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

STMicroelectronics L9949TR

Name: L9949TR
Brand: STMicroelectronics
SKU: L9949TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9949TR

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

Package:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Datasheet:: L9949TR.pdf

Description:: IC DRIVER DOOR ACTUATOR PWRSO-20

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L9949TR from STMicroelectronics is an automotive-grade multi-output power driver IC integrating one full bridge (6 A, R_ON = 150 mΩ), three half bridges (1.6 A, R_ON = 800 mΩ each), and one high-side driver (6 A, R_ON = 100 mΩ), all with SPI control, open-load/overload/thermal diagnostics, and current monitoring - used for door latch actuators, mirror axis control, and mirror defrosters in 12 V vehicle systems.

For engineers reviewing the L9949TR datasheet, L9949TR pinout, L9949TR application, or L9949TR equivalent, this device supports precise motor direction control via SPI-configurable forward/reverse/brake modes, delivers diagnostic status through DO pin polling or full SPI readback, and enables real-time load analysis via 1:10,000-ratio current monitor output for OUT1, OUT2, or OUT6.

Technical Context

The L9949TR implements a dual-supply architecture: VS (7–28 V) powers all power stages and internal charge-pump for high-side gate drive, while stabilized VCC (4.5–5.5 V) supplies logic and SPI interface - ensuring fault resilience during battery transients. Its MultiPower BCD60III process enables integrated DMOS output stages with built-in reverse diodes on all half-bridge outputs (OUT1–OUT5), eliminating external freewheeling diodes for DC motors.

All six outputs feature independent protection: open-load detection (500–3000 µs filter), overload shutdown (10–100 µs response), thermal warning (T_j = 150 °C) and shutdown (T_j = 180 °C), plus VS overvoltage (22 V) and undervoltage (6 V) lockout. The SPI interface supports CPOL/CPHA = 0 or 1, LSB-first 16-bit transfers, and single-bit fault polling via CSN low.

Key Specifications

Parameter	Value and Actual Design Meaning
Full Bridge Output	6 A continuous, R_ON = 150 mΩ @ 13.5 V/25 °C - supports bidirectional 12 V DC motors up to ~30 W without external heatsink.
Half Bridge Outputs (×3)	1.6 A continuous per channel, R_ON = 800 mΩ @ 13.5 V/25 °C - drives small-positioning motors (e.g., mirror tilt/pan) with integrated freewheeling.
High-Side Driver Output	6 A resistive load only, R_ON = 100 mΩ @ 13.5 V/25 °C - suitable for mirror defroster heating elements; requires external flyback diode for inductive loads >100 µH.
Standby Current	< 6 µA @ T_j ≤ 85 °C with V_CC = 0 V - enables ultra-low-power sleep mode for body electronics modules meeting OEM quiescent current budgets.
SPI Interface	16-bit LSB-first, CPOL/CPHA = 0 or 1 compatible, DO pin supports single-bit fault polling - reduces MCU GPIO count and simplifies diagnostic integration.
Diagnostic Coverage	Open-load, overload, thermal warning/shutdown, VS over/undervoltage - all filtered (≥10 µs–0.5 ms) for noise immunity; status bits cleared by MCU to re-enable drivers.
Current Monitor	1:10,000 fixed-ratio current image of OUT1/OUT2/OUT6 - enables motor stall detection, heating element temperature estimation, and closed-loop current feedback without shunt resistor.

Pinout & Package

Package: PowerSO-20 (exposed die pad, 6 × 6 mm), thermally enhanced for automotive under-hood operation; requires all four GND and four VS pins to be externally connected for full-current capability.

Pin	Circuit Role	Design Meaning
1,10,11,20	GND	Reference ground for logic and power stages; all four pins must be connected to minimize IR drop and ensure thermal stability.
5,8,13,18	VS	Battery supply input (7–28 V); powers full/half bridges and high-side charge pump; decoupling capacitor required near pin.
15	VCC	Stabilized 5 V logic supply; powers SPI, registers, and diagnostics; independent of VS to maintain control during battery dips.
14	CSN	Active-low chip select; enables SPI communication and activates DO output; >9.6 V above VCC enters test mode.
6	CLK	SPI clock input; sampled on rising edge; supports CPOL = 0 (idle low) or CPOL = 1 (idle high).
7	DI	SPI data input; 16-bit control word (LSB first) configures output states, current monitor selection, and standby mode.
17	DO	SPI data output; tristate when CSN high; reflects status register bits or single-bit fault OR during CSN low.
16	CM	Current monitor output; sources I_OUT/10000 for OUT1, OUT2, or OUT6 based on Input Data Register bits 12–13.
9,12,2,3,4	OUT1–OUT5	Half-bridge outputs (HS+LS DMOS); each includes internal bulk diodes for inductive freewheeling; protected against open/overload/thermal faults.
19	OUT6	High-side driver only; no internal low-side path or GND-referenced diode; intended for resistive loads; requires external flyback diode if inductive.

Key Features

Feature	Design Value
Integrated Diagnostic Engine	Hardware-filtered open-load, overload, thermal, and supply voltage fault detection with dedicated status bits - eliminates need for external sense circuitry and software polling overhead.
Configurable Current Monitoring	Multiplexed 1:10,000 current image of OUT1/OUT2/OUT6 - enables real-time motor state classification (free-run, loaded, stalled) and resistive heater thermal profiling without added components.
Dual Independent Supplies	VS (power) and VCC (logic) domains decoupled - ensures SPI communication and register integrity during battery transients, cold-crank, or load-dump events.
Ultra-Low Standby Consumption	<6 µA quiescent current with VCC = 0 V - meets stringent automotive ISO 16750-2 quiescent current requirements for always-on body control modules.
Robust Output Protection	Per-output short-circuit, overtemperature, and open-load diagnostics with automatic driver disable and MCU-clearable latches - prevents thermal runaway and uncontrolled switching during faults.

