My Inquiry
My Account
Texas Instruments LP5951MGX-1.8/NOPB
- Part No.:
- LP5951MGX-1.8/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LP5951MGX-1.8/NOPB.pdf
- Description:
- IC REG LINEAR 1.8V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,836
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LP5951MGX-1.8/NOPB from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering a fixed 1.8 V output with 29 µA typical quiescent current, 250 mV dropout at 150 mA, and ±2 mV line transient response - designed for battery-powered portable systems requiring stable low-voltage rail generation.
For engineers reviewing the LP5951MGX-1.8/NOPB datasheet, LP5951MGX-1.8/NOPB pinout, LP5951MGX-1.8/NOPB application, or LP5951MGX-1.8/NOPB equivalent, key selection considerations include shutdown-enabled power sequencing, 1-µF ceramic capacitor stability, thermal overload protection, and operation across –40°C to 125°C junction temperature.
Technical Context
The LP5951MGX-1.8/NOPB uses a PMOS pass device architecture enabling ultra-low quiescent current and fast turn-on (30 µs typ.) without external compensation. Its internal bias generator and enable-controlled shutdown logic allow <1 nA shutdown current while maintaining regulation stability under no-load conditions.
It features integrated short-circuit and thermal-overload protection (trip at 160°C, 20°C hysteresis), reverse-current path management via inherent body diode (50 mA max), and PSRR of –60 dB at 1 kHz - all optimized for space-constrained digital subsystems powered by single-cell Li-ion or multi-cell alkaline sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±3.5% over –40°C to +125°C - ensures reliable core logic or I/O rail supply for low-voltage microcontrollers and sensors. |
| Max Output Current | 150 mA continuous - supports moderate-power digital loads such as BLE SoCs, ADCs, and interface ICs without thermal derating at TA ≤85°C. |
| Dropout Voltage | 250 mV at 150 mA (VOUT ≥2.5 V); 200–350 mV for 1.8 V output - enables operation down to VIN = 2.05 V, compatible with discharged Li-ion cells. |
| Quiescent Current | 29 µA typical at no load; 33 µA at 150 mA - extends battery life in always-on sensor nodes and wearables. |
| PSRR | –60 dB at 1 kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Enable Threshold | VIL = 0.4 V (shutdown), VIH = 0.9 V (enable) - compatible with 1.8 V GPIO logic without level-shifting. |
| Stability | Stable with 1 µF ceramic output capacitor (X7R/X5R, ESR 3–300 mΩ) - eliminates need for bulky tantalum or electrolytic capacitors. |
Pinout & Package
LP5951MGX-1.8/NOPB is housed in a 2.00 mm × 1.25 mm SC70-5 package with 0.65 mm lead pitch, optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 1.8 V to 5.5 V; must be ≥2.05 V for full 150 mA output at 1.8 V; requires local 1 µF ceramic decoupling within 1 cm. |
| 2 - GND | Power ground reference | Common return for IN, OUT, and EN; must connect directly to low-impedance analog ground plane to maintain PSRR and transient response. |
| 3 - EN | Logic-enable control input | Active-high enable; drives device ON when ≥0.9 V, OFF when ≤0.4 V; must not float - tie to VIN if always-on operation required. |
| 4 - NC | No internal connection | Unbonded die pad; electrically isolated - no routing or soldering required; avoid connecting to any net. |
| 5 - OUT | Regulated output voltage | Delivers fixed 1.8 V ±3.5%; requires local 1 µF ceramic capacitor (X7R recommended) placed adjacent to pin with short ground return. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 29 µA IQ enables >1-year battery life in 10 µA average-current IoT endpoints using coin cells or small Li-ion packs. |
| Ultra-low shutdown current | <1 nA shutdown leakage preserves battery charge during extended sleep modes - critical for energy-harvesting and wake-on-event designs. |
| Fast transient response | ±2 mV line transient and 50 mVpp load transient (1 mA ↔150 mA in 1 µs) maintains clean supply for high-speed digital logic during burst activity. |
| Thermal and short-circuit protection | Auto-recovering thermal shutdown (160°C trip, 140°C release) and current-limited short-circuit output prevent damage during fault conditions. |
| No-load stability | Remains in regulation with zero output load - supports RAM keep-alive, real-time clock backup, and other always-on low-IQ functions. |
Applications
| Wearable Sensor Node | BLE Microcontroller Power Rail |
|---|---|
|
Use Scenario: Compact wearable patch monitors heart rate and motion using ultra-low-power MCU and analog front-end. IC Role / Device Role / Timing Role: Primary 1.8 V supply for MCU core, RF transceiver I/O, and ADC reference - enabled only during active sensing intervals. Use Value: 29 µA quiescent current and <1 nA shutdown extend CR2032 battery life beyond 12 months; 1-µF capacitor footprint saves board area. |
Use Scenario: Bluetooth Low Energy module powers internal radio, flash memory, and GPIO peripherals from a shared 3.3 V rail. IC Role / Device Role / Timing Role: Local 1.8 V LDO for BLE SoC I/O domain, decoupled from noisy 3.3 V DC/DC converter output. Use Value: –60 dB PSRR at 1 kHz rejects switching ripple; fast 30 µs turn-on synchronizes cleanly with MCU wake-up signals. |
| Industrial Temperature Sensor Transmitter | Low-Power Camera Module Bias |
|
Use Scenario: Remote RTD/thermistor transmitter operates unattended in outdoor enclosures from 2xAA batteries. IC Role / Device Role / Timing Role: Stable 1.8 V supply for precision sigma-delta ADC and low-power UART interface across –40°C to +85°C ambient. Use Value: ±3.5% output tolerance over full temperature range ensures measurement accuracy; thermal protection prevents failure during summer peak ambient. |
Use Scenario: Miniature camera module in smart doorbell draws burst current during image capture and video streaming. IC Role / Device Role / Timing Role: Dedicated 1.8 V rail for image sensor digital core and ISP logic - dynamically enabled during frame acquisition. Use Value: 50 mVpp load transient response prevents pixel corruption during 150 mA current steps; SC70-5 package fits tight optical stack constraints. |
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 |
|---|---|---|---|
| TPL720F18PDBVR | 200 mA output, 25 µA IQ, same SC70-5 package, but requires minimum 1.5 µF output capacitance. | Better suited for higher-current bursts; less tolerant of ultra-small 1 µF ceramics in marginal layouts. | Choose when >150 mA headroom or tighter load regulation is needed, and board layout allows ≥1.5 µF COUT. |
| MCP1700T-1802E/TT | 250 mA output, 1.8 µA IQ, SOT-23-3 package (no enable), 600 mV dropout at 250 mA. | Lacks enable control and thermal shutdown; higher dropout limits usable input range with aging batteries. | Choose only for cost-sensitive, always-on applications where enable and protection are unnecessary and input stays ≥2.4 V. |
Compared with TPL720F18PDBVR and MCP1700T-1802E/TT, LP5951MGX-1.8/NOPB uniquely balances ultra-low IQ, integrated enable, robust protection, and 1-µF stability in the smallest SC70-5 footprint - making it optimal for battery-constrained, feature-rich portable electronics.
