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Texas Instruments LP5951MGX-2.0/NOPB
- Part No.:
- LP5951MGX-2.0/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LP5951MGX-2.0/NOPB.pdf
- Description:
- IC REG LINEAR 2V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP5951MGX-2.0/NOPB from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering fixed 2.0 V output with 250 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response - deployed in portable battery-powered systems requiring stable low-noise supply for microcontrollers and sensors.
For engineers reviewing the LP5951MGX-2.0/NOPB datasheet, LP5951MGX-2.0/NOPB pinout, LP5951MGX-2.0/NOPB application, or LP5951MGX-2.0/NOPB equivalent, key selection criteria include shutdown-enabled power sequencing, 1-µF ceramic capacitor stability, thermal overload protection up to 160°C, and compatibility with space-constrained SC70 layouts.
Technical Context
The LP5951MGX-2.0/NOPB uses a PMOS pass device architecture enabling ultra-low quiescent current (29 µA typ.) and near-zero shutdown current (<1 nA), with internal bias generator and over-current/thermal protection circuitry. Its enable control logic operates with 0.4 V (max) low threshold and 0.9 V (min) high threshold across –40°C to 125°C.
Stability is achieved with 1-µF ceramic output capacitors (X7R/X5R, ESR 3–300 mΩ), and the device maintains regulation under no-load conditions - critical for CMOS RAM keep-alive and always-on sensor nodes. Transient performance includes 30 µs turnon time and ±2 mV dynamic line response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0 V ±3.5% over –40°C to +125°C - ensures consistent core voltage for 2.0 V I/O or logic rails. |
| Max Output Current | 150 mA continuous - supports single-core MCUs, RF transceivers, or analog front-ends without external boost. |
| Dropout Voltage | 250 mV at 150 mA (VOUT ≥2.5 V); 200 mV at 150 mA (VOUT <2.5 V) - enables operation down to VIN = 2.25 V for 2.0 V output. |
| Quiescent Current | 29 µA typical at no load - extends battery life in sleep-mode IoT endpoints beyond 10 years on coin cells. |
| PSRR | –60 dB at 1 kHz - suppresses switching noise from adjacent DC/DC converters feeding the input rail. |
| 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. |
| Thermal Shutdown | Triggers at TJ = 160°C (typ.), hysteresis 20°C - prevents permanent damage during sustained overload or poor PCB heatsinking. |
Pinout & Package
LP5951MGX-2.0/NOPB is housed in a 2.00 mm × 1.25 mm SC70-5 package with gull-wing leads, optimized for high-density portable PCBs and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 1.8–5.5 V; must be ≥2.25 V to sustain 2.0 V output at full load; requires local 1-µF ceramic decoupling. |
| 2 - GND | Power ground reference | Common return path for IN, OUT, and EN; must connect directly to clean analog ground plane with minimal trace inductance. |
| 3 - EN | Logic-enable input | Active-high control: tie to VIN for always-on operation; drive with 0.9–5.5 V logic to enable, ≤0.4 V to enter <1 nA shutdown. |
| 4 - NC | No internal connection | Unbonded pad - must remain unconnected and floating; no routing or solder mask opening required. |
| 5 - OUT | Regulated output | Delivers stable 2.0 V ±3.5%; requires 1-µF ceramic capacitor (X7R, 0603 or larger) placed within 1 cm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| No-load stability | Maintains regulation with zero output current - essential for backup power circuits powering RTC or SRAM during deep sleep. |
| Fast 30 µs turnon | Enables rapid wake-up from shutdown without brownout risk - supports duty-cycled sensors and BLE advertising intervals. |
| Reverse current blocking | Internal PFET body diode limits reverse current to ≤50 mA when VOUT > VIN - avoids backfeeding in multi-rail systems without external diodes. |
| Thermal hysteresis | 20°C temperature gap between shutdown activation (160°C) and recovery (140°C) - prevents oscillation during marginal thermal conditions. |
| SC70-5 footprint | 2.00 mm × 1.25 mm body size - saves >40% board area vs. SOT-23-5, enabling wearable and hearing-aid-class form factors. |
Applications
| Wearable Health Monitor | Industrial Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition powered by CR2032 coin cell with 10-year target lifetime. IC Role / Device Role / Timing Role: Primary 2.0 V supply for ultra-low-power MCU and analog front-end, enabled only during sampling bursts. Use Value: 29 µA quiescent current and <1 nA shutdown extend battery life; 1-µF capacitor compatibility reduces BOM count and layout area. |
Use Scenario: Wireless temperature/humidity node operating in unheated factory environments (–40°C to +85°C). IC Role / Device Role / Timing Role: Stable 2.0 V rail for precision ADC and LoRa transceiver, surviving cold-start and load transients. Use Value: ±2 mV line transient response and –60 dB PSRR maintain ADC accuracy amid noisy 3.3 V DC/DC input ripple. |
| Smart Card Reader | Medical Diagnostic Handheld |
|
Use Scenario: Battery-backed contactless smart card interface requiring secure, glitch-free 2.0 V I/O voltage. IC Role / Device Role / Timing Role: Dedicated LDO for ISO/IEC 14443-A digital interface logic, controlled via host MCU GPIO. Use Value: 0.4 V/0.9 V enable thresholds match 1.8 V host logic; thermal shutdown prevents overheating during prolonged card polling. |
Use Scenario: Portable ultrasound probe with FPGA-based beamformer and analog receive chain. IC Role / Device Role / Timing Role: Low-noise 2.0 V supply for clock distribution IC and high-speed serializer. Use Value: 125 µVRMS output noise and excellent load transient response prevent timing jitter in 100+ MHz clock paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL720F12PDBVR | Fixed 1.2 V output; 250 mA rating; 170 mV dropout at 250 mA; 25 µA IQ; SC70-5 package | Lower output voltage and higher current - suitable for 1.2 V core supplies but not direct replacement for 2.0 V logic rails | Select only if system requires 1.2 V and >150 mA; verify thermal derating at 250 mA in SC70 |
| MCP1700T-2002E/TT | Fixed 2.0 V; 250 mA; 600 mV dropout at 250 mA; 1.6 µA IQ; SOT-23-3 package (no EN) | No enable pin; higher dropout limits minimum input to 2.6 V; ultra-low IQ benefits always-on monitoring | Choose when enable control is unnecessary and input voltage ≥2.6 V; avoid if fast shutdown or low-VIN operation is required |
Compared with LP5951MGX-2.0/NOPB, TPL720F12PDBVR offers higher current but mismatches the 2.0 V requirement, while MCP1700T-2002E/TT eliminates enable functionality and raises minimum input voltage - making LP5951MGX-2.0/NOPB the optimal choice for 2.0 V, enable-controlled, low-VIN portable designs.
