STMicroelectronics L9950XPTR

Overview

L9950XPTR from STMicroelectronics is an automotive-grade multifunctional door actuator driver IC integrating six half-bridge outputs and five high-side drivers for controlling up to five DC motors and five resistive loads. It delivers 6 A full-bridge drive (R_ON = 150 mΩ), dual 3 A half-bridges (R_ON = 300 mΩ), two 1.5 A half-bridges (R_ON = 800 mΩ), one 6 A high-side driver (R_ON = 100 mΩ), and four 1.5 A high-side drivers (R_ON = 800 mΩ), with SPI-controlled PWM, open-load/overload diagnostics, and programmable soft-start - deployed in vehicle door lock, mirror fold, and defroster systems.

For engineers reviewing the L9950XPTR datasheet, L9950XPTR pinout, L9950XPTR application, or L9950XPTR equivalent, this page provides verified functional architecture, real-world diagnostic behavior, thermal shutdown thresholds (T_{jSD ON} = 170 °C), current monitor accuracy (±4% + 1%FS), and PowerSSO-36 package-specific layout guidance - all validated against ST's Doc ID 10311 Rev 11.

Technical Context

The L9950XPTR implements a microcontroller-driven SPI interface (24-bit control word, LSB-first) with dedicated status register reporting fault conditions including overtemperature, open-load, overload, and supply UV/OV events. All 11 outputs feature independent short-circuit protection, overtemperature shutdown (T_{jSD OFF} = 150 °C), and diagnostic feedback via DO pin or SPI status bits.

It supports dual power domains: VS (7–28 V) powers output stages and CP charge pump, while VCC (4.5–5.3 V) supplies logic; standby current is ultra-low (I_S < 6 µA typ, I_CC < 25 µA typ at T_j ≤ 85 °C). The integrated charge pump (V_CP = 6–13 V) drives external n-MOSFETs for reverse polarity protection.

Key Specifications

Pinout & Package

Supplied in PowerSSO-36 package: thermally enhanced exposed-pad SOIC variant with 36 leads, optimized for automotive under-hood thermal dissipation and EMC robustness. Pin count and function mapping match ST's official mechanical drawing (Doc ID 10311, Fig. 2).

Key Features

Applications

Equivalent & Alternatives

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

Compared with BD1600FV-M and VNQ7E100AJTR, the L9950XPTR uniquely integrates mixed-output topology (6 HB + 5 HS), full SPI diagnostics, and programmable soft-start - enabling single-chip replacement of 3+ discrete drivers in ASIL-B-compliant door modules.

Availability

L9950XPTR is available at Aetrix Electronics and suitable for automotive door module design, mirror actuation systems, and exterior lighting control requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 Grade 1 qualification.

Supply support for L9950XPTR 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, specializing in automotive, industrial, and power management ICs with broad AEC-Q100-qualified portfolios.

The L9950XPTR belongs to ST's Automotive Smart Power family, engineered specifically for body electronics actuation - emphasizing integration density, diagnostic completeness, and thermal resilience in space-constrained automotive ECUs.

FAQ

What is the maximum operating junction temperature and thermal shutdown behavior?

The L9950XPTR triggers thermal warning at T_j = 150 °C and enters hard shutdown at T_j = 170 °C, with 5 K hysteresis for both thresholds. Shutdown disables all outputs and sets status bit 0 in the SPI status register. Recovery requires T_j falling below 150 °C and a valid SPI reset command - confirmed in Table 6 and Section 2.4 of Doc ID 10311 Rev 11.

How does the current monitor function work, and which outputs support it?

The current monitor (CM/PWM2 pin) provides a 1/10,000 scaled replica of instantaneous output current for OUT1, OUT4, OUT5, OUT6, and OUT11 - verified in Table 9. Accuracy is ±4% + 1%FS at 500 mA–5.9 A. It is not available for OUT2, OUT3, OUT7–OUT10 due to internal routing constraints, as stated in the "Current monitor output" section.

Can the L9950XPTR drive inductive loads without external freewheeling components?

Yes - half-bridge outputs (OUT1–OUT6) include internal bulk-drain diodes enabling safe freewheeling for inductive loads like DC motors. However, high-side-only outputs (OUT7–OUT11) lack internal GND-reverse diodes and require external flyback paths (e.g., Schottky diode from output to GND) - explicitly noted in Table 2 pin descriptions and Section 3.3.

What is the purpose of the CP (charge pump) pin, and what external component is required?

The CP pin delivers 6–13 V (depending on VS) to drive the gate of an external n-channel MOSFET used for reverse polarity protection - described in Table 10 and Figure 1 block diagram. A minimum 100 nF ceramic capacitor must be placed between CP and GND per Section 3.1 and Figure 1 note. No external inductor or charge pump IC is needed.