Availability
LP5951MGX-1.8/NOPB is available at Aetrix Electronics and suitable for wearable electronics, BLE modules, industrial sensor transmitters, and low-power camera systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LP5951MGX-1.8/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 leader specializing in analog and embedded processing technologies, with decades of expertise in power management IC design and high-volume manufacturing reliability.
LP5951MGX-1.8/NOPB belongs to TI's LP59xx family of micropower LDOs engineered specifically for portable, battery-operated applications demanding minimal quiescent current, small solution size, and robust thermal/short-circuit protection.
FAQ
What is the minimum input voltage required for LP5951MGX-1.8/NOPB to regulate at full 150 mA output?
The LP5951MGX-1.8/NOPB requires VIN ≥ VOUT + VDO = 1.8 V + 0.25 V = 2.05 V to deliver 150 mA while maintaining regulation. Below this, output current capability drops per the dropout curve; operation below 1.8 V input is not functional. This makes LP5951MGX-1.8/NOPB compatible with partially discharged single-cell Li-ion (2.5–4.2 V) and two-cell alkaline (2.0–3.2 V) sources.
Can LP5951MGX-1.8/NOPB operate without an enable signal connected?
Yes - LP5951MGX-1.8/NOPB can operate without an external enable signal by tying the EN pin directly to VIN. This configures the device for permanent ON operation. Leaving EN floating is prohibited; it must be actively driven high (≥0.9 V) or low (≤0.4 V) or hard-connected to VIN to ensure predictable behavior and avoid erratic output.
Does LP5951MGX-1.8/NOPB require a specific capacitor type on the output?
LP5951MGX-1.8/NOPB is optimized for 1 µF ceramic capacitors with X7R or X5R dielectric and ESR between 3 mΩ and 300 mΩ. X7R is preferred for –40°C to +125°C operation due to ±15% capacitance stability; Z5U/Y5V are acceptable only if ambient stays near 25°C. Tantalum is discouraged due to higher ESR, cost, and surge sensitivity.
How does LP5951MGX-1.8/NOPB handle reverse current flow from output to input?
LP5951MGX-1.8/NOPB contains a PMOS pass device with an inherent body diode. If VOUT exceeds VIN, reverse current flows through this diode. The device tolerates up to 50 mA reverse current; beyond that, an external Schottky diode (cathode to VIN, anode to VOUT) is required to prevent damage or regulation loss during back-drive conditions.
Is LP5951MGX-1.8/NOPB rated for automotive temperature range?
No - LP5951MGX-1.8/NOPB is specified for –40°C to +125°C junction temperature, which meets industrial and extended commercial requirements but does not comply with AEC-Q100 automotive qualification. For automotive applications, TI recommends the pin-compatible LP5907 or LP5912 families, which undergo full automotive stress testing and PPAP documentation.
LP5951MGX-1.8/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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):
- 1.8V
- 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:
- SC-70-5
LP5951MGX-1.8/NOPB FAQ
1.How can I place an order for LP5951MGX-1.8/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MGX-1.8/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 LP5951MGX-1.8/NOPB reliable?
The price and inventory of LP5951MGX-1.8/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5951MGX-1.8/NOPB is usually 5 days.
3.What payment methods are accepted for LP5951MGX-1.8/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MGX-1.8/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MGX-1.8/NOPB?
LP5951MGX-1.8/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MGX-1.8/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 LP5951MGX-1.8/NOPB?
For technical support, including LP5951MGX-1.8/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MGX-1.8/NOPB requirements.
6.How does Aetrix verify that LP5951MGX-1.8/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5951MGX-1.8/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 LP5951MGX-1.8/NOPB meets industry standards.
7.What is the process for return or replacement of LP5951MGX-1.8/NOPB?
All LP5951MGX-1.8/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MGX-1.8/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 LP5951MGX-1.8/NOPB part is unused and in its original packaging.
Return procedure for LP5951MGX-1.8/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP5951MGX-1.8/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 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…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
