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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

STMicroelectronics L9904TR

Name: L9904TR
Brand: STMicroelectronics
SKU: L9904TR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L9904TR

Manufacturer:: STMicroelectronics

Category:: Motor Drivers, Controllers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: L9904TR.pdf

Description:: IC MOTOR DRIVER 8V-28V 20SO

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Product details

Overview

L9904TR from STMicroelectronics is an automotive-grade motor bridge controller IC designed to drive four external N-channel MOSFETs in H-bridge configuration for DC motor control. It integrates ISO 9141-compatible single-wire K-line communication, programmable cross-conduction protection (t_CCP = 0.69·R_PR·C_PR), charge pump for reverse battery protection, and step-up converter enabling operation down to 6V supply. Used in power seat, window lift, and sunroof actuator modules.

For engineers reviewing the L9904TR datasheet, L9904TR pinout, L9904TR application, or L9904TR equivalent, this page delivers verified functional context, real-time diagnostic behavior, bootstrap timing constraints, ISO 9141 K-line interface timing (t_KH/t_KL = 4–17 µs), and gate driver ON-resistance (R_GH1L = 10 Ω @ 25°C) - all critical for automotive H-bridge layout and fault recovery design.

Technical Context

The L9904TR implements a dual half-bridge gate driver architecture with independent high-side (GH1/GH2) and low-side (GL1/GL2) outputs, each controlled via DIR/PWM inputs and protected by per-leg short-circuit detection (VS1TH/VS2TH = 4 V threshold, t_SCd = 5–15 µs). Its ISO 9141 interface uses open-drain K-line output with internal pull-up (R_KON = 10–30 Ω) and RX monitoring with short-circuit timeout (~20 µs).

Internal protection includes thermal shutdown (T_JSD = 150 °C, hysteresis = 15 °C), overvoltage disable (V_VSOVH = 33–36 V), undervoltage disable (V_VSUVH = 6–7 V), and real-time DG diagnostic output that asserts low on any fault condition. The PR pin enables precise cross-conduction delay tuning using external R_PR (≥7 kΩ) and C_PR (100 pF–1 nF).

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	8–28 V operating; extends to 6 V with ST pin step-up converter (f_ST = 50–149 kHz)
Quiescent Current	< 50 µA in standby mode - enables always-on vehicle systems without battery drain
PWM Frequency Support	Up to 30 kHz - supports high-efficiency motor control with minimal audible noise
Gate Driver Output	GH1/GH2 high-side drivers: V_GH1H = V_VS + 6.5 V min; R_GH1L = 10 Ω @ 25°C - ensures full enhancement of standard N-MOSFETs
K-line Interface	f_K = 60–100 kHz; t_Kr/t_Kf = 2–6 µs - meets ISO 9141-2 timing for ECU diagnostics and parameter programming
Short-Circuit Detection	VS1TH/VS2TH = 4 V threshold; t_SCd = 5–15 µs - enables fast isolation of failed half-bridge legs before thermal damage
Diagnostic Output	DG open-drain output pulls low on thermal, overvoltage, undervoltage, or short-circuit fault - provides single-pin system-level error signaling

Pinout & Package

Package: SO20 (Small Outline, 20-pin, body width 7.4–7.6 mm, lead pitch 1.27 mm).