Applications

Door Latch Actuation

Mirror Axis Positioning

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

IC Role / Device Role / Timing Role: Full bridge (OUT1–OUT2) drives reversible 12 V DC latch motor; SPI controls direction and braking; diagnostics confirm mechanical engagement.

Use Value: Eliminates discrete H-bridge + protection IC solution; integrated open-load detection verifies latch hook movement without position sensors.

Use Scenario: Precision tilt and pan adjustment of exterior rearview mirrors.

IC Role / Device Role / Timing Role: Three half bridges (OUT3–OUT5) independently drive two-axis mirror motors; SPI enables synchronized multi-axis motion profiles.

Use Value: Reduces BOM count by consolidating three motor drivers; built-in freewheeling diodes remove six external components per motor.

Mirror Defroster Control

Body Control Module Load Driving

Use Scenario: On-demand heating of mirror glass surface using resistive trace elements.

IC Role / Device Role / Timing Role: High-side driver (OUT6) switches 6 A defroster load; current monitor validates heater integrity and detects open traces.

Use Value: Enables closed-loop defrost duration control via real-time current feedback; thermal shutdown prevents overheating during ice-melt cycles.

Use Scenario: Centralized driving of multiple auxiliary loads (e.g., interior lighting, seat adjusters, HVAC dampers) in BCMs.

IC Role / Device Role / Timing Role: Combines full/half/high-side outputs to manage diverse load types (bidirectional motors, unidirectional actuators, resistive heaters) from single IC.

Use Value: Simplifies PCB layout and firmware architecture; unified SPI interface allows scalable expansion across vehicle platforms with minimal code changes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-channel automotive power driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BD3711FV-M	Single full bridge (3 A), no half bridges or current monitor; analog PWM input instead of SPI; lacks open-load detection.	Targeted at simpler motor control (e.g., single-window lift), not multi-function body modules requiring diagnostics and mixed load types.	Select only when SPI interface, diagnostic depth, and multi-output flexibility are unnecessary - lower cost but higher system-level component count.
VNQ5E050K-E	Four independent high-side switches (5 A each), no full/half bridges; SPI-compatible but no current monitor or open-load detection on all channels.	Optimized for distributed high-side switching (e.g., lighting, pumps); cannot drive bidirectional motors or provide mirror axis positioning.	Choose for pure high-side load switching where motor reversal and position feedback are irrelevant - better suited for non-motor actuator applications.

Compared with BD3711FV-M and VNQ5E050K-E, the L9949TR uniquely integrates full/half/high-side topologies with unified SPI control and comprehensive diagnostics - enabling consolidation of up to six discrete drivers into one AEC-Q100 qualified package for complex automotive actuators.

Availability

L9949TR is available at Aetrix Electronics and suitable for automotive door latch systems, exterior mirror control modules, and body control unit load management requiring stable component supply, AEC-Q100 qualification, and long-term production continuity.

Supply support for L9949TR 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, designing and manufacturing microcontrollers, power ICs, sensors, and automotive-grade analog devices.

The L9949TR belongs to ST's Automotive Power Drivers product line, engineered specifically for intelligent, diagnostic-rich actuation in body electronics - targeting reduced system cost, improved reliability, and compliance with ISO 26262 ASIL-B ready architectures.

FAQ

What is the maximum inductive load energy the L9949TR can safely dissipate at OUT6?

The L9949TR's OUT6 high-side driver lacks an internal low-side path or GND-referenced freewheeling diode. Its internal ESD diode can safely dissipate <1 mJ during freewheeling. For inductive loads exceeding 100 µH, an external Schottky diode from OUT6 to GND is mandatory to prevent damage during turn-off.

How does the L9949TR handle battery voltage transients during cold-crank conditions?

The L9949TR uses independent VS and VCC supplies: VS powers the power stages, while VCC (regulated 5 V) sustains logic and SPI operation. During cold-crank (VS down to 3 V), VCC remains active until it drops below 3.4 V, at which point outputs enter high-impedance state - preserving register contents and enabling graceful recovery once voltage stabilizes.

Can the current monitor output (CM) be used simultaneously for multiple outputs?

No. The CM pin multiplexes current from only one selected output at a time - determined by bits 12 and 13 of the Input Data Register (selecting OUT1, OUT2, or OUT6). It cannot monitor more than one output concurrently; sequential sampling via SPI register writes is required for multi-channel current observation.

What happens when an overload condition occurs on OUT3, and how is recovery performed?

When OUT3 experiences overcurrent lasting ≥10 µs, its driver is automatically disabled, and bit 1–11 in Status Register 0 is set. The output remains off until the microcontroller clears that status bit via SPI write. This prevents uncontrolled reactivation and avoids ground bounce or supply noise during fault recovery.

L9949TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-SOIC (0.433", 11.00mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

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-20

L9949TR FAQ

1.How can I place an order for L9949TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9949TR 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 L9949TR reliable?

The price and inventory of L9949TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9949TR is usually 5 days.

3.What payment methods are accepted for L9949TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9949TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9949TR?

L9949TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9949TR 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 L9949TR?

For technical support, including L9949TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9949TR requirements.

6.How does Aetrix verify that L9949TR is sourced from the original manufacturer or authorized distributors?

All L9949TR 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 L9949TR meets industry standards.

7.What is the process for return or replacement of L9949TR?

All L9949TR units undergo pre-shipment inspection (PSI). If there is an issue with L9949TR, 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 L9949TR part is unused and in its original packaging.

Return procedure for L9949TR:

1.Submit a request within 90 days.

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

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