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

STMicroelectronics L9959U-TR-D

Name: L9959U-TR-D
Brand: STMicroelectronics
SKU: L9959U-TR-D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9959U-TR-D

Manufacturer:: STMicroelectronics

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

Package:: 36-PowerFSOP (0.295", 7.50mm Width)

Datasheet:: L9959U-TR-D.pdf

Description:: IC HALF BRIDGE DRVR 3A PWRSSO36

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Product details

Overview

L9959U-TR-D from STMicroelectronics is a single-channel PMOS high-side H-bridge driver in PowerSSO36 package, designed for automotive resistive and inductive load control. It delivers continuous load current >3 A, operates from 5 V to 28 V battery supply, supports SPI-programmable current limiting (5–8.6 A), and integrates full diagnosis, overtemperature/short-circuit protection, and current feedback via CF pin - used in exhaust gas recirculation (EGR) valves and throttle actuators.

For engineers reviewing the L9959U-TR-D datasheet, L9959U-TR-D pinout, L9959U-TR-D application, or L9959U-TR-D equivalent, key selection criteria include its dual enable architecture (/ABE and DIS), 11 kHz max switching frequency, 540 mΩ total path R_DS(on), and 5 V logic compatibility with SPI-configurable PWM/DIR control mode.

Technical Context

The L9959U implements a smart H-bridge power stage with integrated high-side PMOS and low-side NMOS transistors per channel, enabling bidirectional DC motor and solenoid control. Its internal VDD monitor (4.5–5.5 V range) and VS undervoltage detection (5–28 V) ensure safe operation under automotive battery transients.

SPI interface enables real-time configuration of current limit thresholds, diagnostic register access (DIA_REG1/DIA_REG2), and error history logging. Control logic supports both hardware-driven (PWM/DIR) and SPI-driven operation modes, with fast open-drain /ABE and DIS inputs for fail-safe shutdown.

Key Specifications

Parameter	Value and Actual Design Meaning
R_DS(on) (full path)	<540 mΩ: Enables efficient power delivery with minimal conduction loss at >3 A continuous load.
Max switching frequency	11 kHz: Supports precise PWM-based speed/torque control for DC and stepper motors.
Battery supply range (VS)	5 V to 28 V: Compatible with 12 V and 24 V automotive systems including cold-crank and load-dump conditions.
VDD supply range	4.5 V to 5.5 V: Ensures stable logic and monitoring circuitry operation across rail variations.
Current limit programmability	5 A / 6.8 A / 8.6 A (3 steps): SPI-selectable thresholds allow fine-tuned protection for diverse actuator loads.
CF output sensitivity	Proportional current feedback: Enables closed-loop current sensing using external resistor for real-time load monitoring.
Protection features	Overtemperature, short-circuit (SCB/SCG/SCL), open-load, and VS undervoltage: Comprehensive fault coverage reduces need for external supervision circuits.

Pinout & Package

Package: PowerSSO36 (exposed pad), thermally enhanced surface-mount package with integrated heatsink capability via exposed AGND pad. Pin count: 36, with dedicated ground, power, signal, and diagnostic terminals.

Pin/Terminal	Circuit Role	Design Meaning
OUT1	H-bridge output 1	High-side PMOS + low-side NMOS output node; connects directly to one side of inductive/resistive load.
OUT2	H-bridge output 2	Complementary output node; enables bidirectional current flow when paired with OUT1.
/ABE	Bidirectional enable / fault indicator	Open-drain output pulled low on VDD over/under-voltage; also accepts external low signal to disable all outputs.
DIS	Disable input	Hardware-controlled tristate command: pulls both OUT1/OUT2 into high-impedance state independent of SPI or PWM.
PWM	Pulse-width modulation input	Direct hardware control of output switching; configurable via SPI to operate in PWM or DIR mode.
DIR	Direction control input	Determines current polarity across OUT1/OUT2; function enabled only when SPI configures DIR-mode operation.
CF	Current feedback output	Analog current source proportional to load current; requires external resistor to generate voltage for ADC monitoring.
SCK, SS, SI, SO	SPI interface signals	Full-duplex serial interface for configuration, status readback, and diagnostic register access (DIA_REG1/DIA_REG2).
VDD	Logic supply	5 V ±10% supply for internal logic, monitoring, and SPI interface; monitored for brownout/overvoltage events.
VS	Power stage supply	Main battery input (5–28 V); powers H-bridge transistors; requires external reverse-polarity protection diode.
PGND, AGND, GNDABE	Ground references	Separate power (PGND), analog/device (AGND), and VDD-sense (GNDABE) grounds minimize noise coupling and improve monitoring accuracy.

