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

STMicroelectronics L9953

Name: L9953
Brand: STMicroelectronics
SKU: L9953
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9953

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: PowerSO-36 Exposed Bottom Pad

Datasheet:: L9953.pdf

Description:: IC DVR DOOR ACTUATOR POWERSO-36

Quantity:: RFQ Add To RFQ list

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Inventory:2,412

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Product details

Overview

L9953 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 comprehensive diagnostics. It delivers 6A full-bridge drive (OUT4/OUT5, R_ON = 150 mΩ typ), 1.5A half-bridge drive (OUT1–OUT3, R_ON = 800 mΩ typ), and 6A high-side drive (OUT8, R_ON = 100 mΩ typ), supporting door lock, mirror fold/vertical/horizontal control, and defroster/light loads in 12V vehicle systems.

For engineers reviewing the L9953 datasheet, L9953 pinout, L9953 application, or L9953 equivalent, this device requires attention to its dual-supply operation (VS/VCC), programmable softstart for inrush-limited motor startup, SPI-configurable fault reporting (open-load, overload, overtemperature), and charge-pump-based reverse-polarity protection implementation.

Technical Context

The L9953 implements a microcontroller-driven architecture with a 24-bit SPI interface enabling forward/reverse/brake/high-Z control of all eight outputs and real-time readback of status registers containing diagnostic flags. Its integrated charge pump (V_CP = VS + 6 to VS + 13 V) drives external N-MOSFETs for reverse-polarity protection, while dedicated current monitor outputs (CM/PWM2) provide 1:10,000 scaled analog current sensing for OUT1, OUT4, OUT5, and OUT8.

Thermal management includes junction temperature warning at 130°C (typ), thermal shutdown at 170°C (rising), and 20°C hysteresis, complemented by per-output short-circuit, open-load, and overload detection. Standby current is specified at <6 µA (T_j ≤ 85°C), and all outputs feature PWM-controllable switching with configurable softstart timing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Configuration	5 half-bridges (OUT1–OUT5) + 3 high-side drivers (OUT6–OUT8); supports up to 3 DC motors and 3 resistive loads
Full-Bridge Current Rating	±6 A continuous (OUT4/OUT5), R_ON = 150 mΩ typ @ 25°C - enables direct drive of high-power door lock actuators
Half-Bridge Current Rating	±1.5 A continuous (OUT1–OUT3), R_ON = 800 mΩ typ @ 25°C - suitable for mirror axis positioning motors
High-Side Driver Rating	6 A (OUT8), R_ON = 100 mΩ typ @ 25°C - drives 10W mirror defrosters or incandescent bulbs without external FETs
Standby Supply Current	<6 µA typ @ T_j ≤ 85°C - meets automotive low-power sleep mode requirements for always-on body control modules
SPI Interface	24-bit serial peripheral interface with CSN/CLK/DI/DO; supports real-time configuration and diagnostic register readback
Diagnostic Coverage	Per-output open-load, overload, short-circuit, and overtemperature detection; all reported via SPI status registers

Pinout & Package

Package: PowerSO-36 (exposed pad, thermally enhanced) and PowerSSO-36 (surface-mount variant). Both packages support high-current routing with multiple GND and VS pins for low-impedance power distribution.

Pin/Terminal	Circuit Role	Design Meaning
GND (Pins 1,18,19,36)	Ground reference	All four pins must be externally connected to minimize voltage drop and ensure full output current capability
VS (Pins 6,7,14,15,23,25,28,32)	Main power supply input	8–28 V battery rail; all eight pins require low-inductance ceramic decoupling to GND for stable high-current switching
OUT1–OUT5 (Pins 3,4,5,16,17,20,21,24)	Half-bridge outputs	OUT1–OUT3: 1.5A-rated; OUT4–OUT5: 6A-rated; each pair shares internal H/L switches with bulk-drain diodes
OUT6–OUT8 (Pins 31,33,2,35)	High-side driver outputs	OUT6/OUT7: 1.5A resistive load drivers; OUT8: 6A driver with dedicated current monitor path
CM/PWM2 (Pin 9)	Bidirectional current monitor / secondary PWM input	Provides 1:10,000 scaled analog current sense for OUT1/OUT4/OUT5/OUT8; also accepts PWM signal for OUT7 control
CSN (Pin 10)	Active-low SPI chip select	Low-level enables SPI communication; >7.5 V applied forces test mode - used for factory calibration only
CP (Pin 26)	Charge pump output	Generates VS+6 to VS+13 V to drive gate of external N-channel MOSFET for reverse-polarity protection

Key Features

Feature	Design Value
Programmable softstart	Configurable ramp timing prevents inrush current spikes during motor startup - critical for compliant EMI behavior in door modules
Integrated current monitoring	Analog current sense on four outputs (OUT1/OUT4/OUT5/OUT8) with ±4% accuracy enables closed-loop stall detection and load verification
Dual-supply architecture	Independent VS (8–28 V) and VCC (4.5–5.3 V) rails isolate logic integrity from battery transients and reduce noise coupling into SPI interface
Comprehensive diagnostics	Per-output open-load, overload, short-circuit, and overtemperature flags reported via SPI status register - eliminates need for external sense resistors or comparators
Reverse polarity protection support	On-chip charge pump (CP pin) generates boosted gate drive for external N-MOSFET - simplifies robust reverse-battery protection design

Applications

Door Lock Actuation

Mirror Fold Control

Use Scenario: Electromechanical latch release and re-engagement in central locking systems.

