MP6604C

– 4.5V TO 45V, 2.5A, SIMPLE DUAL H-BRIDGE DRIVER (HS/LS)

MP6604C Rev. 1.1

MonolithicPower.com

12

5/12/2023

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OPERATION

The MP6604C is a general-purpose dual H-

bridge motor driver designed to drive bipolar

stepper motors, brushed DC motors, solenoids,

and other loads. It integrates eight N-channel

power MOSFETs connected as four half H-

bridges, with a 2.5A current capability. The

device operates across a wide 4.5V to 45V

supply input voltage (VIN) range.

nSLEEP and nRESET

Pull the nSLEEP pin low to force the MP6604C

to enter low-power sleep mode. In this mode,

the gate drive charge pump stops, and all the

internal

circuits

and

H-bridge

outputs

are

disabled. All inputs are ignored when nSLEEP

is active low.

When

waking

up

from

sleep

mode,

approximately 600µs must pass before driving

the motor. This allows the internal circuitry to

stabilize. nSLEEP has an internal pull-down

resistor.

Pull the nRESET pin low to reset the latched

protection

features,

including

over-current

protection (OCP) and over-voltage protection

(OVP), as well as to disable the outputs to a

high-impedance (Hi-Z) state.

Input Interface

The MP6604C contains four half H-bridges that

operate independently.

The MP6604C has high-side (HS) and low-side

(LS) inputs for each of the output pins. Table 2

shows the input logic.

Table 2: HS and LS Input Logic

xHSx

xLSx

xOUTx

0

0

Hi-Z

0

1

L

1

0

H

1

1

Hi-Z

Note that all logic inputs have weak, internal

pull-down resistors.

Automatic Synchronous Rectification

If the output high-side MOSFET (HS-FET) and

low-side MOSFET (LS-FET) are turned off, then

the recirculation current must continue to flow

when driving current through an inductive load.

This current is typically passed through the

MOSFET body diodes. To prevent excess

power dissipation in the body diodes, the

MP6604C implements automatic synchronous

rectification.

If both the HS-FET and LS-FET are turned off,

and the voltage on an xOUTx pin (VxOUTx) is

pulled below ground, then the corresponding

LS-FET turns on until the current flowing

through it approaches 0A, or the HS-FET turns

on. Similarly, if VxOUTx exceeds VIN, then the

corresponding

HS-FET

turns

on

until

the

current approaches 0A, or the LS-FET turns on.

Internal Supply Voltages (VREG and VCP)

The internal regulators generate a 5V supply

voltage (VREG) for the LS gate drive, and a

supply exceeding VIN by 5V (VCP) for the HS

gate drive. These supplies require external

capacitors.

The

VREG

pin

requires

a

1µF

ceramic

capacitor connected to ground. The VCP pin

requires a 1µF ceramic capacitor connected to

VIN. Both capacitors should be X7R ceramic

capacitors, and rated for a voltage of at least

16V.

Connect the charge pump flying capacitor

between the CPA and CPB pins using a 100nF

ceramic capacitor (X7R) that is rated for at least

the maximum VIN.

nFAULT

The MP6604C provides a nFAULT pin to report

to the system if a fault condition such as OCP,

OVP, or over-temperature protection (OTP)

occur. nFAULT is an open-drain output, and is

pulled low during fault conditions. If used,

nFAULT should be pulled high via an external

pull-up resistor.