MPQ8862
High-current synchronous buck converter with integrated MOSFETs, delivering 12A continuous output with 95% peak effic...
Product Overview
Description
The MPQ8862 integrates high-side and low-side power MOSFETs with advanced control circuitry to deliver up to 12A continuous output current. Operating from a wide 6V to 36V input range, it supports 12V and 24V bus applications common in industrial and automotive systems.
The device features constant-on-time (COT) control architecture providing fast transient response and minimizing output capacitance requirements. Internal compensation simplifies design while maintaining stability across the operating range. Peak efficiency reaches 95% at 12V input and 5V output.
Automotive-qualified (AEC-Q100) versions are available with enhanced temperature ranges and reliability features. Protection functions include cycle-by-cycle current limiting, thermal shutdown, and input undervoltage lockout. The device supports external synchronization and power good output for sequencing applications.
Product Series
MPQ
Primary Application
Industrial automation
Key Features
- 12A output current
- Integrated MOSFETs
- 95% peak efficiency
- AEC-Q100 qualified
- Wide input range
Specifications
| Input Voltage | 6V to 36V |
|---|---|
| Output Voltage | 0.6V to 0.9 x VIN |
| Output Current | 12A continuous |
| Peak Efficiency | 95% |
| Switching Frequency | 200kHz to 1MHz |
| Operating Temperature | -40°C to +125°C (AEC-Q100) |
| Package | QFN-20 (5mm x 5mm) |
Applications
Industrial automation
Industrial automation and control
Automotive systems
Automotive and EV electronics
Telecom equipment
Electronic system design
Server power
Electronic system design
Battery charging
Battery and charging management
FAE Expert Insights
"The MPQ8862 is an excellent choice for high-current industrial and automotive applications. The integrated MOSFETs simplify design while delivering impressive efficiency. I've successfully used this in multiple 24V industrial control systems and automotive body electronics projects. The COT control provides excellent transient response - much better than voltage-mode alternatives. The AEC-Q100 qualification gives confidence for automotive use. One tip: pay attention to the switching frequency selection - lower frequencies improve efficiency but require larger inductors. For most applications, I recommend 400-600kHz as a good balance."
High-current capability with 95% efficiency and automotive qualification
— David Zhang, BeiLuo
Frequently Asked Questions
What inductor value should I use with the MPQ8862?
Inductor selection depends on switching frequency and ripple current requirements. For 12V to 5V conversion at 500kHz, a 2.2µH inductor provides approximately 30% ripple current. Use the formula L = (Vout x (Vin - Vout)) / (Vin x Fsw x dI). Choose inductors with saturation current at least 20% above peak current. MPS recommends shielded inductors for EMI-sensitive applications. Popular choices include Coilcraft XAL series or Wurth WE-LHMI series.
Use MPS's inductor selection tool or contact our FAE team for specific inductor recommendations.
How do I set the output voltage?
The MPQ8862 uses external resistor divider to set output voltage. Connect FB pin to center tap of divider between VOUT and AGND. Use Rbottom = 10kΩ and calculate Rtop = Rbottom x (Vout/0.6V - 1). For 3.3V output: Rtop = 10k x (3.3/0.6 - 1) = 45kΩ. Use 1% tolerance resistors for accuracy. Place divider close to FB pin with short traces. The device also supports external voltage tracking for sequencing applications.
Download the MPQ8862 calculation spreadsheet for automated resistor value calculations.
What is the switching frequency selection guidance?
The MPQ8862 supports 200kHz to 1MHz switching frequency. Lower frequencies (200-400kHz) provide better efficiency but require larger inductors and capacitors. Higher frequencies (600kHz-1MHz) enable smaller magnetics but have slightly lower efficiency and higher EMI. For 12A applications, I recommend 400-600kHz as optimal balance. The frequency can be set with external resistor or synchronized to external clock for multi-rail systems.
Consider size constraints vs efficiency requirements when selecting switching frequency. Contact us for optimization guidance.
How do I implement parallel operation for higher current?
The MPQ8862 supports current sharing through external current sense and balance circuitry. For parallel operation: 1) Connect COMP pins together for current sharing. 2) Use identical inductors and current sense resistors. 3) Ensure symmetrical layout for equal current distribution. 4) Add small ballast resistors (10-20mΩ) if needed for current balancing. Alternatively, consider the MPM3695-25 module which supports 25A single output or parallel operation up to 100A.
Contact our FAE team for parallel operation reference designs and layout guidelines.
What are the key differences between industrial and automotive versions?
The MPQ8862-GJ (industrial) and MPQ8862-AEC1 (automotive) have similar electrical specifications but differ in qualification and temperature grades. The automotive version is AEC-Q100 Grade 1 qualified (-40°C to +125°C ambient) with enhanced reliability testing including temperature cycling, HTOL, and ESD testing. It also has tighter process controls and traceability requirements. For automotive applications, always use the -AEC1 suffix version to ensure compliance with automotive quality standards.
Specify -AEC1 suffix for automotive applications. Contact sales for PPAP documentation support.