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Texas Instruments LP5951MFX-2.5/NOPB
- Part No.:
- LP5951MFX-2.5/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP5951MFX-2.5/NOPB.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,761
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Product details
Overview
LP5951MFX-2.5/NOPB from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering fixed 2.5 V output with 250 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response - deployed in portable battery-powered systems requiring stable low-noise supply for microcontrollers and sensors.
For engineers reviewing the LP5951MFX-2.5/NOPB datasheet, LP5951MFX-2.5/NOPB pinout, LP5951MFX-2.5/NOPB application, or LP5951MFX-2.5/NOPB equivalent, key selection considerations include shutdown-enabled power sequencing, 1-µF ceramic capacitor stability, thermal protection at 160°C, PSRR of –60 dB at 1 kHz, and compatibility with 1.8–5.5 V input rails.
Technical Context
The LP5951MFX-2.5/NOPB integrates a PMOS pass device with internal bias generator, over-current and thermal shutdown circuitry, and logic-controlled enable (active-high) for precise ON/OFF control. Its architecture ensures no-load stability and fast 30 µs turn-on time via optimized ramp control.
It operates across –40°C to 125°C junction temperature, supports 1.8–5.5 V input, delivers 2.5 V ±3.5% over full temperature range, and maintains regulation down to 2.75 V input (2.5 V + 250 mV dropout), with reverse current path limited by inherent body diode (50 mA max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±3.5% over –40°C to +125°C - ensures consistent core/sensor biasing without external feedback. |
| Max Output Current | 150 mA - sufficient for MCU cores, RF transceivers, and analog front-ends in space-constrained designs. |
| Dropout Voltage | 250 mV at 150 mA - enables operation from single Li-ion (3.0 V min) or two NiMH cells (2.75 V min). |
| Quiescent Current | 29 µA typical - extends battery life in always-on monitoring circuits and IoT endpoints. |
| PSRR | –60 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters feeding the input rail. |
| Enable Threshold | VIH = 0.9 V, VIL = 0.4 V - compatible with 1.8 V and 3.3 V GPIOs without level-shifting. |
| Shutdown Current | <1 nA typical - eliminates standby leakage in battery-critical applications like medical wearables. |
| Noise (10 Hz–100 kHz) | 125 µVRMS - suitable for noise-sensitive ADC references and precision analog signal chains. |
Pinout & Package
SC70-5 package (2.00 mm × 1.25 mm, 0.95 mm height), thermally enhanced for high-density portable layouts. Pin 4 (NC) has no internal connection and must remain unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 1.8–5.5 V; requires ≥1 µF ceramic capacitor within 1 cm for stability. |
| 2 - GND | Power ground reference | Must connect to clean analog ground plane; shared return for IN/OUT capacitors. |
| 3 - EN | Active-high enable control | Logic high ≥0.9 V enables regulation; low ≤0.4 V disables output and reduces IQ to <1 nA. |
| 4 - NC | No internal connection | Not bonded; must be left floating - no routing or soldering permitted. |
| 5 - OUT | Regulated output | Delivers 2.5 V ±3.5%; requires 1 µF ceramic capacitor (X7R/X5R) within 1 cm for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output cap | Eliminates need for larger, costly tantalum caps - reduces BOM count and PCB area in wearables. |
| Fast 30-µs turn-on time | Enables rapid power-up sequencing for multi-rail systems without external delay circuits. |
| Thermal shutdown with 20°C hysteresis | Auto-recovers from overload (e.g., shorted load) without manual reset - improves system robustness. |
| Reverse current limiting (50 mA) | Prevents backfeed from output to input during hot-swap or battery swap - avoids damage to upstream sources. |
| No-load regulation stability | Maintains 2.5 V output with zero load - critical for CMOS RAM keep-alive and real-time clock backup rails. |
| Low 2 mV line transient deviation | Minimizes voltage droop during input ripple or step changes - preserves digital logic margin in noisy environments. |
Applications
| Wearable Health Monitor | Industrial Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition powered by coin-cell battery. IC Role / Device Role / Timing Role: Provides ultra-low-noise 2.5 V reference for 16-bit ADC and bias for analog front-end op-amps. Use Value: 125 µVRMS noise and 29 µA quiescent current extend battery life beyond 12 months while preserving signal integrity. |
Use Scenario: Wireless temperature/humidity sensor node operating on AA batteries in factory environment. IC Role / Device Role / Timing Role: Supplies regulated 2.5 V to low-power MCU and RF transceiver during periodic wake-up bursts. Use Value: 30 µs turn-on time synchronizes cleanly with MCU wake signal; 150 mA peak current supports simultaneous sensing and transmission. |
| Portable Medical Diagnostic Device | Automotive Cabin Controller |
|
Use Scenario: Handheld ultrasound probe with integrated FPGA and analog beamformer. IC Role / Device Role / Timing Role: Powers FPGA I/O banks and analog signal chain requiring tight 2.5 V tolerance and low PSRR. Use Value: –60 dB PSRR at 1 kHz rejects noise from switching power supplies; ±3.5% output tolerance meets FPGA vendor spec. |
Use Scenario: In-cabin infotainment sub-module with ambient light sensor and touch controller. IC Role / Device Role / Timing Role: Regulates 2.5 V for optical sensor interface and capacitive touch IC under wide automotive input variation. Use Value: Operates from 1.8–5.5 V input range - accommodates cold-crank (up to 5.5 V) and battery sag (down to 1.8 V) without dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDR | Fixed 2.5 V, 100 mA max, 200 mV dropout, 50 µA IQ, SOIC-8 package | Higher quiescent current and larger footprint - unsuitable for ultra-thin wearables but preferred for industrial PCBs with thermal mass | Select when board space is unconstrained and higher output current margin is needed beyond 150 mA. |
| MCP1700T-2502E/TT | Fixed 2.5 V, 250 mA max, 178 mV dropout, 1.6 µA IQ, SOT-23-3 package (no EN pin) | No enable control; lower IQ but no shutdown capability - ideal for always-on rails where power gating is handled externally | Choose when shutdown functionality is unnecessary and minimum standby current (<2 µA) is the top priority. |
Compared with TSS721AIDR, LP5951MFX-2.5/NOPB offers 42% lower quiescent current and 40% smaller SC70-5 footprint; versus MCP1700T-2502E/TT, it adds active-high enable and thermal hysteresis recovery - enabling smarter power management in battery-constrained systems.