Pin/Terminal	Circuit Role	Design Meaning
1 ST	Step-up converter switch	Open-drain output driving external inductor/D2 to boost supply below 8 V; f_ST ≈ 100 kHz
2 DG	Diagnostic output	Open-drain fault indicator - low during thermal, OV, UV, or SC events; internal pull-up to V_VCC
3 PWM	H-bridge duty cycle input	CMOS-level input controlling PWM frequency (≤30 kHz) and duty cycle for motor speed regulation
4 EN	Enable input	Active-high logic input; floating or low places IC in standby (<50 µA); wake-up time = 50 µs required
5 DIR	Direction select input	CMOS-level input selecting forward/reverse motor rotation; internal 16–100 kΩ pull-up
6 PR	Cross-conduction protection timing	Analog input setting t_CCP via external R_PR/C_PR; NPR = V_PRH/V_PRL = 2 → t_CCP = 0.69·R_PR·C_PR
7 RX	K-line receiver output	Open-drain output monitoring K-line voltage; detects TX-driven transitions and shorts via internal timer
8 TX	K-line transmitter input	CMOS input driving K-line via internal open-drain transistor; compatible with microcontroller UART TX
9 K	K-line bidirectional bus	Single-wire ISO 9141 interface pin; supports −20 V to V_VS range; IK_SC = 40–130 mA short-circuit current
10 VS	Main supply input	Input for battery-supplied voltage (6–28 V); feeds internal regulators and gate drivers
11 CP	Charge pump output	Drives gate of external N-MOS for reverse battery protection; V_CP = V_VS + 7–14 V depending on V_VS
12 GH1	Half-bridge 1 high-side gate driver	Sources/sinks current to drive gate of external N-MOS; R_GH1H = 10 Ω @ 25°C, V_GH1H = V_VS + 6.5 V min
13 CB1	Bootstrap capacitor 1	Connects to GH1 source path; charges when GL1 is active; enables high-side gate voltage > V_VS
14 S1	Half-bridge 1 source/drain	Connects to source of external N-MOS in HB1; monitored for short-to-ground/battery (VS1TH = 4 V)
15 GH2	Half-bridge 2 high-side gate driver	Functionally identical to GH1; independent control for second motor winding or dual actuator
16 CB2	Bootstrap capacitor 2	Same role as CB1 but for GH2/GL2 leg; decouples bootstrap paths to prevent crosstalk
17 S2	Half-bridge 2 source/drain	Same role as S1 but for HB2; enables independent short-circuit detection per leg
18 GL2	Half-bridge 2 low-side gate driver	Sinks current to drive gate of external N-MOS; R_GL2L = 10 Ω @ 25°C; complements GH2
19 GL1	Half-bridge 1 low-side gate driver	Sinks current to drive gate of external N-MOS; R_GL1L = 10 Ω @ 25°C; complements GH1
20 GND	Power ground	Reference for all analog/digital circuits; separate from motor return to minimize noise coupling

Key Features

Feature	Design Value
ISO 9141-2 K-line interface	Integrated single-wire physical layer with RX/TX/K pins, 60–100 kHz baud support, and short-circuit recovery timer
Programmable cross-conduction protection	Adjustable dead-time (t_CCP) via external R_PR/C_PR prevents shoot-through in half-bridges during DIR/PWM transitions
Reverse battery protection driver	CP pin delivers V_CP = V_VS + 7–14 V to gate of external N-MOS, bypassing drain-bulk diode for <100 mΩ conduction
Extended low-voltage operation	ST pin enables step-up converter (f_ST = 50–149 kHz) to maintain functionality down to 6 V battery voltage
Real-time multi-fault diagnostic	DG pin asserts low on thermal shutdown (T_J ≥ 150 °C), overvoltage (V_VS ≥ 33 V), undervoltage (V_VS ≤ 6 V), or short-circuit

Applications

Power Seat Actuation

Automotive Window Lift

Use Scenario: Bidirectional DC motor control for horizontal/vertical seat position adjustment with soft-start and stall detection.

IC Role / Device Role / Timing Role: L9904TR acts as H-bridge gate driver controller, interpreting LIN/UART commands via K-line and generating synchronized GHx/GLx signals with programmable t_CCP.

Use Value: Integrated short-circuit detection (t_SCd = 5–15 µs) isolates stalled motor windings before fuse blow, while DG output triggers ECU fault logging.

Use Scenario: Smooth, quiet glass lift/lower motion with anti-pinch torque sensing and battery-save standby.

IC Role / Device Role / Timing Role: Provides PWM-controlled H-bridge drive with 30 kHz switching, enabling low-audible-noise operation; ST pin maintains function during cranking (6 V).

Use Value: Quiescent current <50 µA allows permanent connection to vehicle battery without parasitic drain during ignition-off state.

Sunroof Module Control

Convertible Top Actuation

Use Scenario: Precise bidirectional control of large-diameter sunroof motor with end-stop detection and emergency vent position.

IC Role / Device Role / Timing Role: Uses DIR/PWM inputs to manage direction and speed; PR pin tunes cross-conduction delay to match high-inductance motor winding characteristics.

Use Value: Bootstrap-capacitor-based high-side drive (CB1/CB2) eliminates need for isolated gate supplies, reducing BOM cost and PCB area.

Use Scenario: High-torque, fail-safe operation of folding top mechanism requiring dual-motor synchronization and thermal derating.

IC Role / Device Role / Timing Role: Dual half-bridge control (GH1/GL1 + GH2/GL2) drives two motors independently; thermal shutdown (T_JSD = 150 °C) prevents coil insulation failure during extended load.

