1 Features

• AEC-Q100 Qualified for Automotive

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• PWM Microstepping Stepper Motor Driver

– Simple STEP/DIR Interface

– Up to 1/256 Microstepping Indexer

• Integrated Current Sense Functionality

– No Sense Resistors Required

– ±4% Full-Scale Current Accuracy

• Smart tune ripple control decay

• Stall Detection using GPIO pins

• 4.5 to 48V Operating Supply Voltage Range

• Low RDS(ON): 330mΩ HS + LS at 24V, 25°C

• High Current Capacity: 2.5A Full-Scale, 1.8A rms

• Supports 1.8V, 3.3V, 5.0V Logic Inputs

• Low-Current Sleep Mode (2 μA)

• Spread spectrum clocking for low EMI

• Small Package and Footprint

• Protection Features

– VM Undervoltage Lockout (UVLO)

– Charge Pump Undervoltage (CPUV)

– Overcurrent Protection (OCP)

– Sensorless stall detection

– Open Load Detection (OL)

– Thermal Shutdown (OTSD)

– Fault Condition Output (nFAULT)

2 Applications

• Automotive bipolar stepper motors

• Headlight position adjustment

• Head-up display (HUD)

• HVAC stepper motors

• Electronic fuel injection (EFI)

• Electronic expansion valves (EEV)

3 Description

The DRV8434-Q1 is a stepper motor driver for

automotive applications. The device is fully integrated

with two N-channel power MOSFET H-bridge drivers,

a microstepping indexer, and integrated current

sensing. The DRV8434-Q1 is capable of driving up

to 2.5A full-scale output current (dependent on PCB

thermal design).

The DRV8434-Q1 uses an internal current sense

architecture to eliminate the need for two external

power sense resistors, saving PCB area and system

cost. The device uses an internal PWM current

regulation scheme with smart tune ripple control

decay. Smart tune automatically adjusts for optimal

current regulation, compensates for motor variation

and aging effects and reduces audible noise from the

motor.

A simple STEP/DIR interface allows an external

controller to manage the direction and step rate of

the stepper motor. The device can be configured in

full-step to 1/256 microstepping. A low-power sleep

mode is provided using a dedicated nSLEEP pin.

The DRV8434-Q1 features advanced stall detection

algorithm configurable by two digital IO and one

analog IO pins, and does not require an SPI interface

to detect stall. By detecting motor stall, system

designers can identify if the motor was obstructed

and take action as needed which can improve

efficiency, prevent damage and reduce audible noise.

Other protection features include supply undervoltage,

charge pump faults, overcurrent, short circuits, open

load, and overtemperature. Fault conditions are

indicated by the nFAULT pin.