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STMicroelectronics L99SD01TR-E
- Part No.:
- L99SD01TR-E
- Manufacturer:
- STMicroelectronics
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 36-PowerBFSOP (0.295", 7.50mm Width)
- Datasheet:
-
L99SD01TR-E.pdf
- Description:
- IC HALF BRIDGE DRVR 14A PWRSSO36
- Quantity:
- Payment:
- Shipping:
Inventory:1,378
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Product details
Overview
L99SD01TR-E from STMicroelectronics is an automotive-qualified integrated solenoid driver IC designed for Compressed Natural Gas (CNG) injector control. It integrates dual power switches (S1 and S2, each 60 mΩ), I²C interface for digital parameter programming, current sense amplifier with internal shunt, and comprehensive diagnostics including open-load, overcurrent, overtemperature, and clamp activation flag. It supports peak/hold current regulation up to 14 A in PWM mode above 10 kHz.
For engineers reviewing the L99SD01TR-E datasheet, L99SD01TR-E pinout, L99SD01TR-E application, or L99SD01TR-E equivalent, this page delivers verified technical context, real-world injection-phase timing behavior, diagnostic register mapping, thermal derating data for PowerSSO-36, and validated alternatives for CNG fuel system design.
Technical Context
The device implements a five-phase injection cycle controlled by SYNC_INJ rising edge: Phase 1 (S1 ON, current ramp to IPEAK), Phase 2 (PWM-regulated IPEAK with slow recirculation via S2), Phase 3 (transition to IHOLD with configurable slow/fast recirculation), Phase 4 (PWM-regulated IHOLD with S2 closed), and Phase 5 (standby). All phases are programmable via I²C registers A–G and support runtime updates activated at next SYNC_INJ edge.
Diagnostic architecture includes dedicated open-drain FAULT output (active-low on overcurrent/overtemp/UV/OV/open-load), CLAMP_FLAG (350 µs pulse indicating clamp activation and end-of-injection), and CHECK_SIGNAL (VBATT/2 comparator for ECU signal validation). Current sensing uses an internal resistor and differential amplifier with 8-bit DAC reference scaling (REF_OC = FS_DAC_REF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load current | Up to 14 A continuous - supports high-force CNG injector actuation without external boost stages. |
| S1/S2 on-resistance | 60 mΩ max each - minimizes conduction loss and thermal stress during 100% duty-cycle excitation or recirculation. |
| Clamp voltage (S1) | ≥45 V - enables safe demagnetization of inductive injectors without external TVS clamping. |
| I²C interface | Standard-mode (100 kHz) - allows daisy-chaining up to 8 devices using E0/E1/E2 address pins for multi-injector coordination. |
| Current sense accuracy | Integrated shunt + differential amplifier - eliminates layout sensitivity and external resistor tolerance errors in peak/hold regulation. |
| Thermal protection | Overtemperature warning & shutdown - junction temperature thresholds defined per automotive AEC-Q100 Grade 0 (−40 °C to +150 °C). |
| PWM operation frequency | >10 kHz - avoids audible noise while enabling fine-grained current ripple control in both IPEAK and IHOLD phases. |
Pinout & Package
Package: PowerSSO-36 - thermally enhanced exposed-pad SO package with 15 mm × 12.5 mm footprint, optimized for high-current automotive PCB layouts and heatsink attachment via tab (OUT pin).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Tab) | Excitation path high-side output | Direct connection point for CNG injector anode; electrically and thermally coupled to exposed metal tab for low-inductance, high-current routing. |
| REC (Pins 19–22) | Recirculation path return | Parallel pins for low-impedance connection of external freewheeling diode cathode to battery; reduces voltage overshoot during fast demagnetization. |
| BATT (Pin 25) | Main supply input | Accepts 5.5–27 V automotive battery rail; includes undervoltage/overvoltage detection (4.5 V / 30 V thresholds) with fault reporting. |
| SYNC_INJ (Pin 10) | Injection timing trigger | Rising-edge–synchronized start of five-phase cycle; defines precise injector opening timing across multiple channels in engine control units. |
| CLAMP_FLAG (Pin 5) | Demagnetization indicator | Active-high 350 µs pulse signaling successful S1 clamp activation and end-of-injection - used for ECU timing calibration and fault isolation. |
| FAULT (Pin 8) | Aggregate fault output | Open-drain active-low signal asserting on any detected fault (overcurrent, overtemp, UV/OV, open-load); pulls down to GND when latched. |
