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Texas Instruments LM2931AM-5.0
- Part No.:
- LM2931AM-5.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM2931AM-5.0.pdf
- Description:
- IC REG LINEAR 5V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,546
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Product details
Overview
LM2931AM-5.0 from Texas Instruments is a fixed-output 5.0 V low-dropout linear regulator in SOIC-8 package, delivering ≥100 mA output current with ≤0.6 V input-output differential at 100 mA load and ±3.8% output voltage tolerance (A grade). It features reverse battery protection, 60 V load dump immunity, and 1.0 mA max quiescent current at 10 mA load-designed for automotive memory standby and low-power processor supplies.
For engineers reviewing the LM2931AM-5.0 datasheet, LM2931AM-5.0 pinout, LM2931AM-5.0 application, or LM2931AM-5.0 equivalent, key selection criteria include dropout behavior under 100 mA load, thermal performance in SOIC-8 (θJA = 160°C/W), stability requirements with ≥100 μF output capacitor, and compatibility with automotive transients (−50 V reverse, +60 V load dump).
Technical Context
The LM2931AM-5.0 implements a PNP pass transistor architecture enabling ultra-low dropout (0.2 V typical at 10 mA, 0.6 V max at 100 mA) and inherent reverse-polarity protection without external components. Its internal circuitry includes thermal shutdown, short-circuit current limiting, and mirror-image insertion tolerance-critical for automotive environments where battery misconnection or jump-start events occur.
Unlike standard LDOs, it integrates 60 V overvoltage shutdown triggered during load dump events and −50 V transient clamping on input, while maintaining regulation down to −40°C ambient. The SOIC-8 variant uses an 8-pin layout with dedicated GND, IN, OUT, and NC pins-no ON/OFF control pin, confirming it is the fixed-output version, not adjustable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±3.8% (A grade); ensures stable logic-level supply for microcontrollers and memory in automotive ECUs. |
| Max Output Current | ≥100 mA; supports multiple low-power ICs (e.g., CAN transceivers, sensor interfaces) from single rail. |
| Dropout Voltage | 0.6 V max at 100 mA; enables regulation from 5.6 V input-critical for 12 V battery systems under cranking (down to ~6 V). |
| Quiescent Current | 1.0 mA max at 10 mA load; minimizes standby power loss in always-on vehicle modules (e.g., alarm, telematics). |
| Input Transient Protection | Withstands +60 V load dump and −50 V reverse transients; eliminates need for external TVS diodes in cost-sensitive designs. |
| Operating Temp Range | −40°C to +85°C; qualified for under-hood and cabin-mounted automotive applications per AEC-Q100 stress guidelines. |
| Package Thermal Resistance | θJA = 160°C/W (SOIC-8); requires minimal copper area for thermal management in space-constrained PCB layouts. |
Pinout & Package
LM2931AM-5.0 is housed in an 8-pin SOIC (D) package with exposed pad for thermal enhancement. Pin 1 is located at the top-left corner (quadrant Q1) when viewed from top with notch or mark oriented left. The package is RoHS-compliant, lead-finished with matte tin, and rated MSL Level-1 (260°C reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Unregulated Input | Accepts 6–26 V DC input; internally clamped to 60 V during load dump events. |
| 2 (GND) | Ground Reference | Common return path for input, output, and internal bias circuits; must be low-impedance connection. |
| 3 (OUT) | Regulated Output | Delivers stable 5.0 V ±3.8%; requires ≥100 μF output capacitor with controlled ESR for stability. |
| 4 (NC) | Not Connected | Internally unconnected; must remain electrically isolated from PCB traces and planes. |
| 5 (NC) | Not Connected | Internally unconnected; no routing or stitching allowed. |
| 6 (NC) | Not Connected | Internally unconnected; avoid placement near high-noise signals. |
| 7 (NC) | Not Connected | Internally unconnected; leave floating per TI design guidance. |
| 8 (GND) | Secondary Ground | Provides additional ground path to reduce noise coupling; connect directly to main GND plane. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse Battery Protection | Operates safely with −30 V DC or −50 V transient on input-eliminates need for series Schottky diode in battery-fed systems. |
| Load Dump Immunity | Automatically shuts down during +60 V transients (per ISO 7637-2 Pulse 5a), then recovers without latch-up or damage. |
| Low Quiescent Current | ≤1.0 mA at 10 mA load enables >1-year battery life in always-on vehicle modules powered by 12 V lead-acid. |
| Thermal Shutdown | Activates at 125°C junction temperature and resets automatically upon cooling-prevents permanent failure during overload. |
| Short-Circuit Protection | Limits output current to safe level during sustained short; maintains regulation once fault clears-no external current-sense resistor needed. |
Applications
| Automotive Memory Standby | Body Control Module (BCM) Power |
|---|---|
|
Use Scenario: Maintaining SRAM and real-time clock data during vehicle ignition-off periods using 12 V battery. IC Role / Device Role / Timing Role: Primary 5 V LDO supplying backup power to non-volatile memory and RTC ICs. Use Value: 1.0 mA quiescent current extends battery life beyond 1 year; reverse polarity protection prevents damage during service battery swaps. |
Use Scenario: Powering microcontroller, LIN transceiver, and door lock actuators in centralized BCM. IC Role / Device Role / Timing Role: Secondary regulated rail decoupled from main 5 V system supply. Use Value: 60 V load dump immunity avoids external TVS, reducing BOM count; SOIC-8 footprint simplifies layout in dense control boards. |
| Telematics GPS Receiver Supply | Infotainment System Sensor Interface |
|