Key Features

Feature	Design Value
SPI-configurable current limit	Three discrete thresholds (5 A / 6.8 A / 8.6 A) selected in real time without hardware change - enables one BOM for multiple actuator variants.
Dual independent enable inputs	/ABE (fault-aware) and DIS (fast hardware disable) provide layered safety: /ABE responds to internal faults; DIS allows immediate system-level shutdown.
Integrated current feedback (CF)	Linear current-proportional output eliminates need for external shunt + op-amp, reducing PCB area and component count in closed-loop motor control.
Full diagnosis register set	DIA_REG1 and DIA_REG2 store real-time fault flags (OL, SCB, SCG, SCL, OT) plus error history - simplifies ECU-level diagnostics and ISO 26262 ASIL-B compliance.
Smart H-bridge switching	Controlled dead-time and slew-rate management minimizes EMI during commutation - meets improved automotive EMC requirements without added filtering.

Applications

Throttle Actuator Control

EGR Valve Actuation

Use Scenario: Precise angular positioning of engine throttle plate using 12 V DC motor under varying intake manifold pressure.

IC Role / Device Role / Timing Role: H-bridge driver providing bidirectional torque control, current-limited startup, and real-time load monitoring via CF output.

Use Value: Eliminates need for external current sense amplifier and discrete protection ICs while supporting ASIL-B diagnostic coverage per ISO 26262.

Use Scenario: Duty-cycle-controlled linear motion of EGR valve plunger in diesel engines to regulate NO_x emissions.

IC Role / Device Role / Timing Role: High-reliability power stage with thermal derating and short-circuit recovery, controlled via PWM from engine ECU.

Use Value: Enables robust operation across wide temperature range (−40°C to 150°C ambient) with built-in open-load detection for valve position verification.

Fuel Injector Driver (Resistive Load)

Stepper Motor Microstepping (Dual Channel Use)

Use Scenario: Driving high-current solenoid-type fuel injectors requiring fast turn-on/turn-off and peak current limiting.

IC Role / Device Role / Timing Role: Single-channel H-bridge delivering >3 A pulsed current with programmable 8.6 A limit and <1 µs disable response via /ABE.

Use Value: Reduces injector coil stress through controlled freewheeling and eliminates external flyback diodes via integrated body diodes.

Use Scenario: Driving unipolar stepper motor coils in automotive HVAC damper modules using two independent L9959 channels (e.g., L9959T or parallel L9959U units).

IC Role / Device Role / Timing Role: Dual H-bridge implementation enabling half-step or microstep sequencing with synchronized current feedback per phase.

Use Value: Achieves smooth low-speed operation with <11 kHz PWM resolution and thermal derating that maintains torque consistency across ambient temperature swings.

Equivalent & Alternatives

The following parts are listed as comparable options for similar H-bridge driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
VNQ7E100AJTR	Single-channel high-side driver (not full H-bridge); no DIR/PWM hardware interface; current limit fixed at 10 A.	Lacks bidirectional control and integrated diagnosis registers; suitable only for unidirectional solenoid loads.	Select when only high-side switching is required and SPI configurability is unnecessary.
BD3573FV-M	Two-channel H-bridge in HTSSOP-28; lower R_DS(on) (300 mΩ), but no CF output or SPI interface; analog current sense only.	No embedded diagnostics or error history; requires external MCU for fault interpretation and lacks ASIL-ready register mapping.	Choose for cost-sensitive non-automotive applications where full diagnostic traceability is not mandated.

