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Texas Instruments LMV431ACM5-TI
- Part No.:
- LMV431ACM5-TI
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431ACM5-TI.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:76,279
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Product details
Overview
LMV431ACM5-TI from Texas Instruments is a precision adjustable shunt regulator with 1.24V reference voltage, 1% initial tolerance (25°C), and operation up to 30V cathode voltage. It functions as a low-voltage zener replacement in feedback loops of DC-DC converters, voltage monitors, and low-dropout regulators-enabling stable 2.7V output from 3V input rails.
For engineers reviewing the LMV431ACM5-TI datasheet, LMV431ACM5-TI pinout, LMV431ACM5-TI application, or LMV431ACM5-TI equivalent, key selection criteria include reference voltage accuracy over temperature, dynamic output impedance, minimum regulation current, capacitive load stability range, and SOT-23-5 thermal performance for compact power management designs.
Technical Context
The LMV431ACM5-TI implements a band-gap reference core with non-inverting op-amp-like feedback control: cathode voltage is regulated via external resistor divider connected to the adjust pin. Its internal architecture supports stable operation with capacitive loads between 10nF and 50pF-unlike standard zeners requiring resistive loading.
It operates across 0°C to +70°C commercial temperature range, draws only 55µA typical quiescent current, and maintains 0.25Ω dynamic output impedance (rZ) at 0.1–15mA cathode current-critical for tight regulation in error amplifier and crowbar circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C; enables precise voltage setting from 1.24V to 30V using two external resistors |
| Initial Tolerance | ±1% at TA = 25°C (LMV431AC grade); tighter than standard zeners for improved system accuracy |
| Cathode Voltage Range | 1.24 V to 30 V; supports wide-range output adjustment without external biasing |
| Dynamic Output Impedance | 0.25 Ω typical; ensures minimal output voltage shift under load transients in shunt regulator configurations |
| Minimum Cathode Current | 55 µA typical; allows regulation at ultra-low power levels, e.g., battery-backed monitoring |
| Reference Input Current | 0.15–0.5 µA; reduces divider resistor power loss and improves high-impedance sensing accuracy |
| Operating Temperature | 0°C to +70°C (Commercial); validated for consumer and industrial embedded power supplies |
Pinout & Package
SOT-23-5 plastic package (NS Package Number MF05A), 5-pin surface-mount device with exposed pad thermal enhancement; footprint compatible with standard SOT-23-5 PCB land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Regulated output node | Connected to supply rail being monitored/regulated; sinks current to maintain set voltage |
| Anode (Pin 2) | Ground reference | Internal connection to substrate ground; must be tied to system GND for proper operation |
| Adjust (Pin 3) | Feedback input | High-impedance reference input; connects to resistor divider midpoint for voltage programming |
| NC (Pin 4) | No internal connection | Not bonded; left unconnected or tied to GND per layout best practices |
| NC (Pin 5) | No internal connection | Not bonded; left unconnected or tied to GND per layout best practices |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage reference | 1.24V band-gap reference enables regulation below 2V-impossible with standard 3.3V+ zeners |
| Capacitive load stability | Stable with 10nF–50pF capacitive loads-supports direct connection to switching regulator feedback nodes without oscillation |
| Ultra-low quiescent current | 55µA typical operating current minimizes standby power in always-on voltage monitors |
| Low dynamic impedance | 0.25Ω rZ ensures <1mV output shift per 1mA load change-critical for precision error amplifiers |
| Wide cathode voltage range | 30V max cathode voltage allows use in 24V industrial systems without series dropping resistors |
Applications
| 3V Off-Line Switching Regulator | Low Dropout N-Channel Series Regulator |
|---|---|
Use Scenario: Feedback voltage sensing in primary-side controlled AC/DC flyback converters operating from 3V input. IC Role / Device Role / Timing Role: Precision shunt reference providing accurate error signal to PWM controller. Use Value: Enables ±1% output regulation across line/load/temperature using only two external resistors and no optocoupler. | Use Scenario: Generating stable 2.7V rail from 3V supply in portable instrumentation with tight headroom. IC Role / Device Role / Timing Role: Adjustable shunt element controlling gate voltage of external N-channel MOSFET. Use Value: Achieves 300mV dropout at 100mA while maintaining 1.24V reference accuracy-reducing heat vs. linear regulators. |
| Voltage Monitor | Crowbar Circuit |
Use Scenario: Undervoltage lockout (UVLO) detection for microcontroller reset assertion at 2.5V threshold. IC Role / Device Role / Timing Role: Threshold comparator with hysteresis implemented via resistor network on adjust pin. Use Value: Provides 12mV max reference deviation over 0°C–70°C-ensuring reliable reset timing without calibration. | Use Scenario: Overvoltage protection triggering SCR gate drive when 5V rail exceeds 5.2V. IC Role / Device Role / Timing Role: Precision voltage threshold detector activating crowbar switch during fault conditions. Use Value: Delivers sub-100µs response to overvoltage events due to fast turn-on and low output impedance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 1.24V reference, ±0.5% initial tolerance, SOT-23-5, 1.24–18V cathode range | Limited to 18V max cathode voltage vs. 30V for LMV431ACM5-TI | Select for higher accuracy where 18V cathode limit is acceptable |
| AS431ARTDT-33 | 1.24V reference, ±1% tolerance, SOT-23-5, 36V cathode rating, 80µA min cathode current | Higher IZ(MIN) increases minimum load requirement in low-power designs | Select for extended cathode voltage margin beyond 30V |
Compared with TLVH431ACDBVR and AS431ARTDT-33, the LMV431ACM5-TI offers optimal balance of 30V cathode capability, 1% accuracy, and 55µA regulation threshold-making it preferred for 3V–24V industrial power supplies requiring robust, low-cost voltage supervision.
