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DRV8421

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18V, 2A dual H-bridge motor driver

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Data sheet

DRV8421

ACTIVE
Data sheet Order now

Product details

Number of full bridges 2 Vs (min) (V) 4 Vs ABS (max) (V) 20 Peak output current (A) 2 RDS(ON) (HS + LS) (mΩ) 900 Control mode PWM Control interface Hardware (GPIO) Features Low-Power Sleep Mode Rating Catalog Operating temperature range (°C) -40 to 125
Number of full bridges 2 Vs (min) (V) 4 Vs ABS (max) (V) 20 Peak output current (A) 2 RDS(ON) (HS + LS) (mΩ) 900 Control mode PWM Control interface Hardware (GPIO) Features Low-Power Sleep Mode Rating Catalog Operating temperature range (°C) -40 to 125
HVSSOP (DGQ) 10 14.7 mm² 3 x 4.9
  • Dual H-Bridge Motor Driver
    • Single/Dual Brushed DC
    • Stepper
    • Solenoids
  • 4 to 18V Operating Supply Voltage Range
  • Low ON-resistance: HS + LS = 900mΩ (Typical, 25°C)
  • High Output Current per H-Bridge
    • 2A Maximum Driver Current at 12V and TA = 25°C
    • Parallel Mode Available Capable of 4A Maximum Driver Current at 12V and TA = 25°C
  • Device versions:
    • DRV8421A (4-wire input): Independent Half Bridge Control
    • DRV8421B (2-wire input): Sleep Mode, Fault detect
  • Similar LV Stepper Drivers:
    • DRV8410: 1.65 to 11V (800mΩ RDS(ON))
    • DRV8411: 1.65 to 11V (400mΩ RDS(ON))
    • DRV8411A: 1.65 to 11V (400mΩ RDS(ON))
  • PWM Control Interface
  • Low-Current 3µA Sleep Mode (2-wire input version only)
  • Thermally-Enhanced Surface Mount Package
  • Protection Features
    • VM Undervoltage Lockout (UVLO)
    • Overcurrent Protection (OCP)
    • Thermal Shutdown (TSD)
    • Fault Condition Indication Pin (nFAULT) (2-wire input version only)
  • Dual H-Bridge Motor Driver
    • Single/Dual Brushed DC
    • Stepper
    • Solenoids
  • 4 to 18V Operating Supply Voltage Range
  • Low ON-resistance: HS + LS = 900mΩ (Typical, 25°C)
  • High Output Current per H-Bridge
    • 2A Maximum Driver Current at 12V and TA = 25°C
    • Parallel Mode Available Capable of 4A Maximum Driver Current at 12V and TA = 25°C
  • Device versions:
    • DRV8421A (4-wire input): Independent Half Bridge Control
    • DRV8421B (2-wire input): Sleep Mode, Fault detect
  • Similar LV Stepper Drivers:
    • DRV8410: 1.65 to 11V (800mΩ RDS(ON))
    • DRV8411: 1.65 to 11V (400mΩ RDS(ON))
    • DRV8411A: 1.65 to 11V (400mΩ RDS(ON))
  • PWM Control Interface
  • Low-Current 3µA Sleep Mode (2-wire input version only)
  • Thermally-Enhanced Surface Mount Package
  • Protection Features
    • VM Undervoltage Lockout (UVLO)
    • Overcurrent Protection (OCP)
    • Thermal Shutdown (TSD)
    • Fault Condition Indication Pin (nFAULT) (2-wire input version only)

The DRV8421 provides a dual H-bridge motor driver for home appliances and other mechatronic applications. The device can be used to drive one or two DC motors, a bipolar stepper motor, or other loads. A simple PWM interface allows easy interfacing to controller circuits.

The output block of each H-bridge driver consists of N-channel power MOSFETs configured as full H-bridges to drive the motor windings. The DRV8421 is capable of driving a maximum current of 2A from each output or 4A in parallel mode (with proper heat sinking, at 12V and TA = 25°C).

The device contains two versions having a 4-wire input (DRV8421A) or a 2-wire input (DRV8421B). The 2-wire input version (DRV8421B) contains features like enable and fault detection, while the 4-wire input version (DRV8421A) can drive four half bridges based on signals to four input terminals. A low-power sleep mode is also provided for the 2-wire input version. It shuts down internal circuitry to achieve very-low quiescent current draw. This sleep mode can be set by pulling the enable pin low.

Internal protection functions are provided for UVLO, OCP, short-circuit protection, and overtemperature. Fault conditions are indicated by a nFAULT pin in the DRV8421B, the 2-wire input device.

The DRV8421 provides a dual H-bridge motor driver for home appliances and other mechatronic applications. The device can be used to drive one or two DC motors, a bipolar stepper motor, or other loads. A simple PWM interface allows easy interfacing to controller circuits.

The output block of each H-bridge driver consists of N-channel power MOSFETs configured as full H-bridges to drive the motor windings. The DRV8421 is capable of driving a maximum current of 2A from each output or 4A in parallel mode (with proper heat sinking, at 12V and TA = 25°C).

The device contains two versions having a 4-wire input (DRV8421A) or a 2-wire input (DRV8421B). The 2-wire input version (DRV8421B) contains features like enable and fault detection, while the 4-wire input version (DRV8421A) can drive four half bridges based on signals to four input terminals. A low-power sleep mode is also provided for the 2-wire input version. It shuts down internal circuitry to achieve very-low quiescent current draw. This sleep mode can be set by pulling the enable pin low.

Internal protection functions are provided for UVLO, OCP, short-circuit protection, and overtemperature. Fault conditions are indicated by a nFAULT pin in the DRV8421B, the 2-wire input device.
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* Data sheet DRV8421 18V 2A Dual H-Bridge Stepper Driver datasheet PDF | HTML 17 Jun 2024

Design & development

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Evaluation board

DRV8421BEVM — DRV8421B evaluation module

The DRV8421 evaluation module (EVM) allows for easy evaluation of the DRV8421 device. The EVM has been programmed and configured to work out of the box and begin spinning motors right away. The device can be used to drive one or two DC motors, a bipolar stepper motor, or other loads up to a maximum (...)

User guide: PDF | HTML
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Gerber file

DRV8421xEVM Hardware Files (Rev. A)

SLVC853A.ZIP (5670 KB)
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