V with Internal VCC Bias or trademarks of Monolithic Power Systems, Inc. External 3.3V VCC Bias Differential Output Voltage Remote Sense Programmable Accurate Current Limit Level MPQ8634B Rev. 1.02 www.MonolithicPower.com 1 11/16/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2018 MPS. All Rights Reserved. MPQ8634B 16V, 20A, SYNC, STEP-DOWN CONVERTER W/ ADJUSTABLE CURRENT LIMIT, PROGRAMMBALE FREQUENCY, AND VOLTAGE TRACKING TYPICAL APPLICATION MPQ8634B Rev. 1.02 www.MonolithicPower.com 2 11/16/2018 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. 2018 MPS. All Rights Reserved.