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.
PART NUMBER | PACKAGE | PACKAGE SIZE (2) |
---|---|---|
DRV8421ADGQ | HVSSOP (10) | 3.00mm × 3.00mm |
DRV8214BDGQ | HVSSOP (10) | 3.00mm × 3.00mm |
DRV8421ADFU | SSOP (10) | 3.90mm × 4.90mm |
DRV8421BDFU | SSOP (10) | 3.90mm × 4.90mm |
Part Number | Package | Supply VM (V) |
RDS(ON)
(mΩ) |
Overcurrent Protection (OCP) Limit (A) |
Current Regulation | Current Sense | Package Size |
---|---|---|---|---|---|---|---|
DRV8421 | HVSSOP (10) | 4 to 18 | 900 | 2 | No | No | 3.0mm x 3.0mm |
SSOP (10) | 4 to 18 | 900 | 2 | No | No | 3.9mm x 4.9mm | |
DRV8848 | HTSSOP (16) | 4 to 18 | 900 | 2 | Yes | External Shunt Resistor | 5.0mm x 6.4mm |
DRV8410 | HTSSOP (16) | 1.65 to 11 | 800 | 2.5 | Yes | External Shunt Resistor | 5.0mm x 6.4mm |
WQFN (16) | 1.65 to 11 | 800 | 2.5 | Yes | External Shunt Resistor | 3.0mm x 3.0mm | |
Thin-SOT (16) | 1.65 to 11 | 800 | 2.5 | Yes | External Shunt Resistor | 4.2mm x 2.0mm | |
DRV8411 | HTSSOP (16) | 1.65 to 11 | 400 | 4 | Yes | External Shunt Resistor | 5.0mm x 6.4mm |
WQFN (16) | 1.65 to 11 | 400 | 4 | Yes | External Shunt Resistor | 3.0mm x 3.0mm | |
Thin-SOT (16) | 1.65 to 11 | 400 | 4 | Yes | External Shunt Resistor | 4.2mm x 2.0mm | |
DRV8411A | HTSSOP (16) | 1.65 to 11 | 400 | 4 | Yes | Current Mirror (IPROPI) | 5.0mm x 6.4mm |
WQFN (16) | 1.65 to 11 | 400 | 4 | Yes | Current Mirror (IPROPI) | 3.0mm x 3.0mm | |
Thin-SOT (16) | 1.65 to 11 | 400 | 4 | Yes | Current Mirror (IPROPI) | 4.2mm x 2.0mm |
PIN | TYPE(1) | DESCRIPTION | |||
---|---|---|---|---|---|
NAME | NO. | ||||
4-wire input (8421A) | 2-wire input (8421B) | ||||
IN1 | 2 | 3 | I | Input 1 | Controls OUT1 |
IN2 | 3 | 4 | I | Input 2 | Controls OUT2 |
IN3 | 4 | - | I | Input 3 | Controls OUT3 |
IN4 | 5 | - | I | Input 4 | Controls OUT4 |
EN | - | 2 | I | Enable Pin | Enable or sleep mode input. Device enables with pin pulled high; sleep mode activated with pin pulled low for time more than tSLEEP |
nFAULT | - | 5 | OD | Fault Indication Pin | Pulled logic low with fault condition; open-drain output requires external pullup |
OUT1 | 10 | 10 | O | Output 1 | Controls OUT1; internal pulldown |
OUT2 | 9 | 9 | O | Output 2 | Controls OUT2; internal pulldown |
OUT3 | 8 | 8 | O | Output 3 | Controls OUT3; internal pulldown |
OUT4 | 7 | 7 | O | Output 4 | Controls OUT4; internal pulldown |
GND | 6 | 6 | PWR | Device ground | GND pin to be connected to ground |
VM | 1 | 1 | PWR | Power supply | Connect to motor power supply; bypass to GND with a 0.1 and 10μF (minimum) ceramic capacitor rated for VM |
COMPONENT | PIN 1 | PIN 2 | RECOMMENDED |
---|---|---|---|
CVM | VM | GND | 10µF (minimum) ceramic capacitor rated for VM |
CVM | VM | GND | 0.1µF ceramic capacitor rated for VM |
RnFAULT | VCC(1) | nFAULT | >1kΩ |