STMicroelectronics L6229PDTR

Overview

L6229PDTR from STMicroelectronics is a fully integrated 3-phase DMOS BLDC motor driver IC with Hall-effect sensor decoding logic, constant t_OFF PWM current control, and non-dissipative overcurrent protection. It operates from 8–52 V supply, delivers 2.8 A peak (1.4 A DC) output current per phase, features 0.73 Ω typical R_DS(ON) at 25 °C, supports up to 100 kHz switching, and integrates fast freewheeling diodes - used in factory automation end-points and small pump motor control.

For engineers reviewing the L6229PDTR datasheet, L6229PDTR pinout, L6229PDTR application, or L6229PDTR equivalent, key selection criteria include its 60°/120° Hall decoding flexibility, brake and tachometer outputs, thermal shutdown, cross-conduction protection, and PowerSO36 package thermal resistance of 2 °C/W (junction-to-case).

Technical Context

The L6229PDTR implements a 3-phase half-bridge power stage using isolated DMOS transistors in BCD technology, with synchronous rectification during slow-decay recirculation. Its Hall decoding logic autonomously distinguishes between 60° and 120° electrical spacing of single-ended Hall sensors without external configuration pins.

Current regulation uses a constant t_OFF PWM controller with blanking time (1 µs) to suppress diode reverse-recovery spikes, and an internal monostable triggered by a sense-resistor voltage comparator referenced to VREF (0.5 V typical). Deadtime is fixed at 1 µs to prevent shoot-through.

Key Specifications

Pinout & Package

Package: PowerSO36 (slug-connected GND, 2 °C/W junction-to-case thermal resistance). Exposed thermal pad internally tied to pins 1, 18, 19, and 36 (GND).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6605FTG and MP6532GQ-Z, the L6229PDTR uniquely combines Hall decoding, tachometer output, and non-dissipative overcurrent protection in a single PowerSO36 package - reducing system component count and firmware complexity for mid-power industrial BLDC applications.

Availability

L6229PDTR is available at Aetrix Electronics and suitable for factory automation end-points, home appliance motor control, and small pump applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6229PDTR 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 broad manufacturing scale and AEC-Q100 qualification capabilities.

The L6229 belongs to ST's intelligent power driver product line, designed specifically for cost-sensitive, high-reliability 3-phase BLDC motor control in industrial and consumer equipment - emphasizing integration, thermal robustness, and sensor-agnostic commutation.

FAQ

What is the purpose of the RCOFF and RCPULSE pins?

RCOFF sets the constant OFF-time (t_OFF) of the PWM current controller via an external RC network; its time constant directly determines motor current ripple and maximum achievable speed. RCPULSE sets the pulse width of the TACHO output monostable, enabling programmable speed feedback resolution - both require precision capacitors (0.47–100 nF) and resistors (20–100 kΩ) per datasheet guidelines.

How does the L6229PDTR handle thermal protection?

The device triggers thermal shutdown at 165 °C junction temperature, pulling DIAG low and disabling all power MOSFETs. Recovery requires junction cooling below hysteresis threshold (~150 °C); no automatic restart occurs - system-level logic must cycle EN or power to resume operation, preventing thermal runaway in sustained overload.

Can the L6229PDTR drive motors with 240° or 300° Hall sensor spacing?

Yes - the decoding logic interprets 240° and 300° phasing as reversed sequences of 120° and 60° configurations respectively; direction reversal via FWD/REV pin achieves correct commutation without hardware or firmware changes, making it compatible with all four standard BLDC Hall layouts.

What is the role of the SENSEA and SENSEB pins in current sensing?

SENSEA and SENSEB are the source-node connections for the external current-sense resistor shared across all three half-bridges; they tie together and connect to ground through a single shunt. The internal sense comparator monitors voltage drop across this resistor against VREF to trigger PWM off-time - enabling unified, low-side current regulation without per-phase sensing components.