My Inquiry
My Account
Texas Instruments LP5951MFX-3.0/NOPB
- Part No.:
- LP5951MFX-3.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP5951MFX-3.0/NOPB.pdf
- Description:
- IC REG LINEAR 3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,609
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP5951MFX-3.0/NOPB from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering fixed 3.0 V output with 250 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response. It serves as a precision power supply for battery-powered microcontrollers, RF transceivers, and sensor signal chains requiring stable low-noise bias.
For engineers reviewing the LP5951MFX-3.0/NOPB datasheet, LP5951MFX-3.0/NOPB pinout, LP5951MFX-3.0/NOPB application, or LP5951MFX-3.0/NOPB equivalent, key selection criteria include shutdown current (<1 nA), PSRR (–60 dB @ 1 kHz), thermal protection (160°C trip), enable logic thresholds (0.4 V/0.9 V), and compatibility with 1-µF ceramic output capacitors.
Technical Context
The LP5951MFX-3.0/NOPB employs a PMOS pass transistor architecture enabling ultra-low quiescent current and near-zero shutdown leakage. Its internal bias generator and reference circuitry remain active only during regulation, minimizing static power draw across –40°C to 125°C junction temperature range.
Enable control is implemented as a logic-level input (active-high) with guaranteed VIH = 0.9 V and VIL = 0.4 V over full temperature range, supporting direct interfacing with 1.8-V and 3.3-V digital I/O. Fast turn-on time (30 µs typ.) and load transient recovery (±50 mVpp typ.) are achieved via optimized error amplifier compensation and internal current limiting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±3.5% over –40°C to +125°C - ensures stable core/bias rail for 3.3-V logic domains with margin. |
| Max Output Current | 150 mA - supports single-core MCUs, BLE SoCs, and analog front-ends without external boost. |
| Dropout Voltage | 250 mV at 150 mA - enables operation down to 3.25 V input, critical for single-cell Li-ion or two-cell alkaline systems. |
| Quiescent Current | 29 µA typical - extends battery life in always-on sensor nodes and wearables beyond 1 year on CR2032. |
| PSRR | –60 dB at 1 kHz - suppresses switching noise from DC/DC converters feeding the LDO input. |
| Shutdown Current | <1 nA - eliminates standby drain in tamper-detect circuits and secure boot sequences. |
| Line Transient Response | ±2 mV - maintains clean supply during rapid input voltage shifts common in shared-bus power systems. |
Pinout & Package
LP5951MFX-3.0/NOPB is housed in a 2.00 mm × 1.25 mm SC70-5 surface-mount package with 0.65 mm pitch, optimized for space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 1.8 V to 5.5 V; must be ≥3.25 V for full 150-mA output at 3.0 V. |
| 2 - GND | Power ground reference | Low-impedance return path for all internal currents; requires solid copper pour under package. |
| 3 - EN | Enable control input | Active-high logic: ≥0.9 V enables regulation; ≤0.4 V forces shutdown with <1 nA IQ. |
| 4 - NC | No internal connection | Unbonded pad; must remain unconnected and not tied to any net or plane. |
| 5 - OUT | Regulated output | Delivers 3.0 V ±3.5%; requires 1-µF X7R ceramic capacitor within 1 cm for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1-µF ceramic output cap | Eliminates need for larger, higher-ESR tantalum caps-reduces BOM count and PCB area by >50% vs legacy LDOs. |
| Thermal overload protection | Auto-shutdown at 160°C (typ.) with 20°C hysteresis-prevents permanent damage during sustained overload or poor heatsinking. |
| Fast 30-µs turn-on time | Enables dynamic power gating in wake-up sequences for sub-100-µs system responsiveness. |
| Reverse current blocking | Prevents backfeed from VOUT to VIN when output is externally pulled high-avoids unintended power domain coupling. |
| Logic-compatible enable threshold | 0.4 V / 0.9 V thresholds ensure reliable interface with 1.8-V and 3.3-V GPIO without level shifters. |
Applications
| Wireless Sensor Node | Wearable Health Monitor |
|---|---|
|
Use Scenario: Sub-100-µA sleep mode with periodic BLE advertising bursts requiring clean 3.0-V supply for radio and ADC. IC Role / Device Role: Primary LDO supplying RF transceiver and analog front-end while maintaining ultra-low IQ. Use Value: 29 µA quiescent current extends CR2032 battery life to >2 years; ±2 mV line transient response prevents packet loss during RF transmit. |
Use Scenario: Continuous ECG/PPG sensing powered by coin cell, where supply noise directly impacts signal-to-noise ratio. IC Role / Device Role: Low-noise bias source for instrumentation amplifiers and SAR ADCs. Use Value: 125 µVRMS output noise and –60 dB PSRR suppress switching artifacts from companion DC/DC, improving ADC ENOB by ≥1.5 bits. |
| Industrial IoT Edge Controller | Smart Meter MCU Core Supply |
|
Use Scenario: Harsh-environment data logger operating from wide-input industrial power rails (2.7–5.5 V) with extended temperature range. IC Role / Device Role: Input-stage LDO isolating MCU core from noisy 5-V system bus. Use Value: –40°C to +125°C operation and 150-mA capability support fanless enclosures; thermal shutdown prevents field failures under ambient overheating. |
