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Texas Instruments LP5951MG-3.0
- Part No.:
- LP5951MG-3.0
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LP5951MG-3.0.pdf
- Description:
- IC REG LINEAR 3V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,450
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Product details
Overview
LP5951MG-3.0 from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering a 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 stable power source for battery-powered microcontrollers, RF transceivers, and portable sensors requiring low-noise, fast-enable operation.
For engineers reviewing the LP5951MG-3.0 datasheet, LP5951MG-3.0 pinout, LP5951MG-3.0 application, or LP5951MG-3.0 equivalent, key selection criteria include shutdown current (<1 nA), PSRR (–60 dB at 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 LP5951MG-3.0 integrates a PMOS pass device with internal bias generator, over-current and thermal protection, and fast-turnon architecture enabling 30 µs startup. Its no-load stability supports RAM keep-alive circuits without external load.
Enable control is active-high with VIH = 0.9 V and VIL = 0.4 V across –40°C to 125°C; EN pin must not float and may be tied to VIN for permanent operation. Reverse current path exists via parasitic body diode, limiting output-to-input backfeed to 50 mA unless externally clamped.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±3.5% over –30°C to +125°C - ensures stable core supply for 3.0 V logic and analog circuitry |
| Max Output Current | 150 mA - sufficient for MCU cores, BLE radios, and sensor signal chains without derating at TA ≤85°C |
| Dropout Voltage | 250 mV at 150 mA (VOUT ≥2.5 V) - enables regulation down to VIN = 3.25 V, critical for single-cell Li-ion or Li-poly systems |
| Quiescent Current | 29 µA typical at no load - extends battery life in always-on IoT endpoints and wearables |
| PSRR | –60 dB at 1 kHz - suppresses switching noise from DC/DC converters feeding the LDO input |
| Enable Thresholds | VIL = 0.4 V (shutdown), VIH = 0.9 V (enable) - compatible with 1.8 V GPIO and open-drain controllers |
| Shutdown Current | <1 nA typical - eliminates standby drain in long-life battery applications |
| Thermal Shutdown | 160°C trip with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking |
Pinout & Package
LP5951MG-3.0 is packaged in SC70-5 (2.00 mm × 1.25 mm), optimized for space-constrained portable designs. Pin functions are validated per TI SNVS345G Rev G.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input voltage supply | Accepts 1.8 V to 5.5 V; must exceed VOUT + VDO (≥3.25 V) for regulation |
| 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; low ≤0.4 V disables output and reduces IQ to <1 nA |
| 4 - NC | No internal connection | Must remain unconnected; no routing or soldering allowed |
| 5 - OUT | Regulated output | Delivers 3.0 V ±3.5%; requires 1 µF ceramic capacitor (X7R/X5R) within 1 cm for stability |
Key Features
| Feature | Design Value |
|---|---|
| No-load stability | Maintains regulation with zero output current - enables use in CMOS RAM keep-alive and ultra-low-power sleep modes |
| Fast turnon time | 30 µs typical - minimizes wake-up latency in duty-cycled sensor nodes and wireless transceivers |
| Low-ESR capacitor support | Stable with 1 µF ceramic output capacitor (ESR 3–300 mΩ) - eliminates need for bulky tantalum or electrolytic caps |
| Reverse current protection | Parasitic body diode limits backfeed to 50 mA - avoids unintended power injection when VOUT > VIN, e.g., during hot-swap or backup battery switchover |
| Thermal hysteresis | 20°C hysteresis between 160°C shutdown and 140°C recovery - prevents oscillation under continuous thermal overload |
| Line transient rejection | ±2 mV deviation for 0.6 V input step - preserves signal integrity in noise-sensitive ADCs and RF front-ends |
Applications
| Wearable Health Monitor | BLE Wireless Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG/PPG sensing powered by coin cell or thin-film battery. IC Role / Device Role / Timing Role: Primary 3.0 V supply for ultra-low-power MCU, analog front-end, and BLE SoC during active and deep-sleep states. Use Value: 29 µA quiescent current extends battery life beyond 1 year; 30 µs turnon enables rapid sensor wake-up without voltage droop. |
Use Scenario: Battery-operated temperature/humidity node transmitting data every 5 seconds. IC Role / Device Role / Timing Role: Clean 3.0 V rail for RF transceiver and precision ADC, decoupled from noisy DC/DC converter. Use Value: –60 dB PSRR at 1 kHz rejects switching noise; ±2 mV line transient response prevents packet loss during RF transmit bursts. |
| Industrial IoT Edge Controller | Portable Medical Diagnostic Device |
|
Use Scenario: Compact PLC module operating in –40°C to +85°C industrial environments. IC Role / Device Role / Timing Role: Regulated 3.0 V supply for FPGA configuration memory and isolated communication interfaces. Use Value: Guaranteed 150 mA output at 125°C junction temperature; thermal shutdown with hysteresis prevents field failures under enclosure overheating. |
