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

STMicroelectronics L9954

Name: L9954
Brand: STMicroelectronics
SKU: L9954
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9954

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: PowerSO-36 Exposed Bottom Pad

Datasheet:: L9954.pdf

Description:: IC DVR DOOR ACTUATOR POWERSO-36

Quantity:: RFQ Add To RFQ list

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Inventory:1,194

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Product details

Overview

L9954 from STMicroelectronics is an automotive-grade, SPI-controlled 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), designed for mirror axis control, defroster heating, and 10 W bulb driving in vehicle door modules.

For engineers reviewing the L9954 datasheet, L9954 pinout, L9954 application, or L9954 equivalent, this device supports PWM-controlled bidirectional motor drive, real-time current monitoring (OUT1/4/5/6), open-load and overload diagnostics, programmable softstart, and reverse-polarity protection via external MOSFET driven by its charge pump output.

Technical Context

The L9954 implements a microcontroller-driven architecture with a 24-bit SPI interface for command input and status readback, enabling precise control of six independent outputs (three half-bridges + three high-side drivers) with configurable fault reporting. All outputs feature integrated overtemperature, short-circuit, and open-load protection.

Its dual-supply design separates VS (7–28 V battery rail) from VCC (4.5–5.3 V logic supply), and includes dedicated diagnostic functions: current monitor scaling (1:10,000), programmable softstart for inrush current management (>6 A), and cross-current protection with 200–400 µs dead-time enforcement between high- and low-side switching.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Configuration	Three half-bridges (OUT1–OUT3) + three high-side drivers (OUT4–OUT6)
Max Output Current	±3 A sink/source per half-bridge; −6 A source for OUT6; −3 A source for OUT4/OUT5
R_ON (Typ)	800 mΩ (half-bridges & OUT4/OUT5); 100 mΩ (OUT6)
Standby Current	<6 µA at T_j ≤ 85 °C - enables ultra-low-power vehicle sleep-mode compliance
Diagnostic Coverage	Open-load detection (15–60 mA threshold), overload detection, overtemperature warning (130 °C) and shutdown (170 °C)
SPI Interface	24-bit serial command/status register with CSN/CLK/DI/DO; supports real-time fault reporting and configuration
Charge Pump Output	V_CP = V_S + 6 to V_S + 13 V - drives external N-MOSFET for reverse-polarity protection

Pinout & Package

Package: PowerSO-36 (exposed thermal pad, RoHS-compliant, ECOPACK®). Designed for high-power automotive PCB mounting with multiple GND and VS pins for low-impedance current return and supply routing.

Pin/Terminal	Circuit Role	Design Meaning
1, 18, 19, 36	GND	Reference ground; all four pins must be externally connected to sustain full output current and thermal performance
2, 35	OUT6	6 A high-side driver output; no internal GND-reverse diode; protected against open load and overcurrent
3–5	OUT1–OUT3	Half-bridge outputs; each integrates complementary DMOS high-/low-side switches with bulk-drain freewheeling diodes
6, 7, 14, 25, 28, 32	VS	Main power supply input (7–28 V); six pins required for low-impedance connection to battery rail
8	DI	SPI data input (CMOS level); receives 24-bit command word LSB-first from MCU
9	CM/PWM2	Bidirectional pin: current monitor output (1:10,000 scaling) or secondary PWM input for OUT5
10	CSN	Active-low SPI chip select; enables serial communication and enters test mode when held low during power-up
11	DO	SPI data output (tri-state); delivers 24-bit status register on CSN low; high-impedance otherwise
12	VCC	Logic supply (4.5–5.3 V); requires local ceramic decoupling to GND
13	CLK	SPI clock input (CMOS level); controls internal shift register timing
26	CP	Charge pump output; provides boosted gate drive (V_S+6 to V_S+13 V) for external reverse-polarity N-MOSFET
27	PWM1	Hardware PWM input controlling OUT1–OUT4 and OUT6; bypasses SPI for time-critical actuation
31, 33	OUT4, OUT5	1.5 A high-side drivers; intended for resistive loads (e.g., mirror defroster, 10 W bulbs); open-load protected

Key Features

Feature	Design Value
Programmable Softstart	Configurable ramp rate for inductive loads (e.g., mirror motors) to limit inrush current >6 A without triggering overcurrent fault
Current Monitor Outputs	Analog current sense on OUT1, OUT4, OUT5, and OUT6 with 1:10,000 scaling and ±8% accuracy - enables closed-loop current regulation
Reverse Polarity Protection Support	Integrated charge pump (V_CP = V_S+6 to V_S+13 V) drives external N-channel MOSFET gate - eliminates need for bulky series P-MOSFET
Dual Supply Architecture	Independent VS (7–28 V) and VCC (4.5–5.3 V) rails - isolates noisy battery transients from logic circuitry and improves EMC robustness
Comprehensive Diagnostics	Per-output open-load detection (15–60 mA), overload flagging, junction temperature warning (130 °C), and thermal shutdown (170 °C)

Applications

Mirror Axis Control

Mirror Defroster Drive

Use Scenario: Bidirectional positioning of side-view mirrors using DC motors.

IC Role / Device Role / Timing Role: Half-bridge driver (OUT1–OUT3) delivers ±1.5 A with PWM-controlled direction and braking; SPI reports stall or open-circuit faults.

