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Texas Instruments LP5951MG-2.0
- Part No.:
- LP5951MG-2.0
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LP5951MG-2.0.pdf
- Description:
- IC REG LINEAR 2V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,358
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Product details
Overview
LP5951MG-2.0 from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering a fixed 2.0 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-noise supply to microcontrollers, sensors, and RF front-ends.
For engineers reviewing the LP5951MG-2.0 datasheet, LP5951MG-2.0 pinout, LP5951MG-2.0 application, or LP5951MG-2.0 equivalent, key selection considerations include its 1.8–5.5 V input range, logic-controlled active-high enable, shutdown current <1 nA, stability with 1-µF ceramic capacitors, and thermal/short-circuit protection across –40°C to 125°C junction temperature.
Technical Context
The LP5951MG-2.0 employs a PMOS pass transistor architecture enabling ultra-low quiescent current and no reverse current path without external diode (within 50 mA limit). Its internal bias generator and reference circuitry maintain regulation down to 1.8 V input, with fast 30 µs turn-on time and controlled discharge during shutdown.
It features integrated thermal overload protection (trip at 160°C, 20°C hysteresis) and short-circuit current limiting (150–400 mA), operating reliably with 1-µF X7R ceramic output capacitors and ESR as low as 3 mΩ - eliminating need for large electrolytic or tantalum capacitors in space-constrained designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.0 V ±3.5% over –40°C to +125°C - ensures stable core/sensor rail without external feedback components. |
| Max Output Current | 150 mA continuous - sufficient for MCU cores, BLE SoCs, and analog signal chains in wearables and IoT edge nodes. |
| Dropout Voltage | 250 mV at 150 mA (VOUT ≥2.5 V); 200 mV at 150 mA (VOUT <2.5 V) - enables operation from single Li-ion or two NiMH cells with margin. |
| Quiescent Current | 29 µA typical at no load - extends battery life in always-on sensor monitoring and RTC backup applications. |
| PSRR | –60 dB at 1 kHz - suppresses switching noise from DC/DC converters feeding the LDO input, critical for ADC and RF sections. |
| Enable Threshold | VIL = 0.4 V (shutdown), VIH = 0.9 V (enable) - compatible with 1.8 V logic and partial-power-down control schemes. |
| Shutdown Current | <1 nA typical - reduces system standby power to negligible levels in battery-critical applications. |
Pinout & Package
SC70-5 package (2.00 mm × 1.25 mm, 0.95 mm height) - optimized for ultra-compact PCB layouts in space-constrained portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input voltage supply | Accepts 1.8–5.5 V; must be decoupled with ≥1 µF ceramic capacitor within 1 cm for stability. |
| 2 GND | Ground reference | Primary return path for input/output currents; requires low-impedance connection to clean analog ground plane. |
| 3 EN | Enable control input | Active-high logic input; must not float; ties to VIN for permanent enable or to GPIO for dynamic power gating. |
| 4 NC | No internal connection | Unbonded pad - electrically isolated; no routing or soldering required. |
| 5 OUT | Regulated output | Delivers fixed 2.0 V; requires ≥1 µF ceramic capacitor (X7R recommended) placed adjacent to pin for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| No-load stability | Maintains regulation with zero output load - supports CMOS RAM keep-alive and always-on wake-up circuits without dummy loads. |
| Fast turn-on | 30 µs typical output ramp time - minimizes delay in power sequencing for processors and peripherals. |
| Low-noise output | 125 µVRMS (10 Hz–100 kHz) - avoids interference in precision analog and RF receiver stages. |
| Thermal protection | Auto-shutdown at 160°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Short-circuit limiting | Current-limited output (150–400 mA) - avoids catastrophic failure during accidental VOUT-to-GND shorts. |
Applications
| Wearable Health Sensor Node | BLE Wireless Module Power |
|---|---|
|
Use Scenario: Compact wrist-worn pulse oximeter with optical sensor, ADC, and low-power MCU running on coin cell. IC Role / Device Role / Timing Role: Primary 2.0 V supply for analog front-end and digital core, enabled only during measurement bursts. Use Value: 29 µA quiescent current and sub-1 nA shutdown extend battery life beyond 6 months; 1-µF capacitor footprint saves board area. |
Use Scenario: Bluetooth Low Energy module in smart home sensor, powered by 3.3 V buck converter with noisy ripple. IC Role / Device Role / Timing Role: Post-regulator cleaning supply for radio transceiver and baseband processor. Use Value: –60 dB PSRR at 1 kHz attenuates switching noise, preventing packet loss and improving RF sensitivity. |
| Industrial Temperature Transmitter | Portable Medical Diagnostic Device |
|
Use Scenario: Loop-powered 4–20 mA transmitter with local 2.0 V rail for precision op-amps and RTD interface. IC Role / Device Role / Timing Role: Stable low-noise bias source for instrumentation amplifier and sigma-delta ADC reference. Use Value: ±2 mV line transient response maintains accuracy during input voltage fluctuations caused by loop current changes. |
