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

STMicroelectronics L9959S-TR-D

Name: L9959S-TR-D
Brand: STMicroelectronics
SKU: L9959S-TR-D
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9959S-TR-D

Manufacturer:: STMicroelectronics

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

Package:: 24-PowerBSOP (0.295", 7.50mm Width)

Datasheet:: L9959S-TR-D.pdf

Description:: IC HALF BRIDGE DRVR 3A PWRSSO-24

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Product details

Overview

L9959S-TR-D from STMicroelectronics is a single-channel PMOS high-side H-bridge driver IC designed for automotive resistive and inductive loads, featuring full-path R_DS(on) < 540 mΩ, continuous load current > 3 A, and dual enable control (/ABE and DIS). It operates from 5 V to 28 V battery supply and integrates SPI-configurable current limiting (5–8.6 A), real-time current feedback (CF), and comprehensive diagnostics for throttle actuators and EGR valves.

For engineers reviewing the L9959S-TR-D datasheet, L9959S-TR-D pinout, L9959S-TR-D application, or L9959S-TR-D equivalent, this device supports PWM/DIR or SPI-only control modes, provides open-load and short-circuit detection, delivers temperature-dependent current reduction, and enables error history logging via second diagnosis register - critical for functional safety-compliant motor control designs.

Technical Context

The L9959S implements a smart H-bridge architecture with integrated high-side PMOS and low-side NMOS power stages, enabling bidirectional DC motor control with programmable switching behavior (PWM mode or DIR-change mode). Its internal VDD monitor and /ABE open-drain output provide fail-safe shutdown during supply faults.

SPI interface supports full-duplex communication (SS, SCK, SI, SO) at up to 11 kHz switching frequency, with register-mapped configuration of current limit thresholds, diagnostic enable bits, and power-on reset sources. All ECU internal pins withstand up to 18 V, and CF output delivers proportional current feedback referenced to AGND.

Key Specifications

Parameter	Value and Actual Design Meaning
R_DS(on) (full path)	< 540 mΩ: Enables low conduction loss and thermal efficiency at >3 A continuous load current.
Battery supply range	5 V to 28 V: Supports wide automotive battery voltage variation including cold-crank and load-dump conditions.
VDD supply range	4.5 V to 5.5 V: Ensures stable logic operation with standard 5 V microcontroller interfaces.
Output switching frequency	Up to 11 kHz: Allows precise PWM-based speed/torque control without audible noise in motor applications.
SPI current limit steps	5 A / 6.8 A / 8.6 A: Programmable overcurrent protection thresholds reduce system-level fuse dependency.
Current feedback (CF)	Analog current-proportional output: Enables real-time closed-loop current monitoring using external resistor.
Protection features	Over-temperature, short-circuit (SCB/SCG), open-load, and VS undervoltage: Reduces need for external fault-handling circuitry.

Pinout & Package

Package: PowerSSO24 (exposed pad), thermally enhanced surface-mount package with AGND-connected exposed pad for efficient heat dissipation in automotive under-hood environments.

Pin/Terminal	Circuit Role	Design Meaning
OUT1, OUT2	H-bridge power outputs	Drive inductive/resistive loads bidirectionally; each integrates high-side PMOS + low-side NMOS with freewheeling diodes.
/ABE	Open-drain enable/fault indicator	Pulled low on VDD over/under-voltage; also accepts external low signal to disable all outputs immediately.
DIS	Disable input	Switches OUT1/OUT2 to high-impedance state independently of /ABE, supporting flexible safety sequencing.
PWM, DIR	Logic control inputs	Configurable via SPI to accept either PWM+DIR signals or SPI-only command mode for deterministic control.
CF	Current feedback output	Delivers analog current-proportional signal (I_CF = k × I_LOAD) for closed-loop monitoring without ADC overhead.
SCK, SS, SI, SO	SPI interface	Full-duplex serial interface compliant with standard microcontroller SPI peripherals; supports daisy-chaining in multi-device systems.
VS, VDD, PGND, AGND	Power domains	Separate power rails isolate high-current power stage (VS) from logic (VDD) and ground domains (PGND/AGND) to minimize noise coupling.

Key Features

Feature	Design Value
SPI-configurable current limit	Three discrete thresholds (5 A / 6.8 A / 8.6 A) set via CONFIG_REG, eliminating hardware resistor changes during validation.
Dual independent enable control	/ABE (fault-triggered) and DIS (user-controlled) allow layered safety architecture per ISO 26262 ASIL-B requirements.
Integrated diagnosis registers	DIA_REG1 and DIA_REG2 store real-time fault flags and error history, enabling post-failure root-cause analysis without external logging.
Smart H-bridge switching	Reduces EMC emissions via controlled slew rates and optimized dead-time management in both PWM and DIR-change modes.
Temperature-dependent current reduction	Automatically scales current limit based on junction temperature (per Table 19), preventing thermal runaway without external sensor.

Applications

Throttle Actuator Control

EGR Valve Actuation

Use Scenario: Precise positioning of electronic throttle bodies in gasoline engines under varying ambient temperatures and vibration.

IC Role / Device Role / Timing Role: H-bridge driver executing bidirectional PWM-controlled motor movement with real-time current feedback for position verification.

