Texas Instruments DRV8824RHDT

Overview

DRV8824RHDT from Texas Instruments is a 28-pin VQFN-packaged bipolar stepper motor driver IC with integrated microstepping indexer, dual N-channel H-bridge output stage, and configurable decay modes. It operates from 8.2 V to 45 V, delivers up to 1.6 A per phase at 24 V/25°C, and supports 1/32 microstepping for precision motion control in compact automated equipment.

For engineers reviewing the DRV8824RHDT datasheet, DRV8824RHDT pinout, DRV8824RHDT application, or DRV8824RHDT equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world use cases in office automation and security systems, and two rigorously cross-checked alternative parts with documented functional differences.

Technical Context

The DRV8824RHDT integrates two independent NMOS H-bridge drivers with current-sense amplifiers (5× gain), fixed-frequency PWM current regulation, and an on-chip microstepping indexer that executes 1/32-step sequences without host processor intervention. Its charge-pump gate drive enables high-side FET operation across the full 8.2–45 V VM range.

Decay mode selection (slow/fast/mixed) is controlled by a single DECAY pin with internal 130 kΩ pullup and 80 kΩ pulldown, enabling mixed decay by default when left open. Protection includes overcurrent detection (1.8–5 A trip), thermal shutdown (150–180°C), VM undervoltage lockout (7.8–8.2 V), and fault reporting via open-drain nFAULT.

Key Specifications

Pinout & Package

DRV8824RHDT uses a 28-pin VQFN package (5.00 mm × 5.00 mm, 0.5 mm pitch) with exposed thermal pad (PPAD) for enhanced heat dissipation. Pin functions are validated per TI SLVSA06K Rev K (Jan 2022) datasheet Figure 5-2 and Table 5-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6600HG and LV8729V, the DRV8824RHDT uniquely combines 1.6-A drive capability, autonomous 1/32 microstepping, integrated 3.3-V regulation, and comprehensive fault reporting in a thermally efficient 5×5 mm VQFN-making it optimal for compact, self-contained motion modules requiring minimal external components.

Availability

DRV8824RHDT is available at Aetrix Electronics and suitable for office automation, video security, factory automation, and gaming machine applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for DRV8824RHDT 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 IC design and high-reliability industrial solutions.

The DRV8824RHDT belongs to TI's precision stepper motor driver product line, engineered specifically for compact, intelligent motion control in automated equipment where integration, thermal efficiency, and deterministic microstepping are critical.

FAQ

What is the maximum continuous output current of the DRV8824RHDT?

The DRV8824RHDT delivers up to 1.6 A of continuous current per phase at 24 V and 25°C ambient temperature with adequate heatsinking. This rating assumes proper PCB thermal design-including the exposed PPAD-and operation within recommended voltage (8.2–45 V) and temperature (–40°C to 85°C) ranges. Derating applies above 25°C per the RθJA value of 35.8°C/W for the RHD package.

Does the DRV8824RHDT require external components for microstepping operation?

No, the DRV8824RHDT includes a fully integrated microstepping indexer. Configuration of step resolution (full, 1/2, 1/4, 1/8, 1/16, or 1/32) is done solely via MODE0–MODE2 pins-no external clock, sequencer, or microcontroller firmware is needed to generate microstep waveforms. The indexer advances automatically on each STEP rising edge.

How does the DECAY pin function on the DRV8824RHDT?

The DECAY pin selects decay mode: logic low enables slow decay, logic high enables fast decay, and an open (unconnected) state enables mixed decay by default due to internal 130 kΩ pullup and 80 kΩ pulldown resistors. Mixed decay starts with fast decay for 75% of the PWM cycle, then switches to slow decay-optimizing torque smoothness and power efficiency simultaneously.

What protection features are built into the DRV8824RHDT?

The DRV8824RHDT integrates overcurrent protection (OCP), thermal shutdown (TSD), VM undervoltage lockout (UVLO), and fault condition reporting via the open-drain nFAULT pin. OCP triggers at 1.8–5 A per phase; TSD activates at 150–180°C junction temperature; UVLO disables operation below 7.8 V. All faults assert nFAULT low for system-level monitoring.

Can the DRV8824RHDT operate without an external 3.3-V supply?

Yes-the DRV8824RHDT includes an internal 3.3-V regulator (V3P3OUT) capable of supplying up to 1 mA. This output can directly power the AVREF and BVREF pins or external logic, eliminating the need for an external LDO in most designs. A 0.47-μF ceramic capacitor must be placed between V3P3OUT and GND for stability.