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STMicroelectronics LM2931BV50
- Part No.:
- LM2931BV50
- Manufacturer:
- STMicroelectronics
- Package:
- TO-220-3
- Datasheet:
-
LM2931BV50.pdf
- Description:
- IC REG LINEAR 5V 100MA TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,109
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Product details
Overview
LM2931BV50 from STMicroelectronics is a fixed 5.0 V, very low-dropout linear regulator with inhibit control, designed for automotive and industrial local power regulation. It delivers up to 100 mA output current, features 90 mV typical dropout at 10 mA, 2.5 mA quiescent current at full load, and integrated protection against load dump (60 V transient), reverse battery (–50 V), and thermal/overcurrent faults.
For engineers reviewing the LM2931BV50 datasheet, LM2931BV50 pinout, LM2931BV50 application, or LM2931BV50 equivalent, key selection criteria include its AEC-Q100 qualification (DPAK), SO-8 compatibility with L78L footprint, shutdown logic interface, and stable operation across –40 °C to 125 °C junction temperature.
Technical Context
The LM2931BV50 employs a PNP pass transistor architecture enabling ultra-low dropout voltage-critical for maintaining regulation in battery-powered systems near end-of-discharge. Its internal inhibit logic (active-low enable) allows precise system-level power sequencing and standby mode control in multi-rail automotive ECUs.
Robust transient protection is implemented via integrated clamp circuitry that automatically shuts down during 60 V load dump events or –50 V reverse-polarity transients, safeguarding both the regulator and downstream loads without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | Fixed 5.0 V ±2.5% over –40 °C to 125 °C and 5–100 mA load ensures stable MCU/peripheral supply in harsh environments. |
| Dropout voltage | 90 mV typ. at 10 mA; 250–600 mV max at 100 mA enables regulation from as low as 5.25 V input in battery-depleted conditions. |
| Quiescent current | 2.5 mA typ. at 100 mA load; 0.3–1 µA in OFF mode reduces parasitic drain during vehicle sleep states. |
| Input voltage range | 6–26 V DC operating range; withstands 60 V transient (100 ms) and –50 V reverse transient per AEC-Q100. |
| Output noise | 500 µVRMS (10 Hz–100 kHz) supports noise-sensitive analog sensors and RF modules without added filtering. |
| Thermal shutdown | Internally activated above 160 °C junction temperature; auto-recovery after cooldown prevents latch-up in overheating scenarios. |
| Supply rejection | 55–75 dB at 120 Hz ensures immunity to alternator ripple and switching converter coupling in 12 V systems. |
Pinout & Package
LM2931BV50 is available in SO-8 package (ECOPACK® compliant), pin-compatible with legacy L78L series. Pin 1 = VOUT, Pin 2 = GND, Pin 3 = VIN, Pin 4 = INH (inhibit control), Pins 5–8 = GND (multiple ground connections for low-impedance return path).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOUT) | Regulated output terminal | Delivers stable 5.0 V; requires 100 µF output capacitor for stability per datasheet Figure 3. |
| 2 (GND) | Ground reference | Primary signal ground; connects to PCB ground plane to minimize noise coupling into feedback path. |
| 3 (VIN) | Unregulated input supply | Accepts 6–26 V DC; transient clamping activates above 60 V to protect internal circuitry. |
| 4 (INH) | Inhibit control input | Active-low logic: <1.2 V enables regulator; >3.25 V disables output and reduces IQ to ≤1 µA. |
| 5–8 (GND) | Additional ground terminals | Low-inductance parallel grounding improves thermal dissipation and PSRR performance in high-noise environments. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Validated for automotive applications (DPAK variant); meets stress test requirements for temperature, humidity, and vibration. |
| Load dump protection | Withstands 60 V transients (<100 ms) without external TVS, eliminating need for discrete clamp diodes in ECU designs. |
| Reverse polarity protection | Operates safely under –50 V reverse-battery conditions, preventing damage during jump-start or service errors. |
| Thermal & current limiting | Internal foldback current limit and thermal shutdown prevent destruction during short-circuit or overload events. |
| SO-8 footprint compatibility | Direct drop-in replacement for L78L50 in existing layouts, enabling upgrade to lower dropout and enhanced protection. |
Applications
| Body Control Module (BCM) | Infotainment Power Rail |
|---|---|
|
Use Scenario: Local 5 V supply for microcontrollers, CAN transceivers, and door-lock actuators in 12 V vehicle architectures. IC Role / Device Role / Timing Role: Primary low-noise LDO providing regulated power to safety-critical digital subsystems with fast transient response. Use Value: Maintains regulation during cold-crank (down to 6 V input) and rejects alternator ripple (≥55 dB), ensuring deterministic MCU operation. |
Use Scenario: Standby power domain for display controllers and audio codecs requiring zero-power sleep mode. IC Role / Device Role / Timing Role: Inhibit-controlled LDO enabling software-initiated power gating of infotainment sub-systems. Use Value: Reduces quiescent current to ≤1 µA in OFF mode, meeting ISO 16750-2 sleep current limits (<100 µA total ECU). |
