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