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Texas Instruments LP2951CMMX-3.0
- Part No.:
- LP2951CMMX-3.0
- Manufacturer:
- Texas Instruments
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LP2951CMMX-3.0.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,815
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Product details
Overview
LP2951CMMX-3.0 from Texas Instruments is a micropower low-dropout (LDO) voltage regulator with fixed 3.0 V output, 100 mA guaranteed output current, 75 µA typical quiescent current, and 380 mV typical dropout at full load - designed for battery-powered systems requiring stable, low-power regulation with error flag and logic-controlled shutdown.
For engineers reviewing the LP2951CMMX-3.0 datasheet, LP2951CMMX-3.0 pinout, LP2951CMMX-3.0 application, or LP2951CMMX-3.0 equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, and validated alternative options for industrial, portable, and safety-critical power management designs.
Technical Context
The LP2951CMMX-3.0 integrates a precision 1.235 V bandgap reference, error amplifier, PNP pass transistor, and dedicated comparator circuitry enabling both regulated output and output-voltage monitoring. Its architecture supports dual operation modes: standard regulation and programmable configuration via external resistors on FEEDBACK/VTAP pins.
It features a dedicated ERROR output that asserts low when output drops >5% below nominal (≈150 mV at 3.0 V), and a SHUTDOWN input compatible with TTL/CMOS logic levels (ON <0.6 V, OFF >2.0 V). The SENSE pin enables remote sensing for improved load regulation in distributed power systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±0.5% at 25°C; maintains regulation across −40°C to +125°C junction range |
| Max Output Current | 100 mA guaranteed - sufficient for microcontrollers, sensors, and RF modules without thermal derating at ambient |
| Quiescent Current | 75 µA typical - extends battery life in always-on or sleep-mode applications |
| Dropout Voltage | 380 mV typical at 100 mA - enables operation down to VIN = 3.38 V while sustaining 3.0 V output |
| Line Regulation | 0.03% typical - ensures <1 mV output shift over 4–30 V input range, critical for variable-source systems |
| Load Regulation | 0.04% typical - holds output within ±1.2 mV from 100 µA to 100 mA load, supporting mixed-signal loads |
| Reference Voltage | 1.235 V ±1.2% - serves as accurate internal reference for feedback loop and external circuit calibration |
Pinout & Package
LP2951CMMX-3.0 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 in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Regulated output node | Delivers stable 3.0 V to load; connects directly to local bypass capacitor (2.2 µF recommended) |
| SENSE (Pin 2) | Remote output voltage sense | Enables Kelvin sensing to compensate for PCB trace IR drop - improves regulation accuracy under dynamic load |
| SHUTDOWN (Pin 3) | Logic-enable control input | Pull ≤0.6 V to disable regulator (IQ drops to ~3 µA); pull ≥2.0 V to enable - supports system-level power sequencing |
| GND (Pin 4) | Analog and power ground reference | Common return for internal circuitry; DAP must be soldered to PCB ground plane for thermal and noise integrity |
| ERROR (Pin 5) | Open-collector fault indicator | Sinks 400 µA when output falls >5% (≈150 mV); used for power-on reset, battery-low warning, or supervisor signaling |
| VTAP (Pin 6) | Internal resistor divider tap | Provides access to mid-point of internal 1.235 V reference divider - enables programmable output via external R1/R2 network |
| FEEDBACK (Pin 7) | Voltage feedback input | Connects to external resistor divider for adjustable output; tied to VTAP for fixed 3.0 V operation |
| IN (Pin 8) | Input supply connection | Accepts 2.3 V to 30 V unregulated input; requires 1 µF ceramic input capacitor near pin for stability |
Key Features
| Feature | Design Value |
|---|---|
| Error flag with hysteresis | Asserts low at 5% output dropout (≈150 mV at 3.0 V) with 15 mV hysteresis - prevents chatter during marginal input conditions |
| Logic-compatible shutdown | Consumes only 3 µA in shutdown mode; compatible with 1.8 V/3.3 V/5 V logic families without level-shifting |
| Remote voltage sensing | SENSE pin allows separation of regulation point from output pad - corrects for up to 100 mV IR drop in high-current traces |
| Stable with low-ESR capacitors | Works with 10 mΩ to 6 Ω ESR output caps - supports polymer, tantalum, and ceramic types without compensation |
| Integrated protection | Foldback current limiting and thermal shutdown prevent damage during short-circuit or overload events - no external components required |
Applications
| Battery-Powered IoT Sensor Node | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Long-life wireless sensor node powered by two AA alkaline cells (1.8–3.2 V), operating intermittently with BLE radio bursts. IC Role / Device Role / Timing Role: Primary 3.0 V LDO supplying MCU, ADC, and transceiver; provides undervoltage detection via ERROR pin for graceful shutdown. Use Value: 75 µA quiescent current extends shelf life beyond 5 years; 380 mV dropout enables usable runtime down to 3.38 V input - extracting maximum energy from aging batteries. |
Use Scenario: DIN-rail mounted PLC module with isolated 24 V DC input powering analog input circuits and digital logic rails. IC Role / Device Role / Timing Role: Local 3.0 V regulator for precision op-amps and SAR ADCs; SENSE pin compensates for voltage drop across backplane connectors. Use Value: 0.04% load regulation ensures <±1.2 mV output shift across 100 µA–100 mA load steps - preserving 16-bit ADC accuracy under varying channel count. |
| Medical Wearable Monitor | Automotive Body Control Module (BCM) |
|
Use Scenario: Skin-contact ECG patch with rechargeable Li-ion battery (3.0–4.2 V), requiring ultra-low-noise, low-power 3.0 V rail for analog front-end. IC Role / Device Role / Timing Role: Low-noise 3.0 V supply for instrumentation amplifiers and sigma-delta ADC; ERROR pin triggers firmware alert on battery depletion. Use Value: 100 µVRMS output noise (10 Hz–100 kHz) with 3.3 µF bypass eliminates need for additional filtering; 0.5% initial tolerance meets Class II medical device accuracy requirements. |