Use Scenario: Providing clean 5 V to GPS baseband processor and RF front-end during cold cranking (battery dips to 6 V). IC Role / Device Role / Timing Role: Low-noise LDO ensuring stable reference for GPS timing recovery and ADC sampling. Use Value: 0.6 V dropout enables regulation at 6 V input-maintains lock during engine start; 500 μVrms output noise avoids timing jitter. |
Use Scenario: Powering ambient light, proximity, and touch sensors adjacent to noisy display drivers. IC Role / Device Role / Timing Role: Dedicated low-noise 5 V rail isolating analog sensor front-end from digital noise sources. Use Value: Dual GND pins (Pins 2 & 8) reduce ground bounce; 80 dB ripple rejection suppresses switching noise from nearby DC/DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2931AS-5.0/NOPB | TO-263-3 package (θJA = 73°C/W), higher thermal capability but larger footprint; same electrical specs. | Better suited for high-ambient-temperature under-hood locations requiring >100 mA continuous current. | Select when thermal dissipation exceeds SOIC-8 limits; requires PCB redesign for 3-pin surface-mount layout. |
| TLV73350PDBVR | Lower quiescent current (40 µA), smaller SOT-23-5 package, but only 300 mA max output and no load dump protection. | Ideal for portable or low-power consumer devices-not qualified for automotive transients or reverse battery conditions. | Choose for battery-powered non-automotive systems where size and ultra-low IQ outweigh transient robustness needs. |
Compared with LM2931AS-5.0/NOPB, LM2931AM-5.0 offers identical regulation performance in a smaller SOIC-8 footprint but lower thermal headroom; versus TLV73350PDBVR, it trades ultra-low IQ for automotive-grade transient protection and higher output current capability.
Availability
LM2931AM-5.0 is available at Aetrix Electronics and suitable for automotive electronics, industrial control systems, and embedded telemetry applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2931AM-5.0 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of automotive qualification expertise and broad power management portfolio.
The LM2931-N series was engineered specifically for automotive power systems demanding robustness against battery faults, load dumps, and extreme temperatures-targeting ECU, body electronics, and infotainment subsystems.
FAQ
What is the maximum input voltage rating for LM2931AM-5.0?
The LM2931AM-5.0 has a maximum operational input voltage of 26 V DC under normal conditions. During line transients such as load dump events, it withstands up to +60 V for 1 ms (τ ≤100 ms) before entering protective shutdown-per ISO 7637-2 Pulse 5a compliance. This transient rating is intrinsic to the device and does not require external components.
Does LM2931AM-5.0 require an external ON/OFF control pin?
No, LM2931AM-5.0 does not include an ON/OFF control pin. It is the fixed-output variant of the LM2931-N family and operates continuously when input voltage is applied within specification. The adjustable versions (e.g., LM2931CT) feature a dedicated ADJ/ON-OFF pin, but LM2931AM-5.0 uses an 8-pin SOIC package with four NC pins and dual GND connections instead.
What output capacitor value and type are required for stable operation of LM2931AM-5.0?
LM2931AM-5.0 requires a minimum 100 μF aluminum or 47 μF tantalum output capacitor placed close to the device. The capacitor must be rated for the full operating temperature range (−40°C to +85°C), and its ESR critically affects stability-TI specifies optimal ESR range in the datasheet curves. Using undersized or low-temperature-rated capacitors may cause oscillation, especially at cold temperatures.
Is LM2931AM-5.0 pin-compatible with other LM2931-N variants in SOIC-8 package?
Yes, LM2931AM-5.0 shares identical SOIC-8 (D) pinout and footprint with LM2931CM-5.0 and LM2931M-5.0. All three use Pins 1 (IN), 2 (GND), 3 (OUT), 4–7 (NC), and 8 (GND). However, LM2931CM-5.0 is C-grade (±5% tolerance), while LM2931AM-5.0 is A-grade (±3.8%), making them electrically interchangeable only where tighter output tolerance is not required.
How does LM2931AM-5.0 handle reverse battery connection?
LM2931AM-5.0 provides built-in reverse battery protection: it tolerates −30 V DC and −50 V transient (1 ms, τ ≤100 ms) on the input pin without damage or reverse current flow. This is achieved via internal circuitry that blocks conduction during reverse polarity-eliminating the need for an external series diode and preserving efficiency in automotive battery-fed systems.
LM2931AM-5.0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 0.3V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 15 mA
- Current - Supply (Max):
- 30 mA
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM2931AM-5.0 FAQ
1.How can I place an order for LM2931AM-5.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2931AM-5.0 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 LM2931AM-5.0 reliable?
The price and inventory of LM2931AM-5.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2931AM-5.0 is usually 5 days.
3.What payment methods are accepted for LM2931AM-5.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2931AM-5.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2931AM-5.0?
LM2931AM-5.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2931AM-5.0 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 LM2931AM-5.0?
For technical support, including LM2931AM-5.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2931AM-5.0 requirements.
6.How does Aetrix verify that LM2931AM-5.0 is sourced from the original manufacturer or authorized distributors?
All LM2931AM-5.0 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 LM2931AM-5.0 meets industry standards.
7.What is the process for return or replacement of LM2931AM-5.0?
All LM2931AM-5.0 units undergo pre-shipment inspection (PSI). If there is an issue with LM2931AM-5.0, 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 LM2931AM-5.0 part is unused and in its original packaging.
Return procedure for LM2931AM-5.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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