Use Scenario: Handheld ECG monitor using single-cell Li-ion battery and multi-rail power management. IC Role / Device Role / Timing Role: Dedicated 2.0 V supply for analog signal conditioning and low-voltage logic. Use Value: SC70-5 size enables integration into tight medical enclosure; –40°C to +125°C rating supports sterilization and wide ambient operation. |
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 |
|---|---|---|---|
| TPL720F12-DBVR | Fixed 1.2 V output; 25 µA IQ; SOT-23-5 only; no NC pin; higher PSRR (–70 dB @ 1 kHz) | Requires level-shifting for 2.0 V systems; better for ultra-low-voltage digital cores | Select when lower output voltage and tighter PSRR outweigh need for 2.0 V compatibility. |
| MCP1700T-2002E/TT | 2.0 V fixed; 1.6 µA IQ; SOT-23-3; no enable pin; 600 mV dropout at 250 mA | Lacks enable control and thermal protection; limited to low-current, non-critical applications | Choose only for cost-sensitive, low-power, always-on functions where shutdown and fault protection are unnecessary. |
Compared with LP5951MG-2.0, TPL720F12-DBVR offers superior noise rejection but mismatches the required 2.0 V rail, while MCP1700T-2002E/TT trades away enable functionality and safety features for minimal quiescent current - making LP5951MG-2.0 the balanced choice for protected, controllable 2.0 V regulation in portable systems.
Availability
LP5951MG-2.0 is available at Aetrix Electronics and suitable for wearable electronics, BLE modules, industrial transmitters, and portable medical devices requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LP5951MG-2.0 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 specializing in analog and embedded processing technologies, with leadership in power management ICs for high-reliability applications.
The LP5951 product line delivers micropower, low-noise LDOs for battery-operated portable systems - engineered for minimal board space, robust thermal behavior, and seamless integration with modern low-voltage digital and analog subsystems.
FAQ
What is the maximum input voltage rating for the LP5951MG-2.0?
The LP5951MG-2.0 has an absolute maximum input voltage of 6.5 V referenced to GND. However, its recommended operating input range is 1.8 V to 5.5 V. Exceeding 5.5 V may trigger internal protection or degrade reliability; sustained operation above this range is not supported per TI's SNVS345G datasheet.
Does the LP5951MG-2.0 require an external pull-up resistor on the EN pin?
No, the LP5951MG-2.0 does not require an external pull-up on the EN pin. When enable functionality is needed, drive EN directly from a logic source meeting VIH ≥0.9 V and VIL ≤0.4 V. If always-on operation is desired, tie EN directly to VIN - no resistor is necessary or recommended.
Can the LP5951MG-2.0 be used with a 0402-size 1-µF ceramic capacitor?
Yes, the LP5951MG-2.0 is stable with 1-µF ceramic capacitors including 0402 case size, provided the capacitor maintains ≥0.7 µF capacitance under DC bias and temperature extremes. Per TI's datasheet, X5R/X7R dielectrics are recommended; verify manufacturer's DC bias derating curve to ensure minimum 0.7 µF at 2.0 V bias.
What happens if the output voltage of the LP5951MG-2.0 is forced above the input voltage?
If VOUT exceeds VIN, the LP5951MG-2.0's internal PMOS body diode becomes forward-biased, allowing reverse current up to 50 mA. Beyond that, external protection (e.g., Schottky diode from VOUT to VIN) is required to prevent damage or uncontrolled current flow.
Is the NC pin on the LP5951MG-2.0 electrically connected internally?
No, the NC (pin 4) on the LP5951MG-2.0 is not internally connected - it is an unbonded pad with no electrical function. It must remain unconnected on the PCB; neither routing nor soldering is permitted, as per TI's pin function table in SNVS345G.
LP5951MG-2.0 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
LP5951MG-2.0 FAQ
1.How can I place an order for LP5951MG-2.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MG-2.0 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 LP5951MG-2.0 reliable?
The price and inventory of LP5951MG-2.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5951MG-2.0 is usually 5 days.
3.What payment methods are accepted for LP5951MG-2.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MG-2.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MG-2.0?
LP5951MG-2.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MG-2.0 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 LP5951MG-2.0?
For technical support, including LP5951MG-2.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MG-2.0 requirements.
6.How does Aetrix verify that LP5951MG-2.0 is sourced from the original manufacturer or authorized distributors?
All LP5951MG-2.0 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 LP5951MG-2.0 meets industry standards.
7.What is the process for return or replacement of LP5951MG-2.0?
All LP5951MG-2.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MG-2.0, 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 LP5951MG-2.0 part is unused and in its original packaging.
Return procedure for LP5951MG-2.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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