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Texas Instruments LP2951CMX-3.0/NOPB
- Part No.:
- LP2951CMX-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951CMX-3.0/NOPB.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,800
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Product details
Overview
LP2951CMX-3.0/NOPB from Texas Instruments is a micropower low-dropout (LDO) voltage regulator with fixed 3.0 V output, 100 mA rated output current, 75 µA typical quiescent current, and 380 mV dropout at full load - designed for battery-powered systems requiring stable, low-power regulation. It integrates an error flag output, logic-controlled shutdown, and internal 1.235 V reference for precision feedback.
For engineers reviewing the LP2951CMX-3.0/NOPB datasheet, LP2951CMX-3.0/NOPB pinout, LP2951CMX-3.0/NOPB application, or LP2951CMX-3.0/NOPB equivalent, this page delivers verified electrical specs, SOIC-8 package mapping, functional pin roles, real-world use cases in portable instrumentation and power-on reset circuits, and two validated alternative parts with documented technical and application differences.
Technical Context
The LP2951CMX-3.0/NOPB implements a PNP-based LDO architecture with a precision bandgap reference (1.235 V ±15 mV), error amplifier, and current-limited pass transistor. Its error comparator monitors the FEEDBACK pin against the internal reference to assert the ERROR output when VOUT drops >5% below nominal - enabling undervoltage detection without external components.
Shutdown control is TTL/CMOS-compatible: SHUTDOWN <0.6 V enables regulation; ≥2 V disables it, reducing ground current to ≤10 µA. The SENSE pin allows remote-sense operation for improved load regulation, while VTAP provides access to the internal resistor divider tap for custom feedback configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±1% over −40°C to +125°C - ensures stable supply for 3.3 V I/O-tolerant microcontrollers and sensors. |
| Dropout Voltage | 380 mV at 100 mA - enables regulation from 3.38 V input, critical for single-cell Li-ion or alkaline battery systems. |
| Quiescent Current | 75 µA typical - extends battery life in always-on monitoring devices; rises only slightly in dropout. |
| Line Regulation | 0.03% typical (30 V input range) - maintains output stability across wide input transients common in automotive or industrial rails. |
| Load Regulation | 0.04% typical (100 µA–100 mA) - minimizes voltage shift during dynamic load changes in sensor nodes. |
| Reference Voltage | 1.235 V ±15 mV - enables accurate programmable outputs via external resistors; usable as standalone low-power reference. |
| Error Flag Threshold | Typically 5% VOUT dropout - asserts ERROR low for reliable power-on reset or battery-low warning without external comparators. |
Pinout & Package
LP2951CMX-3.0/NOPB is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, with exposed thermal pad connected to GND for enhanced thermal performance (RθJA = 117.7°C/W on standard PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated output | Delivers stable 3.0 V to load; connects directly to output capacitor (2.2 µF min, low-ESR). |
| 2 (SENSE) | Output voltage sense | Remote sensing point for improved load regulation; ties to OUT in local-sense configuration. |
| 3 (SHUTDOWN) | Logic enable/disable input | Active-low control: <0.6 V = ON; ≥2 V = OFF, reducing IQ to ≤10 µA. |
| 4 (GND) | Ground reference | Power and signal return; must be low-impedance path to minimize noise and thermal resistance. |
| 5 (ERROR) | Error flag output | Open-collector output pulled low when VOUT falls >5%; used for POR or system fault indication. |
| 6 (VTAP) | Internal divider tap | Provides access to mid-point of internal 1.235 V reference divider; enables custom feedback networks. |
| 7 (FEEDBACK) | Voltage feedback input | Compares external resistor-divided VOUT against internal 1.235 V reference to regulate output. |
| 8 (IN) | Input supply | Accepts 2.3 V–30 V input; requires 1 µF ceramic input capacitor for stability and EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Logic-Controlled Shutdown | Reduces ground current to ≤10 µA in shutdown mode - essential for ultra-low-power sleep states in IoT edge nodes. |
| Integrated Error Flag | Asserts open-drain ERROR low at ~5% VOUT dropout - eliminates need for external supervisor IC in battery-monitoring applications. |
| Stable with Low-ESR Capacitors | Works with 10 mΩ–6 Ω ESR output capacitors - supports cost-effective tantalum or polymer caps without phase-margin risk. |
| High-Accuracy Reference | 1.235 V ±15 mV reference with 20 ppm/°C tempco - enables precise programmable outputs or serves as standalone 3.0 V reference source. |
| Thermal & Current Protection | Foldback current limit and thermal shutdown prevent damage during overload or poor heatsinking - improves field reliability. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Continuous glucose monitor powered by coin-cell battery with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Primary 3.0 V LDO supplying analog front-end and BLE radio; shutdown activated during sleep cycles. Use Value: 75 µA quiescent current and 380 mV dropout extend operational runtime from 3.0 V input down to 2.9 V battery endpoint. |
Use Scenario: Remote temperature/humidity logger deployed in unpowered outdoor enclosures with solar charging. IC Role / Device Role / Timing Role: Stable 3.0 V rail for ADC, microcontroller, and RF transceiver; ERROR flag triggers data flush before brownout. Use Value: Integrated error detection replaces discrete supervisor, reducing BOM count and PCB area in space-constrained designs. |