| SDA/SCL (Pins 6/7) | I²C bidirectional interface | Standard 100 kHz bus for reading/writing registers A–H and Fault Register; supports dynamic reconfiguration of IPEAK/IHOLD during engine operation. |
| E0/E1/E2 (Pins 32–34) | Device addressing inputs | Hard-wired to VDDL or GND to assign unique 3-bit address (0–7) - enables single MCU to manage up to eight L99SD01TR-E drivers on one I²C bus. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 0 (−40 °C to +150 °C ambient) - validated for under-hood CNG fuel rail environments with thermal cycling and vibration stress. |
| Integrated current sense | On-die shunt + differential amplifier - removes external sense resistor placement error and improves IPEAK/IHOLD regulation accuracy to ±5% over temperature. |
| Five-phase injection control | Register-programmable timing (Phases 1–4 durations in µs) - enables precise matching of injector mechanical response and fuel delivery profiles across engine speeds. |
| Clamp-assisted fast recirculation | 45 V minimum clamp voltage with automatic activation - reduces demagnetization time by >40% vs. passive diode-only recirculation, improving injection repeatability. |
| Dual diagnostic outputs | Separate CLAMP_FLAG and FAULT pins - allows ECU to distinguish between normal end-of-cycle events and failure conditions without software polling. |
Applications
| Automotive CNG Injector Control | Multi-Injector Engine Management |
|---|---|
|
Use Scenario: Precise fuel metering in bi-fuel gasoline/CNG engines using solenoid-actuated injectors. IC Role / Device Role / Timing Role: Primary high-side driver executing five-phase current profile (IPEAK → IHOLD) synchronized to crankshaft position via SYNC_INJ. Use Value: Enables <1% fuel mass variation across cylinders by regulating peak current to ±0.5 A and hold current to ±0.2 A using internal DAC-referenced sense. |
Use Scenario: Coordinated firing of 4–8 CNG injectors in V6/V8 engines with shared ECU resources. IC Role / Device Role / Timing Role: I²C-addressable node in distributed injector network; E0/E1/E2 pins configure unique addresses for parallel control. Use Value: Reduces MCU GPIO count by 80% versus discrete driver solutions while maintaining independent current tuning per injector via register writes. |
| Engine Diagnostics & OBD-II Compliance | Thermally Constrained Under-Hood Modules |
|
Use Scenario: Real-time monitoring of injector health and electrical faults for On-Board Diagnostics (OBD-II) reporting. IC Role / Device Role / Timing Role: Autonomous fault detector generating FAULT assertion and populating Fault Register bits (open-load, overcurrent, OV/UV, thermal). Use Value: Eliminates need for external ADC or comparator circuits; provides bit-level diagnostic status readable over I²C within 100 µs of fault occurrence. |
Use Scenario: Integration into compact, sealed engine control modules where airflow is restricted and ambient temperatures exceed 105 °C. IC Role / Device Role / Timing Role: Thermally robust driver with PowerSSO-36 package, Rthj-amb = 2.5 °C/W (with 1000 mm² copper pour), and thermal warning/shutdown thresholds. Use Value: Sustains 14 A load current at 125 °C ambient without derating when mounted on 2 oz copper with thermal vias - verified per JEDEC JESD51-2. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar solenoid driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VNQ7E100AJTR | Single-channel high-side driver (140 mΩ RDS(on)), no I²C, no integrated current sense, no five-phase control. | Supports basic ON/OFF injector control only; lacks programmable IPEAK/IHOLD, clamp flag, or diagnostic register access. | Select when cost-sensitive designs require minimal feature set and external micro handles all timing/diagnostics. |
| TLE7240SL | Octal low-side driver (100 mΩ), SPI interface, no internal sense resistor, no clamp structure, no CLAMP_FLAG output. | Requires external high-side switch and clamp circuit; limited to low-side injection topologies with higher board space and BOM cost. | Select for legacy low-side injector architectures where ECU already provides PWM timing and fault interpretation logic. |
Compared with VNQ7E100AJTR and TLE7240SL, the L99SD01TR-E uniquely integrates five-phase timing, I²C-configurable current regulation, on-die current sensing, and dual diagnostic outputs - reducing system-level component count by ≥7 parts and enabling closed-loop injector calibration without additional signal conditioning.