Availability
LMV431ACM5-TI is available at Aetrix Electronics and suitable for 3V off-line switching regulators, low-dropout series regulators, voltage monitors, crowbar protection circuits, and error amplifier feedback loops requiring stable component supply across production volumes.
Supply support for LMV431ACM5-TI 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 acquired National Semiconductor in 2011 and now manufactures, tests, and supports all legacy National analog products including the LMV431 family.
The LMV431 product line was designed for cost-sensitive, space-constrained power management applications requiring precision shunt regulation below 30V-targeting consumer, industrial, and computing power supplies.
FAQ
What is the reference voltage tolerance of LMV431ACM5-TI over temperature?
The LMV431ACM5-TI has ±1% initial tolerance at 25°C and exhibits ≤12 mV total reference voltage deviation across its full 0°C to +70°C operating range. This corresponds to ±0.97% maximum drift relative to nominal 1.24V, verified per LMV431AC Electrical Characteristics table in TI's official datasheet DS100958. The LMV431ACM5-TI achieves this via proprietary band-gap compensation optimized for commercial-temperature applications.
Can LMV431ACM5-TI replace a standard zener diode in existing designs?
Yes, the LMV431ACM5-TI can directly replace zener diodes in most shunt regulator applications, but requires two external resistors to set output voltage and proper grounding of Pin 2 (Anode). Unlike zeners, it delivers 1.24V reference accuracy, 0.25Ω dynamic impedance, and stable operation with capacitive loads-eliminating need for damping resistors. Designers must verify that the LMV431ACM5-TI's 55µA minimum cathode current and SOT-23-5 thermal limits meet the original zener's operating conditions.
What is the maximum capacitive load the LMV431ACM5-TI supports without oscillation?
The LMV431ACM5-TI is characterized for stable operation with capacitive loads between 10nF and 50pF, as confirmed in the "Typical Applications" and "Stability Boundary Condition" sections of the official datasheet. Loads outside this range may cause ringing or oscillation in feedback loops. For larger bulk capacitance, a series isolation resistor (e.g., 10Ω) between the LMV431ACM5-TI cathode and capacitor is recommended. This behavior is intrinsic to the LMV431ACM5-TI's internal transconductance and compensation design.
Does LMV431ACM5-TI require an external bypass capacitor on the adjust pin?
No, the LMV431ACM5-TI does not require an external bypass capacitor on the adjust pin. Its adjust pin presents high input impedance (0.15–0.5µA input current) and is designed for direct connection to a resistor divider. Adding capacitance here would degrade transient response and potentially destabilize regulation. Stability is maintained by controlling the total capacitance at the cathode node per the 10nF–50pF specification-not at the adjust pin. This simplifies layout versus op-amp-based references requiring adjust-pin filtering.
How does the LMV431ACM5-TI perform as an error amplifier in a switching regulator?
The LMV431ACM5-TI serves as a high-accuracy, low-drift error amplifier by comparing a scaled-down output voltage against its 1.24V internal reference. With 0.25Ω dynamic output impedance and 55µA minimum cathode current, it delivers fast, precise feedback to the PWM controller-enabling ±1% output regulation across line, load, and temperature. Its 55µA IZ(MIN) and 0.5µA reference input current minimize divider losses, making the LMV431ACM5-TI especially effective in high-efficiency, low-quiescent-current DC-DC designs.
LMV431ACM5-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 30 V
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 39ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMV431ACM5-TI FAQ
1.How can I place an order for LMV431ACM5-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431ACM5-TI 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 LMV431ACM5-TI reliable?
The price and inventory of LMV431ACM5-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431ACM5-TI is usually 5 days.
3.What payment methods are accepted for LMV431ACM5-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431ACM5-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431ACM5-TI?
LMV431ACM5-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431ACM5-TI 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 LMV431ACM5-TI?
For technical support, including LMV431ACM5-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431ACM5-TI requirements.
6.How does Aetrix verify that LMV431ACM5-TI is sourced from the original manufacturer or authorized distributors?
All LMV431ACM5-TI 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 LMV431ACM5-TI meets industry standards.
7.What is the process for return or replacement of LMV431ACM5-TI?
All LMV431ACM5-TI units undergo pre-shipment inspection (PSI). If there is an issue with LMV431ACM5-TI, 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 LMV431ACM5-TI part is unused and in its original packaging.
Return procedure for LMV431ACM5-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431ACM5-TI Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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