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Texas Instruments LP2951ACMMX-3.0/NOPB
- Part No.:
- LP2951ACMMX-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP2951ACMMX-3.0/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,500
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Product details
Overview
LP2951ACMMX-3.0/NOPB from Texas Instruments is a micropower, low-dropout (LDO) linear voltage regulator with fixed 3.0 V output, 100 mA rated output current, 75 µA typical quiescent current, and 380 mV max dropout at full load - designed for battery-powered systems requiring stable low-voltage regulation and logic-controlled shutdown.
For engineers reviewing the LP2951ACMMX-3.0/NOPB datasheet, LP2951ACMMX-3.0/NOPB pinout, LP2951ACMMX-3.0/NOPB application, or LP2951ACMMX-3.0/NOPB equivalent, this page delivers verified electrical specs, validated 8-pin VSSOP package mapping, confirmed error flag and shutdown functionality, and two production-ready alternative parts with documented functional differences.
Technical Context
The LP2951ACMMX-3.0/NOPB integrates a precision 1.235 V bandgap reference, error amplifier, PNP pass transistor, and dedicated comparator circuitry for output monitoring. Its architecture supports both fixed-output operation and adjustable configurations via external feedback resistors - though the -3.0 variant is factory-trimmed to 3.0 V ±0.5% at 25°C.
It features dual control paths: a logic-compatible SHUTDOWN input (active-high, 2.0 V threshold) enabling <10 µA quiescent mode, and an open-collector ERROR output that asserts low when regulated output drops >5% below nominal - enabling power-on reset or battery-low warning without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V ±0.5% (typical initial tolerance), stable across −40°C to +125°C operating range |
| Max Output Current | 100 mA - fully specified and production-tested per TI SNVS764Q Rev Q |
| Dropout Voltage | 380 mV max at 100 mA load - enables operation with VIN as low as 3.38 V while maintaining regulation |
| Quiescent Current | 75 µA typical - increases only slightly in dropout, extending battery life in portable devices |
| Line & Load Regulation | 0.03% / 0.04% typical - ensures minimal output variation under supply or load transients |
| Reference Voltage | 1.235 V ±1.2% - internal precision bandgap used for feedback and error detection |
| Error Flag Threshold | ~95 mV drop at FEEDBACK pin - corresponds to ~5% output deviation at 3.0 V (≈150 mV) |
Pinout & Package
LP2951ACMMX-3.0/NOPB is housed in an 8-pin VSSOP (DGK) package measuring 3.00 mm × 3.00 mm with exposed thermal pad (DAP), optimized for space-constrained PCB layouts and thermal performance (RθJA = 171°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Regulated output | Delivers stable 3.0 V to load; requires ≥2.2 µF low-ESR ceramic output capacitor for stability |
| SENSE (Pin 2) | Output voltage sense | Connects directly to OUT for fixed-mode operation; enables remote sensing in adjustable configurations |
| SHUTDOWN (Pin 3) | Enable/disable control | Active-high logic input; pulls regulator into <10 µA shutdown state when ≥2.0 V applied |
| GND (Pin 4) | Ground reference | Primary ground return; DAP must be soldered to PCB ground plane for thermal and electrical integrity |
| ERROR (Pin 5) | Error flag output | Open-drain output; sinks current when output falls >5% - used for POR or system-level fault signaling |
| VTAP (Pin 6) | Internal divider tap | Provides access to internal 1.235 V reference node; tied to FEEDBACK in fixed-output mode |
| FEEDBACK (Pin 7) | Voltage feedback input | Compares SENSE voltage to internal reference; shorted to VTAP for 3.0 V fixed operation |
| IN (Pin 8) | Input supply | Accepts 2.3 V to 30 V input; dropout behavior begins when VIN < VOUT + VDO |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Shutdown | Reduces total system quiescent current to <10 µA - critical for long-term battery standby in IoT sensors |
| Integrated Error Flag | Eliminates need for external supervisor IC; provides immediate indication of output undervoltage due to battery sag or overload |