IC Role / Device Role / Timing Role: Full-bridge driver (OUT4/OUT5) delivers bidirectional 6A current to lock/unlock solenoids or DC motors with brake and high-Z states.

Use Value: Integrated short-circuit and open-load diagnostics prevent false lock/unlock signals due to wiring faults or actuator failure.

Use Scenario: Motorized folding/unfolding of side-view mirrors in response to vehicle speed or user command.

IC Role / Device Role / Timing Role: Half-bridge (OUT1–OUT3) provides PWM-controlled bidirectional drive to small DC motors with programmable softstart.

Use Value: Softstart function limits peak inrush current during mirror fold initiation, reducing battery voltage sag and EMI emissions.

Mirror Defroster Drive

Interior Light Control

Use Scenario: Heating element activation for anti-fogging on exterior mirror glass surfaces.

IC Role / Device Role / Timing Role: High-side driver (OUT8) supplies 6A resistive load current with current monitoring for thermal derating.

Use Value: On-die current monitor enables real-time power calculation and automatic duty-cycle reduction if overheating is detected.

Use Scenario: Switching of 10W incandescent or LED cabin lights (e.g., map lights, courtesy lamps).

IC Role / Device Role / Timing Role: High-side drivers (OUT6/OUT7) deliver 1.5A to grounded resistive loads with open-load diagnostics.

Use Value: Open-load detection distinguishes between burnt-out bulbs and open wiring - improves serviceability and reduces warranty claims.

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-package 4-channel high-side driver (no half-bridges); lacks integrated current monitor and SPI diagnostics	Requires external H-bridge ICs for motor control; limited to resistive loads only	Choose when only high-side switching is needed and system-level diagnostics are handled externally
VNQ7E100AJ	8-channel high-side driver with embedded current sense but no half-bridge capability or softstart programming	Cannot drive bidirectional motors; unsuitable for mirror axis positioning or lock actuation requiring reversal	Prefer for pure lighting or heater control where directionality and inrush management are irrelevant

Compared with TLE9201SE and VNQ7E100AJ, the L9953 uniquely integrates half-bridge and high-side outputs with SPI-configurable diagnostics and softstart - making it the only single-chip solution for full door module functionality including lock, mirror fold, and defroster.

Availability

L9953 is available at Aetrix Electronics and suitable for automotive body control modules, door module assemblies, and OEM interior electronics requiring stable component supply across extended temperature ranges (−40°C to +150°C junction).

Supply support for L9953 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 ISO/TS 16949-certified manufacturing and AEC-Q100 qualified product lines.

The L9953 belongs to ST's automotive door actuator driver family, engineered specifically for centralized control of mechanical functions in modern vehicle doors - balancing integration, diagnostics, and functional safety readiness.

FAQ

What is the maximum continuous current rating for OUT4 and OUT5?

OUT4 and OUT5 are rated for ±6 A continuous current at T_j = 25°C with R_ON = 150 mΩ (typ). Derating applies above 25°C: R_ON increases to 300 mΩ max at 125°C, limiting practical current to ~4.5 A under sustained high-temperature conditions. Absolute maximum pulsed current is ±10.5 A per Table 11.

How does the programmable softstart function operate?

The softstart function is configured via SPI register bits to adjust the slew rate of output voltage rise during turn-on, reducing inrush current for inductive loads like door lock solenoids. It operates independently per output group and is active only in forward/reverse modes - not during brake or high-Z states.

Can L9953 drive a 12V DC mirror vertical positioning motor bidirectionally?

Yes - OUT1, OUT2, and OUT3 are half-bridges capable of bidirectional 1.5A drive (±1.5 A) with internal H/L DMOS switches and bulk-drain diodes. They support forward, reverse, brake, and high-Z states via SPI commands, and include open-load and overload diagnostics for motor stall detection.

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

Yes - the CP pin provides a boosted gate drive (VS + 6 to VS + 13 V) but does not include the external N-channel MOSFET. A discrete N-MOSFET must be placed between battery and VS input, with its gate driven by CP and source tied to battery - completing the reverse-polarity protection circuit as shown in Figure 1.

L9953 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: PowerSO-36 Exposed Bottom Pad

Packaging:: Tube

Product Status:: Obsolete

Applications:: Door Actuator

Current - Supply:: 7mA

Voltage - Supply:: 7V ~ 28V

Operating Temperature:: -40°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSO-36

L9953 FAQ

1.How can I place an order for L9953 through Aetrix?

Please submit a Request for Quotation (RFQ) for L9953 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 L9953 reliable?

The price and inventory of L9953 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9953 is usually 5 days.

3.What payment methods are accepted for L9953?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9953 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9953?

L9953 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9953 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 L9953?

For technical support, including L9953 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9953 requirements.

6.How does Aetrix verify that L9953 is sourced from the original manufacturer or authorized distributors?

All L9953 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 L9953 meets industry standards.

7.What is the process for return or replacement of L9953?

All L9953 units undergo pre-shipment inspection (PSI). If there is an issue with L9953, 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 L9953 part is unused and in its original packaging.

Return procedure for L9953:

1.Submit a request within 90 days.

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

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