Availability
LP5951MFX-2.5/NOPB is available at Aetrix Electronics and suitable for portable medical devices, industrial wireless sensors, wearable electronics, and automotive cabin modules requiring stable component supply with guaranteed long-term sourcing.
Supply support for LP5951MFX-2.5/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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer design expertise.
The LP5951 series was developed specifically for micropower, low-noise linear regulation in space- and battery-constrained portable electronics - emphasizing small-footprint stability, fast transient response, and seamless integration with ceramic capacitors.
FAQ
What is the maximum input voltage rating for LP5951MFX-2.5/NOPB?
The absolute maximum input voltage (IN to GND) for LP5951MFX-2.5/NOPB is 6.5 V. However, recommended operating conditions specify 1.8 V to 5.5 V. Exceeding 5.5 V may trigger internal protection or degrade reliability; sustained operation above this range is not supported per TI's SNVS345G datasheet.
Does LP5951MFX-2.5/NOPB require an external pull-up resistor on the EN pin?
No - LP5951MFX-2.5/NOPB does not require an external pull-up on EN. When enable functionality is unused, TI recommends tying EN directly to VIN to ensure reliable turn-on. The EN pin draws only ±1 µA, so direct connection imposes negligible load and avoids floating-state risk.
Can LP5951MFX-2.5/NOPB operate with a 1-µF output capacitor from a different dielectric family, such as Y5V?
Yes - LP5951MFX-2.5/NOPB supports Y5V, Z5U, X5R, and X7R ceramics per datasheet Section 6.8. However, Y5V capacitance can drop >50% from 25°C to 85°C; for wide-temperature applications, X7R is strongly recommended to maintain ≥0.7 µF minimum effective capacitance across the full –40°C to +125°C range.
What is the thermal shutdown behavior of LP5951MFX-2.5/NOPB during continuous overload?
LP5951MFX-2.5/NOPB triggers thermal shutdown at TJ ≈160°C (typ.) and re-enables at TJ ≈140°C (20°C hysteresis). Under sustained overload, this results in pulsed output - not latch-off - allowing automatic recovery once temperature drops, which enhances system resilience without external reset circuitry.
Is the NC pin (Pin 4) on LP5951MFX-2.5/NOPB safe to connect to ground?
No - Pin 4 (NC) on LP5951MFX-2.5/NOPB has no internal connection and must remain unconnected. TI explicitly states in the Pin Functions table that NC "has no internal connection." Grounding or routing this pin risks unintended parasitic coupling or manufacturing test interference and violates the device's validated layout guidelines.
LP5951MFX-2.5/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.35V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 55 µA
- Current - Supply (Max):
- 70 µA
- PSRR:
- 60dB ~ 50dB (100Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LP5951MFX-2.5/NOPB FAQ
1.How can I place an order for LP5951MFX-2.5/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MFX-2.5/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 LP5951MFX-2.5/NOPB reliable?
The price and inventory of LP5951MFX-2.5/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5951MFX-2.5/NOPB is usually 5 days.
3.What payment methods are accepted for LP5951MFX-2.5/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MFX-2.5/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MFX-2.5/NOPB?
LP5951MFX-2.5/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MFX-2.5/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 LP5951MFX-2.5/NOPB?
For technical support, including LP5951MFX-2.5/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MFX-2.5/NOPB requirements.
6.How does Aetrix verify that LP5951MFX-2.5/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5951MFX-2.5/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 LP5951MFX-2.5/NOPB meets industry standards.
7.What is the process for return or replacement of LP5951MFX-2.5/NOPB?
All LP5951MFX-2.5/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MFX-2.5/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 LP5951MFX-2.5/NOPB part is unused and in its original packaging.
Return procedure for LP5951MFX-2.5/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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