Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

STMicroelectronics L9949

Name: L9949
Brand: STMicroelectronics
SKU: L9949
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: L9949

Manufacturer:: STMicroelectronics

Category:: Power Management - Specialized

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

Datasheet:: L9949.pdf

Description:: IC DRIVER DOOR ACTUATOR PWRSO-20

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,538

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

L9949 from STMicroelectronics is an automotive-grade, microprocessor-controlled power interface IC integrating one full bridge (6 A, R_ON = 150 mΩ), three half bridges (1.6 A, R_ON = 800 mΩ), and one high-side driver (6 A, R_ON = 100 mΩ) in PowerSO-20 package. It features SPI control, current monitoring, open/overload/thermal diagnostics, and <6 µA standby current - deployed in door latch actuators, mirror axis control, and mirror defrosters.

For engineers reviewing the L9949 datasheet, L9949 pinout, L9949 application, or L9949 equivalent, this device supports precise motor direction control (forward/reverse/brake), real-time fault diagnosis via SPI status registers, current-sense-based load state detection (free-running vs. blocked), and robust protection against overvoltage (22 V), undervoltage (6 V), and thermal shutdown (180 °C).

Technical Context

The L9949 implements a multi-output power driver architecture with independent gate drive for six output channels: OUT1–OUT5 use complementary high-side/low-side DMOS stages with integrated reverse diodes for inductive loads; OUT6 is a dedicated high-side-only driver optimized for resistive heating elements. All outputs share centralized diagnostic logic with 10 µs–0.5 ms filtered fault detection.

It operates from dual supplies: VS (7–28 V battery rail) powers all drivers and internal charge-pump for high-side gate bias; VCC (4.5–5.5 V stabilized logic supply) powers SPI, registers, and diagnostics - ensuring status retention during VS transients. Standby mode disables outputs and reduces total quiescent current to ≤90 µA.

Key Specifications

Parameter	Value and Actual Design Meaning
Full Bridge Output	OUT1: ±6 A continuous, R_ON = 150 mΩ @ 13.5 V/25 °C - enables direct driving of 12 V DC door latch solenoids without external freewheeling diodes.
Half Bridge Outputs	OUT2–OUT5: ±1.6 A continuous, R_ON = 800 mΩ @ 13.5 V/25 °C - supports bidirectional control of small PMDC motors for mirror tilt/pan axes.
High-Side Driver	OUT6: 6.3 A source capability, R_ON = 100 mΩ @ 13.5 V/25 °C - drives resistive mirror defroster elements with minimal I²R loss and no external high-side FET required.
Diagnostic Resolution	Open-load detection threshold: 80–320 mA per channel; overload trip time: ≥10 µs - ensures fast, noise-immune fault response without false triggering on PWM edges.
Current Monitor Accuracy	ICM = I_OUT/10000 ±(4% + 1%FS); FS = 600 µA - enables ±6 A load current measurement with ±240 mA absolute error, sufficient for motor stall detection.
Thermal Protection	T_j warning at 150 °C (hysteresis 10 K); thermal shutdown at 180 °C - prevents permanent damage during sustained overload or poor heatsinking.
Supply Robustness	VS UVLO: 6 V (off) / 7.6 V (on); OVLO: 22 V (off) / 18 V (on); VCC POR: 4.2 V (on) / 3.4 V (off) - maintains safe operation across automotive battery cold-crank and load-dump conditions.

Pinout & Package

Package: PowerSO-20 (exposed die pad, 6×6 mm), thermally enhanced for automotive under-hood mounting. GND and VS pins are multiplexed across four pins each to minimize PCB trace resistance and ensure full-current capability.

Pin	Circuit Role	Design Meaning
1,10,11,20	GND	Power and signal reference ground - all four pins must be externally shorted to handle >10 A return currents and minimize ground bounce.
5,8,13,18	VS	Battery supply input (7–28 V) - feeds full bridge, half bridges, and high-side driver; requires local ceramic decoupling to GND.
15	VCC	Stabilized 5 V logic supply - powers SPI, registers, and diagnostics; independent of VS to retain state during battery transients.
14	CSN	Active-low SPI chip select - enables DO output and initiates data transfer; >9.6 V above VCC triggers test mode.
6	CLK	SPI clock input - sampled on rising edge; supports CPOL/CPHA = 0 or 1 modes for MCU compatibility.
7	DI	SPI data input - receives 16-bit control word (LSB first) defining output states, current monitor selection, and standby mode.
17	DO	SPI data output - tristate when CSN high; reflects status register bits (fault summary or full diagnostic data) when CSN low.
16	CM	Current monitor output - sources I_OUTx/10000 (x = OUT1, OUT2, or OUT6 per bits 12–13) for analog load analysis.
9,12,2,3,4	OUT1–OUT5	Half/full bridge outputs - OUT1 is full bridge; OUT2–OUT5 are half bridges; each integrates complementary DMOS with bulk diodes for inductive loads.
19	OUT6	High-side driver output - single N-channel DMOS stage; requires external freewheeling diode for inductive loads >100 µH.

Key Features

Feature	Design Value
Integrated SPI Interface	16-bit command/status register access with LSB-first protocol and fault-polling mode (DO reflects OR'ed status bits when CSN low).
Multi-Channel Diagnostics	Per-output open-load, overload, and temperature warning flags - filtered (0.5 ms/10 µs) to reject EMI while preserving fault detection integrity.
Current Monitoring	Hardware-multiplexed current sense (OUT1/OUT2/OUT6) with 1:10000 scaling and ±4% accuracy - enables motor state classification (free-run, loaded, stalled).
Robust Power Architecture	Dual-supply design (VS + VCC) with independent POR/UVLO/OVLO thresholds - guarantees deterministic reset behavior and status retention during battery fluctuations.
Automotive Thermal Management	Programmable standby mode (<6 µA IS + ICC) and thermal hysteresis (10 K) - extends reliability in high-ambient environments like door modules and mirror housings.