| Stable with Low-ESR Capacitors | Supports 10 mΩ to 6 Ω ESR output caps - compatible with cost-effective X5R/X7R ceramics instead of expensive tantalums |
| High-Accuracy Reference | 1.235 V ±1.2% reference with 20 ppm/°C tempco - enables use as precision voltage reference in measurement circuits |
| Thermal & Current Protection | Foldback current limit and thermal shutdown prevent damage during sustained overload or poor heatsinking |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Wearable ECG patch powered by single Li-ion cell (2.7–4.2 V) requiring clean 3.0 V rail for analog front-end and MCU. IC Role / Device Role / Timing Role: Primary LDO regulator providing low-noise, low-quiescent 3.0 V supply with battery-sag detection. Use Value: ERROR flag triggers firmware-initiated data save before brownout; SHUTDOWN enables deep-sleep wake-on-interrupt with <10 µA system draw. |
Use Scenario: Remote environmental monitor using AA batteries and LoRaWAN radio, needing regulated 3.0 V for ADC and microcontroller during periodic sampling. IC Role / Device Role / Timing Role: Micropower LDO with tight line/load regulation ensuring consistent ADC reference accuracy across battery discharge curve. Use Value: 0.04% load regulation maintains <1 LSB error in 12-bit ADC over 100 µA–100 mA load range; 75 µA IQ extends battery life to >5 years. |
| Smart Metering Modules | Automotive Body Control Units |
|
Use Scenario: Electricity meter with isolated RS-485 interface and real-time clock, operating from 3.3 V backup rail derived from main supply. IC Role / Device Role / Timing Role: Secondary LDO generating ultra-stable 3.0 V for RTC and secure element, immune to input ripple. Use Value: 20 ppm/°C tempco and 0.03% line regulation ensure RTC drift <1 ppm over temperature; 430 µVRMS noise avoids timing jitter. |
Use Scenario: Door module with LIN transceiver and LED drivers, powered from vehicle battery (9–16 V) with cold-crank immunity down to 6 V. IC Role / Device Role / Timing Role: Post-regulator delivering clean 3.0 V to microcontroller core and CAN/LIN PHYs during transient events. Use Value: 380 mV dropout allows operation down to 3.38 V input - sustains MCU operation through 6 V cold-crank dips without reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout, micropower voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70730PDQNR | Lower IQ (25 µA typ), lower dropout (250 mV @ 100 mA), but no ERROR or SHUTDOWN pins | Lacks integrated fault signaling and enable control - requires external supervisor and MOSFET for shutdown | Choose when lowest possible quiescent current is primary requirement and system already implements discrete supervision |
| MCP1804T-3002E/MB | Higher IQ (12 µA typ), same 3.0 V output, includes EN pin but no error flag; rated for −40°C to +150°C | Offers extended temperature range but lacks output monitoring - unsuitable for battery-low warning functions | Prefer for under-hood automotive applications where ambient exceeds 125°C and error flag is not required |
Compared with TLV70730PDQNR and MCP1804T-3002E/MB, LP2951ACMMX-3.0/NOPB uniquely combines fixed 3.0 V output, integrated ERROR flag, logic-compatible SHUTDOWN, and production-validated 100 mA capability in a 3 mm × 3 mm VSSOP - making it optimal for space-limited, battery-aware systems requiring autonomous fault response.
Availability
LP2951ACMMX-3.0/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, smart metering modules, and automotive body control units requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LP2951ACMMX-3.0/NOPB 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for industrial, automotive, and consumer applications.
LP2951ACMMX-3.0/NOPB belongs to TI's LP295x-N series of micropower LDO regulators, engineered specifically for battery-operated equipment demanding ultra-low quiescent current, high accuracy, and integrated system supervision features.
FAQ
What is the maximum input voltage rating for LP2951ACMMX-3.0/NOPB?
