STMicroelectronics L6229D

Overview

L6229D from STMicroelectronics is a fully integrated 3-phase DMOS BLDC motor driver IC with non-dissipative overcurrent protection, constant t_OFF PWM current control, and 60°/120° Hall sensor decoding logic. It delivers 2.8 A peak (1.4 A DC) output current, operates from 8–52 V supply, features R_DS(ON) = 0.73 Ω (typ. at 25 °C), and supports up to 100 kHz switching frequency. It is used in factory automation end-points and small pumps requiring precise commutation and diagnostic feedback.

For engineers reviewing the L6229D datasheet, L6229D pinout, L6229D application, or L6229D equivalent, key selection considerations include its integrated slow-decay synchronous rectification, tachometer output for closed-loop speed control, brake function, cross-conduction protection, and thermal shutdown behavior under continuous 1.4 A load conditions.

Technical Context

The L6229D implements a constant off-time (t_OFF) PWM current controller using an external RC network on RCOFF to set recirculation time (6.6 μs to 6 ms range), with internal 1 μs deadtime to prevent shoot-through. Its Hall decoding logic autonomously distinguishes 60° and 120° electrical spacing without configuration pins, enabling universal BLDC motor compatibility.

It integrates a charge pump (600 kHz typical, 10 V amplitude at VCP) to drive high-side N-MOSFETs, uses internal fast freewheeling diodes, and provides diagnostic feedback via open-drain DIAG (overcurrent/thermal) and TACHO (pulse-width modulated speed signal) outputs - all within a single SO-24 package with exposed GND slug for thermal dissipation.

Key Specifications

Pinout & Package

Package: SO-24 (20 + 2 + 2), thermally enhanced with exposed GND slug (pins 1, 18, 19, and internally connected slug). Pin count includes 3 Hall inputs, 3 power outputs, dual supply rails (VSA/VSB), dual sense inputs (SENSEA/SENSEB), and dedicated diagnostic/tachometer/brake/control pins.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-phase BLDC motor driver applications.

Compared with DRV8301PWP and STSPIN32F0A, the L6229D offers standalone Hall-based commutation with diagnostic outputs (DIAG, TACHO) and minimal external components - making it optimal for fixed-function, high-reliability BLDC drives where MCU resources are constrained or unavailable.

Availability

L6229D is available at Aetrix Electronics and suitable for factory automation end-points, home appliance fans, and small industrial pumps requiring stable component supply, long-lifecycle support, and consistent SO-24 packaging across production batches.

Supply support for L6229D 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in power management, motor control, and automotive-grade ICs with vertical manufacturing and AEC-Q100 qualified processes.

The L6229D belongs to ST's high-voltage motor driver product line, designed specifically for cost-effective, robust 3-phase BLDC control in industrial and consumer equipment where integration, reliability, and thermal performance are critical.

FAQ

What is the recommended external sense resistor value for 1.4 A DC operation?

For 1.4 A DC output with VREF = 0.5 V, use a 0.1 Ω, 1% tolerance, 1 W shunt resistor between SENSEA/SENSEB and GND. This yields 140 mV drop at full load, matching the typical 0.5 V reference with ±5 mV comparator offset. Ensure Kelvin connection to minimize PCB trace resistance error.

How does the L6229D implement non-dissipative overcurrent detection?

It monitors voltage across internal high-side MOSFETs using dedicated sense FETs - not external shunts - detecting overcurrent by comparing drain-source voltage to a threshold. This avoids power loss in external resistors and enables sub-μs response (200 ns turn-on delay) without affecting efficiency.

Can the L6229D drive motors with Hall sensors spaced at 240° or 300° electrical angles?

Yes - the decoder interprets 240° and 300° sequences as reversed versions of 120° and 60° layouts respectively. By asserting the FWD/REV pin appropriately, the same hardware supports all four standard Hall spacings without modification to pin connections or firmware.

What thermal derating applies when using the SO-24 package without copper pour?

In free-air (no PCB copper), R_th(j-amb) rises to 78 °C/W. At 1.4 A DC and 48 V, power dissipation is ~2.9 W; junction temperature rise exceeds 225 °C - exceeding 165 °C shutdown. A minimum 6 cm² bottom-side copper pour with thermal vias is mandatory for continuous operation.