MPQ6610

– 55V, 3A HALF-BRIDGE DRIVER, AEC-Q100 QUALIFIED

MPQ6610 Rev. 1.0

www.MonolithicPower.com

12

11/20/2020

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Charge Pump and Bootstrap

To generate the high-side gate drive voltage for

the internal N-channel high-side MOSFET (HS-

FET),

a

bootstrap

capacitor

is

used

in

conjunction with an internal trickle charge

pump. The bootstrap capacitor provides the

high peak current required to switch the

MOSFET quickly, and the internal trickle charge

pump keeps the bootstrap capacitor charged

during long periods when the output is not

switching.

Input Logic

Each MOSFET in the MPQ6610 is controlled

independently using the IN and EN pins (see

Table 1).

Table 1: Input Logic Table

EN

IN

OUT

0

0

Hi-Z

0

1

Hi-Z

1

0

Low

1

1

High

The input pins are designed such that they can

be driven with a logic level voltage even when

the main power to the device is inactive.

Protection and Diagnostic Functions

The MPQ6610 provides an nFAULT pin, which

is driven active low if any of the protection

circuits are activated. These fault conditions

include over-current (OC) and over-temperature

protection

(OTP),

as

well

as

open-load

detection. nFAULT is not driven low if a current

limit trip occurs. nFAULT is an open-drain

output, and requires an external pull-up resistor.

When the fault condition is removed, the

nFAULT pin is pulled inactive high by the pull-

up resistor.

Over-Current Protection (OCP)

If the current through any MOSFET exceeds

the over-current (OC) threshold for longer than

the over-current deglitch time, an over-current

fault is triggered.

If an OC fault occurs, the state of the output is

reversed until the current approaches 0A. Then

both MOSFETs are disabled, and the nFAULT

pin is driven low. The driver remains disabled

for about 1.6ms, then is automatically re-

enabled.

OC conditions are sensed on both the high-side

(HS) and low-side (LS) devices. OC conditions

include a short to ground, to supply, or across

the motor winding, which results in an over-

current shutdown). Note that OCP does not use

the same current-sense circuitry that is used for

PWM current control, so it is independent of the

ISET resistor value.

Open-Load Detection

When the output is in a high-impedance state

(EN = 0), the internal circuits pull the OUT pin to

VIN / 2 by a weak current. If a load is connected

between OUT and ground, then the load pulls

the OUT pin close to ground. If a load is

connected to VIN, then OUT is pulled close to

the value on VIN.

If the voltage on OUT (VOUT) is almost VIN / 2,

an open-load condition is detected, and the

nFAULT pin is driven active low. The fault is

cleared when EN is made active.

Input

Under-Voltage

Lockout

(UVLO)

Protection

If the voltage on VIN (VIN) falls below the under-

voltage lockout (UVLO) threshold at any time,

all circuitry in the device is disabled and the

internal logic is reset. Once VIN exceeds the

UVLO

threshold,

the

MPQ6610

resumes

normal operation.

Over-Voltage Protection (OVP)

If VIN exceeds the over-voltage protection (OVP)

threshold, the device is disabled. Once VIN falls

below

the

OVP

threshold,

the

MPQ6610

resumes normal operation.

Thermal Shutdown

If the die temperature exceeds its safe limits, all

MOSFETs in the H-bridge are disabled, and the

nFAULT

pin

goes

low.

Once

the

die

temperature drops to a safe level, the device

automatically resumes normal operation.