Applications

Door Latch Actuation

Mirror Tilt/Pan Control

Use Scenario: Electromechanical door latch release using a 12 V DC solenoid requiring bidirectional force (pull-in and hold).

IC Role / Device Role / Timing Role: Full bridge (OUT1) delivers controlled forward/reverse current to energize/de-energize solenoid coil; SPI enables precise timing of brake and high-Z states.

Use Value: Eliminates need for external H-bridge FETs and flyback diodes; integrated overload protection prevents coil burnout during mechanical jam.

Use Scenario: Two-axis adjustment of exterior rearview mirror via two independent PMDC motors (tilt + pan).

IC Role / Device Role / Timing Role: Half bridges (OUT2 & OUT3) drive each motor with forward/reverse/brake commands; open-load detection confirms motor connection integrity.

Use Value: Single-chip solution replaces discrete half-bridge drivers; current monitor helps detect gear binding or motor stall before thermal shutdown.

Mirror Defroster Heating

Seat Position Motor Control

Use Scenario: Resistive heating element embedded in mirror glass to clear condensation/frost at low ambient temperatures.

IC Role / Device Role / Timing Role: High-side driver (OUT6) switches 12 V to heating element; current monitor verifies power delivery and detects open-circuit failure.

Use Value: Low R_ON (100 mΩ) minimizes self-heating; thermal shutdown (180 °C) protects against overheating due to element detachment or airflow blockage.

Use Scenario: Linear seat position adjustment using a 12 V brushed DC motor with feedback potentiometer.

IC Role / Device Role / Timing Role: Half bridge (OUT4) controls motor direction; overload detection identifies mechanical obstruction (e.g., foreign object in track).

Use Value: Integrated diagnostics reduce need for external current sensing; programmable dead time (5–200 µs) prevents shoot-through during direction reversal.

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
BD37101FV	Single full bridge only (3 A), no half bridges or current monitor; SOIC-16 package; lacks SPI interface - uses parallel control inputs.	Supports basic door latch but cannot replace L9949's 5-output topology or diagnostic depth; unsuitable for mirror axis + defroster integration.	Select only if system requires minimal channel count and accepts manual fault flag polling instead of SPI-based diagnostics.
TPIC2603D	Three high-side drivers (3 A each), no full/half bridges; HTSSOP-20; includes PWM input support but no current monitor or open-load detection.	Applicable to resistive loads (e.g., defroster only) but cannot drive bidirectional motors; lacks integrated protection for inductive switching.	Choose only for pure high-side switching applications where motor control and advanced diagnostics are not required.

Compared with BD37101FV and TPIC2603D, the L9949 uniquely consolidates full/half/high-side topologies, SPI-configurable diagnostics, and current monitoring in one PowerSO-20 package - enabling compact, functionally complete door/mirror actuator modules without external protection or sensing components.

Availability

L9949 is available at Aetrix Electronics and suitable for automotive body electronics, seat/mirror actuation systems, and door module designs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for L9949 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 qualification expertise.

The L9949 belongs to ST's "Automotive Smart Power" product line, designed specifically for intelligent, protected, and communication-enabled power actuation in vehicle body control modules - emphasizing integration, diagnostics, and thermal resilience.

FAQ

What is the maximum allowable inductive energy for OUT6?

OUT6 is rated for resistive loads only; its internal ESD diode can dissipate <1 mJ in freewheeling condition. For inductive loads exceeding 100 µH, an external Schottky freewheeling diode from OUT6 to GND is mandatory to prevent destructive voltage spikes and ensure safe energy dissipation.

How does the L9949 handle simultaneous faults across multiple outputs?

The L9949 latches individual fault bits (open-load, overload, thermal) per output in Status Registers 0 and 1. A global fault flag (bit 0 of DO output) is the logical OR of all status bits, allowing rapid fault presence detection without full SPI read. Each fault must be cleared individually via SPI write before re-enabling the affected output.

Can the current monitor output (CM) be used for closed-loop motor control?

No - the CM pin provides a unidirectional, scaled current image (I_OUT/10000) with ±4% accuracy and 10 µA resolution, suitable for load state monitoring (e.g., stall detection) but not for real-time torque or speed regulation. It lacks bidirectional polarity support and bandwidth for servo-loop feedback.

What happens to output states during VCC undervoltage?

When VCC drops below 3.4 V (VVCC ON), the L9949 forces all outputs into high-impedance state and clears status registers to prevent erratic switching. This behavior preserves load safety and avoids uncontrolled current flow during brown-out conditions, with automatic recovery once VCC rises above 4.2 V.

L9949 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

L9949 FAQ

1.How can I place an order for L9949 through Aetrix?

Please submit a Request for Quotation (RFQ) for L9949 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 L9949 reliable?

The price and inventory of L9949 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9949 is usually 5 days.

3.What payment methods are accepted for L9949?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9949 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9949?

L9949 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9949 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 L9949?

For technical support, including L9949 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9949 requirements.

6.How does Aetrix verify that L9949 is sourced from the original manufacturer or authorized distributors?

All L9949 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 L9949 meets industry standards.

7.What is the process for return or replacement of L9949?

All L9949 units undergo pre-shipment inspection (PSI). If there is an issue with L9949, 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 L9949 part is unused and in its original packaging.

Return procedure for L9949:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-08 Obsolete Electronic Components: How to Source and Evaluate Replacements

A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.

2026-09-07 TTL vs CMOS Logic Levels: 74HC and 74HCT Compatibility Explained

TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.

2026-09-04 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-02 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…