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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Full Half-Bridge (H Bridge) Drivers

STMicroelectronics L99UDL01

Name: L99UDL01
Brand: STMicroelectronics
SKU: L99UDL01
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L99UDL01

Manufacturer:: STMicroelectronics

Category:: Full Half-Bridge (H Bridge) Drivers

Package:: 64-TQFP Exposed Pad

Datasheet:: L99UDL01.pdf

Description:: IC HALF BRIDGE DRIVER 64TQFP

Quantity:: RFQ Add To RFQ list

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Inventory:2,320

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Product details

Overview

L99UDL01 from STMicroelectronics is an AEC-Q100 qualified automotive universal door lock IC featuring six integrated 0.09 Ω half-bridge drivers, two external half-bridge controllers, 4 MHz 24-bit SPI interface, PWM current regulation up to 25 kHz, and 10-bit digital current feedback for load integrity verification - deployed in central door lock systems across passenger vehicles.

For engineers reviewing the L99UDL01 datasheet, L99UDL01 pinout, L99UDL01 application, or L99UDL01 equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative options for door lock actuator control in OEM body electronics designs.

Technical Context

The L99UDL01 implements a dual-mode power architecture: six fully protected integrated half-bridges (OUT1–OUT6) support independent or paralleled operation (up to three per group), while two external half-bridge controllers manage higher-current loads using external N-channel MOSFETs with drain-source monitoring and off-state fault detection.

Its diagnostic subsystem includes open-load, short-to-battery, short-to-ground, and dynamic output state detection - all reported via SPI - plus thermal warning/shutdown, reverse battery protection (with external N-MOSFET), and 2-stage charge pump enabling operation down to 4.5 V supply.

Key Specifications

Parameter	Value and Actual Design Meaning
Half-bridge R_DS(on)	0.09 Ω typical - enables high-efficiency driving of 12 V DC door lock motors with minimal thermal dissipation.
PWM frequency	Up to 25 kHz - suppresses audible motor noise while maintaining precise current regulation.
SPI interface	4 MHz, 24-bit - supports fast, deterministic command/response cycles for real-time diagnostics and actuator sequencing.
Current feedback resolution	10-bit digital - provides 1024-step load current measurement for reliable integrity checks and fault classification.
Standby current	< 10 µA - only wake-up circuit remains active, meeting stringent automotive low-power requirements.
Operating voltage range	4.5 V to 28 V - accommodates cold-crank (4.5 V) and load-dump (28 V) conditions without external regulators.
Package	TQFP64L (10 × 10 mm, exposed pad) - optimized for thermal performance in compact body control modules.

Pinout & Package

TQFP64L package with 0.5 mm pitch and thermally enhanced exposed pad for efficient heat dissipation in automotive under-hood and door module environments.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Main power supply input	Accepts 4.5–28 V; powers internal logic, drivers, and charge pump - monitored for overvoltage/undervoltage faults.
VDDIO	I/O supply input	Provides 3.3 V rail for SPI interface and logic - independently monitored for stability and dropout.
CSN	SPI chip select (active low)	Enables SPI communication; timeout detection prevents bus lock during controller failure.
SCK	SPI clock input	Supports up to 4 MHz; clock monitor detects loss of external clock source and triggers fault reporting.
SDI / SDO	SPI data in / out	Full-duplex 24-bit frame transfer; parity bit ensures data integrity across noisy vehicle harnesses.
EN_OUT	Global output enable	Hardware-level security gate - disables all drivers when asserted low, preventing unauthorized actuation.
DOUT	Diagnostic output	Open-drain status flag indicating global fault condition (e.g., thermal shutdown, SPI CRC error).
OUT1–OUT6	Integrated half-bridge outputs	Each drives one door lock actuator coil; configurable for direction, on-time, current level, and paralleling.
HG1/HG2	External high-side gate drivers	Control external N-MOSFETs for high-current nodes (e.g., trunk release, child lock); include V_DS monitoring.
LG1/LG2	External low-side gate drivers	Complement HG1/HG2 to form full external half-bridges; support off-state fault detection.

Key Features

Feature	Design Value
Configurable output paralleling	Up to three integrated outputs (e.g., OUT1–OUT3) can be grouped and driven in parallel to deliver >6 A continuous current per node.
Two-stage charge pump	Enables full driver functionality at VDD ≥ 4.5 V - critical for cold-crank operation without auxiliary boost circuitry.
10-bit regulated current feedback	Digitally reports actual load current per channel via SPI register (13H–18H), enabling closed-loop integrity validation pre- and post-actuation.
Thermal warning + shutdown	Warns at 150 °C (TWARN) and shuts down at 175 °C (TSD) - protects against latch-up in sealed door modules.
Reverse battery protection	Supported via external N-MOSFET controlled by dedicated gate driver - eliminates need for series diode and associated power loss.

Applications

Front Door Lock Control

Rear Door Lock Control

Use Scenario: Simultaneous locking/unlocking of left/right front doors in response to key fob or BCM command.

IC Role / Device Role / Timing Role: L99UDL01 drives two independent door lock actuators (e.g., OUT1/OUT2) with synchronized PWM current profiles and real-time current feedback.

Use Value: Eliminates discrete driver ICs and external current sense resistors - reduces BOM count by 40% versus dual-driver solutions.

Use Scenario: Independent rear door lock actuation in SUVs with separate child safety lock circuits.

IC Role / Device Role / Timing Role: Uses OUT3–OUT4 for rear locks and OUT5–OUT6 for child lock solenoids, each with programmable on-time and current limit.

