MP6545A 4.5-45V, 2.5A Simple Three-Phase Power Stage QFN-28

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MP6545A 4.5-45V, 2.5A Simple Three-Phase Power Stage QFN-28

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MPS QFN-28 Power Management Motor Drivers & Controllers

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MP6545A 4.5-45V, 2.5A Simple Three-Phase Power Stage QFN-28

The MPS MP6545A is a Simple Three-Phase Power Stage. It operates from a 4.5 V to 45 V input and is rated for 2.5 A. It is supplied in a QFN-28 package.

The MP6545A is a three-phase power stage IC designed to drive brushless DC (BLDC) motors or other loads.

Key Specifications

Part Number	MP6545A
Function	Simple Three-Phase Power Stage
Input Voltage	4.5 V to 45 V
Current Rating	2.5 A
Package	QFN-28
Ordering Codes	MP6545A

Features

4.5V to 45V Operating Input Voltage (VIN) Range
2.5A Maximum Output Current (IOUT_MAX)
Three-Channel Half-Bridge (HB) Driver
Low 150mΩ On Resistance (RDS(ON)) per MOSFET
Protection Functions Include: o Over-Current Protection (OCP) o Over-Voltage Protection (OVP) o Under-Voltage Lockout (UVLO) o Over-Temperature (OT) Shutdown o Fault Indication Output
Available in QFN-28 (4mmx5mm) and TSSOP-28EP Packages

Typical Application Circuit

Applications

Brushless DC (BLDC) Motors
Laser Printers and Copiers

Design Notes

Set dead time to match the external FET turn-off, not the datasheet typical. Too little risks shoot-through, too much distorts the current waveform at low duty cycle.
Use a Kelvin connection for the current-sense resistor; shared copper injects switching noise straight into the sense amplifier.
The thermal pad is the only heat path for most packages — via-stitch it to a ground plane with at least 9 vias.
PWM frequency trades switching loss against current ripple in the motor inductance; 20 kHz keeps the drive out of the audible band.
Add a brake or coast path so regeneration during a fast stop does not pump the supply rail.