DRV8251ADDAR (TI DRV8251A Brushed DC Motor H-Bridge Driver IC)

Suffix DDA: 8-pin PowerPAD HSOP package; R = tape & reel packaging; Version A: integrated current mirror, no high-power sense resistor required (this is the key difference from DRV8251 non-A version).

## Overview

TI integrated single N-channel H-bridge brushed DC motor driver IC. It integrates a charge pump and current mirror sensing circuit, with built-in current limiting and multi-level protection.

**Key highlight: integrated current sensing eliminates external power sense resistor, simplifies PCB design and reduces BOM cost.** The motor forward/reverse rotation, speed regulation and stall detection can be directly controlled via MCU GPIO/PWM signals.

## Key Specifications

1. Topology: Single H-bridge (4 integrated NMOS transistors)

2. Power Supply VM: 4.5V ~ 48V, absolute maximum voltage rating 50V

3. Current: Peak current 4.1A

4. MOS On-resistance: Typical 450mΩ for combined HS+LS

5. Control Logic: Dual logic pins IN1/IN2 for PWM speed control, compatible with 1.8V / 3.3V / 5V MCU logic levels

6. PWM Frequency Range: 0~200kHz

7. Current Sensing: Integrated current mirror with IPROPI output; no external power sense resistor needed. VREF pin sets the current limit threshold.

8. Temperature Range: -40℃ ~ +150℃ (Junction Temperature TJ)

9. Package: HSOP8 (DDA with PowerPAD thermal pad, 4.9mm ×6.0mm), tape & reel

10. Protection Features: UVLO undervoltage lockout, latched OCP overcurrent protection, TSD thermal shutdown

11. Low Power: Sleep mode quiescent current <1μA

## Functions

1. Brushed DC Motor Drive: H-bridge output controls motor forward, reverse, brake and coast; PWM adjusts rotation speed.

2. Integrated Current Sensing & Current Limiting: IPROPI outputs a signal proportional to motor current. MCU reads this signal to implement **stall detection and load monitoring**. VREF sets maximum current limit to prevent damage to motor and power supply caused by inrush or stall current.

3. Solenoid and Relay Coil Drive: It can drive single-coil solenoids and electromagnetic actuators besides motors.

4. Charge Pump: Supports 100% duty-cycle continuous turn-on of high-side NMOS.

5. Low-power Sleep Mode: Enter sleep mode when both IN1 and IN2 are pulled low, drastically reducing quiescent current.

6. Comprehensive Fault Protection: Output automatically shuts down under undervoltage, overcurrent and overtemperature conditions to protect IC and downstream loads. Overcurrent protection is latched and requires reset for recovery.

## Applications

- Industrial Equipment: Small electric actuators, valves, solenoids, conveyors, miniature industrial pumps

- Robotics: Robot vacuum cleaners, small mobile robots, pan-tilt assemblies, small servo loads

- Office Equipment: Printers, scanners, automatic paper feeders

- Consumer Devices: Power tools, water pumps, fans, small electric lifting mechanisms

- Automotive Accessories: On-board small brushed motors, window / door lock auxiliary actuators (low-voltage brushed)

- Others: Vending machines, small transmission modules for medical devices

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> Positioning: Preferred solution for brushed DC motors within 48V with 4.1A peak current. Advantage: no power sense resistor required, saving PCB area and components. Not suitable for brushless motors.