Availability
LP5951MGX-2.0/NOPB is available at Aetrix Electronics and suitable for wearable electronics, industrial sensor nodes, smart card interfaces, and medical handheld devices requiring stable component supply with guaranteed long-term sourcing.
Supply support for LP5951MGX-2.0/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 company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and consumer design expertise.
The LP5951 product line delivers micropower, low-noise LDOs for battery-critical portable systems - engineered for ultra-low IQ, small-footprint stability, and robust thermal/short-circuit protection in space-constrained applications.
FAQ
What is the minimum input voltage required for LP5951MGX-2.0/NOPB to regulate 2.0 V at full 150 mA load?
The LP5951MGX-2.0/NOPB requires VIN ≥ VOUT + VDO = 2.0 V + 250 mV = 2.25 V to maintain regulation at 150 mA. Below this, output voltage drops linearly with input; the absolute minimum operating VIN is 1.8 V, but regulation is not guaranteed below 2.25 V. This is confirmed in Section 6.5 Electrical Characteristics and Figure 14 of the SNVS345G datasheet.
Can LP5951MGX-2.0/NOPB operate without an output capacitor?
No - LP5951MGX-2.0/NOPB requires a minimum 0.7 µF ceramic output capacitor (X7R/X5R, ESR 3–300 mΩ) for stability, as specified in Section 6.8 and validated in Figure 10's typical application circuit. Omitting COUT causes oscillation and loss of regulation; the device is not designed for no-capacitor operation despite its no-load stability feature.
Is the NC pin on LP5951MGX-2.0/NOPB safe to connect to ground or leave floating?
The NC (pin 4) on LP5951MGX-2.0/NOPB has no internal connection and must remain unconnected - neither grounded nor tied to any net. TI explicitly states in Pin Functions (Section 5) that it is "No internal connection"; grounding it may create unintended parasitic paths or violate package-level isolation requirements.
How does LP5951MGX-2.0/NOPB behave when the output is forced above the input voltage?
When VOUT exceeds VIN, LP5951MGX-2.0/NOPB's internal PFET body diode becomes forward-biased, allowing reverse current up to 50 mA (Section 7.3.6). Beyond this, external Schottky protection (anode on VOUT, cathode on VIN) is mandatory to prevent damage or uncontrolled current flow into the input rail.
Does LP5951MGX-2.0/NOPB support adjustable output voltages?
No - LP5951MGX-2.0/NOPB is a fixed-output device with factory-trimmed 2.0 V regulation. The LP5951 family includes adjustable variants (e.g., LP5951MFX-ADJ/NOPB), but this specific part number has no feedback pin or external resistor network capability; output voltage cannot be modified post-manufacture.
LP5951MGX-2.0/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:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- 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-2.0/NOPB FAQ
1.How can I place an order for LP5951MGX-2.0/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MGX-2.0/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 LP5951MGX-2.0/NOPB reliable?
The price and inventory of LP5951MGX-2.0/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5951MGX-2.0/NOPB is usually 5 days.
3.What payment methods are accepted for LP5951MGX-2.0/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MGX-2.0/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MGX-2.0/NOPB?
LP5951MGX-2.0/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MGX-2.0/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 LP5951MGX-2.0/NOPB?
For technical support, including LP5951MGX-2.0/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MGX-2.0/NOPB requirements.
6.How does Aetrix verify that LP5951MGX-2.0/NOPB is sourced from the original manufacturer or authorized distributors?
All LP5951MGX-2.0/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 LP5951MGX-2.0/NOPB meets industry standards.
7.What is the process for return or replacement of LP5951MGX-2.0/NOPB?
All LP5951MGX-2.0/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MGX-2.0/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 LP5951MGX-2.0/NOPB part is unused and in its original packaging.
Return procedure for LP5951MGX-2.0/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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