DRV8844A中文资料德州仪器数据手册PDF规格书

1 Features

• Four-channel half-bridge driver

– Independent control of each half-bridge

– Can be used as low-side or high-side switch

– Outputs can be connected in parallel

• Low MOSFET RDS(ON): 210mΩ per FET

– 2.5A Maximum Drive Current at 24V, 25°C

• Bipolar power supply support up to ±32.5V

• 8V to 65V operating supply voltage range

• Separate power grounds for connection of

optional sense resistors

• Can drive various types of loads -

– Four solenoids, valves, or relays

– Two brushed-DC motors

– One stepper motor

– One or two Peltier thermoelectric coolers (TEC)

– One 3-phase brushless-DC (BLDC) motor

• Built-in 3.3V, 10mA LDO regulator

• Industry standard IN/EN digital control interface

• Protection features

– VM undervoltage lockout (UVLO)

– Overcurrent protection (OCP)

– Thermal shutdown (TSD)

– Fault condition output (nFAULT)

2 Applications

• Textile Machines

• Office Automation Machines

• Gaming Machines

• Factory Automation

• Motor Drive

• Stage Lighting

• Thermoelectric Coolers (TEC)

3 Description

The DRV8844A is a four-channel, individually

controllable half-bridge driver for a wide range of

applications. The device supports up to 2.5A peak

or 1.75A RMS output current at 24V and 25°C

with proper PCB heatsinking. The output stage of

the device consists of N-channel power MOSFETs

configured as four independent half-bridges, allowing

the device to be used for driving two DC motors,

one stepper motor, four solenoids, or other loads.

Each output can be a LS switch (low-side switch), HS

switch (high-side switch), or a push-pull output driver.

Separate inputs to independently control each 1/2-

H-bridge are provided. To allow operation with

split (positive and negative) power supplies, the

logic inputs and nFAULT output are referenced to

a separate floating ground pin. Additionally, the

DRV8844A supports the connection of sense resistors

on each individual half-bridge, allowing for current

sensing at the system level for applications such as

motor control.

Internal shutdown functions are provided for

over current protection, short circuit protection,

undervoltage lockout, and overtemperature.