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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Management - Specialized

STMicroelectronics L9954XP

Name: L9954XP
Brand: STMicroelectronics
SKU: L9954XP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9954XP

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: PowerSSO-36 Exposed Bottom Pad

Datasheet:: L9954XP.pdf

Description:: IC DVR DOOR ACTUATOR POWERSSO-36

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Product details

Overview

L9954XP from STMicroelectronics is an automotive-grade door actuator driver IC integrating three half-bridge outputs (±1.5 A, R_ON = 800 mΩ), one 6 A high-side driver (R_ON = 100 mΩ), and two additional 1.5 A high-side drivers (R_ON = 800 mΩ), all SPI-controlled for mirror axis control, defroster, and 10 W lighting in vehicle door modules.

For engineers reviewing the L9954XP datasheet, L9954XP pinout, L9954XP application, or L9954XP equivalent, this device supports PWM-controlled bidirectional motor drive, open-load/overload diagnostics per channel, current monitoring on OUT1/OUT4/OUT5/OUT6, and programmable softstart for inrush-current-sensitive loads - critical for automotive body electronics validation.

Technical Context

The L9954XP implements a microcontroller-driven architecture with a standard 24-bit SPI interface for command input and diagnostic readback, supporting forward/reverse/brake/high-impedance states across all six outputs. It features dual power domains (VS up to 28 V for power stage, VCC = 4.5–5.3 V for logic) and integrated charge pump output (VCP = VS + 6 to VS + 13 V) for external reverse-polarity MOSFET gate drive.

Each output includes independent protection: short-circuit detection, overtemperature shutdown (T_j = 170 °C), open-load detection (I_OLD = 15–60 mA), and cross-current protection with 200–400 µs dead-time enforcement. Standby current is <6 µA at T_j ≤ 85 °C, enabling low-power vehicle-off operation.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Configuration	Three half-bridges (OUT1–OUT3) + three high-side drivers (OUT4–OUT6); enables dual DC motors + three resistive loads
Max Output Current	±1.5 A (half-bridges), −6 A (OUT6), −1.5 A (OUT4/OUT5); supports mirror positioning and 10 W bulb driving
R_ON (Typ)	800 mΩ (half-bridges & OUT4/OUT5), 100 mΩ (OUT6); limits conduction loss and thermal rise under load
Diagnostic Coverage	Per-output open-load, overload, short-circuit, and overtemperature detection; all reported via SPI status register
Current Monitor	1/10,000 scaling on OUT1/OUT4/OUT5/OUT6; enables real-time load current feedback without external shunt
Standby Current	<6 µA at T_j ≤ 85 °C; meets automotive "always-on" module leakage requirements during vehicle sleep
Supply Range	VS = 7–28 V (power rail), VCC = 4.5–5.3 V (logic rail); accommodates battery transients and cold-crank conditions

Pinout & Package

Package: PowerSSO-36 - thermally enhanced exposed-pad SO package with 36 leads, optimized for automotive under-hood thermal dissipation and board-level EMI control.

Pin/Terminal	Circuit Role	Design Meaning
GND (Pins 1,18,19,36)	Power ground reference	All four pins must be externally connected to minimize voltage drop and ensure full output current capability
VS (Pins 6,7,14,25,28,32)	Main power supply input	Six dedicated VS pins required for low-impedance path to support peak 10 A OUT6 current and reduce thermal stress
OUT1–OUT3 (Pins 3–5)	Half-bridge motor outputs	Internally connected HS+LS DMOS stages; each provides bidirectional drive with bulk-drain freewheeling diodes
OUT4/OUT5 (Pins 31,20)	High-side resistive load drivers	Source-only outputs (no GND-referenced diode); intended for bulbs/defrosters with external flyback path
OUT6 (Pins 2,35)	High-current high-side driver	Dual-pin output rated −6 A continuous; internal 100 mΩ R_ON minimizes heating in defroster applications
CSN/CLK/DI/DO (Pins 10,13,8,11)	SPI interface signals	CMOS-level 24-bit serial interface with tristate DO; enables daisy-chaining and fault reporting without GPIO overhead
CP (Pin 29)	Charge pump output	Drives gate of external N-MOS for reverse polarity protection; VCP = VS + 6 to VS + 13 V ensures full enhancement
PWM1 (Pin 32)	Hardware PWM input	Bypasses SPI for real-time control of OUT1–OUT4 and OUT6; supports fast-response mirror positioning

Key Features

Feature	Design Value
Programmable softstart	Configurable delay prevents inrush-triggered overcurrent faults when driving capacitive or cold-filament loads
Per-channel current monitor	Integrated 1/10,000 current-sense ratio on four outputs eliminates need for external amplifiers or shunts
Open-load diagnostic	Detects disconnected motor windings or broken bulb filaments using 15–60 mA test current per output
Thermal warning & shutdown	130 °C junction warning flag and 170 °C hard shutdown with 20 °C hysteresis prevent latch-up during sustained overload
Reverse polarity protection support	On-chip charge pump (VCP) drives external N-MOS gate, enabling robust ±25 V reverse-battery immunity

Applications

Mirror Positioning System

Door Lock / Folder Actuation

Use Scenario: Precise vertical/horizontal adjustment of electric side mirrors using dual DC motors.

IC Role / Device Role / Timing Role: Half-bridges OUT1–OUT3 provide bidirectional PWM-controlled H-bridge drive with brake and coast modes; SPI enables synchronized multi-axis motion profiles.

