STMicroelectronics L6225PDTR

Overview

L6225PDTR from STMicroelectronics is a DMOS dual full-bridge motor driver IC designed for bipolar stepper and dual/quad DC motor control, featuring 8–52 V operating supply voltage, 2.8 A peak output current (1.4 A DC), 0.73 Ω typical R_DS(ON) per switch at T_j = 25 °C, up to 100 kHz switching frequency, and integrated non-dissipative overcurrent protection. It operates in PowerSO-20 package with exposed thermal slug.

For engineers reviewing the L6225PDTR datasheet, L6225PDTR pinout, L6225PDTR application, or L6225PDTR equivalent, key selection criteria include bridge enable logic behavior, bootstrap charge pump operation (V_CP = 600 kHz typ.), cross-conduction dead time (0.5–1 µs), thermal shutdown at 165 °C, and ENA/ENB pin dual-role functionality (enable + OCD fault reporting).

Technical Context

The L6225PDTR integrates two independent full H-bridges using MultiPower-BCD technology, combining isolated DMOS power transistors with CMOS/bipolar logic on a single die. Each bridge supports TTL/CMOS-compatible inputs (IN1A/IN2A/IN1B/IN2B) and separate enable pins (ENA/ENB) that also serve as open-drain fault outputs for overcurrent and thermal events.

Its charge pump (V_CP output, 600 kHz typ., 10 V amplitude) generates V_BOOT to drive high-side N-channel MOSFETs; cross-conduction is prevented by built-in 0.5–1 µs dead time. Overcurrent detection uses internal current-sensing cells (not external shunts), triggering ENx pull-down when load current exceeds 2.8 A (typ.) per bridge.

Key Specifications

Pinout & Package

Package: PowerSO-20 (exposed thermal slug, internally connected to pins 1, 10, 11, 20 - all GND). Thermal resistance: R_th-j-case = 2 °C/W; R_th-j-amb = 36 °C/W with 6 cm² top-side copper + ground layer + 16 vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6612FNG and VNQ5E050AKTR-E, the L6225PDTR uniquely delivers dual full-bridge operation at 8–52 V with non-dissipative OCD, making it irreplaceable for industrial bipolar stepper and dual-motor systems requiring robust fault handling and wide supply range.

Availability

L6225PDTR is available at Aetrix Electronics and suitable for bipolar stepper motor control, dual DC motor drive, quad actuator interface, and industrial actuator driver applications requiring stable component supply across extended temperature and voltage ranges.

Supply support for L6225PDTR 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 products for industrial, automotive, and consumer markets.

The L6225PDTR belongs to ST's Power Switches & Motor Drivers product line, engineered specifically for ruggedized, high-efficiency motor control in industrial automation, robotics, and precision motion systems.

FAQ

What is the recommended external charge pump configuration for L6225PDTR?

Use C_BOOT = 220 nF, C_P = 10 nF, R_P = 100 Ω, and two 1N4148 diodes. The internal V_CP oscillator (600 kHz typ., 10 V) drives this network to generate V_BOOT ≥ V_S + 10 V. Mount components within 5 mm of the IC with short traces to minimize ringing and ensure reliable high-side gate drive across the full 8–52 V supply range.

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

The L6225PDTR embeds precision current-mirror cells in each high-side DMOS source path. These deliver a scaled replica (1/n) of the output current to internal comparators referenced against 2.8 A threshold. When exceeded, ENA/ENB are actively pulled low (≤1.3 V) via 4 mA open-drain MOSFETs - eliminating external shunt resistors and their associated power loss and layout sensitivity.

Can L6225PDTR drive a single 4-phase unipolar stepper motor?

No - the L6225PDTR is optimized for bipolar stepper motors (2-phase, 4-wire) or dual DC motors. Unipolar steppers require center-tapped windings and separate low-side switching per phase, which this dual full-bridge topology does not support. For unipolar applications, discrete low-side drivers (e.g., ULN2003) or dedicated unipolar controllers are required.

What PCB layout practices are critical for thermal performance in PowerSO-20 package?

Solder the exposed thermal slug (pins 1, 10, 11, 20) to ≥6 cm² of 35 µm-thick copper on the top layer, connected via ≥16 thermal vias (0.3 mm diameter) to an internal ground plane. Keep SENSEA/SENSEB traces short and direct to power ground; separate power and signal ground planes with single-point connection near GND pins to avoid noise coupling into OCD sensing paths.