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Monolithic Power Systems (MPS) MPQ8643 Synchronous Step-Down Converters

Monolithic Power Systems (MPS) MPQ8643 Synchronous Step-Down Converters are capable of achieving up to 20A of output current across a wide input voltage range. These step-down converters feature adjustable current limits and voltage tracking and operate at high frequencies across a wide IOUT load range. The MPQ8643 converters also feature internally compensated Constant-On-Time (COT) control that provides a fast transient response and eases loop stabilization. By configuring the MODE pin, the selectable switching frequency (FSW) can be set to 600kHz, 800kHz, or 1000kHz. This maintains a constant fSW, regardless of VIN and the output voltage (VOUT). These converters offer excellent load regulation, selectable Pulse-Skip Mode (PSM) or Forced Continuous Conduction Mode (FCCM), output voltage tracking and discharge, and differential output remote sense. 

The MPQ8643 converters also offer Over-Current Protection (OCP), Over-Voltage Protection (OVP), Under-Voltage Protection (UVP), and Over-Temperature Protection (OTP). These converters come in a 3mm x 4mm QFN-21 package. Applications include telecom and networking systems, base stations, 12V distribution power systems, general-purpose Point-of-Load (PoL), and high-end televisions.

Features

  • Wide input voltage (VIN) range:
    • 2.7V to 16V with external 3.3V bias
    • 4V to 16V with internal bias or external 3.3V bias
  • Differential output remote sense
  • Configurable accurate current limit (ILIMIT)
  • 20A output current (IOUT)
  • Integrated low RDS(ON) power MOSFETs
  • Proprietary switching loss reduction technique
  • Adaptive Constant-On-Time (COT) control for ultra-fast transient response
  • Stable with zero-ESR output capacitor
  • Reference voltage (VREF) accuracy:
    • 0.5% VREF accuracy from 0°C to 70°C
    • 1% VREF accuracy from -40°C to 125°C
  • Selectable Pulse-Skip Mode (PSM) or Forced Continuous Conduction Mode (FCCM)
  • Excellent load regulation
  • Output voltage tracking and discharge
  • PGOOD clamped low during power failure
  • Configurable Soft-Start Time (tSS) from 1ms
  • Pre-bias start-up
  • 600kHz, 800kHz, or 1000kHz selectable fSW
  • Non-Latch OCP, UVP, UVLO, and thermal shutdown; OVP with latch-off mode
  • Adjustable output from 0.6V to 90% of VIN (5.5V max)
  • Available in a QFN-21 (3mm x 4mm) package

Applications

  • Telecom and networking systems
  • Servers, cloud computing, and storage
  • Base stations
  • General-purpose Point-of-Load (PoL)
  • 12V distribution power systems
  • High-end televisions
  • Game consoles and graphic cards

Block Diagram

Block Diagram - Monolithic Power Systems (MPS) MPQ8643 Synchronous Step-Down Converters

Typical Application Circuit

Application Circuit Diagram - Monolithic Power Systems (MPS) MPQ8643 Synchronous Step-Down Converters
Published: 2024-07-09 | Updated: 2024-08-08