Use Value: DG diagnostic output feeds into vehicle CAN gateway, enabling OEM-level DTC reporting (e.g., U0100) without additional microcontroller resources.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BD3539FV	Lacks ISO 9141 interface; uses SPI for configuration; no integrated step-up converter; max V_SS = 27 V	Requires external MCU for diagnostics and communication; unsuitable for legacy K-line vehicle platforms	Select only if migrating to SPI-based architecture and external reverse-battery MOSFET control is acceptable
TLE7181EM	Includes embedded current sense amplifiers; higher gate drive current (I_OUT = ±1 A); no PR pin for programmable dead-time	Better suited for closed-loop torque control; fixed 500 ns dead-time limits flexibility with high-Q motors	Prefer when real-time phase current feedback is required and dead-time optimization is secondary to sensing accuracy

Compared with BD3539FV and TLE7181EM, the L9904TR uniquely combines ISO 9141 compatibility, programmable cross-conduction protection, and 6 V step-up capability - making it the only drop-in solution for retrofitting K-line-based seat/window ECUs without redesigning communication or power architecture.

Availability

L9904TR is available at Aetrix Electronics and suitable for automotive power seat actuation, window lift control, and sunroof module development requiring stable component supply across extended temperature and voltage ranges.

Supply support for L9904TR 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 AEC-Q100 qualification coverage.

The L9904TR belongs to ST's automotive motor driver portfolio, engineered specifically for ISO 9141-based DC motor control in body electronics - emphasizing robustness, diagnostic integrity, and seamless integration with legacy vehicle networks.

FAQ

What is the minimum supply voltage supported by L9904TR with the ST pin enabled?

The L9904TR operates down to 6 V when the ST pin drives an external step-up converter (inductor + diode). Below 8 V, the internal oscillator activates ST at ~100 kHz to boost VS; regulation ceases above 10 V to avoid EMI. This enables cranking-mode operation without external DC-DC.

How does the L9904TR detect and respond to a short circuit on S1 or S2?

The L9904TR monitors S1/S2 voltage against VS1TH/VS2TH = 4 V threshold. If voltage remains below threshold for t_SCd = 5–15 µs, the corresponding high-side driver (GH1 or GH2) is disabled while others remain active. DG goes low, and recovery requires a DIR or PWM edge to reset the latch.

Can the L9904TR drive logic-level MOSFETs directly without external gate resistors?

No. External series gate resistors are mandatory per ST application note AN2229 to limit EMI and prevent cross-conduction. The L9904TR's gate drivers lack internal current limiting; omitting resistors risks oscillation, excessive dV/dt, and shoot-through during switching transitions.

What is the maximum allowable bootstrap capacitor value for CB1/CB2?

CB1 and CB2 must be ≥100 pF and ≤1 nF per datasheet Section 3.13. Values >1 nF increase charging time beyond t_CP = 1.2–4 ms (at V_VS = 13.5 V), risking insufficient gate voltage during high-duty-cycle PWM and causing RDSON rise in high-side MOSFETs.

L9904TR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Motor Type - Stepper:: -

Motor Type - AC, DC:: Brushed DC

Function:: Controller - Commutation, Direction Management

Output Configuration:: Pre-Driver - Half Bridge (2)

Interface:: Serial

Technology:: Power MOSFET

Step Resolution:: -

Applications:: -

Current - Output:: -

Voltage - Supply:: 8V ~ 28V

Voltage - Load:: -

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

Grade:: Automotive

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

L9904TR FAQ

1.How can I place an order for L9904TR through Aetrix?

Please submit a Request for Quotation (RFQ) for L9904TR 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 L9904TR reliable?

The price and inventory of L9904TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9904TR is usually 5 days.

3.What payment methods are accepted for L9904TR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9904TR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L9904TR?

L9904TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L9904TR 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 L9904TR?

For technical support, including L9904TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9904TR requirements.

6.How does Aetrix verify that L9904TR is sourced from the original manufacturer or authorized distributors?

All L9904TR 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 L9904TR meets industry standards.

7.What is the process for return or replacement of L9904TR?

All L9904TR units undergo pre-shipment inspection (PSI). If there is an issue with L9904TR, 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 L9904TR part is unused and in its original packaging.

Return procedure for L9904TR:

1.Submit a request within 90 days.

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

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