Use Scenario: Tamper-resistant metering IC requiring secure power sequencing and zero-current shutdown during intrusion detection. IC Role / Device Role: Enable-controlled supply for metrology ASIC with hardware-triggered deep-sleep mode. Use Value: <1 nA shutdown current ensures no battery drain during 10-year shelf life; active-high EN allows direct connection to tamper-detection GPIO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-quiescent-current LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel 200-mA array; 25 µA IQ per channel; 3.0 V fixed; SOT-23-8 package | Multi-rail systems needing simultaneous 3.0-V supplies for GPIO expanders, LED drivers, and sensors | Select when consolidating multiple discrete LDOs into one footprint; not suitable for single-rail space-constrained layouts. |
| MCP1703T-3002E/MB | 250-mA output; 4 µA IQ; 3.0 V fixed; SOT-23-3 package (no EN pin) | Cost-sensitive, always-on applications where enable control is unnecessary | Choose for lowest possible IQ and simplified layout; lacks shutdown capability required for battery longevity in intermittent-use devices. |
Compared with LP5951MFX-3.0/NOPB, TPL7407LPGEDR offers integration but sacrifices board-area efficiency and thermal performance per channel, while MCP1703T-3002E/MB achieves lower IQ but removes critical enable functionality needed for energy harvesting and duty-cycled systems.
Availability
LP5951MFX-3.0/NOPB is available at Aetrix Electronics and suitable for wireless sensor nodes, wearable health monitors, and industrial IoT edge controllers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for LP5951MFX-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 leader specializing in analog and embedded processing technologies, with decades of LDO design heritage focused on power integrity and efficiency.
The LP5951 product line targets ultra-low-power portable electronics, delivering micropower regulation with fast transient response and minimal external components for space- and battery-limited applications.
FAQ
What is the minimum input voltage required for LP5951MFX-3.0/NOPB to regulate at full 150 mA?
The LP5951MFX-3.0/NOPB requires VIN ≥ VOUT + VDO = 3.0 V + 0.25 V = 3.25 V to deliver 150 mA continuously. Below this, output current derates linearly per the thermal limit and dropout curve. At 3.0 V input, maximum sustainable output is ~0 mA due to insufficient headroom.
Can LP5951MFX-3.0/NOPB operate with a 0.47-µF output capacitor?
No - LP5951MFX-3.0/NOPB requires a minimum 0.7 µF output capacitance (including tolerance and DC bias derating) for guaranteed stability. A 0.47-µF capacitor falls below the 0.7 µF minimum specified in Section 6.8 and risks oscillation or poor transient response. Use ≥1 µF X7R ceramic.
Does LP5951MFX-3.0/NOPB support reverse current protection?
LP5951MFX-3.0/NOPB includes inherent reverse current blocking via its PMOS pass device, preventing current flow from OUT to IN when VOUT > VIN. However, the parasitic body diode conducts if VOUT exceeds VIN by >0.3 V; for sustained reverse bias >50 mA, an external Schottky diode is required.
What is the thermal shutdown behavior of LP5951MFX-3.0/NOPB under continuous overload?
When junction temperature reaches 160°C (typ.), LP5951MFX-3.0/NOPB disables the pass transistor. After cooling to 140°C (20°C hysteresis), it automatically resumes regulation. This results in pulsed output during sustained overload - a fail-safe mechanism that prevents permanent damage without requiring external intervention.
Is the NC pin on LP5951MFX-3.0/NOPB safe to connect to ground?
No - Pin 4 (NC) has no internal connection and must remain unconnected. Tying it to ground, VOUT, or any other net introduces parasitic capacitance or leakage paths that may degrade PSRR, increase startup delay, or cause instability. Follow TI's layout guidelines: leave NC floating and avoid routing traces or copper pours beneath it.
LP5951MFX-3.0/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):
- 3V
- 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-3.0/NOPB FAQ
1.How can I place an order for LP5951MFX-3.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MFX-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 LP5951MFX-3.0/NOPB reliable?
The price and inventory of LP5951MFX-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 LP5951MFX-3.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP5951MFX-3.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MFX-3.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MFX-3.0/NOPB?
LP5951MFX-3.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MFX-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 LP5951MFX-3.0/NOPB?
For technical support, including LP5951MFX-3.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MFX-3.0/NOPB requirements.
6.How does Aetrix verify that LP5951MFX-3.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5951MFX-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 LP5951MFX-3.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP5951MFX-3.0/NOPB?
All LP5951MFX-3.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MFX-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 LP5951MFX-3.0/NOPB part is unused and in its original packaging.
Return procedure for LP5951MFX-3.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5951MFX-3.0/NOPB Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
