STMicroelectronics L6234PD

Overview

L6234PD from STMicroelectronics is a triple half-bridge motor driver IC designed for brushless DC (BLDC) motor control in industrial and automotive applications. It operates from 7 V to 52 V supply, delivers 5 A peak output current per channel, features 0.3 Ω typical R_DS(on) at 25 °C, includes intrinsic fast freewheeling diodes, and supports up to 150 kHz commutation frequency.

For engineers reviewing the L6234PD datasheet, L6234PD pinout, L6234PD application, or L6234PD equivalent, key selection considerations include independent enable/control per half-bridge, dual current-sense inputs (SENSE1/SENSE2), bootstrap gate drive architecture (VBOOT/VCP), thermal shutdown at 150 °C, and PowerSO20 package thermal resistance of 1.5 °C/W junction-to-case.

Technical Context

The L6234PD integrates three independent half-bridge power stages using BCD-multipower technology, combining isolated DMOS transistors with CMOS/bipolar logic on a single die. Each bridge is controlled by separate TTL/CMOS-compatible INx and ENx inputs, enabling precise phase sequencing and PWM-based current regulation.

It implements cross-conduction protection with 300 ns dead time, uses external sense resistors for current feedback (SENSE1 for bridges 1&2, SENSE2 for bridge 3), and provides an internal 10 V reference (VREF) with capacitor stabilization. The bootstrap oscillator (VCP) and overvoltage gate drive input (VBOOT) support high-side NMOS switching without external charge pumps.

Key Specifications

Pinout & Package

The L6234PD is housed in a thermally enhanced PowerSO20 package with exposed die pad for PCB heat transfer. All 20 pins are defined per ST's official pin function table (DocID1107 Rev 11, p.4).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6603FTG and MP6532, the L6234PD offers superior thermal performance (1.5 °C/W), higher peak current (5 A), and dedicated dual sense inputs-making it optimal for industrial and automotive designs demanding reliability, field-serviceability, and flexible current sensing topologies.

Availability

L6234PD is available at Aetrix Electronics and suitable for industrial motor control, automotive HVAC systems, and medical device actuation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for L6234PD 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, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.

The L6234PD belongs to ST's Power Switches & Motor Drivers product line, engineered specifically for robust, high-efficiency three-phase BLDC motor control in harsh environments with wide supply ranges and stringent thermal constraints.

FAQ

What is the maximum continuous output current per channel for L6234PD?

The L6234PD supports 4 A DC output current at T_A = 25 °C per channel under recommended operating conditions (Table 5). Continuous current is thermally limited: at 70 °C ambient, total power dissipation must stay ≤2.3 W, yielding ~3.2 A RMS per channel with proper PCB heatsinking and the PowerSO20 package's 1.5 °C/W R_th(j–c).

Does L6234PD require external bootstrap capacitors and diodes?

Yes. The L6234PD requires an external bootstrap capacitor and diode connected between VCP and VBOOT pins to generate the floating voltage needed for high-side gate drive. ST recommends a 100 nF ceramic capacitor and fast-recovery diode (e.g., 1N4148) per channel; values are validated in application note AN2480 for PowerSO20 layout.

Can L6234PD be used for sensorless BLDC commutation?

Yes. The L6234PD supports sensorless operation when paired with an MCU that monitors back-EMF via the OUT pins and implements zero-crossing detection. Its TTL-compatible inputs, independent EN/IN control, and fast 150 kHz switching enable precise timing for six-step or trapezoidal commutation without Hall sensors.

Is L6234PD RoHS-compliant and halogen-free?

Yes. The L6234PD is manufactured in ST's ECOPACK®2-compliant PowerSO20 package, meeting RoHS Directive 2011/65/EU and JEDEC JS709C halogen-free requirements. Full compliance documentation-including material declarations and test reports-is available via ST's Quality & Reliability portal using order code L6234PD.