| Smart Meter Power Management | Automotive Body Control Modules |
|
Use Scenario: Electricity meter with backup supercapacitor maintaining RTC and memory during AC outage. IC Role / Device Role / Timing Role: Secondary regulator sourcing 3.0 V from supercapacitor; SENSE pin enables accurate voltage regulation under varying load. Use Value: Remote-sense capability compensates for PCB trace IR drop, ensuring ±1% accuracy at load point despite 100 mA peak currents. |
Use Scenario: Door module with LIN interface, LED drivers, and position sensors operating from 9–16 V vehicle battery. IC Role / Device Role / Timing Role: Post-regulator delivering clean 3.0 V to MCU and CAN transceiver; SHUTDOWN controlled by microcontroller wake signal. Use Value: 30 V absolute max input rating and thermal protection ensure robustness against load-dump transients up to 40 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 flag or SHUTDOWN; 200 mA output; 250 mV dropout at 100 mA. | Lacks integrated undervoltage detection and enable control - requires external supervisor and MOSFET for shutdown. | Choose when ultra-low IQ dominates and system-level supervision already exists. |
| TPS7A0530PDBVR | Higher accuracy (±0.5% initial), 200 mA output, 170 mV dropout at 100 mA, but no ERROR or SENSE pins. | No built-in error reporting or remote sensing - limits use in safety-critical or precision-sensing applications. | Prefer when tighter output tolerance and lower dropout are needed, and external fault monitoring is acceptable. |
Compared with TLV70730PDQNR and TPS7A0530PDBVR, LP2951CMX-3.0/NOPB uniquely combines error flag, shutdown, and SENSE functionality in a single SOIC-8 package - enabling compact, self-monitoring power rails where system-level fault response and remote regulation are required.
Availability
LP2951CMX-3.0/NOPB is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, smart meter power management, and automotive body control modules requiring stable component supply with long-term lifecycle support.
Supply support for LP2951CMX-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.
LP2951CMX-3.0/NOPB belongs to TI's LP295x-N series of micropower LDO regulators, engineered for battery-powered systems demanding high accuracy, low dropout, and integrated supervision features - not just voltage conversion.
FAQ
What is the maximum input voltage rating for LP2951CMX-3.0/NOPB?
The LP2951CMX-3.0/NOPB has an absolute maximum input voltage of 30 V, with recommended operation up to 30 V. This rating allows safe use in 24 V industrial systems and automotive environments with transient spikes, provided thermal limits are observed per the SOIC-8 RθJA of 117.7°C/W.
Does LP2951CMX-3.0/NOPB require an external resistor network to set its output voltage?
No - LP2951CMX-3.0/NOPB is a fixed-output variant delivering 3.0 V without external resistors. Its internal feedback network is factory-trimmed; FEEDBACK and VTAP pins are internally connected to configure the 3.0 V output. External resistors are only needed for programmable versions like LP2951M-ADJ.
How does the ERROR pin on LP2951CMX-3.0/NOPB function in practice?
The ERROR pin on LP2951CMX-3.0/NOPB is an open-drain output that pulls low when VOUT drops >5% below 3.0 V (i.e., below ~2.85 V). It sinks up to 400 µA at 250 mV and can directly drive a microcontroller GPIO or reset controller, eliminating external voltage supervisors in battery-backed systems.
Can LP2951CMX-3.0/NOPB operate with ceramic output capacitors?
Yes - LP2951CMX-3.0/NOPB is stable with ceramic capacitors as low as 2.2 µF and ESR down to 10 mΩ. A 2.2 µF X7R ceramic capacitor is recommended for 3.0 V versions, providing optimal phase margin and transient response without requiring series resistance.
What is the thermal shutdown behavior of LP2951CMX-3.0/NOPB under sustained overload?
Under sustained overload, LP2951CMX-3.0/NOPB activates thermal shutdown at ~150°C junction temperature, cycling the output on/off until power dissipation decreases. This protects the die but degrades long-term reliability if repeatedly triggered; proper PCB copper area and thermal vias under the exposed pad are essential for continuous 100 mA operation.
LP2951CMX-3.0/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
LP2951CMX-3.0/NOPB FAQ
1.How can I place an order for LP2951CMX-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CMX-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 LP2951CMX-3.0/NOPB reliable?
The price and inventory of LP2951CMX-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 LP2951CMX-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP2951CMX-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CMX-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CMX-3.0/NOPB?
LP2951CMX-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CMX-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 LP2951CMX-3.0/NOPB?
For technical support, including LP2951CMX-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CMX-3.0/NOPB requirements.
6.How does Aetrix verify that LP2951CMX-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP2951CMX-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 LP2951CMX-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP2951CMX-3.0/NOPB?
All LP2951CMX-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CMX-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 LP2951CMX-3.0/NOPB part is unused and in its original packaging.
Return procedure for LP2951CMX-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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