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

STMicroelectronics L9950TR

Name: L9950TR
Brand: STMicroelectronics
SKU: L9950TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9950TR

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: 36-PowerBSSOP (0.433", 11.00mm Width)

Datasheet:: L9950TR.pdf

Description:: IC DRIVER DOOR ACTUATOR PWRSO-36

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Product details

Overview

L9950TR from STMicroelectronics is an automotive-grade multifunctional door actuator driver IC integrating six half-bridge outputs (including three 1.5 A, two 3 A, and one 6 A full-bridge), five high-side drivers (one 6 A and four 1.5 A), programmable soft-start, current monitoring for 100/150/300 mΩ outputs, and SPI-controlled diagnostics. It drives up to five DC motors and five resistive loads in vehicle door modules - specifically supporting door lock, safe lock, mirror axis/fold control, and mirror defroster.

For engineers reviewing the L9950TR datasheet, L9950TR pinout, L9950TR application, or L9950TR equivalent, this device requires attention to its dual power supply (VS/VCC), SPI register mapping for fault reporting, thermal shutdown thresholds (170 °C), and output-specific R_ON derating across temperature and voltage.

Technical Context

The L9950TR implements a microcontroller-driven architecture with a standard 24-bit SPI interface for command input (forward/reverse/brake/hi-Z) and diagnostic readback. All 11 outputs feature independent open-load, overload, and overtemperature protection, with status reported via dedicated SPI status registers.

It supports dual-domain power management: VS (7–28 V) powers all output stages and includes UV/OV detection (5.9–7.2 V UV-on, 17.5–22 V OV-off), while VCC (4.5–5.3 V) supplies logic and enables standby mode with I_S < 6 µA typical. The charge pump output (CP) drives an external N-MOSFET for reverse polarity protection.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Configuration	1×6 A full-bridge (OUT1–OUT3), 2×3 A half-bridges (OUT4–OUT5), 2×1.5 A half-bridges (OUT6, OUT7–OUT8), 1×6 A high-side (OUT11), 4×1.5 A high-sides (OUT9–OUT10)
R_ON (Typ, 25°C)	150 mΩ (6 A full-bridge), 300 mΩ (3 A half-bridge), 800 mΩ (1.5 A high-side) - defines conduction loss and thermal design margin
Current Monitoring	1/10,000 scaling on OUT1/4/5/6/11; ±4% +1%FS accuracy at 500 mA–5.9 A - enables real-time load current feedback without shunt resistor
Thermal Protection	Temperature warning at 150 °C (rising), shutdown at 170 °C (rising); 5 K hysteresis - prevents latch-up during transient overloads
Standby Current	I_S < 6 µA typ (VS only), I_CC < 25 µA typ (VCC only) at T_j ≤ 85 °C - enables low-power vehicle keep-alive states
SPI Interface	24-bit serial command/data register; CSN-active, CMOS-level DI/DO/CLK; DO tristate when CSN high - ensures deterministic microcontroller communication and fault diagnosis

Pinout & Package

Package: PowerSO-36 (exposed thermal pad, surface-mount, RoHS-compliant). Pin count: 36 leads with multiple GND, VS, and output pins paralleled for current sharing and thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
1, 18, 19, 36	GND	Power ground reference; all four pins must be externally connected to maintain full output current capability and thermal dissipation
2, 35	OUT11	6 A high-side driver output for mirror defroster or safety lighting; no internal GND-reverse diode - requires external flyback path
3–5, 16–17, 20–22, 23	OUT1–OUT8	Half-bridge outputs (1.5 A–6 A); internally connected HS/LS DMOS with bulk-drain diodes - supports bidirectional motor control and braking
30–31, 33–34	OUT7–OUT10	1.5 A high-side outputs for exterior lights (footstep, turn indicator); open-load diagnostic enabled per channel
6–7, 14–15, 24–25, 29, 32–33	VS	Main power supply (7–28 V); nine pins require low-ESR ceramic decoupling near GND to suppress switching noise and sustain peak current
8, 13	DI, CLK	SPI data input and clock; CMOS-level, 24-bit frame synchronized to CSN falling edge - determines command latency and update rate
9	CM/PWM2	Bidirectional pin: current monitor output (1/10,000 scaling) or secondary PWM input for OUT9/OUT10 - enables analog sensing or hardware PWM override
10	CSN	Active-low chip select; >7.5 V triggers test mode - critical for SPI arbitration and fault-safe initialization sequence
11	DO	SPI status data output; tristate when CSN high - allows daisy-chaining or shared bus with pull-up termination
12	VCC	Logic supply (4.5–5.3 V); requires local 100 nF ceramic decoupling - powers SPI interface and register logic independently of VS
26	CP	Charge pump output (6–13 V); drives gate of external N-MOSFET for reverse polarity protection - eliminates need for series Schottky diode
27	PWM1	Hardware PWM input controlling OUT1–OUT8 and OUT11; overrides SPI commands - used for fail-safe or fast-response actuation

Key Features

Feature	Design Value
Programmable soft-start	Configurable ramp time for high-inrush loads (e.g., cold mirror defroster or lock solenoid) - prevents VS droop and false UV detection
All-output diagnostics	Per-channel open-load, overload, and overtemperature reporting via SPI status register - enables predictive maintenance and ECU-level fault classification
Low-quiescent standby	<31 µA total (I_S + I_CC) at -40 °C to 25 °C - meets automotive "parking mode" current budgets for body control modules
Reverse polarity protection support	Integrated charge pump (CP) drives external N-MOSFET - achieves <100 mΩ protection path vs. ~500 mΩ with discrete P-MOS, reducing heat and footprint
EMC-optimized layout aids	Dedicated ferrite recommendations (vs. 10 Ω resistors) on µC interface lines and CP pin - lowers radiated emissions in constrained door module space

Applications

Door Lock Actuation

Mirror Fold Control

Use Scenario: Electromechanical locking/unlocking of vehicle doors under CAN/LIN command.

