MP6614

– 35V, H-BRIDGE DC MOTOR DRIVER WITH SOIC-8 PACKAGE

MP6614 Rev. 1.0

MonolithicPower.com

12

2/24/2023

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© 2023 MPS. All Rights Reserved.

Input Logic

The MP6614 is controlled by a PWM input

interface

that

is compatible with industry-

standard devices. Table 1 shows the MP6614

’s

input logic:

Table 1: Input Logic

IN1

IN2

OUT1

OUT2

Function

(DC Motor)

L

L

Hi-Z

Hi-Z

Coast (enter sleep

mode after 2ms)

L

H

L

H

Reverse current

(OUT2 to OUT1)

H

L

H

L

Forward current

(OUT1 to OUT2)

H

H

L

L

Brake (low-side

slow decay)

nSLEEP Operation

If the input pins (IN1 and IN2) remain low for

2ms, then the MP6614 enters a low-power

sleep mode. In this state, all unnecessary

internal circuitry shuts down. If the device starts

up while both inputs are low, then the MP6614

immediately enters sleep mode. If either IN1 or

IN2 are pulled high for a minimum 50ns, the

device exits sleep mode and resumes normal

operation after 250

μs.

Over-Current Protection (OCP)

The over-current protection (OCP) circuit limits

the current through each MOSFET by reducing

the gate driver voltage to the MOSFET. If the

MOSFET

’s current limit condition lasts longer

than the over-current (OC) deglitch time, all the

MOSFETs in the H-bridge are disabled. The

driver remains disabled for the OCP retry time

(tOCR) and then is re-enabled automatically.

OC conditions such as a short to ground,

supply, or across the motor winding are sensed

on both high-side (HS) and low-side (LS)

devices, resulting in an OC shutdown.

Note that OCP does not use the current-sense

circuitry used for PWM current control, and it is

independent of the ISET resistance.

Junction Over-Temperature Protection (OTP)

If the IC

’s junction temperature (TJ) exceeds

safe limits, the device stops switching. Once TJ

drops to a safe temperature, the IC resumes

normal operation.

Input

Under-Voltage

Lockout

(UVLO)

Protection

If VIN drops below the under-voltage lockout

(UVLO) threshold, all the circuitry in the device

is disabled, and the internal logic resets.

Operation resumes once VIN exceeds the UVLO

threshold.