Use Value: Integrated open-load detection confirms actuator connection integrity; SPI-diagnosis registers log intermittent faults during vehicle road testing.

Use Scenario: Closed-loop control of exhaust gas recirculation valves in diesel powertrains to meet Euro 6 emission standards.

IC Role / Device Role / Timing Role: High-reliability power stage managing inductive load transients while reporting overtemperature events via DIA_REG2.

Use Value: Temperature-dependent current reduction prevents coil overheating during extended idle operation; CF output enables current-based stall detection.

DC Motor Positioning Systems

Stepper Motor Microstepping Driver

Use Scenario: Industrial HVAC damper actuators requiring smooth start/stop motion and stall recovery in dusty environments.

IC Role / Device Role / Timing Role: Single H-bridge delivering configurable current-limited drive with fast switch-off capability on /ABE assertion.

Use Value: Short-circuit protection (SCB/SCG) avoids MOSFET destruction during connector arcing; DIS pin enables coordinated multi-axis shutdown.

Use Scenario: Automotive seat/mirror adjustment systems using unipolar stepper motors with microstepping precision.

IC Role / Device Role / Timing Role: Dual-mode controller accepting DIR/PWM inputs or SPI commands to sequence half-step/full-step sequences.

Use Value: 11 kHz max switching frequency supports fine microstep resolution; current feedback ensures torque consistency across battery voltage range.

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 logic interface; fixed 10 A current limit.	Only suitable for unidirectional loads; lacks bidirectional control and SPI diagnostics.	Select when only high-side switching is needed and diagnostic depth is secondary to cost.
L99H02XPTR	Dual H-bridge in PowerSO-36; higher R_DS(on) (800 mΩ typ); no CF output; SPI-only control (no DIR/PWM fallback).	Targeted at dual-motor applications; requires external current sensing; less flexible control interface.	Choose for space-constrained dual-actuator systems where footprint efficiency outweighs analog feedback needs.

Compared with VNQ7E100AJTR and L99H02XPTR, the L9959S-TR-D uniquely combines full H-bridge topology, analog current feedback, dual-control-mode flexibility, and automotive-grade diagnostics - making it optimal for safety-critical bidirectional actuation where functional verification and field failure analysis are mandatory.

Availability

L9959S-TR-D is available at Aetrix Electronics and suitable for automotive throttle control, EGR valve actuation, and industrial DC motor positioning systems requiring stable component supply, long-term lifecycle support, and AEC-Q100 qualified performance.

Supply support for L9959S-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 headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with broad manufacturing scale and automotive qualification expertise.

The L9959 product line targets functional-safety-aware motor control in automotive powertrain and chassis systems, emphasizing integrated diagnostics, robust EMC behavior, and seamless microcontroller interoperability via SPI and logic interfaces.

FAQ

What is the maximum continuous current rating for L9959S-TR-D?

The L9959S-TR-D supports continuous load current greater than 3 A under typical thermal conditions (T_j ≤ 150 °C, PCB copper area ≥ 200 mm²). Actual current capability depends on ambient temperature, heatsinking, and duty cycle - full derating curves are provided in Section 3.6 of the datasheet (DocID027540 Rev 3, p.20).

Does L9959S-TR-D require external freewheeling diodes?

No. The L9959S-TR-D integrates internal freewheeling diodes across both OUT1 and OUT2 power stages (Section 3.7, p.20). These diodes handle inductive kickback during switching transitions, eliminating the need for external components in standard DC motor drive configurations.

How does the /ABE pin function during normal operation?

During normal operation, /ABE remains high-impedance unless VDD falls below 4.5 V or rises above 5.5 V - then it pulls low as an open-drain fault indicator. It can also be actively driven low by external circuitry to force immediate output disable, providing a hardware-level safety interlock independent of SPI or logic inputs.

Can L9959S-TR-D drive stepper motors in bipolar configuration?

Yes. The L9959S-TR-D's full H-bridge topology supports bipolar stepper motor winding control when paired with a second identical device (e.g., L9959S-TR-D ×2) or used in conjunction with external logic to coordinate phase sequencing. Its 11 kHz switching frequency and current feedback enable microstepping with current regulation.

L9959S-TR-D Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 24-PowerBSOP (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-24

L9959S-TR-D FAQ

1.How can I place an order for L9959S-TR-D through Aetrix?

Please submit a Request for Quotation (RFQ) for L9959S-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 L9959S-TR-D reliable?

The price and inventory of L9959S-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 L9959S-TR-D is usually 5 days.

3.What payment methods are accepted for L9959S-TR-D?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9959S-TR-D transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9959S-TR-D?

L9959S-TR-D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9959S-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 L9959S-TR-D?

For technical support, including L9959S-TR-D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9959S-TR-D requirements.

6.How does Aetrix verify that L9959S-TR-D is sourced from the original manufacturer or authorized distributors?

All L9959S-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 L9959S-TR-D meets industry standards.

7.What is the process for return or replacement of L9959S-TR-D?

All L9959S-TR-D units undergo pre-shipment inspection (PSI). If there is an issue with L9959S-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 L9959S-TR-D part is unused and in its original packaging.

Return procedure for L9959S-TR-D:

1.Submit a request within 90 days.

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

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