Compared with VNQ7E100AJTR and BD3573FV-M, the L9959U-TR-D uniquely combines full H-bridge functionality, SPI-based configurability, current feedback, and automotive-grade diagnostics - making it the only option among the three qualified for ASIL-B throttle and EGR control systems.

Availability

L9959U-TR-D is available at Aetrix Electronics and suitable for automotive EGR valve control, throttle actuation, fuel injector driving, and HVAC stepper motor applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualification.

Supply support for L9959U-TR-D 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 broad portfolio of AEC-Q100-qualified products and functional safety certifications.

The L9959U belongs to ST's L99 family of intelligent power drivers, engineered specifically for automotive body electronics and powertrain actuators requiring high reliability, integrated protection, and diagnostic readiness.

FAQ

What is the maximum continuous output current rating for L9959U-TR-D?

The L9959U-TR-D supports continuous load current >3 A under typical thermal conditions (T_A = 25°C, PCB copper area ≥ 10 cm²). Actual current capability scales with board layout and ambient temperature, with built-in temperature-dependent current reduction starting at 150°C junction temperature per Table 19 in the datasheet.

Does L9959U-TR-D require external freewheeling diodes?

No. The L9959U-TR-D integrates body diodes in both high-side PMOS and low-side NMOS transistors, enabling inherent freewheeling paths during inductive load commutation. External diodes are unnecessary unless specific reverse-recovery or voltage-clamping requirements exceed internal diode specs.

How does the /ABE pin differ from the DIS pin in fault response?

/ABE is an open-drain bidirectional pin that both reports internal VDD faults (pulled low on over/under-voltage) and accepts external disable commands; DIS is a dedicated input that forces immediate tristate on both outputs regardless of SPI state or fault condition - providing independent hardware-level shutdown.

Can L9959U-TR-D drive a bipolar stepper motor directly?

Yes - as a single H-bridge, the L9959U-TR-D controls one winding pair. For full bipolar stepper control, two L9959U devices (or one L9959T) are required, with coordinated DIR/PWM signals and shared SPI bus for synchronized current limiting and diagnostics across both channels.

L9959U-TR-D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 36-PowerFSOP (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Half Bridge (2)

Applications:: General Purpose

Interface:: SPI

Load Type:: Inductive, Capacitive, Resistive

Technology:: PMOS

Rds On (Typ):: -

Current - Output / Channel:: 3A

Current - Peak Output:: -

Voltage - Supply:: 4.5V ~ 5.5V

Voltage - Load:: 5V ~ 28V

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Features:: -

Fault Protection:: Over Temperature, Short Circuit

Mounting Type:: Surface Mount

Supplier Device Package:: PowerSSO-36 EPD

L9959U-TR-D FAQ

1.How can I place an order for L9959U-TR-D through Aetrix?

Please submit a Request for Quotation (RFQ) for L9959U-TR-D 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 L9959U-TR-D reliable?

The price and inventory of L9959U-TR-D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9959U-TR-D is usually 5 days.

3.What payment methods are accepted for L9959U-TR-D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9959U-TR-D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9959U-TR-D?

L9959U-TR-D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9959U-TR-D 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 L9959U-TR-D?

For technical support, including L9959U-TR-D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9959U-TR-D requirements.

6.How does Aetrix verify that L9959U-TR-D is sourced from the original manufacturer or authorized distributors?

All L9959U-TR-D 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 L9959U-TR-D meets industry standards.

7.What is the process for return or replacement of L9959U-TR-D?

All L9959U-TR-D units undergo pre-shipment inspection (PSI). If there is an issue with L9959U-TR-D, 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 L9959U-TR-D part is unused and in its original packaging.

Return procedure for L9959U-TR-D:

1.Submit a request within 90 days.

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

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