Use Value: Enables precise, noise-immune motor control with real-time diagnostics - reduces ECU software overhead and improves ASIL-B functional safety compliance.

Use Scenario: Heating element activation in rearview/side mirrors under low-temperature conditions.

IC Role / Device Role / Timing Role: High-side driver (OUT6) supplies up to 6 A to resistive defroster trace; programmable softstart prevents cold-resistance surge.

Use Value: Eliminates inrush-triggered fuse blowing and supports rapid thermal response while maintaining diagnostic visibility.

Door Light Control

Lock/Folder Actuation

Use Scenario: Switching 10 W incandescent or LED bulbs for interior door lighting.

IC Role / Device Role / Timing Role: High-side drivers (OUT4/OUT5) deliver −1.5 A with open-load detection - confirms bulb integrity before illumination.

Use Value: Prevents false "bulb-out" warnings and enables predictive maintenance via continuous filament health monitoring.

Use Scenario: Driving solenoid-based door lock actuators or folder mechanisms.

IC Role / Device Role / Timing Role: Half-bridge (OUT1–OUT3) provides controlled energy delivery with cross-current protection and thermal foldback.

Use Value: Ensures reliable mechanical engagement under voltage sag (e.g., cranking) and avoids coil burnout during extended hold states.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLE9201SE	Single half-bridge (2.8 A), no integrated current monitor; SPI interface limited to status only (no command write)	Lacks multi-output integration - requires 3× TLE9201SE + external logic for same functionality as L9954	Use only when system-level consolidation is not required and cost-per-channel is prioritized over board space and diagnostic depth.
BD37102EFV	Three half-bridges (1.2 A), no high-side drivers; analog current sense only on one channel; no charge pump	Cannot drive mirror defroster or bulbs directly - needs external high-side switches and reverse-polarity circuitry	Select if application uses only motor control and external components are acceptable for non-motor loads.

Compared with TLE9201SE and BD37102EFV, the L9954 provides unified control of mixed motor/resistive loads in a single package, with deeper diagnostics (per-output open-load, current monitor on four channels), integrated reverse-polarity support, and higher peak current capability - reducing BOM count and improving functional safety coverage.

Availability

L9954 is available at Aetrix Electronics and suitable for automotive door module design, mirror actuation systems, and body control unit (BCU) subassemblies requiring stable component supply across production lifecycles.

Supply support for L9954 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 certification to AEC-Q100 and ISO 26262 standards.

The L9954 belongs to ST's automotive smart-power driver family, engineered specifically for body electronics applications demanding high integration, robust diagnostics, and ASIL-ready fault handling in harsh vehicle environments.

FAQ

What is the maximum allowable junction temperature for continuous operation?

The L9954 specifies an operating junction temperature range of −40 °C to +150 °C. Thermal shutdown activates at +170 °C (rising), with hysteresis of +5 K, returning to active mode at +150 °C (falling). Sustained operation above +150 °C risks derating and reduced reliability; thermal design must maintain T_j ≤ 130 °C to avoid temperature warning flag assertion.

Can OUT4 and OUT5 drive 12 V, 10 W incandescent bulbs directly?

Yes - OUT4 and OUT5 are rated for −3 A source current at V_S = 13.5 V and T_j = 25 °C, well above the ~0.83 A required for a 10 W bulb at 12 V. Their 800 mΩ typical R_ON yields <1 V drop at full load, ensuring >11 V delivered to the filament. Open-load diagnostics confirm bulb integrity during startup and runtime.

How does the charge pump (CP pin) interface with external reverse-polarity protection?

The CP pin delivers a boosted voltage (V_S + 6 to V_S + 13 V) to drive the gate of an external N-channel MOSFET placed between battery and VS. This configuration replaces less efficient P-MOSFET solutions, reducing conduction loss and footprint. The CP output sustains ≥95 µA at V_CP = V_S + 10 V, sufficient for standard automotive N-MOSFET gate capacitance.

Is PWM1 compatible with standard 5 V MCU GPIO outputs?

Yes - PWM1 accepts CMOS logic levels referenced to VCC (4.5–5.3 V). A 5 V-tolerant MCU GPIO can directly drive it without level-shifting. The input supports standard PWM frequencies up to 20 kHz, and its signal path bypasses the SPI interface to enable deterministic, low-latency actuation for time-critical functions like emergency lock engagement.

L9954 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: PowerSO-36 Exposed Bottom Pad

Packaging:: Tube

Product Status:: Obsolete

Applications:: -

Current - Supply:: 7mA

Voltage - Supply:: 7V ~ 28V

Operating Temperature:: -40°C ~ 150°C

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSO-36

L9954 FAQ

1.How can I place an order for L9954 through Aetrix?

Please submit a Request for Quotation (RFQ) for L9954 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 L9954 reliable?

The price and inventory of L9954 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9954 is usually 5 days.

3.What payment methods are accepted for L9954?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9954 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9954?

L9954 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9954 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 L9954?

For technical support, including L9954 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9954 requirements.

6.How does Aetrix verify that L9954 is sourced from the original manufacturer or authorized distributors?

All L9954 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 L9954 meets industry standards.

7.What is the process for return or replacement of L9954?

All L9954 units undergo pre-shipment inspection (PSI). If there is an issue with L9954, 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 L9954 part is unused and in its original packaging.

Return procedure for L9954:

1.Submit a request within 90 days.

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

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