| ADAS Camera Module | Industrial Sensor Node |
|
Use Scenario: Powering image sensor and ISP in rear-view camera exposed to under-hood temperature extremes. IC Role / Device Role / Timing Role: High-PSRR, low-noise local regulator delivering clean 5 V to analog front-end and pixel clock circuits. Use Value: 500 µVRMS output noise and –40 °C to 125 °C operation prevent image artifacts and thermal shutdown during thermal cycling. |
Use Scenario: Remote condition-monitoring node powered by Li-SOCl₂ battery with 10+ year shelf life requirement. IC Role / Device Role / Timing Role: Ultra-low-IQ LDO supplying 5 V to low-power MCU and wireless transceiver during periodic wake-up bursts. Use Value: 2.5 mA quiescent current at full load extends battery life while supporting 100 mA peak sensor actuation pulses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2931CD50 | Same core regulator but no inhibit pin; TO-92 package only; lacks SO-8 footprint and shutdown logic. | Suitable for cost-sensitive, non-sequenced power rails where board space permits through-hole mounting. | Select when inhibit control and surface-mount compatibility are unnecessary and thermal budget allows TO-92 RthJA = 200 °C/W. |
| TLV73350PDBVR | Lower IQ (50 µA typ.), smaller SOT-23-5 package, but rated only to 6 V input and lacks automotive transients protection. | Applicable in consumer IoT nodes-not automotive or industrial 12 V systems requiring load dump immunity. | Choose only for low-voltage, low-power portable devices; avoid in any design requiring AEC-Q100 or >6 V input operation. |
Compared with LM2931CD50, LM2931BV50 adds critical inhibit functionality and SO-8 compatibility for modern automotive PCBs; versus TLV73350PDBVR, it trades higher quiescent current for essential 60 V transient tolerance and AEC-Q100 compliance in harsh environments.
Availability
LM2931BV50 is available at Aetrix Electronics and suitable for automotive body electronics, ADAS camera modules, and industrial sensor nodes requiring stable component supply with automotive-grade reliability and long-term lifecycle support.
Supply support for LM2931BV50 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 vertical manufacturing and AEC-Q100 validation capabilities.
The LM2931 series belongs to ST's automotive-qualified linear regulator product line, engineered specifically for robust local power delivery in 12 V vehicle networks with stringent transient and thermal requirements.
FAQ
What is the maximum allowable input voltage for continuous operation?
The LM2931BV50 has a maximum continuous operating input voltage of 26 V DC, as specified in Table 3 of DS1760 Rev 24. Exceeding this value risks permanent damage unless limited by external circuitry; however, the device tolerates 60 V transients for up to 100 ms without failure due to internal clamping.
Does the INH pin require a pull-down resistor for default-enable operation?
No external pull-down is required: the INH pin is internally pulled down to enable the regulator by default. When left unconnected or tied to GND, the device operates normally; applying ≥3.25 V to INH disables output and reduces quiescent current to ≤1 µA.
Can LM2931BV50 replace LM78L05 in an existing SO-8 design?
Yes-LM2931BV50 uses the same SO-8 pinout (VOUT-GND-VIN-INH-GND-GND-GND-GND) and footprint as LM78L05, but with INH replacing the NC pin. To retain full functionality, connect INH to GND; for new designs, leverage INH for power sequencing.
What output capacitor value is required for stability?
A minimum 100 µF aluminum or tantalum output capacitor is required for stability per Figure 3 in DS1760 Rev 24. Ceramic capacitors may be used only if ≥100 µF and paired with 1 Ω series resistor to meet ESR requirements; instability occurs below 100 µF or with ESR < 0.1 Ω.
LM2931BV50 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 30 mA
- PSRR:
- 75dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
LM2931BV50 FAQ
1.How can I place an order for LM2931BV50 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2931BV50 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 LM2931BV50 reliable?
The price and inventory of LM2931BV50 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2931BV50 is usually 5 days.
3.What payment methods are accepted for LM2931BV50?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2931BV50 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2931BV50?
LM2931BV50 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2931BV50 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 LM2931BV50?
For technical support, including LM2931BV50 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2931BV50 requirements.
6.How does Aetrix verify that LM2931BV50 is sourced from the original manufacturer or authorized distributors?
All LM2931BV50 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 LM2931BV50 meets industry standards.
7.What is the process for return or replacement of LM2931BV50?
All LM2931BV50 units undergo pre-shipment inspection (PSI). If there is an issue with LM2931BV50, 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 LM2931BV50 part is unused and in its original packaging.
Return procedure for LM2931BV50:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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