MP6507 –2.7V-TO-15V, 700mA, STEPPER MOTOR DRIVER

MP6507 Rev. 1.05

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4/30/2018

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from sleep mode, though there is a delay time of

~1ms until the internal circuitry stabilizes.

Blanking Time

There is usually a current spike during the

switching transition due to the body diode’s

reverse-recovery current or the distributed

inductance or capacitance. This current spike

requires filtering to prevent it from erroneously

shutting down the high-side MOSFET. An

the current sense comparator when the outputs

are switched, which is also the minimum on time

for high-side MOSFET.

Enable

If all the inputs (AIN1, AIN2, BIN1 and BIN2) are

logic low, the MP6507’s outputs are disabled

while the charger pump and internal regulator

remain active.

Synchronous Rectifier

The MP6507 enters a synchronous rectifier (SR)

mode during the constant off-time period when

the current limit threshold is exceeded, and the

load current freewheels in slow decay SR mode.

In slow decay mode, the current freewheels

through one low-side MOSFET and the body

diode of the other low-side MOSFET to short the

winding. The SR mode enables both two low-side

MOSFETs, which feature a lower voltage drop

and lower power dissipation during decay

operation.

Thermal Shutdown

The junction temperature of the IC is internally

monitored. If the junction temperature exceeds

the threshold value (typically 165ºC), the

converter is shut down (the fault pin goes low)

and recoveries once the junction temperature

drops to about 150ºC (15ºC hysteresis).

UVLO protection

The MP6507 has UVLO protection. When the

VIN exceeds the UVLO rising threshold, the

MP6507 powers up. It shuts off when VIN drops

below the UVLO falling threshold.