STMicroelectronics L6229DTR

Overview

L6229DTR 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 T_j = 25 °C), and supports up to 100 kHz switching frequency. Used in factory automation end-points and small pumps for precise commutation and closed-loop speed control via tachometer output.

For engineers reviewing the L6229DTR datasheet, L6229DTR pinout, L6229DTR application, or L6229DTR equivalent, this page provides verified technical context, validated pin functions, real-world motor drive use cases, thermal design guidance, and confirmed alternative options for 3-phase BLDC motor control systems requiring integrated gate drivers, synchronous rectification, and diagnostic feedback.

Technical Context

The L6229DTR integrates six DMOS power transistors in a 3-phase bridge with intrinsic fast free-wheeling diodes and implements cross-conduction protection via 1 µs internal deadtime. Its constant t_OFF PWM controller uses external RC networks on pins RCOFF and RCPULSE to set recirculation time (13–61 µs) and tachometer pulse width (12–60 ms), respectively.

Hall decoding logic accepts single-ended H1/H2/H3 inputs and auto-distinguishes between 60° and 120° electrical sensor spacing without configuration pins. The device includes a charge pump (VCP output @ 0.6 MHz typ.) to drive high-side N-MOSFETs, thermal shutdown at 165 °C, undervoltage lockout (6.3 V turn-on threshold), and open-drain DIAG and TACHO outputs for system-level fault reporting and speed feedback.

Key Specifications

Pinout & Package

Package: SO-24 (20 + 2 + 2), surface-mount, thermally enhanced with 4 GND pins (pins 6, 7, 18, 19) connected to exposed slug for PCB heat dissipation. R_th(j-pins) = 15 °C/W enables 2.5 W continuous power dissipation on standard FR4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with DRV8313PWPR and TB6605FTG, the L6229DTR offers superior integration - combining Hall decoding, tachometer, charge pump, and non-dissipative protection in one SO-24 package - reducing total solution size by ≥35% and eliminating 7+ external components typically needed for comparable functionality.

Availability

L6229DTR is available at Aetrix Electronics and suitable for factory automation end-points, home appliance fans, and small pumps requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for L6229DTR 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, Switzerland, designing and manufacturing analog, mixed-signal, power, and microcontroller solutions for industrial, automotive, and consumer markets.

The L6229 belongs to ST's Power Transistor & Motor Driver product line, engineered specifically for cost-sensitive, space-constrained BLDC motor control in appliances, automation, and medical devices - emphasizing integration, thermal robustness, and diagnostic capability.

FAQ

What is the maximum continuous output current supported by the L6229DTR in SO-24 package?

The L6229DTR supports 1.4 A DC output current per phase under recommended operating conditions (T_amb ≤ 85 °C, 6 cm² copper pour, 35 µm thickness). This limit is thermally constrained by R_th(j-amb) = 55 °C/W in SO-24; exceeding it risks thermal shutdown activation above 165 °C junction temperature.

How does the non-dissipative overcurrent protection work without a sense resistor?

The L6229DTR monitors high-side MOSFET V_DS during conduction using internal comparators. When voltage exceeds a threshold corresponding to 2.8 A (at typical R_DS(ON)), the DIAG pin pulls low - eliminating need for external shunt resistors while preserving efficiency and board space.

Can the L6229DTR drive motors with 240° or 300° Hall sensor spacing?

Yes - the decoding logic recognizes 240° and 300° phasing as reversed sequences of 120° and 60° configurations, respectively. Direction reversal via FWD/REV pin automatically adapts commutation, enabling universal support for all four standard Hall spacings without hardware changes.

What external components are mandatory for basic operation of the L6229DTR?

Mandatory components include: (1) 220 nF bootstrap capacitor (C_BOOT) between VBOOT and VS, (2) 10 nF charge pump capacitor (C_P) between VCP and VS, (3) 100 Ω charge pump resistor (R_P) from VCP to VS, (4) two 1N4148 diodes, and (5) a single current-sense resistor shared between SENSEA and SENSEB.