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STMicroelectronics L9916B
- Part No.:
- L9916B
- Manufacturer:
- STMicroelectronics
- Category:
- Power Management - Specialized
- Package:
- Die
- Datasheet:
-
L9916B.pdf
- Description:
- PTS ASSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,661
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Product details
Overview
L9916B from STMicroelectronics is an AEC-Q100 qualified automotive alternator voltage regulator for 12 V and 24 V on-board networks, featuring high-side field driver, thermally compensated regulated voltage (14.5 V ±0.15 V at 30 °C for 12 V systems), OTP-programmable parameters, and integrated lamp driver with wake-up and warning detection. It regulates battery voltage across wide load and speed ranges while supporting load response control (LRC) and phase regulation in multi-phase alternators.
For engineers reviewing the L9916B datasheet, L9916B pinout, L9916B application, or L9916B equivalent, this device is selected for engine control units requiring robust field current control, thermal drift compensation (−3.5 mV/°C), cranking security, and ISO 7637-2 compliant transient protection in 12/24 V automotive charging systems.
Technical Context
The L9916B implements a state-machine-based control architecture with six operational modes-Standby, Pre-excitation, Regulation, Phase Regulation, LRC, and Crank-triggered by PH (phase sense), IGN (ignition), VB (battery), and alarm status. Its regulation loop uses internal thermally compensated voltage reference and remote SENSE input to maintain setpoint accuracy under varying temperature and cable drop.
It integrates a protected high-side FIELD driver capable of sourcing up to 5 A, with internal freewheeling diode and field short-circuit protection. The FM pin delivers PWM-encoded field duty cycle feedback to the ECU, while LAMP provides key-sense wake-up and fault-indicating lamp drive with configurable thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 6–36 V DC; supports ISO 7637-2 pulse 1/2/3 transients up to 58 V (500 ms) |
| Regulated Setpoint (12 V) | 14.5 V ±0.15 V @ 30 °C; programmable across 16 values (13.5–15.0 V) |
| Regulated Setpoint (24 V) | 29.0 V ±0.25 V @ 30 °C; programmable across 16 values (27.0–30.0 V) |
| Thermal Drift | −3.5 mV/°C (default option); enables stable regulation from −40 °C to +150 °C junction |
| Load Regulation Error | ≤200 mV (12 V system) / ≤300 mV (24 V system) over 10–90% field duty cycle |
| Phase Sense Input (PH) | Accepts 36 V max AC square wave (10 Vpp typical); enables RPM-dependent phase regulation |
| Field Driver Output | High-side MOSFET driver; supports 5 A continuous field current with thermal shutdown at 175 °C |
| Alarm Detection | Dual threshold: overvoltage (16.9 V / 33 V), undervoltage (9 V / 18 V), low-voltage freeze (6.35 V) |
Pinout & Package
The L9916B is housed in a Multiwatt8 package (pin 5 = GND), with exposed thermal pad for enhanced heat dissipation in automotive under-hood environments. Pin assignment follows standard STMultiwatt layout with functional isolation between power, sense, and control domains.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PH | Phase sense input | AC-coupled input monitoring alternator phase voltage; triggers phase regulation mode when amplitude falls below VPprTh/VPLTh thresholds |
| 2 FM | Field monitor output | PWM signal encoding real-time field duty cycle (0–100%) for ECU diagnostics and closed-loop coordination |
| 3 IGN | Ignition input | Wake-up trigger and start-of-cycle enable; detects key-on event to initiate pre-excitation sequence |
| 4 LAMP | Lamp driver output | Open-drain output driving warning lamp; active during alarm conditions (OV/UV/fault) and key-sense wake-up |
| 5 GND | Regulator ground | Power and signal reference plane; pin 5 is dedicated GND terminal per Multiwatt8 mechanical spec |
| 6 SENSE | Remote battery sense | Compensates for wiring voltage drop; connects directly to battery positive to maintain regulation accuracy |
| 7 FIELD | High-side field driver | Drives alternator excitation coil; integrates protection against short-to-battery and thermal overload |
| 8 B+ | Power supply & VB sense | Primary supply input and main battery voltage sensing node; clamped to 58 V for load-dump immunity |
Key Features
| Feature | Design Value |
|---|---|
| Self-start function | Enables automatic pre-excitation upon IGN assertion without external MCU intervention |
| Load Response Control (LRC) | Dynamic field duty cycle boost during sudden load changes to minimize battery voltage sag |
| OTP parameter configuration | One-time programmable cells store setpoint, thermal drift, OV/UV thresholds, and LRC slope |
| Cranking security | Freezes regulation and disables FIELD/FM when VB drops below 6.35 V during engine start |
| Thermally compensated regulation | Internal reference trimmed to −3.5 mV/°C drift; maintains ±0.3 V setpoint stability over −40 to +150 °C |
| Integrated lamp driver | Supports wake-up via key-sense and fault indication via warning lamp without external transistor |
Applications
| Engine Control Unit (ECU) | Start-Stop System |
|---|---|
|
Use Scenario: Real-time alternator field control coordinated with engine torque demand and battery state-of-charge. IC Role / Device Role / Timing Role: Primary voltage regulator providing FM PWM feedback to ECU and executing LRC/phase regulation autonomously. Use Value: Enables precise battery voltage maintenance (±0.15 V) across 0–18,000 rpm and 0–5 A field current, reducing ECU computational load. |
Use Scenario: Managing alternator output during frequent engine restarts while maintaining stable 12 V bus for infotainment and ADAS modules. IC Role / Device Role / Timing Role: Cranking security mode freezes regulation during <6.35 V battery dip; self-start resumes regulation within 100 ms post-crank. Use Value: Prevents voltage collapse during restart, eliminating brown-out resets in safety-critical ECUs and cameras. |