Use Value: Integrated cross-current protection (200–400 µs dead time) prevents shoot-through during direction reversal, ensuring motor reliability over 100,000 cycles.

Use Scenario: Driving solenoid-based door lock actuators and folder latches in premium vehicle doors.

IC Role / Device Role / Timing Role: High-side drivers OUT4 and OUT5 deliver controlled 1.5 A pulses to solenoids; programmable softstart avoids mechanical jerk and coil saturation.

Use Value: Open-load detection confirms solenoid coil integrity before engagement, eliminating false-lock events in safety-critical access systems.

Mirror Defroster Control

Door Courtesy Lighting

Use Scenario: Powering 6–10 W resistive heating elements embedded in mirror glass to clear condensation/frost.

IC Role / Device Role / Timing Role: OUT6 delivers −6 A continuous current with 100 mΩ R_ON; current monitor provides real-time thermal derating feedback.

Use Value: Overtemperature shutdown at 170 °C prevents glass cracking or adhesive failure during extended defrost cycles.

Use Scenario: Switching multiple 10 W incandescent or LED bulbs for interior door lighting and puddle lamps.

IC Role / Device Role / Timing Role: OUT4/OUT5 high-side drivers replace discrete FETs; PWM1 input enables dimming without MCU SPI overhead.

Use Value: 6 µA standby current allows always-connected lighting control without draining vehicle battery during parking mode.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
L9954TR	Same die in PowerSO-36 package; higher θ_JA (45 °C/W vs. 38 °C/W for PowerSSO-36), no exposed thermal pad	Limited to lower ambient temperatures or reduced duty cycle in sealed door modules	Select when legacy PCB layout or cost sensitivity outweighs thermal performance needs
TLE9201SG	Single half-bridge (2.8 A), no integrated current monitor or softstart; SPI interface only for diagnostics	Requires external components for multi-motor control and current sensing; not pin-compatible	Choose for simpler single-axis applications where system-level integration replaces L9954XP's consolidation

Compared with L9954TR, the L9954XP offers superior thermal management for sustained 6 A defroster loads; versus TLE9201SG, it delivers full system integration-reducing BOM count by 7+ discrete components while enabling closed-loop current control and predictive diagnostics.

Availability

L9954XP is available at Aetrix Electronics and suitable for automotive door module design, mirror actuation systems, and body control unit (BCU) development requiring stable component supply, AEC-Q100 Grade 1 qualification, and long-term production continuity.

Supply support for L9954XP 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 specializing in automotive, industrial, and power management ICs, with broad portfolio coverage from microcontrollers to intelligent power devices.

The L9954XP belongs to ST's automotive door actuator driver product line, engineered specifically for consolidated control of mirrors, locks, defrosters, and lighting in modern vehicle door modules - reducing wiring harness complexity and ECU footprint.

FAQ

What is the maximum continuous current rating for OUT6?

OUT6 is rated for −6 A continuous source current at T_j = 25 °C and VS = 13.5 V, with R_ON = 100 mΩ (typ). At 125 °C junction temperature, R_ON increases to 150–200 mΩ, limiting practical continuous current to ~4.5 A under thermal constraints. Absolute maximum pulsed current is −10.5 A per datasheet Table 11.

How does the open-load diagnostic function work on OUT1–OUT3?

The L9954XP applies a 15–60 mA test current through each half-bridge output and measures resulting voltage. If the load is disconnected (open), the output voltage rises above threshold, triggering a diagnostic flag in the SPI status register. This occurs independently for high-side and low-side paths, supporting winding continuity checks in dual-coil mirror motors.

Can PWM1 control all six outputs simultaneously?

No. PWM1 input controls only OUT1–OUT4 and OUT6 per datasheet Section 3.11; OUT5 is controlled exclusively via SPI or through CM/PWM2 multiplexing. OUT2 and OUT3 require complementary PWM signals for H-bridge operation and cannot be driven unidirectionally by PWM1 alone - their direction and state depend on SPI-configured mode bits.

Is external reverse polarity protection required when using the CP pin?

Yes. The CP pin drives the gate of an external N-channel MOSFET placed between battery and VS pin. The L9954XP does not include internal reverse-battery protection; the external MOSFET and associated gate resistor/capacitor network must be implemented per Figure 1 and Section 3.6 to achieve ±25 V reverse-voltage tolerance.

L9954XP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: PowerSSO-36 Exposed Bottom Pad

Packaging:: Tube

Product Status:: Active

Applications:: -

Current - Supply:: 7mA

Voltage - Supply:: 7V ~ 28V

Operating Temperature:: -40°C ~ 150°C

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSSO-36

L9954XP FAQ

1.How can I place an order for L9954XP through Aetrix?

Please submit a Request for Quotation (RFQ) for L9954XP on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for L9954XP reliable?

The price and inventory of L9954XP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9954XP is usually 5 days.

3.What payment methods are accepted for L9954XP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9954XP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9954XP?

L9954XP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9954XP order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for L9954XP?

For technical support, including L9954XP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9954XP requirements.

6.How does Aetrix verify that L9954XP is sourced from the original manufacturer or authorized distributors?

All L9954XP products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L9954XP meets industry standards.

7.What is the process for return or replacement of L9954XP?

All L9954XP units undergo pre-shipment inspection (PSI). If there is an issue with L9954XP, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The L9954XP part is unused and in its original packaging.

Return procedure for L9954XP:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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