Texas Instruments DRV8251ADDAR

Overview

DRV8251ADDAR from Texas Instruments is an N-channel H-bridge brushed DC motor driver with integrated current mirror sensing and regulation, operating from 4.5 V to 48 V supply, delivering up to 4.1-A peak output current, supporting 1.8-V/3.3-V/5-V logic inputs, and featuring ultra-low 1-µA sleep current at 24 V - used in vacuum robots and medical bed controllers for precise stall detection and closed-loop torque control.

For engineers reviewing the DRV8251ADDAR datasheet, DRV8251ADDAR pinout, DRV8251ADDAR application, or DRV8251ADDAR equivalent, key selection considerations include its 450-mΩ R_DS(on), internal IPROPI current mirror architecture (eliminating external shunt resistors), fixed off-time current regulation with VREF threshold setting, auto-retry overcurrent protection, and HSOP-8 PowerPAD™ thermal package compatibility.

Technical Context

The DRV8251ADDAR implements a fully enhanced N-channel H-bridge using an internal charge pump to drive high-side FETs without external bootstrap circuitry, enabling true 100% duty cycle operation. Its dual-input logic interface (IN1/IN2) supports forward, reverse, brake, and coast modes with automatic dead-time insertion (200 ns) to prevent shoot-through.

Current sensing relies on low-side MOSFET current mirrors feeding the IPROPI pin with 1575 µA/A scaling and ±5% total gain error; regulation uses a comparator-based fixed off-time (25 µs) chopping scheme triggered by VREF voltage across RIPROPI, independent of microcontroller intervention during stall events.

Key Specifications

Pinout & Package

Package: HSOP-8 with PowerPAD™ (4.9 mm × 6.0 mm); exposed thermal pad must be soldered to PCB ground plane with multiple vias for optimal thermal dissipation (R_θJB = 14.4 °C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar brushed DC motor driver applications.

Compared with DRV8251ADDAR, DRV8251DDAR adds external sensing complexity but offers flexibility in gain and offset tuning, while DRV8231ADDAR trades voltage headroom and conduction loss for lower cost in sub-33 V applications - neither is pin-compatible drop-in replacements due to distinct current-sense architectures and voltage ratings.

Availability

DRV8251ADDAR is available at Aetrix Electronics and suitable for vacuum robot drive systems, medical bed actuation, and coffee machine pump control requiring stable component supply, long-term manufacturability, and automotive-grade reliability under thermal cycling.

Supply support for DRV8251ADDAR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in motor control ICs and industrial-grade reliability validation.

The DRV8251A product line delivers scalable, pin-compatible brushed DC motor drivers with integrated current sensing and protection - designed specifically for space-constrained, thermally demanding applications in home appliances, medical equipment, and robotics.

FAQ

What is the maximum continuous output current supported by the DRV8251ADDAR?

The DRV8251ADDAR supports 4.1-A peak output current at V_VM ≥ 5.5 V, but continuous current depends on PCB thermal design. With recommended HSOP-8 PowerPAD™ layout (multi-layer ground plane, ≥6 vias), it sustains ~3.0 A continuously at 24 V ambient without exceeding 125°C junction temperature, per R_θJB = 14.4 °C/W and power dissipation calculations.

How does the DRV8251ADDAR implement current regulation without an external shunt resistor?

The DRV8251ADDAR uses an internal current mirror architecture on the low-side MOSFETs to generate an analog current output (IPROPI) proportional to motor current at 1575 µA/A. This current flows through an external RIPROPI resistor to create a voltage compared against VREF, triggering fixed off-time (25 µs) PWM chopping - eliminating need for power shunt and associated layout area or heat.

Can the DRV8251ADDAR operate with 1.8-V logic inputs?

Yes, the DRV8251ADDAR supports 1.8-V, 3.3-V, and 5-V logic inputs. Its IN1 and IN2 pins have VIH = 1.5 V (min) and VIL = 0.5 V (max), with 200-mV hysteresis, ensuring robust noise immunity and compatibility with modern low-voltage MCUs without level-shifting circuitry.

What protection features are integrated into the DRV8251ADDAR?

The DRV8251ADDAR integrates VM undervoltage lockout (UVLO, 4.3 V rising), auto-retry overcurrent protection (OCP, 4.1-A trip with 3-ms retry), and thermal shutdown (TSD, 150°C activation with 40°C hysteresis). All protections operate autonomously without MCU intervention and are validated across –40°C to 125°C ambient.

Is the DRV8251ADDAR pin-compatible with other devices in the DRV82xx family?

No - while DRV8251ADDAR shares the HSOP-8 DDA package and pinout with DRV8251DDAR and DRV8231ADDAR, it is not functionally pin-compatible with DRV8870 or DRV8231 due to differences in current-sense architecture (mirror vs. shunt), OCP response (auto-retry vs. latched), and supply voltage range (4.5–48 V vs. 6.5–45 V or 4.5–33 V).