IC Role / Device Role / Timing Role: Full-bridge (OUT1–OUT3) drives bidirectional 6 A lock motor; SPI reports stall condition via overload flag within 2 ms.

Use Value: Eliminates discrete H-bridge + sense resistor + comparator; reduces BOM by 11 components and PCB area by 35 mm².

Use Scenario: Motorized folding/unfolding of side mirrors during parking or vehicle entry/exit.

IC Role / Device Role / Timing Role: Half-bridge (OUT4–OUT5) controls 3 A mirror fold motor; programmable soft-start prevents 8 A inrush at cold start (-40 °C).

Use Value: Enables precise position control via PWM duty cycle; open-load diagnostic detects broken gear train before mechanical failure.

Mirror Defroster Drive

Exterior Lighting Control

Use Scenario: Rapid heating of mirror glass surface using resistive trace elements (10 W, 12 V).

IC Role / Device Role / Timing Role: High-side driver (OUT11) delivers 6 A pulsed current; current monitor (CM) validates heater continuity pre-activation.

Use Value: Replaces relay + fuse + sense circuit; achieves <50 ms defrost enable time and built-in short-circuit shutdown.

Use Scenario: Independent on/off and dimming control of four 10 W footstep and turn indicator bulbs.

IC Role / Device Role / Timing Role: Four 1.5 A high-side drivers (OUT9–OUT10) switch grounded bulbs; PWM1 input enables hardware dimming without MCU intervention.

Use Value: Supports PWM dimming at 100–500 Hz; overload detection distinguishes bulb burnout (open) from shorted harness (overcurrent).

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 6 A half-bridge only; no integrated SPI, current monitor, or multi-output configuration	Requires external MCU GPIOs, ADC, and protection logic for equivalent functionality	Choose only for cost-sensitive single-motor designs where diagnostics and integration are secondary
VNQ7E100AJ	Quad 1.5 A high-side driver; no half-bridges, no soft-start, no current monitor output	Limited to resistive loads only; cannot drive bidirectional motors or handle inductive kickback autonomously	Select when driving only lamps or solenoids without motor control or advanced diagnostics

Compared with L9950TR, TLE9201SE lacks integrated diagnostics and multi-output flexibility, while VNQ7E100AJ omits motor-driving capability entirely - making L9950TR the sole solution for full-featured, SPI-managed door module integration.

Availability

L9950TR is available at Aetrix Electronics and suitable for automotive body control modules, door module assemblies, and mirror actuation systems requiring stable component supply, AEC-Q100 Grade 1 qualification, and long-term production continuity.

Supply support for L9950TR 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 manufacturing scale and AEC-Q100 validation infrastructure.

The L9950TR belongs to ST's automotive smart-power family, designed specifically for centralized door module integration - consolidating motor drivers, lighting switches, diagnostics, and protection into a single AEC-Q100 qualified package.

FAQ

What is the maximum allowable junction temperature before thermal shutdown activates?

Thermal shutdown triggers at a junction temperature of 170 °C when rising, with hysteresis of 5 K - meaning recovery occurs only after T_j drops to 150 °C or below. This threshold is fixed and not user-configurable; it is monitored continuously by on-die thermal sensors independent of SPI status reads.

Can the L9950TR drive a 12 V, 24 W mirror heater without external components?

Yes - the 6 A high-side driver (OUT11) supports continuous 2 A at 12 V (24 W) with R_ON = 100 mΩ max at 125 °C, resulting in <250 mW conduction loss. No external current-sense resistor or protection MOSFET is needed, though a flyback diode is required due to absence of internal GND-reverse diode.

How does the current monitor function differ across output types?

The current monitor (CM/PWM2 pin) provides 1/10,000 scaled current only for OUT1, OUT4, OUT5, OUT6, and OUT11 - those with 100/150/300 mΩ R_ON. It does not monitor OUT2/OUT3/OUT7–OUT10 (800 mΩ outputs). Accuracy is ±4% +1%FS at 500 mA–5.9 A, referenced to VCC = 5 V.

Is the L9950TR compatible with 3.3 V microcontrollers?

No - the SPI interface (DI, DO, CLK, CSN) requires CMOS logic levels referenced to VCC (4.5–5.3 V), and VCC must be supplied externally at that range. Direct connection to 3.3 V MCUs will violate absolute maximum ratings; level-shifting circuitry is mandatory for interoperability.

L9950TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 36-PowerBSSOP (0.433", 11.00mm Width)

Packaging:: Tape & Reel (TR)

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:: PowerSO-36, Bottom Pad

L9950TR FAQ

1.How can I place an order for L9950TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9950TR 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 L9950TR reliable?

The price and inventory of L9950TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9950TR is usually 5 days.

3.What payment methods are accepted for L9950TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9950TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9950TR?

L9950TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9950TR 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 L9950TR?

For technical support, including L9950TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9950TR requirements.

6.How does Aetrix verify that L9950TR is sourced from the original manufacturer or authorized distributors?

All L9950TR 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 L9950TR meets industry standards.

7.What is the process for return or replacement of L9950TR?

All L9950TR units undergo pre-shipment inspection (PSI). If there is an issue with L9950TR, 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 L9950TR part is unused and in its original packaging.

Return procedure for L9950TR:

1.Submit a request within 90 days.

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

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