Use Scenario: 12 V automotive subsystem powering CAN transceivers and microcontroller peripherals, subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Post-regulator for 3.0 V logic supply; SHUTDOWN pin synchronized with vehicle ignition state to eliminate standby drain. Use Value: Withstands 30 V max input and −40°C to +125°C operation; 2.0 V shutdown threshold ensures reliable disable during cranking (battery dips to ~6 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar micropower LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV70730PDQNR | Lower quiescent current (25 µA), but no ERROR or SENSE pins; 200 mA rated, 250 mV dropout at 200 mA | Lacks fault reporting and remote sensing - unsuitable where battery monitoring or precision load regulation is required | Prefer for ultra-low-IQ applications without supervision needs; not drop-in due to different pinout and feature set |
| MCP1804T-3002I/OT | 3.0 V fixed, 150 mA, 12 µA IQ, but no shutdown or error flag; TO-236 package (SOT-23) | No logic control or fault indication - limited to simple, non-intelligent regulation tasks | Choose for cost-sensitive, space-constrained designs lacking system-level power management requirements |
Compared with TLV70730PDQNR and MCP1804T-3002I/OT, LP2951CMMX-3.0 uniquely combines micropower operation, integrated error detection, remote sensing, and logic shutdown in a single 8-pin VSSOP - making it the only option among the three suitable for battery-aware, high-accuracy embedded systems requiring supervisory capability.
Availability
LP2951CMMX-3.0 is available at Aetrix Electronics and suitable for battery-powered IoT nodes, industrial PLC I/O modules, medical wearables, and automotive body control units requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across temperature extremes.
Supply support for LP2951CMMX-3.0 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 expertise in precision power management ICs for industrial, automotive, and medical markets.
The LP2951 series was engineered specifically for micropower, low-dropout regulation in battery-critical systems - emphasizing ultra-low quiescent current, tight output tolerance, and integrated supervision features like ERROR flag and logic shutdown.
FAQ
What is the minimum input voltage required for LP2951CMMX-3.0 to maintain regulated 3.0 V output?
The LP2951CMMX-3.0 requires a minimum input-to-output differential of 380 mV at 100 mA load, meaning VIN must be ≥3.38 V to sustain full-rated output. At light loads (100 µA), dropout drops to 50 mV, allowing operation down to VIN = 3.05 V. Input must remain ≥2.3 V per absolute ratings - below this, regulation is not guaranteed.
How does the ERROR pin on LP2951CMMX-3.0 function, and what voltage threshold triggers it?
The ERROR pin on LP2951CMMX-3.0 is an open-collector output that pulls low when the regulated output drops >5% below nominal (i.e., <2.85 V for 3.0 V version), corresponding to ≈150 mV absolute dropout. It includes 15 mV hysteresis to prevent oscillation during marginal conditions and sinks up to 400 µA - compatible with standard logic inputs or microcontroller GPIOs.
Can LP2951CMMX-3.0 be used in programmable-output configurations, or is it strictly fixed 3.0 V?
Yes - although LP2951CMMX-3.0 is factory-configured for fixed 3.0 V output, its internal VTAP and FEEDBACK pins allow reconfiguration as an adjustable regulator from 1.24 V to 29 V using external resistors. For fixed 3.0 V use, FEEDBACK is internally tied to VTAP; for adjustment, disconnect and apply external divider per datasheet Figure 22.
What is the role of the SENSE pin on LP2951CMMX-3.0, and when should it be used?
The SENSE pin on LP2951CMMX-3.0 enables remote voltage sensing at the load rather than at the regulator output pad. It should be used when PCB trace resistance causes >10 mV IR drop between regulator and load - connecting SENSE directly to the load's ground or VCC node improves regulation accuracy by up to 10× under dynamic current changes.
Does LP2951CMMX-3.0 require specific output capacitor types or values for stability?
Yes - LP2951CMMX-3.0 is stable with 2.2 µF ceramic, tantalum, or polymer output capacitors having ESR between 10 mΩ and 6 Ω. A 2.2 µF X7R ceramic capacitor is recommended for 3.0 V versions. Unlike many LDOs, it does not require minimum ESR or series resistance, simplifying design and enabling low-impedance, high-frequency decoupling.
LP2951CMMX-3.0 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:
- Obsolete
- 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
LP2951CMMX-3.0 FAQ
1.How can I place an order for LP2951CMMX-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CMMX-3.0 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 LP2951CMMX-3.0 reliable?
The price and inventory of LP2951CMMX-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951CMMX-3.0 is usually 5 days.
3.What payment methods are accepted for LP2951CMMX-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CMMX-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CMMX-3.0?
LP2951CMMX-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CMMX-3.0 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 LP2951CMMX-3.0?
For technical support, including LP2951CMMX-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CMMX-3.0 requirements.
6.How does Aetrix verify that LP2951CMMX-3.0 is sourced from the original manufacturer or authorized distributors?
All LP2951CMMX-3.0 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 LP2951CMMX-3.0 meets industry standards.
7.What is the process for return or replacement of LP2951CMMX-3.0?
All LP2951CMMX-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CMMX-3.0, 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 LP2951CMMX-3.0 part is unused and in its original packaging.
Return procedure for LP2951CMMX-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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