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Texas Instruments LP5951MF-2.5
- Part No.:
- LP5951MF-2.5
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP5951MF-2.5.pdf
- Description:
- IC REG LINEAR 2.5V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,037
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Product details
Overview
LP5951MF-2.5 from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering a fixed 2.5 V output with 250 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response - ideal for battery-powered microcontroller core supplies and portable sensor nodes.
For engineers reviewing the LP5951MF-2.5 datasheet, LP5951MF-2.5 pinout, LP5951MF-2.5 application, or LP5951MF-2.5 equivalent, key selection criteria include shutdown current (<1 nA), PSRR (–60 dB at 1 kHz), thermal protection (160°C trip), enable logic thresholds (0.4 V/0.9 V), and stability with 1-µF ceramic capacitors.
Technical Context
The LP5951MF-2.5 employs a PMOS pass device architecture enabling ultra-low quiescent current and reverse-current blocking via inherent body diode control. Its internal bias generator and LDO core are optimized for fast turn-on (30 µs) and load transient recovery (±50 mVpp typical).
Enable functionality is implemented as an active-high digital input controlling internal gate drive to the PMOS pass element; shutdown disables regulation and reduces ground current to <1 nA while maintaining no-load stability - critical for always-on keep-alive circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5 V ±3.5% over –40°C to +125°C - ensures stable core supply for 2.5 V logic and ADC references. |
| Max Output Current | 150 mA continuous - supports single-core MCUs, RF transceivers, and multi-sensor subsystems. |
| Dropout Voltage | 250 mV at 150 mA - enables operation down to VIN = 2.75 V, extending battery life in 3 V systems. |
| Quiescent Current | 29 µA typical at no load - minimizes standby power in sleep-mode IoT endpoints. |
| PSRR | –60 dB at 1 kHz - suppresses switching noise from DC/DC converters feeding the input rail. |
| Enable Thresholds | VIL = 0.4 V (shutdown), VIH = 0.9 V (enable) - compatible with 1.8 V GPIO and level-shifted control signals. |
| Shutdown Current | <1 nA typical - eliminates leakage impact on coin-cell or energy-harvesting storage. |
Pinout & Package
LP5951MF-2.5 is housed in a 2.00 mm × 1.25 mm SC70-5 surface-mount package, optimized for space-constrained portable designs and compatible with standard reflow profiles (260°C peak Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 1.8 V to 5.5 V; must be ≥2.75 V for full 150 mA output at 2.5 V. |
| 2 (GND) | Power ground reference | Common return path for IN, OUT, and EN; requires low-impedance PCB connection to minimize noise coupling. |
| 3 (EN) | Enable control input | Active-high logic signal; tie to VIN for permanent enable or drive with 0.9 V min to ensure reliable turn-on. |
| 4 (NC) | No internal connection | Unbonded pin; must remain unconnected - no routing or soldering required. |
| 5 (OUT) | Regulated output | Delivers stable 2.5 V; requires 1 µF ceramic capacitor (X7R, ≤300 mΩ ESR) placed within 1 cm for stability. |
Key Features
| Feature | Design Value |
|---|---|
| No-load stability | Maintains regulation with zero output current - enables use in CMOS RAM keep-alive and real-time clock backup rails. |
| Fast turn-on time | 30 µs typical - meets tight power-up sequencing requirements in multi-rail embedded systems. |
| Thermal shutdown | Triggers at 160°C (typ.) with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Short-circuit protection | Limits output current to 150–400 mA during fault - avoids catastrophic failure while allowing safe recovery after fault removal. |
| Reverse current blocking | Parasitic body diode limits reverse conduction to ≤50 mA - eliminates need for external blocking diode in most applications. |
Applications
| Wearable Health Monitor | Industrial Sensor Node |
|---|---|
|
Use Scenario: Powering ultra-low-power MCU, optical heart-rate sensor, and BLE radio from a single coin cell or rechargeable Li-ion. IC Role / Device Role / Timing Role: Primary 2.5 V core regulator providing clean, low-noise supply with sub-µA shutdown current during deep sleep. Use Value: Extends battery life beyond 12 months by minimizing quiescent draw and enabling rapid wake-up from shutdown without output overshoot. |
Use Scenario: Regulating power for a 4–20 mA loop-powered temperature transmitter with integrated ADC and HART modem. IC Role / Device Role / Timing Role: Local 2.5 V reference and analog front-end supply decoupled from noisy loop supply. Use Value: Delivers ±2 mV line transient response and –60 dB PSRR to maintain ADC accuracy despite loop voltage fluctuations and HART signal injection. |
| Smart Home Motion Detector | Medical Patch Device |
|
Use Scenario: Supplying PIR sensor, ultra-low-power MCU, and sub-GHz RF transceiver in a battery-operated occupancy sensor. IC Role / Device Role / Timing Role: Always-on 2.5 V rail enabling instant wake-on-motion detection with <1 nA shutdown current between events. Use Value: Enables >5-year battery life using CR2032 by eliminating leakage paths and supporting fast, controlled power-up of RF circuitry. |