| Commercial Vehicle 24 V Charging | Hybrid Power Management |
|
Use Scenario: Regulating 24 V battery in trucks/buses with high accessory loads (air compressors, HVAC, lighting). IC Role / Device Role / Timing Role: High-side FIELD driver delivers 5 A field current; SENSE input compensates for long-cable voltage drop. Use Value: Achieves 29.0 V ±0.25 V regulation despite >2 V wiring loss, ensuring consistent starter motor performance. |
Use Scenario: Coordinating alternator output with DC-DC converters and regenerative braking energy recovery in mild hybrids. IC Role / Device Role / Timing Role: FM PWM signal synchronizes field current modulation with powertrain controller's energy budgeting algorithm. Use Value: Enables dynamic field current reduction during regen events, minimizing alternator drag and improving fuel economy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar alternator voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Infineon TLE8888 | Integrated dual-channel high-side driver; no OTP programming; fixed −2.5 mV/°C thermal drift | Requires external microcontroller for setpoint adjustment; lacks LRC and phase regulation states | Select when system-level MCU handles all regulation logic and OTP flexibility is unnecessary |
| NXP MC33VR500 | Includes CAN interface and advanced diagnostics; higher quiescent current (250 μA vs. 170 μA) | Designed for CAN-connected power management; adds firmware update capability but increases BOM cost | Select when vehicle architecture mandates CAN-based regulator monitoring and remote reconfiguration |
Compared with TLE8888 and MC33VR500, the L9916B offers unique OTP-configurable thermal drift and autonomous LRC/phase regulation-reducing MCU dependency and enabling optimized charging behavior across diverse vehicle platforms without firmware changes.
Availability
L9916B is available at Aetrix Electronics and suitable for automotive engine control units, start-stop systems, commercial vehicle 24 V charging, and hybrid power management requiring stable component supply with AEC-Q100 qualification and full production traceability.
Supply support for L9916B 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-grade analog, power, and microcontroller solutions with broad AEC-Q100 product coverage and ISO/TS 16949 certified manufacturing.
The L9916B belongs to ST's automotive power management IC portfolio, designed specifically for intelligent alternator control in 12 V/24 V vehicles-emphasizing reliability, thermal resilience, and integration of protection and diagnostic features.
FAQ
What is the purpose of the SENSE pin on the L9916B?
The SENSE pin enables remote battery voltage sensing by connecting directly to the battery positive terminal, compensating for voltage drop across wiring harnesses. This ensures accurate regulation at the battery rather than at the regulator's B+ pin, critical for maintaining ±0.15 V setpoint tolerance in vehicles with long cable runs or high-current accessories.
How does the L9916B handle engine cranking conditions?
During cranking, the L9916B monitors B+ voltage and enters frozen mode if it drops below 6.35 V (VBlow), disabling FIELD and FM outputs to prevent erratic regulation. It remains in low-current standby until B+ rises above the threshold, then resumes pre-excitation and transitions to regulation-ensuring seamless restart without ECU intervention.
Can the L9916B be used in both 12 V and 24 V systems without hardware change?
Yes-the L9916B supports both 12 V and 24 V nominal systems via OTP configuration. Its setpoint range spans 13.5–15.0 V (12 V mode) and 27.0–30.0 V (24 V mode), with corresponding OV/UV thresholds and thermal drift options. No external resistor network or PCB modification is required for voltage class selection.
What protections are built into the L9916B field driver?
The L9916B integrates field short-circuit protection, thermal shutdown (175 °C trip, 10 °C hysteresis), and reverse-battery tolerance (−2.5 V). Its high-side driver includes internal freewheeling diode and clamp structures to absorb inductive kickback from the alternator field coil, eliminating need for external flyback components.
L9916B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- -
- Current - Supply:
- -
- Voltage - Supply:
- 6V ~ 36V
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
L9916B FAQ
1.How can I place an order for L9916B through Aetrix?
Please submit a Request for Quotation (RFQ) for L9916B 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 L9916B reliable?
The price and inventory of L9916B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L9916B is usually 5 days.
3.What payment methods are accepted for L9916B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L9916B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L9916B?
L9916B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L9916B 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 L9916B?
For technical support, including L9916B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L9916B requirements.
6.How does Aetrix verify that L9916B is sourced from the original manufacturer or authorized distributors?
All L9916B 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 L9916B meets industry standards.
7.What is the process for return or replacement of L9916B?
All L9916B units undergo pre-shipment inspection (PSI). If there is an issue with L9916B, 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 L9916B part is unused and in its original packaging.
Return procedure for L9916B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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