Use Value: Enables per-door diagnostics (open/short detection) without additional sensors - improves field failure root-cause accuracy.

Trunk Release Actuation

Centralized Diagnostic Gateway

Use Scenario: High-current trunk release motor activation requiring >5 A peak current beyond integrated driver capability.

IC Role / Device Role / Timing Role: L99UDL01 configures HG1/LG1 as external half-bridge controller, managing external Smart Power devices with V_DS monitoring.

Use Value: Delivers 8 A continuous current with integrated fault detection - avoids adding standalone high-side switch and external sense circuitry.

Use Scenario: Real-time health monitoring of all door lock nodes within body control module firmware.

IC Role / Device Role / Timing Role: Reports global status byte (GSB), per-output diagnostics (10H–12H), and current feedback (13H–18H) via SPI every 5 ms.

Use Value: Enables predictive maintenance alerts (e.g., rising coil resistance trend) and automated ECU-level fault logging per ISO 26262 ASIL-B requirements.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS65381A-Q1	Single 3.3 V/5 V system-basis chip with 2x half-bridges (R_DS(on) = 0.25 Ω), no external FET control, lower integration density.	Targeted at smaller door modules with ≤2 actuators; lacks 10-bit current feedback and paralleling capability.	Select when cost-sensitive, low-pin-count designs require basic lock/unlock only - not for multi-actuator or diagnostic-intensive systems.
MC33883	Three independent high-side switches (no low-side), 0.15 Ω R_DS(on), SPI interface limited to 1 MHz, no integrated current feedback.	Used in legacy door modules with unidirectional solenoid control; requires external H-bridge for reversible actuation.	Choose only for backward compatibility with existing MC33883-based PCB layouts - lacks modern diagnostics and efficiency.

Compared with TPS65381A-Q1 and MC33883, the L99UDL01 uniquely combines six integrated half-bridges, external FET control, 10-bit current feedback, and 25 kHz PWM in a single AEC-Q100 device - making it the only solution capable of full central door lock system integration without supplemental ICs.

Availability

L99UDL01 is available at Aetrix Electronics and suitable for automotive body control modules, central door lock systems, and smart access systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.

Supply support for L99UDL01 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 automotive qualification expertise.

The L99UDL01 belongs to ST's Automotive Power Drivers product line, engineered specifically for intelligent, highly integrated body electronics - emphasizing functional safety, diagnostic depth, and robustness in harsh 12 V vehicle electrical environments.

FAQ

What is the maximum continuous current per integrated half-bridge?

Each integrated half-bridge (OUT1–OUT6) delivers up to 2.5 A continuous current at T_A = 125 °C with proper PCB copper area and thermal vias under the exposed pad. Derating applies above 100 °C ambient; full 3.5 A peak is supported for ≤100 ms pulses per datasheet Table 9.

Does the L99UDL01 support bidirectional motor control for reversible door locks?

Yes - each integrated half-bridge supports full H-bridge operation via independent high-side and low-side driver control, enabling forward/reverse polarity switching for reversible solenoid or DC motor actuators without external components.

How does the 10-bit current feedback improve diagnostic reliability?

The 10-bit ADC digitizes actual load current during actuation and reports it via SPI registers 13H–18H. This enables quantitative comparison against expected values - distinguishing between open coils (0 mA), shorted coils (~10× nominal), and degraded windings (gradual current rise) - far beyond simple pass/fail fault flags.

Can the L99UDL01 enter sleep mode with VDD = 0 V, and how is wake-up achieved?

Yes - in Sleep mode, VDD is disconnected and only the wake-up circuit remains powered via backup capacitor or external keep-alive rail. Wake-up occurs via edge-triggered signal on CSN or dedicated wake pin (WAKE#), restoring full functionality within 100 µs after VDD re-applies.

L99UDL01 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 64-TQFP Exposed Pad

Packaging:: Tray

Product Status:: Active

Output Configuration:: Half Bridge (6)

Applications:: General Purpose

Interface:: Logic, PWM, SPI

Load Type:: Capacitive and Resistive

Technology:: MOSFET (Metal Oxide)

Rds On (Typ):: 90mOhm LS + HS

Current - Output / Channel:: -

Current - Peak Output:: -

Voltage - Supply:: 6V ~ 18V

Voltage - Load:: 6V ~ 18V

Operating Temperature:: -40°C ~ 175°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q100

Features:: Charge Pump, Status Flag

Fault Protection:: Over Current, Over Temperature

Mounting Type:: Surface Mount

Supplier Device Package:: 64-TQFP (10x10)

L99UDL01 FAQ

1.How can I place an order for L99UDL01 through Aetrix?

Please submit a Request for Quotation (RFQ) for L99UDL01 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 L99UDL01 reliable?

The price and inventory of L99UDL01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L99UDL01 is usually 5 days.

3.What payment methods are accepted for L99UDL01?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L99UDL01 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L99UDL01?

L99UDL01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L99UDL01 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 L99UDL01?

For technical support, including L99UDL01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L99UDL01 requirements.

6.How does Aetrix verify that L99UDL01 is sourced from the original manufacturer or authorized distributors?

All L99UDL01 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 L99UDL01 meets industry standards.

7.What is the process for return or replacement of L99UDL01?

All L99UDL01 units undergo pre-shipment inspection (PSI). If there is an issue with L99UDL01, 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 L99UDL01 part is unused and in its original packaging.

Return procedure for L99UDL01:

1.Submit a request within 90 days.

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

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