Use Scenario: Providing regulated 2.5 V for ECG analog front-end, low-power MCU, and Bluetooth LE radio in a disposable wearable patch. IC Role / Device Role / Timing Role: Precision analog supply with 1.3 V to 3.7 V output range compatibility and guaranteed 150 mA delivery at body temperature (37°C). Use Value: Ensures consistent ECG signal integrity across –40°C to +125°C junction range, including sterilization and skin-contact thermal drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TSS721AIDBVR | Fixed 2.5 V output, 200 mA rating, 170 mV dropout, but 65 µA quiescent current and no enable pin. | Lacks logic-controlled shutdown - unsuitable for duty-cycled or energy-harvesting systems requiring sub-µA off-state. | Select when higher output current and lower dropout are prioritized over ultra-low IQ and enable control. |
| MCP1700T-2502E/TT | Fixed 2.5 V, 250 mA, 600 mV dropout, 1.6 µA quiescent current, but only specified to +125°C ambient (not junction) and no thermal shutdown. | Lower IQ benefits long-term storage, but absence of thermal protection increases risk in enclosed enclosures or high ambient conditions. | Select for cost-sensitive, thermally benign environments where extended shelf-life IQ matters more than fault robustness. |
Compared with TSS721AIDBVR and MCP1700T-2502E/TT, LP5951MF-2.5 uniquely balances ultra-low 29 µA quiescent current, integrated enable with precise 0.4 V/0.9 V thresholds, thermal shutdown, and 250 mV dropout - making it optimal for compact, battery-constrained systems demanding both efficiency and reliability.
Availability
LP5951MF-2.5 is available at Aetrix Electronics and suitable for wearable health monitors, industrial sensor nodes, smart home motion detectors, and medical patch devices requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for LP5951MF-2.5 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 portable, industrial, and automotive markets.
The LP5951 product line delivers micropower, low-noise LDO regulators designed specifically for battery-powered portable electronics requiring high PSRR, fast transient response, and minimal board area - targeting space- and energy-constrained applications.
FAQ
What is the maximum input voltage for LP5951MF-2.5?
The LP5951MF-2.5 supports an absolute maximum input voltage of 6.5 V on the IN pin, but its recommended operating range is 1.8 V to 5.5 V. Exceeding 5.5 V may trigger internal protection or degrade reliability; operation above 5.5 V is not characterized or guaranteed per the datasheet.
Does LP5951MF-2.5 require an external capacitor on the EN pin?
No, LP5951MF-2.5 does not require an external capacitor on the EN pin. The EN input is a CMOS logic interface with low input current (±1 µA), and TI's design assumes direct connection to a clean logic source or pull-up to VIN. Adding capacitance risks slowing enable timing and is not recommended unless explicitly validated for a specific noise-immunity requirement.
Can LP5951MF-2.5 operate with a 1-µF output capacitor made of Y5V dielectric?
Yes, LP5951MF-2.5 is designed to be stable with 1-µF Y5V ceramic capacitors, provided the effective capacitance remains ≥0.7 µF across temperature, DC bias, and aging. However, Y5V exhibits >50% capacitance loss from 25°C to 85°C; X7R is strongly preferred for wide-temperature applications to ensure margin.
What happens if the EN pin of LP5951MF-2.5 is left floating?
If the EN pin of LP5951MF-2.5 is left floating, the device may enter an undefined state due to noise susceptibility or internal leakage, potentially causing erratic enable/disable behavior or increased ground current. The datasheet explicitly states EN "should not be left floating" - it must be tied to VIN (for always-on) or driven actively to 0.9 V (enable) or 0.4 V (shutdown).
Is LP5951MF-2.5 rated for automotive temperature range?
No, LP5951MF-2.5 is specified for a junction temperature range of –40°C to +125°C, which meets extended industrial requirements but is not AEC-Q200 qualified or rated for full automotive (-40°C to +150°C) operation. For automotive applications, TI recommends the LP5907 or TPS7A05 families with explicit automotive qualification.
LP5951MF-2.5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
LP5951MF-2.5 FAQ
1.How can I place an order for LP5951MF-2.5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MF-2.5 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 LP5951MF-2.5 reliable?
The price and inventory of LP5951MF-2.5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5951MF-2.5 is usually 5 days.
3.What payment methods are accepted for LP5951MF-2.5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MF-2.5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MF-2.5?
LP5951MF-2.5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MF-2.5 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 LP5951MF-2.5?
For technical support, including LP5951MF-2.5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MF-2.5 requirements.
6.How does Aetrix verify that LP5951MF-2.5 is sourced from the original manufacturer or authorized distributors?
All LP5951MF-2.5 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 LP5951MF-2.5 meets industry standards.
7.What is the process for return or replacement of LP5951MF-2.5?
All LP5951MF-2.5 units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MF-2.5, 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 LP5951MF-2.5 part is unused and in its original packaging.
Return procedure for LP5951MF-2.5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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