Use Scenario: Handheld ultrasound or glucose meter requiring FDA-compliant power integrity. IC Role / Device Role / Timing Role: Low-noise 3.0 V source for analog signal chain and touch controller, immune to battery voltage sag. Use Value: 125 µVRMS output noise (10 Hz–100 kHz) avoids baseline drift in sensitive amplifiers; fixed 3.0 V eliminates calibration drift from adjustable regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGEDR | 7-channel high-side driver with integrated 3.3 V LDO; 500 mA output; 40 µA IQ; no enable pin | Designed for LED/relay driving with built-in logic-level translation; not a standalone regulator | Select only if multi-channel switching + regulation is required; not drop-in for LP5951MG-3.0's single-rail role |
| MCP1700T-3002E/MB | SOT-23-3 package; 250 mA output; 1.6 µA IQ; 600 mV dropout at 250 mA; no enable pin | Lacks enable control and SC70 footprint; higher dropout limits use with low-VIN sources like 3.6 V Li-ion | Choose when board space allows SOT-23-3 and enable functionality is unnecessary; verify thermal performance at 150 mA |
Compared with TPL7407LPGEDR and MCP1700T-3002E/MB, LP5951MG-3.0 uniquely combines SC70-5 footprint, active-high enable, <1 nA shutdown, and 250 mV dropout at 150 mA - making it optimal for space- and power-constrained portable systems requiring precise 3.0 V regulation with dynamic control.
Availability
LP5951MG-3.0 is available at Aetrix Electronics and suitable for wearable electronics, BLE sensor networks, industrial edge controllers, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP5951MG-3.0 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 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-powered portable systems where minimal quiescent current, fast transient response, and small-footprint packaging are essential design requirements.
FAQ
What is the minimum input voltage required for LP5951MG-3.0 to regulate at 3.0 V?
The LP5951MG-3.0 requires VIN ≥ VOUT + VDO = 3.0 V + 0.25 V = 3.25 V for full 150 mA regulation. Below this, output voltage drops linearly. Absolute minimum VIN is 1.8 V, but regulation only begins once VIN exceeds 3.25 V or 1.8 V - whichever is greater - per datasheet Section 7.4.2.
Can LP5951MG-3.0 operate without an output capacitor?
No. LP5951MG-3.0 requires a minimum 0.7 µF ceramic output capacitor (X7R/X5R) for stability, with 1 µF recommended. Operation without COUT risks oscillation, excessive noise, and failure to maintain regulation under load transients - as confirmed in Section 6.8 and Figure 10 of the SNVS345G datasheet.
Is the NC pin on LP5951MG-3.0 safe to connect to ground or leave floating?
The NC pin (Pin 4) has no internal connection and must remain unconnected - neither grounded nor tied to any net. Connecting it risks internal leakage paths or undefined behavior. TI explicitly states in Pin Functions (Section 5) that NC "must not be connected" and provides no electrical specification for it.
How does LP5951MG-3.0 behave when the output is forced above the input voltage?
When VOUT > VIN, LP5951MG-3.0's internal PMOS body diode becomes forward-biased, allowing reverse current up to 50 mA. Beyond this, external protection (e.g., Schottky diode from VOUT to VIN) is required to prevent damage - as detailed in Section 7.3.6 "Reverse Current Path" of the datasheet.
Does LP5951MG-3.0 support 1.8 V GPIO for enable control?
Yes. LP5951MG-3.0's enable threshold VIH = 0.9 V (max) and VIL = 0.4 V (min) across –40°C to +125°C ensures reliable activation by 1.8 V logic outputs. A 1.8 V GPIO driving EN meets the 0.9 V VIH margin with >1 V noise immunity, satisfying Section 6.6 Enable Control Characteristics.
LP5951MG-3.0 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):
- 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:
- SC-70-5
LP5951MG-3.0 FAQ
1.How can I place an order for LP5951MG-3.0 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MG-3.0 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-3.0 reliable?
The price and inventory of LP5951MG-3.0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5951MG-3.0 is usually 5 days.
3.What payment methods are accepted for LP5951MG-3.0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MG-3.0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MG-3.0?
LP5951MG-3.0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MG-3.0 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-3.0?
For technical support, including LP5951MG-3.0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MG-3.0 requirements.
6.How does Aetrix verify that LP5951MG-3.0 is sourced from the original manufacturer or authorized distributors?
All LP5951MG-3.0 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-3.0 meets industry standards.
7.What is the process for return or replacement of LP5951MG-3.0?
All LP5951MG-3.0 units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MG-3.0, 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-3.0 part is unused and in its original packaging.
Return procedure for LP5951MG-3.0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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