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Texas Instruments LP5951MFX-2.8/NOPB
- Part No.:
- LP5951MFX-2.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP5951MFX-2.8/NOPB.pdf
- Description:
- IC REG LINEAR 2.8V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,699
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Product details
Overview
LP5951MFX-2.8/NOPB from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering fixed 2.8 V output with 250 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response - designed for battery-powered portable systems requiring stable low-noise power for microcontrollers and RF ICs.
For engineers reviewing the LP5951MFX-2.8/NOPB datasheet, LP5951MFX-2.8/NOPB pinout, LP5951MFX-2.8/NOPB application, or LP5951MFX-2.8/NOPB equivalent, key selection criteria include guaranteed 150-mA output current, shutdown quiescent current <1 nA, PSRR of –60 dB at 1 kHz, fast 30 µs turnon time, and compatibility with 1-µF ceramic output capacitors.
Technical Context
The LP5951MFX-2.8/NOPB integrates a PMOS pass device with internal thermal overload and short-circuit protection, enabling robust operation across –40°C to 125°C junction temperature. Its enable control features logic-high active EN pin with 0.9 V VIH threshold and 0.4 V VIL threshold, ensuring reliable switching between normal operation and ultra-low-power shutdown mode.
Stability is achieved with minimal external components: only 1-µF ceramic input and output capacitors are required, and the regulator remains stable under no-load conditions - critical for CMOS RAM keep-alive and always-on sensor subsystems where load current can drop to zero.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8 V ±3.5% over –30°C to +125°C - ensures precise biasing for 2.8-V I/O domains and low-voltage microcontrollers. |
| Max Output Current | 150 mA - sufficient to power multiple digital ICs or a single low-power MCU with peripherals. |
| Dropout Voltage | 250 mV at 150 mA (VOUT ≥ 2.5 V) - enables regulation from 3.05 V input, extending battery runtime in single-cell Li-ion or two-cell alkaline systems. |
| Quiescent Current | 29 µA typical at no load - minimizes standby power loss in battery-backed real-time clocks and wireless sensors. |
| PSRR | –60 dB at 1 kHz - suppresses ripple from noisy switching supplies feeding the LDO input, preserving analog/RF signal integrity. |
| Enable Thresholds | VIL = 0.4 V (shutdown), VIH = 0.9 V (enable) - compatible with 1.8-V and 3.3-V GPIO without level-shifting. |
| Shutdown Current | <1 nA typical - reduces system leakage to negligible levels during deep sleep modes. |
| Transient Response | ±2 mV line transient, 50 mVpp load transient - maintains tight regulation during rapid CPU or radio activity bursts. |
Pinout & Package
LP5951MFX-2.8/NOPB is packaged in SC70-5 (2.00 mm × 1.25 mm), a space-constrained surface-mount package optimized for portable electronics. Pin numbering follows top-view orientation with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 1.8 V to 5.5 V; must be ≥3.05 V to sustain 2.8 V output at full 150 mA load. |
| 2 (GND) | Ground reference | Common return path for input, output, and enable circuits; requires low-impedance PCB connection to minimize noise coupling. |
| 3 (EN) | Enable control input | Active-high logic input; tie to VIN for permanent enable or drive with MCU GPIO for dynamic power gating. |
| 4 (NC) | No internal connection | Unbonded pin; must remain unconnected - no routing or soldering permitted. |
| 5 (OUT) | Regulated output | Delivers stable 2.8 V; requires 1-µF ceramic capacitor within 1 cm, connected directly to GND via short wide trace. |
Key Features
| Feature | Design Value |
|---|---|
| No-load stability | Maintains regulation with zero output current - essential for memory backup and always-on wake-up circuits. |
| Fast 30 µs turnon | Enables rapid power sequencing in multi-rail systems without delaying processor boot or radio initialization. |
| Thermal shutdown | Engages at 160°C (typ.) with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Reverse current protection | Parasitic body diode limits reverse current to ≤50 mA; external Schottky required if VOUT > VIN exceeds this limit. |
| Low-ESR capacitor support | Stable with 3 mΩ–300 mΩ output capacitor ESR - accommodates cost-effective X5R/X7R ceramics without compensation. |
| Logic-compatible enable | VIH/VIL thresholds aligned to 1.8-V and 3.3-V logic families - eliminates need for external level shifters. |
Applications
| Wearable Health Monitor | IoT Edge Sensor Node |
|---|---|
Use Scenario: Continuous ECG signal acquisition powered by coin-cell battery with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Provides clean, low-noise 2.8 V supply to analog front-end and BLE SoC during active sensing and deep-sleep states. Use Value: 29 µA quiescent current extends battery life; ±2 mV line transient response prevents baseline drift during RF transmission bursts. | Use Scenario: Battery-operated environmental sensor transmitting temperature/humidity data every 5 minutes via LoRaWAN. IC Role / Device Role / Timing Role: Powers ultra-low-power MCU and RF transceiver, enabling dynamic power cycling between measurement and transmit phases. Use Value: <1 nA shutdown current minimizes self-discharge; 30 µs turnon allows sub-millisecond wake-up from hibernation without timing penalty. |
| Industrial PLC I/O Module | Portable Medical Diagnostic Device |
