STMicroelectronics L9953LXPTR

Overview

L9953LXPTR from STMicroelectronics is an automotive-grade multifunctional door actuator driver IC integrating five half-bridge outputs (OUT1–OUT5), three high-side drivers (OUT6–OUT8), SPI interface, current monitoring, and programmable soft-start. It delivers 0.75A per half-bridge (R_DS(on) = 1600 mΩ), up to 6A on OUT8 (R_DS(on) = 100 mΩ), and supports PWM-controlled bidirectional motor driving for door lock, mirror fold/vertical/horizontal control, and defroster/LED lighting. Designed for 12V automotive systems, it operates from −40°C to +150°C junction temperature.

For engineers reviewing the L9953LXPTR datasheet, L9953LXPTR pinout, L9953LXPTR application, or L9953LXPTR equivalent, key selection considerations include its eight-channel configurable output topology (half-bridge vs. high-side), integrated diagnostics (open-load, overload, overtemperature), low standby current (<6 µA), and SPI-configurable soft-start for inrush-current-sensitive loads like incandescent bulbs and DC motors.

Technical Context

The L9953LXPTR implements a microcontroller-driven architecture with a standard 24-bit SPI interface for command input (forward/reverse/brake/hi-Z) and diagnostic status readback. All eight outputs feature independent protection: short-circuit, open-load, overload, and thermal shutdown (T_j = 170°C turn-off, 150°C hysteresis).

It supports dual supply operation (VS = 7–28 V for power stage, VCC = 4.5–5.3 V for logic), includes a charge pump (CP) output for external reverse-polarity MOSFET gate drive, and provides current monitor outputs (CM) for OUT1, OUT4, OUT5, and OUT8 with 1:10,000 scaling and ±4% accuracy at full scale. PWM1 and CM/PWM2 enable external PWM control of multiple outputs.

Key Specifications

Pinout & Package

Package: PowerSSO-36 (exposed thermal pad, RoHS-compliant, ECOPACK®). Dimensions: 10.0 mm × 7.5 mm × 1.75 mm (max height), thermal resistance R_θJA = 30°C/W (JEDEC Std 51-7, 4-layer board).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar door actuator driver applications.

Compared with L9953LXPTR, L9953TR offers identical performance in tape-and-reel form factor, while BD37101FV lacks half-bridge capability, SPI configurability, and diagnostic richness-making it unsuitable for integrated door actuator systems requiring motor control and fault reporting.

Availability

L9953LXPTR is available at Aetrix Electronics and suitable for automotive body electronics, door module assemblies, and mirror control systems requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for L9953LXPTR 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, MCU, power, and automotive ICs with vertical fabrication capacity and AEC-Q100 process validation.

The L9953LXPTR belongs to ST's Automotive Power Switches & Drivers product line, engineered specifically for intelligent, diagnostic-rich control of electromechanical actuators in vehicle body and convenience systems.

FAQ

What is the purpose of the CP (charge pump) pin?

The CP pin provides a boosted voltage (VS+6 V to VS+13 V) to drive the gate of an external N-channel MOSFET used for reverse-polarity battery protection. This eliminates the power loss and heat generation of a series Schottky diode while maintaining robust protection against battery misconnection in automotive environments.

How does open-load detection work on high-side outputs like OUT8?

Open-load detection applies a controlled test current through the high-side driver and measures resulting voltage at the output pin. If the pin remains near VS (no load), or near GND (shorted), the internal diagnostic logic flags an open or short condition. This occurs during active mode and is reported via SPI status register bit 12–15.

Can PWM1 control all outputs simultaneously?

PWM1 directly controls OUT1–OUT6 and OUT8 in hardware; OUT7 is controlled exclusively via SPI or the bidirectional CM/PWM2 pin. The PWM1 signal overrides SPI commands for its assigned outputs, enabling real-time analog dimming or motor speed control without CPU intervention or SPI latency.

What is the minimum pulse width required for reliable SPI communication?

The minimum CSN low time is 100 ns, and the minimum CLK period is 100 ns (10 MHz max SPI clock), per Table 17 and Figure 3. Data setup/hold times are 20 ns (DI) and 30 ns (DO), ensuring reliable 24-bit frame transfer even under worst-case temperature and voltage conditions across the −40°C to +150°C range.