DESCRIPTION

The MP6543 family of products are all threephase brushless DC motor drivers. They

integrate three half-bridges, consisting of six Nchannel power MOSFETs, along with predrivers, gate drive power supplies, and currentsense amplifiers.

The MP6543 has ENABLE and PWM inputs for

each ½-H-bridge. The MP6543A has separate

high-side and low-side inputs, while the

MP6543B has Hall-element inputs. Otherwise,

they are similar. References to the MP6543 in

this document apply to the other parts, unless

otherwise noted.

The MP6543 is able to deliver up 2A

continuously (depending on thermal and PCB

conditions), with the adjustable over-current

protection threshold. It uses an internal charge

pump to generate the gate drive supply voltage

for the high-side MOSFETs, and a tricklecharge circuit to maintain sufficient gate drive

voltage to operate at 100% duty cycle.

Internal safety features include thermal

shutdown, under-voltage lockout (UVLO), and

over-current protection (OCP).

The MP6543, MP6543A, and MP6543B are

available in a 24-pin, 3mmx4mm QFN package

with an exposed thermal pad.

FEATURES

 3V to 12V Operating Supply Voltage

 Three Integrated Half-Bridge Drivers

 2A Continuous Output Current

 MOSFET On Resistance: 110mΩ per FET

 MP6543: ENBL & PWM Inputs

MP6543A: LS & HS Inputs

MP6543B: Hall-Signal Inputs

 Built-In 3.3V, 100mA LDO Regulator

 Internal Charge Pump Supports 100% Duty

Cycle Operation

 Automatic Synchronous Rectification

 Under-Voltage Lockout (UVLO) and

Thermal Shutdown Protection

 Over-Current Protection (OCP) with

Adjustable Threshold

 Integrated Bidirectional Current-Sense

Amplifiers

 Available in a QFN-24 (3mmx4mm)

Package

APPLICATIONS

 Three-Phase BLDC Motor Drivers