Overview
The DRV8870DDA is a brushed-DC motor driver produced by Texas Instruments. This device is designed to drive one DC motor, one winding of a stepper motor, or other loads. It is particularly suited for applications in printers, appliances, industrial equipment, and other small machines. The DRV8870DDA features an H-bridge driver consisting of four N-channel MOSFETs, allowing for bidirectional motor control with up to 3.6-A peak current. The device supports pulse-width modulation (PWM) for motor speed control and includes integrated current regulation to limit motor current to a predefined maximum.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | HSOP (DDA) | |
| Pins | 8 | |
| Operating Voltage Range | 6.5 to 45 | V |
| Peak Current Drive | 3.6 | A |
| Typical RDS(on) (HS + LS) | 565 mΩ | |
| Operating Temperature Range | -40 to 125 | °C |
| Package Size | 4.9 × 6.0 mm | |
| Junction-to-Ambient Thermal Resistance (RθJA) | 41.1 | °C/W |
Key Features
- H-Bridge Motor Driver: Drives one DC motor, one winding of a stepper motor, or other loads.
- Wide Operating Voltage Range: 6.5-V to 45-V.
- PWM Control Interface: Supports motor speed control through PWM.
- Integrated Current Regulation: Limits motor current to a predefined maximum based on the analog input VREF and the voltage on the ISEN pin.
- Low-Power Sleep Mode: Entered by setting both inputs low.
- Small Package and Footprint: 8-pin HSOP with PowerPAD™, 4.9 × 6.0 mm.
- Integrated Protection Features:
- VM Undervoltage Lockout (UVLO)
- Overcurrent Protection (OCP)
- Thermal Shutdown (TSD)
- Automatic Fault Recovery
Applications
The DRV8870DDA is commonly used in various applications including:
- Printers
- Appliances
- Industrial Equipment
- Other mechatronic applications
Q & A
- What is the operating voltage range of the DRV8870DDA?
The operating voltage range is 6.5-V to 45-V.
- What is the peak current drive capability of the DRV8870DDA?
The peak current drive is up to 3.6-A.
- How does the DRV8870DDA control motor speed?
Motor speed can be controlled using pulse-width modulation (PWM).
- What protection features are integrated into the DRV8870DDA?
The device includes VM undervoltage lockout (UVLO), overcurrent protection (OCP), thermal shutdown (TSD), and automatic fault recovery.
- How does the DRV8870DDA enter low-power sleep mode?
The device enters sleep mode by setting both logic inputs (IN1 and IN2) low.
- What is the purpose of the VREF and ISEN pins in the DRV8870DDA?
The VREF and ISEN pins are used for integrated current regulation, where VREF sets the maximum current limit and ISEN senses the motor current through an external sense resistor.
- What is the typical RDS(on) of the DRV8870DDA?
The typical RDS(on) is 565 mΩ (including one high-side and one low-side FET).
- What is the package type and size of the DRV8870DDA?
The package type is HSOP (DDA) with a size of 4.9 × 6.0 mm.
- How does the DRV8870DDA handle overcurrent conditions?
If the output current exceeds the OCP threshold, the device disables all FETs in the H-bridge for a duration of tRETRY before re-enabling them according to the state of the INx pins.
- What is the thermal shutdown temperature for the DRV8870DDA?
The device shuts down if the die temperature exceeds 150°C and resumes operation once the temperature falls below a safe level.