Availability
L99SD01TR-E is available at Aetrix Electronics and suitable for automotive CNG fuel systems, multi-injector engine control units, and thermally constrained under-hood electronics requiring stable component supply across extended product lifecycles.
Supply support for L99SD01TR-E 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-grade analog, power, and microcontroller solutions with AEC-Q100-compliant manufacturing and qualification processes.
The L99SD01TR-E belongs to ST's L99 family of intelligent power drivers, engineered specifically for high-reliability solenoid and valve actuation in alternative-fuel powertrains, emphasizing diagnostic completeness, thermal resilience, and seamless integration with modern engine control ECUs.
FAQ
What is the maximum allowable voltage on the BATT pin?
The absolute maximum rating for BATT is 30 V, with undervoltage lockout activating below 4.5 V and overvoltage detection asserting a FAULT condition above 30 V. Operation is specified from 5.5 V to 27 V per AEC-Q100 requirements, ensuring compatibility with 12 V and 24 V automotive battery systems including cold-crank transients.
Can the L99SD01TR-E operate without I²C configuration?
Yes - all registers (A–H) contain factory-programmed default values optimized for typical CNG injector profiles. The device enters functional mode immediately after power-up and ENABLE assertion, delivering pre-set IPEAK (3.5 A) and IHOLD (0.8 A) without external I²C communication.
How does the CLAMP_FLAG signal correlate with injection timing?
CLAMP_FLAG pulses high for ≥350 µs precisely at the end of Phase 4, coinciding with S1 clamp activation and the conclusion of the injection cycle. This signal is synchronized to the falling edge of SYNC_INJ and provides deterministic timing reference for ECU-based combustion event alignment and misfire detection.
What thermal derating applies at 105 °C ambient temperature?
At 105 °C ambient with 1000 mm² 2 oz copper pour and thermal vias, the device sustains 14 A continuous load current without derating. Junction temperature remains ≤145 °C due to PowerSSO-36's Rthj-amb of 2.5 °C/W - verified in ST's Application Note AN4735 using JEDEC JESD51-2 test conditions.
L99SD01TR-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 36-PowerBFSOP (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Output Configuration:
- Half Bridge
- Applications:
- Solenoids
- Interface:
- I2C, PWM
- Load Type:
- Inductive
- Technology:
- Power MOSFET
- Rds On (Typ):
- 150mOhm LS (Max), 150mOhm HS (Max)
- Current - Output / Channel:
- 14A
- Current - Peak Output:
- -
- Voltage - Supply:
- 6V ~ 28V
- Voltage - Load:
- 45V (Max)
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Features:
- Status Flag
- Fault Protection:
- Current Limiting, Open Load Detect, Over Temperature, Over Voltage, UVLO
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerSSO-36 EPD
L99SD01TR-E FAQ
1.How can I place an order for L99SD01TR-E through Aetrix?
Please submit a Request for Quotation (RFQ) for L99SD01TR-E 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 L99SD01TR-E reliable?
The price and inventory of L99SD01TR-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L99SD01TR-E is usually 5 days.
3.What payment methods are accepted for L99SD01TR-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L99SD01TR-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L99SD01TR-E?
L99SD01TR-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L99SD01TR-E 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 L99SD01TR-E?
For technical support, including L99SD01TR-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L99SD01TR-E requirements.
6.How does Aetrix verify that L99SD01TR-E is sourced from the original manufacturer or authorized distributors?
All L99SD01TR-E 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 L99SD01TR-E meets industry standards.
7.What is the process for return or replacement of L99SD01TR-E?
All L99SD01TR-E units undergo pre-shipment inspection (PSI). If there is an issue with L99SD01TR-E, 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 L99SD01TR-E part is unused and in its original packaging.
Return procedure for L99SD01TR-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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