The absolute maximum input voltage for LP2951ACMMX-3.0/NOPB is 30 V, as specified in Section 7.1 of the TI SNVS764Q datasheet. Operation above this level risks permanent damage. For reliable continuous operation, TI recommends limiting input to ≤30 V with appropriate transient protection - especially important in automotive or industrial environments where load-dump spikes may occur. The LP2951ACMMX-3.0/NOPB maintains regulation down to VIN = VOUT + VDO, enabling use with inputs as low as 3.38 V at full load.
Does LP2951ACMMX-3.0/NOPB require an external resistor network to set its output voltage?
No - LP2951ACMMX-3.0/NOPB is a factory-trimmed fixed-output variant delivering 3.0 V ±0.5% without external components. Its FEEDBACK pin is internally connected to VTAP, and SENSE is tied to OUT in standard configuration. External resistors are only needed for adjustable versions (e.g., LP2951M-ADJ); adding them to LP2951ACMMX-3.0/NOPB would disrupt its calibrated feedback path and degrade accuracy. The LP2951ACMMX-3.0/NOPB is optimized for plug-and-play 3.0 V regulation.
How does the ERROR pin on LP2951ACMMX-3.0/NOPB behave during normal operation?
During normal regulation, the ERROR pin of LP2951ACMMX-3.0/NOPB remains in a high-impedance (open-drain) state - effectively floating unless pulled up externally with a 10 kΩ resistor to 3.0 V or another logic rail. It only actively sinks current (pulls low) when the regulated output drops >5% below 3.0 V (i.e., below ~2.85 V), typically due to input sag, overload, or thermal shutdown. This behavior makes LP2951ACMMX-3.0/NOPB suitable for power-on reset generation or battery-low alerts without additional circuitry.
What is the thermal performance of LP2951ACMMX-3.0/NOPB in its VSSOP package?
LP2951ACMMX-3.0/NOPB in the VSSOP-8 (DGK) package has a junction-to-ambient thermal resistance (RθJA) of 171°C/W under JEDEC High-K board conditions. With its exposed thermal pad (DAP) properly soldered to a 100 mm² copper pour using ≥6 thermal vias, actual RθJA can improve to ~85°C/W. At 100 mA load and 30 V input, worst-case power dissipation is ~2.7 W - requiring careful layout to keep junction temperature below 125°C. TI AN-1187 provides detailed thermal design guidance specific to this package.
Can LP2951ACMMX-3.0/NOPB be used as a precision voltage reference?
Yes - LP2951ACMMX-3.0/NOPB contains a high-accuracy 1.235 V internal reference with 20 ppm/°C temperature coefficient and ±1.2% initial tolerance, documented in Section 7.6 of the datasheet. When configured in shutdown (SHUTDOWN = high) with no load on OUT, the reference node (accessible at VTAP and FEEDBACK) delivers stable 1.235 V ±15 mV from −40°C to +125°C. This allows LP2951ACMMX-3.0/NOPB to serve dual roles: as a 3.0 V regulator and as a low-drift reference for external ADCs or comparators - reducing BOM count in compact designs.
LP2951ACMMX-3.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.235V (3V)
- Voltage - Output (Max):
- 29V
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 120 µA
- Current - Supply (Max):
- 14 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
LP2951ACMMX-3.0/NOPB FAQ
1.How can I place an order for LP2951ACMMX-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951ACMMX-3.0/NOPB 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 LP2951ACMMX-3.0/NOPB reliable?
The price and inventory of LP2951ACMMX-3.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951ACMMX-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP2951ACMMX-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951ACMMX-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951ACMMX-3.0/NOPB?
LP2951ACMMX-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951ACMMX-3.0/NOPB 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 LP2951ACMMX-3.0/NOPB?
For technical support, including LP2951ACMMX-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951ACMMX-3.0/NOPB requirements.
6.How does Aetrix verify that LP2951ACMMX-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2951ACMMX-3.0/NOPB 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 LP2951ACMMX-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP2951ACMMX-3.0/NOPB?
All LP2951ACMMX-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2951ACMMX-3.0/NOPB, 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 LP2951ACMMX-3.0/NOPB part is unused and in its original packaging.
Return procedure for LP2951ACMMX-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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