Texas Instruments DRV8847RTET

Overview

DRV8847RTET from Texas Instruments is a dual H-bridge motor driver IC designed for driving two brushed DC motors, one bipolar stepper motor, or solenoid loads in industrial and appliance systems. It operates from 2.7 V to 18 V, delivers 1-A RMS per bridge at 25°C, features 1000 mΩ total R_DS(ON) (HS + LS) at V_M > 5 V, and supports 4-pin, 2-pin, parallel, and independent bridge control interfaces.

For engineers reviewing the DRV8847RTET datasheet, DRV8847RTET pinout, DRV8847RTET application, or DRV8847RTET equivalent, this page provides verified package mapping (16-pin WQFN with thermal pad), confirmed current regulation (20-μs fixed off-time), torque scalar functionality, open-load detection, and fault reporting via nFAULT - all critical for motor control BOM validation and layout planning.

Technical Context

The DRV8847RTET integrates two independent N-channel H-bridges with integrated current-sense regulation using external sense resistors on ISEN12 and ISEN34 pins. Its fixed off-time (t_OFF = 20 μs) PWM current control enables precise peak-current limiting without external timing components.

Control flexibility is achieved through MODE pin configuration (tri-state input) selecting among 4-pin, 2-pin, parallel, or independent bridge modes; TRQ pin dynamically scales output current to 50% for reduced power consumption; and nSLEEP enables ultra-low 1.7-μA sleep current at V_M = 12 V and T_A = 25°C.

Key Specifications

Pinout & Package

DRV8847RTET is packaged in a 16-pin WQFN (RTE) with 3.00 mm × 3.00 mm body and exposed thermal pad - optimized for high-power density and thermal performance in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DRV8847RTET, DRV8837RTET offers no dual-bridge capability or current regulation, while DRV8876PWPR adds SPI complexity and footprint cost - DRV8847RTET uniquely balances integration, diagnostics, and compact WQFN packaging for mid-power appliance motor control.

Availability

DRV8847RTET is available at Aetrix Electronics and suitable for refrigerator damper control, ePOS printer mechanisms, and smart meter circuit breakers requiring stable component supply, long-term lifecycle support, and automotive-grade reliability in industrial temperature ranges.

Supply support for DRV8847RTET 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-volume manufacturing.

The DRV8847 product line targets cost-sensitive, thermally constrained mechatronic applications in home appliances and point-of-sale equipment - delivering integrated protection, flexible control, and compact packaging without sacrificing drive strength.

FAQ

What is the maximum continuous output current per H-bridge for DRV8847RTET?

The DRV8847RTET supports 1-A RMS current per H-bridge at T_A = 25°C with adequate PCB copper and thermal relief. In parallel mode (bridges combined), it delivers 2-A RMS with proper heat sinking. Peak current is internally limited and depends on thermal limits - the datasheet specifies 2-A overcurrent protection trip point and 4-A absolute max for V_M > 16.5 V under strict thermal constraints. Always verify power dissipation using R_θJA = 46.4°C/W for the RTE package.

Does DRV8847RTET support stepper motor control, and if so, how is it configured?

Yes, DRV8847RTET supports bipolar stepper motor control by configuring its two H-bridges as phase A and phase B drivers. The device uses IN1/IN2 for Phase A and IN3/IN4 for Phase B, with MODE pin set to independent bridge mode. Microstepping is enabled via external PWM on the INx pins and current regulation using ISEN12/ISEN34 sense resistors. No external indexer or clock generator is needed - full step, half step, and microstep waveforms are implemented entirely in the host MCU.

How does the TRQ pin affect current regulation in DRV8847RTET?

The TRQ pin on DRV8847RTET selects between two internal current-sense reference voltages: 150 mV (TRQ = 0) for 100% torque and 75 mV (TRQ = 1) for 50% torque. This directly scales the trip point of the fixed off-time current regulator - halving the regulated output current without changing sense resistor value or PWM frequency. It is used to reduce power dissipation during holding or low-speed operation while maintaining position accuracy.

What protection features are integrated into DRV8847RTET, and how are faults reported?

DRV8847RTET integrates undervoltage lockout (2.7 V rising), cycle-by-cycle overcurrent protection (2 A trip), open-load detection on all outputs (using high/low-side voltage thresholds), and thermal shutdown (150°C). All faults are reported collectively on the open-drain nFAULT pin, which pulls low during any active fault condition. An external pullup resistor is required; the pin also serves as a general-purpose input in some configurations but defaults to fault indicator in standard operation.

Can DRV8847RTET operate with 3.3-V logic inputs while powered from an 18-V motor supply?

Yes, DRV8847RTET supports 1.8-V, 3.3-V, and 5-V logic inputs independently of VM voltage. Input thresholds are adaptive: V_IL is 0.6 V for V_M < 7 V and 1.0 V for V_M ≥ 7 V, while V_IH remains 1.6 V minimum across all conditions. This allows direct interfacing with 3.3-V MCUs even when VM = 18 V, eliminating level-shifting circuitry and simplifying system design.