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reference designMP8761

Monolithic Power Systems MP8761

High Efficiency, 8A, 18V,Synchronous, Step-Down Converter

Overview

TopologyBuck Converter
Input voltage12 V
Switching frequency200-1000 kHz
Output 11 V
IC revision1.1

Description

The MP8761 is a fully-integrated, highfrequency,synchronous, rectified, step-down, switch-mode converter. It offers a very compact solution to achieve a 8A output current over a wide input-supply range with excellent load and line regulation. The MP8761 operates at high efficiency over a wide output-current load range.The MP8761 uses Constant-On-Time (COT) control mode to provide fast transient response and ease loop stabilization.An external resistor programs the operating frequency from 200kHz to 1MHz. The frequency stays nearly constant as the input supply varies with the feed-forward compensation.The default under voltage lockout threshold is 4.1V, but a resistor network on the enable pin can increase this threshold. The soft start pin controls the output voltage startup ramp. An open drain power good signal indicates that the output is within nominal voltage range.It has full integrated protection features that include over current protection, over-voltage protection and thermal shutdown.The MP8761 is available in a 3mm×4mm QFN package, and requires a minimal number of readily-available components.

Features

  • 2.5V to 5V Operating Input Range with External 5V Bias
  • 4.5V to 18V Operating Input Range with Internal Bias
  • 8A Output Current
  • Low RDS(ON) Internal Power MOSFETs
  • Proprietary Switching-Loss-Reduction Technique
  • Adaptive COT for Ultrafast Transient Response
  • 1.5% Reference Voltage Over Junction Temperature Range (−40°C to +125°C)
  • Programmable Soft-Start Time
  • Pre-Bias Start-Up
  • Programmable Switching Frequency from 200kHz to 1MHz
  • Non-Latch OCP, OVP, and Thermal Shutdown
  • Output Adjustable from 0.611V to 13V

Typical applications

  • XDSL Modem/DSLAM
  • Small-Cell Base Stations
  • Flat-Panel Televisions and Monitors
  • Personal Video Recorders
  • Distributed Power Systems
  • Set-Top Boxes

More information

Parts approved by Monolithic Power Systems

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC(mΩ)
fres(MHz)
Material
Qty.
SamplesAvailability & Sample
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744325072
SPECWE-HCI SMT Flat Wire High Current Inductor, 0.72 µH, 37.8 A

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCI SMT Flat Wire High Current Inductor
Inductance0.72 µH
Performance Rated Current37.8 A
Saturation Current @ 10%14 A
Saturation Current @ 30%35 A
DC Resistance1.3 mΩ
Self Resonant Frequency115 MHz
MaterialSuperflux 
Packaging Unit700 
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