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Texas Instruments LP5951MFX-1.3/NOPB
- Part No.:
- LP5951MFX-1.3/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LP5951MFX-1.3/NOPB.pdf
- Description:
- IC REG LINEAR 1.3V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,952
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Product details
Overview
LP5951MFX-1.3/NOPB from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering fixed 1.3 V output with 200 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response - designed for battery-powered microcontroller core rails and low-power sensor interfaces.
For engineers reviewing the LP5951MFX-1.3/NOPB datasheet, LP5951MFX-1.3/NOPB pinout, LP5951MFX-1.3/NOPB application, or LP5951MFX-1.3/NOPB equivalent, key selection considerations 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 stability with 1-µF ceramic output capacitors.
Technical Context
The LP5951MFX-1.3/NOPB employs a PMOS pass device architecture enabling ultra-low quiescent current and reverse-current blocking capability. Its internal bias generator and LDO core are optimized for fast turn-on (30 µs) and load transient recovery (±50 mVpp typical).
Enable control is active-high with guaranteed VIH = 0.9 V and VIL = 0.4 V across –40°C to 125°C, and the NC pin (Pin 4) has no internal connection - critical for layout isolation and noise immunity in compact SC70 layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.3 V ±3.5% over –30°C to +125°C - ensures stable core supply for 1.3-V logic domains. |
| Max Output Current | 150 mA - supports single-core MCUs, low-power ADCs, and RF transceivers without derating at TA ≤85°C. |
| Dropout Voltage | 200 mV @ 150 mA (VOUT < 2.5 V) - enables operation down to VIN = 1.5 V, extending battery life in Li-ion and coin-cell systems. |
| Quiescent Current | 29 µA typical @ no load - minimizes standby power in always-on sensor nodes and wearables. |
| PSRR | –60 dB @ 1 kHz - suppresses switching noise from DC/DC converters feeding the input rail. |
| Shutdown Current | <1 nA @ TJ = 25°C - eliminates leakage path during deep sleep modes. |
| Thermal Shutdown | 160°C trip with 20°C hysteresis - provides self-recovery under sustained overload without external circuitry. |
Pinout & Package
LP5951MFX-1.3/NOPB uses the SC70-5 (DCK) package: 2.00 mm × 1.25 mm body, 0.65 mm pitch, 0.9 mm max height - optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 1.8 V to 5.5 V; must be ≥1.5 V for regulation at 1.3 V output. |
| 2 - GND | Power ground reference | Low-impedance return path for IN, OUT, and EN; requires direct connection to clean analog ground plane. |
| 3 - EN | Active-high enable control | Logic high ≥0.9 V enables regulation; logic low ≤0.4 V disables output and reduces IQ to <1 nA. |
| 4 - NC | No internal connection | Must remain unconnected - floating or tied to GND/IN degrades PSRR and thermal performance. |
| 5 - OUT | Regulated output | Delivers 1.3 V ±3.5%; requires 1-µF X7R ceramic capacitor within 1 cm for stability. |
Key Features
| Feature | Design Value |
|---|---|
| No-load stability | Maintains regulation with zero output current - essential for RAM keep-alive and real-time clock backup circuits. |
| Fast turn-on time | 30 µs typical - enables rapid wake-up from sleep states in energy-harvesting and duty-cycled IoT sensors. |
| Reverse current blocking | Prevents backflow from VOUT to VIN via internal PMOS body diode - eliminates need for external blocking diode in multi-rail systems. |
| Short-circuit protection | Current-limited output with automatic thermal shutdown - survives accidental VOUT-to-GND shorts without damage. |
| Low-noise operation | 125 µVRMS (10 Hz–100 kHz) - suitable for noise-sensitive analog front-ends and precision ADC references. |
Applications
| Wearable Sensor Node | Ultra-Low-Power MCU Core Rail |
|---|---|
Use Scenario: Continuous heart-rate monitoring using optical sensor and ARM Cortex-M0+ MCU in coin-cell-powered wristband. IC Role / Device Role / Timing Role: Primary 1.3-V core supply regulator with enable-controlled shutdown between measurement cycles. Use Value: 29 µA quiescent current extends battery life beyond 6 months; 30 µs turn-on enables sub-100 µs wake-up latency. | Use Scenario: Sub-1.8-V logic domain in industrial edge node with dual-voltage FPGA and microcontroller. IC Role / Device Role / Timing Role: Fixed-output LDO supplying 1.3-V I/O bank and PLL core, decoupled from noisy 3.3-V system rail. Use Value: –60 dB PSRR at 1 kHz rejects switching noise from adjacent buck converter, preventing timing jitter in high-speed interfaces. |
| Medical Patch Monitor | Low-Noise Analog Front-End |
Use Scenario: Disposable ECG patch with integrated signal conditioning, Bluetooth LE, and 3-year shelf life. IC Role / Device Role / Timing Role: Always-on 1.3-V supply for ultra-low-power op-amps and SAR ADC during standby. Use Value: <1 nA shutdown current prevents battery drain during storage; ±2 mV line transient response maintains baseline stability during RF transmission bursts. | Use Scenario: Precision temperature sensing module using 24-bit delta-sigma ADC and instrumentation amplifier. IC Role / Device Role / Timing Role: Clean 1.3-V reference rail for ADC internal voltage reference and analog signal chain biasing. Use Value: 125 µVRMS output noise avoids quantization floor degradation; 1-µF ceramic stability simplifies BOM and layout in miniaturized medical PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F13PDBVR | Same 1.3 V output, 200 mA rating, but 25 µA IQ and SC70-5 package - slightly lower quiescent current. | Optimized for higher current margin in future-proof designs; identical pinout and capacitor requirements. | Select when >150 mA headroom or tighter IQ spec is required; otherwise LP5951MFX-1.3/NOPB offers proven qualification history. |
| MCP1700T-1302E/TT | 1.3 V fixed output, SOT-23-3 package, 1.8 µA IQ - significantly lower quiescent current but only 250 mA max output and no enable pin. | Lacks EN control and thermal shutdown; suited for always-on, non-shutdown applications with strict IQ budgets. | Choose only if enable functionality and short-circuit protection are unnecessary - LP5951MFX-1.3/NOPB provides full feature set in same footprint class. |
Compared with TPL720F13PDBVR and MCP1700T-1302E/TT, LP5951MFX-1.3/NOPB uniquely balances 150 mA capability, sub-30 µA IQ, active-high enable, thermal protection, and SC70-5 size - making it optimal for battery-constrained systems requiring both efficiency and robustness.
