Data Sheet
MP6500 – 35V, 2.5A STEP MOTOR DRIVER W/ INTERNAL CURRENT SENSE
MP6500 Rev. 1.0 www.MonolithicPower.com 14
6/22/2017 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2017 MPS. All Rights Reserved.
The nENBL pin is used to control the output
drivers. When nENBL is low, the output H-bridge
outputs are enabled, and the rising edges on
STEP are recognized. When nENBL is high, the
H-bridge outputs are disabled, and the STEP
input is ignored. nENBL has an internal pull-
down resistor.
Fault Reporting
The MP6500 provides an nFAULT pin, which
reports if a fault condition (such as OCP, OTP,
or OVP) occurs. nFAULT is an open-drain output
and is driven low when a fault condition occurs.
If the fault condition is removed, nFAULT is
pulled high by an external pull-up resistor.
Over-Current Protection (OCP)
Over-current protection (OCP) circuitry limits the
current through the MOSFETs by disabling the
gate driver. If the over-current limit threshold is
exceeded for longer than the over-current
deglitch time, all MOSFETs in the H-bridge are
disabled, and nFAULT is driven low. The driver
remains disabled for 2.4ms typically, at which
time it is re-enabled automatically.
Over-current conditions on both high- and low-
side devices (i.e.: a short to ground, supply, or
across the motor winding) result in an over-
current shutdown. Note that OCP does not use
the current sense circuitry used for PWM current
control.
Over-Voltage Protection (OVP)
If the input voltage on VIN is higher than the
over-voltage protection (OVP) threshold, the H-
bridge output is disabled, and nFAULT is driven
low. This protection is released when VIN drops
below 36V.
Input Under-Voltage Lockout (UVLO)
Protection
If at any time the voltage on VIN falls below the
under-voltage lockout (UVLO) threshold voltage,
all circuitry in the device is disabled, and the
internal logic is reset. Operation resumes when
VIN rises above the UVLO threshold.
Thermal Shutdown
If the die temperature exceeds safe limits, all
MOSFETs in the H-bridge are disabled, and
nFAULT is driven low. Once the die temperature
has fallen to a safe level, operation resumes
automatically.