Use Scenario: DIN-rail mounted controller with isolated 24 V input powering 2.8 V logic for digital I/O expansion cards. IC Role / Device Role / Timing Role: Regulates local 2.8 V rail from intermediate 3.3 V DC-DC output, rejecting switching noise from upstream converter. Use Value: –60 dB PSRR at 1 kHz attenuates 100-kHz switching ripple by 1000×, preventing logic errors in high-speed digital interfaces. | Use Scenario: Handheld ultrasound probe requiring silent, stable power for analog beamforming and ADC sampling. IC Role / Device Role / Timing Role: Supplies low-noise 2.8 V to precision analog signal chain, decoupled from noisy digital subsystems. Use Value: 125 µVRMS output noise (10 Hz–100 kHz) preserves SNR in 16-bit medical-grade ADCs without additional filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F12-DBVR | Fixed 1.2 V output; 200-mA rating; 150 µA IQ; SC70-5 package | Not suitable for 2.8 V systems; higher quiescent current reduces battery life in ultra-low-power designs | Select only when 1.2 V rail is required and higher IQ is acceptable. |
| MCP1700T-2802E/TT | Fixed 2.8 V; SOT-23-5 package; 1.8 µA IQ; 250 mA max output | Lower IQ improves standby efficiency but larger SOT-23-5 footprint increases board area vs. SC70-5 | Prefer when lowest possible quiescent current is critical and board space permits larger package. |
Compared with LP5951MFX-2.8/NOPB, TPL720F12-DBVR offers higher output current but mismatches the required 2.8 V output and doubles quiescent current, while MCP1700T-2802E/TT delivers identical voltage with superior IQ but sacrifices the ultra-compact SC70-5 form factor needed in space-constrained wearables.
Availability
LP5951MFX-2.8/NOPB is available at Aetrix Electronics and suitable for wearable health monitors, IoT edge sensor nodes, industrial PLC I/O modules, and portable medical diagnostic devices requiring stable component supply with consistent parametric performance across production batches.
Supply support for LP5951MFX-2.8/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, embedded processing, and connectivity technologies for industrial, automotive, and consumer markets.
The LP5951 product line delivers micropower LDO regulators targeting portable and battery-operated applications where ultra-low quiescent current, small footprint, and fast transient response are essential design requirements.
FAQ
What is the minimum input voltage required for LP5951MFX-2.8/NOPB to regulate 2.8 V at full 150 mA load?
The LP5951MFX-2.8/NOPB requires a minimum input voltage of 3.05 V to maintain regulation at 150 mA, based on its 250 mV dropout specification. Below this, output voltage drops linearly with input; operation below 1.8 V input is not functional per recommended operating conditions.
Can LP5951MFX-2.8/NOPB operate without an output capacitor?
No - LP5951MFX-2.8/NOPB requires a minimum 0.7 µF ceramic output capacitor for stability, with 1 µF recommended. Operation without COUT risks oscillation and loss of regulation, even though the device remains stable at no load with COUT present.
Is the NC pin on LP5951MFX-2.8/NOPB safe to connect to ground or leave floating?
The NC pin (pin 4) on LP5951MFX-2.8/NOPB has no internal connection and must remain unconnected - neither grounded nor tied to any net. Connecting it may cause unpredictable behavior or damage due to internal floating node coupling.
How does LP5951MFX-2.8/NOPB behave when the output voltage exceeds the input voltage?
When VOUT rises above VIN, the LP5951MFX-2.8/NOPB's internal PMOS body diode becomes forward-biased, allowing up to 50 mA reverse current. Exceeding this requires an external Schottky diode from VOUT to VIN (cathode to VIN) to prevent damage or regulation loss.
Does LP5951MFX-2.8/NOPB support adjustable output voltage configurations?
No - LP5951MFX-2.8/NOPB is a fixed-output variant delivering precisely 2.8 V. The LP5951 family includes adjustable versions (e.g., LP5951MFX-ADJ/NOPB), but this specific part number is factory-trimmed for 2.8 V and lacks feedback resistor pins.
LP5951MFX-2.8/NOPB 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):
- 2.8V
- 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-2.8/NOPB FAQ
1.How can I place an order for LP5951MFX-2.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MFX-2.8/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-2.8/NOPB reliable?
The price and inventory of LP5951MFX-2.8/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-2.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP5951MFX-2.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MFX-2.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MFX-2.8/NOPB?
LP5951MFX-2.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MFX-2.8/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-2.8/NOPB?
For technical support, including LP5951MFX-2.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MFX-2.8/NOPB requirements.
6.How does Aetrix verify that LP5951MFX-2.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5951MFX-2.8/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-2.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP5951MFX-2.8/NOPB?
All LP5951MFX-2.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MFX-2.8/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-2.8/NOPB part is unused and in its original packaging.
Return procedure for LP5951MFX-2.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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