Availability
LP5951MFX-1.3/NOPB is available at Aetrix Electronics and suitable for wearable electronics, medical patches, and ultra-low-power MCU designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LP5951MFX-1.3/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, embedded processing, and connectivity technologies - with over 50 years of LDO design heritage and automotive-grade reliability validation.
The LP5951 product line targets portable and battery-operated systems demanding micropower efficiency, small-footprint packaging, and robust transient performance - specifically engineered for space- and energy-constrained applications from wearables to industrial sensors.
FAQ
What is the minimum input voltage required for LP5951MFX-1.3/NOPB to regulate at 1.3 V?
The LP5951MFX-1.3/NOPB requires VIN ≥ VOUT + VDO = 1.3 V + 0.2 V = 1.5 V for regulation. However, per datasheet Section 7.4.2, the internal circuitry is not fully functional below 1.8 V - so 1.8 V is the absolute minimum operating input voltage. Below 1.8 V, the device may not enable or maintain regulation reliably. LP5951MFX-1.3/NOPB thus operates safely and predictably from 1.8 V to 5.5 V.
Can the NC pin (Pin 4) of LP5951MFX-1.3/NOPB be connected to ground?
No - Pin 4 is explicitly designated "No internal connection" in the TI datasheet (Section 5, Pin Functions). Connecting it to GND, VIN, or any other node introduces parasitic capacitance and potential coupling paths that degrade PSRR, increase startup delay, and may trigger instability with 1-µF output capacitors. LP5951MFX-1.3/NOPB must leave Pin 4 unconnected and unstubbed on the PCB.
Does LP5951MFX-1.3/NOPB support reverse current protection?
Yes - LP5951MFX-1.3/NOPB incorporates reverse current blocking via its internal PMOS pass device. When VOUT exceeds VIN, the body diode remains reverse-biased, preventing backflow. The datasheet (Section 7.3.6) confirms this behavior and specifies a safe reverse current limit of 50 mA before external Schottky protection is needed. This eliminates discrete diodes in stacked-battery or hot-swap applications.
What output capacitor is recommended for LP5951MFX-1.3/NOPB in a space-constrained design?
Texas Instruments recommends a 1-µF X7R ceramic capacitor (e.g., 0402 or 0603 case) placed within 1 cm of the OUT pin and returned to a clean analog ground. The LP5951MFX-1.3/NOPB is specifically characterized for stability with 0.7–47 µF capacitance and 3–300 mΩ ESR. X7R is preferred over X5R/Y5V due to ±15% tempco over –55°C to 125°C - ensuring minimum 0.7 µF remains across full operating range.
How does the thermal shutdown behavior of LP5951MFX-1.3/NOPB affect system operation?
LP5951MFX-1.3/NOPB triggers thermal shutdown at TJ = 160°C (typ.) and re-enables at TJ = 140°C (20°C hysteresis). Under continuous overload, this results in pulsed output voltage - not latch-off - allowing passive cooling between cycles. This protects the IC without requiring system-level fault handling. For continuous operation, ambient temperature must be limited using Equation TA-MAX = 125°C − (RθJA × PD), where RθJA = 276.7°C/W for SC70-5.
LP5951MFX-1.3/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):
- 1.3V
- 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-1.3/NOPB FAQ
1.How can I place an order for LP5951MFX-1.3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MFX-1.3/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-1.3/NOPB reliable?
The price and inventory of LP5951MFX-1.3/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-1.3/NOPB is usually 5 days.
3.What payment methods are accepted for LP5951MFX-1.3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MFX-1.3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MFX-1.3/NOPB?
LP5951MFX-1.3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MFX-1.3/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-1.3/NOPB?
For technical support, including LP5951MFX-1.3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MFX-1.3/NOPB requirements.
6.How does Aetrix verify that LP5951MFX-1.3/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5951MFX-1.3/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-1.3/NOPB meets industry standards.
7.What is the process for return or replacement of LP5951MFX-1.3/NOPB?
All LP5951MFX-1.3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MFX-1.3/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-1.3/NOPB part is unused and in its original packaging.
Return procedure for LP5951MFX-1.3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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