Texas Instruments DRV8425EPWPR

Overview

DRV8425EPWPR from Texas Instruments is a dual H-bridge motor driver IC designed for bipolar stepper and brushed-DC motor control in industrial motion systems. It delivers 2-A full-scale stepper current or 3.2-A peak brushed-DC current, operates from 4.5 V to 33 V, integrates current sensing without external shunts (±5% accuracy), and supports PHASE/ENABLE control interface with Smart Tune Dynamic Decay and configurable 7–32 μs PWM off-time.

For engineers reviewing the DRV8425EPWPR datasheet, DRV8425EPWPR pinout, DRV8425EPWPR application, or DRV8425EPWPR equivalent, this page provides verified technical context, HTSSOP-28 package mapping, decay-mode configuration logic, thermal derating guidance, and validated alternatives for stepper and dual-DC motor drive designs requiring integrated current regulation and low EMI.

Technical Context

The DRV8425EPWPR integrates two N-channel H-bridges with internal current-sense MOSFETs and a charge pump regulator, eliminating external sense resistors and reducing board area. Its Smart Tune Dynamic Decay algorithm dynamically adjusts fast/slow decay ratio per PWM cycle based on real-time winding voltage, dI/dt, and supply variation - not fixed timing - to minimize ripple while maintaining step accuracy.

Control is implemented via PH/EN interface (not PWM), with independent ADECAY/BDECAY quad-level inputs selecting decay mode per bridge, and TOFF setting off-time at 7/16/24/32 μs. Protection includes VM UVLO (4.25 V), charge pump undervoltage lockout, overcurrent (3.2-A threshold), and thermal shutdown (150°C trip) with open-drain nFAULT reporting.

Key Specifications

Pinout & Package

DRV8425EPWPR uses the HTSSOP-28 (PWP) package with exposed thermal pad (9.7 mm × 4.4 mm), rated for 125°C ambient operation and optimized for PCB heat dissipation via the PowerPAD™ ground connection.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual H-bridge motor driver applications.

Compared with DRV8425EPWPR, DRV8424EPWPR offers 25% higher stepper current and lower conduction loss but requires more careful thermal design; DRV8426EPWPR maintains pin compatibility at 33 V but trades off 30% higher R_DS(ON) for extended voltage range - neither is drop-in, but both share identical layout and firmware interface.

Availability

DRV8425EPWPR is available at Aetrix Electronics and suitable for printers and scanners, factory automation systems, and office/home automation devices requiring stable component supply, long-term lifecycle support, and RoHS-compliant motor driver ICs.

Supply support for DRV8425EPWPR 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 and embedded processing technologies, with decades of expertise in motor control ICs and industrial-grade power management solutions.

DRV8425EPWPR belongs to TI's DRV84xx dual H-bridge family, engineered for cost-effective, space-constrained motion control in industrial, commercial, and consumer equipment where integrated current sensing and adaptive decay reduce system complexity.

FAQ

What is the maximum continuous current DRV8425EPWPR can deliver per H-bridge?

The DRV8425EPWPR supports 2-A full-scale current for stepper motor operation and 3.2-A peak current for brushed-DC motors under typical PCB thermal conditions. Continuous current depends on ambient temperature, copper area, and airflow; at 25°C with 2 oz copper and 2 in² thermal pad, derated RMS current is ~1.4 A per bridge per TI datasheet Section 6.3.

Does DRV8425EPWPR require external current sense resistors?

No, DRV8425EPWPR uses an internal current mirror architecture across its power MOSFETs to eliminate external shunt resistors. This achieves ±5% full-scale current accuracy while reducing BOM count, PCB area, and power loss - confirmed in TI datasheet Sections 1 and 7.3.3.

How does Smart Tune Dynamic Decay work in DRV8425EPWPR?

DRV8425EPWPR's Smart Tune Dynamic Decay continuously adapts the fast/slow decay ratio each PWM cycle based on real-time current error, dI/dt, and supply voltage. If overshoot occurs, it increases fast-decay percentage; if drive time is excessive, it reduces it - optimizing ripple and efficiency without user tuning, as detailed in Section 7.3.4.3.

What logic voltage levels are compatible with DRV8425EPWPR control inputs?

DRV8425EPWPR accepts 1.8-V, 3.3-V, and 5.0-V logic inputs on all control pins (APH, AEN, BPH, BEN, nSLEEP, etc.), with VIH ≥ 1.5 V and VIL ≤ 0.6 V specified across temperature. No level-shifting circuitry is needed when interfacing with common microcontrollers or FPGAs.

Can DRV8425EPWPR drive a single bipolar stepper motor?

Yes, DRV8425EPWPR is explicitly designed to drive one bipolar stepper motor using both H-bridges (AOUT1/AOUT2 and BOUT1/BOUT2) as phase A and phase B outputs. Its datasheet Section 3 and Feature list confirm full support for stepper operation up to 2-A full-scale current with microstepping compatibility via external indexer.