Packaging information
| Package | Pins SSOP (DFU) | 10 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 4,000 | LARGE T&R |
Features for the DRV8421
- 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:
- 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)
Description for the DRV8421
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.