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Texas Instruments LP5951MG-3.3
- Part No.:
- LP5951MG-3.3
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LP5951MG-3.3.pdf
- Description:
- IC REG LINEAR 3.3V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,880
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Product details
Overview
LP5951MG-3.3 from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering a fixed 3.3 V output with 250 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response - used to power low-power microcontrollers and RF modules in portable battery-operated devices.
For engineers reviewing the LP5951MG-3.3 datasheet, LP5951MG-3.3 pinout, LP5951MG-3.3 application, or LP5951MG-3.3 equivalent, key selection criteria include shutdown current (<1 nA), PSRR (–60 dB @ 1 kHz), thermal protection (160°C trip), stability with 1-µF ceramic output capacitor, and enable logic thresholds (0.4 V / 0.9 V).
Technical Context
The LP5951MG-3.3 integrates a PMOS pass device with internal bias generator, over-current and thermal protection circuitry, and logic-controlled enable input. Its architecture ensures no-load stability and fast turn-on (30 µs typical) without external compensation.
It operates across –40°C to 125°C junction temperature, supports input voltages from 1.8 V to 5.5 V, and maintains regulation down to VIN = VOUT + VDO (250 mV for VOUT ≥2.5 V). The NC pin has no internal connection and must not be bonded or connected.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3 V ±3.5% over –30°C to +125°C - ensures stable supply for 3.3-V logic and analog circuits. |
| Max Output Current | 150 mA continuous - sufficient for MCU cores, sensors, and low-power transceivers. |
| Dropout Voltage | 250 mV at 150 mA (VOUT ≥2.5 V) - enables operation from single-cell Li-ion or two-cell alkaline inputs. |
| Quiescent Current | 29 µA typical at no load - extends battery life in always-on monitoring applications. |
| PSRR | –60 dB at 1 kHz - suppresses ripple from noisy switching supplies feeding the LDO input. |
| Shutdown Current | <1 nA typical - eliminates standby drain in battery-critical systems during deep sleep. |
| Enable Thresholds | VIL = 0.4 V max (shutdown), VIH = 0.9 V min (enable) - compatible with 1.8-V and 3.3-V GPIO logic levels. |
Pinout & Package
LP5951MG-3.3 is packaged in SC70-5 (2.00 mm × 1.25 mm), a space-constrained surface-mount package optimized for portable electronics. Pin 4 (NC) is unconnected internally and must remain floating or unpopulated on PCB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 1.8 V to 5.5 V; requires local 1-µF ceramic capacitor within 1 cm for stability. |
| 2 (GND) | Power ground reference | Must connect to clean analog ground plane; shared return path for IN and OUT capacitors. |
| 3 (EN) | Active-high enable control | Pulled high to enable regulation; pulled ≤0.4 V to enter shutdown with <1 nA current draw. |
| 4 (NC) | No internal connection | Not bonded; must be left unconnected - no trace, pad, or solder mask opening required. |
| 5 (OUT) | Regulated output | Delivers 3.3 V ±3.5%; requires 1-µF ceramic capacitor (X7R/X5R) within 1 cm for transient response. |
Key Features
| Feature | Design Value |
|---|---|
| No-load stability | Maintains regulation with zero output load - critical for RAM keep-alive and ultra-low-power sleep modes. |
| Fast turn-on time | 30 µs typical - enables rapid wake-up from shutdown without system timing violations. |
| Thermal shutdown | Triggers at 160°C (typ.) with 20°C hysteresis - prevents permanent damage during sustained overload. |
| Short-circuit protection | Limits output current to ~150–400 mA - avoids latch-up and enables safe recovery after fault clearance. |
| Reverse current blocking | Parasitic body diode allows ≤50 mA reverse current - external Schottky required if VOUT > VIN exceeds limit. |
Applications
| Wearable Health Monitor | IoT Sensor Node |
|---|---|
|
Use Scenario: Continuous ECG signal acquisition powered by coin-cell battery. IC Role / Device Role / Timing Role: Primary 3.3-V supply for ultra-low-power MCU and analog front-end. Use Value: 29 µA quiescent current extends battery life beyond 1 year; 1-µF ceramic compatibility reduces BOM count and board area. |
Use Scenario: Battery-powered environmental sensor transmitting data via BLE every 5 minutes. IC Role / Device Role / Timing Role: Regulated rail for BLE SoC and digital sensors during active transmit bursts. Use Value: ±2 mV line transient response prevents brownout during RF transmit spikes; 30 µs turn-on enables immediate post-wakeup operation. |
| Industrial Handheld Scanner | Medical Point-of-Care Device |
|
Use Scenario: Ruggedized barcode scanner operating from rechargeable Li-ion pack. IC Role / Device Role / Timing Role: Clean 3.3-V supply for image sensor interface and decode processor. Use Value: –60 dB PSRR at 1 kHz rejects noise from charging circuitry; thermal shutdown protects against enclosure overheating. |
Use Scenario: Portable blood glucose meter with LCD display and USB charging. IC Role / Device Role / Timing Role: Isolated 3.3-V rail for safety-critical measurement circuitry. Use Value: Fixed 3.3 V output meets IEC 62304 Class B requirements; 125°C max junction rating supports sealed enclosure operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPL7407LPGQ | 7-channel high-side driver with integrated 3.3-V LDO (150 mA), higher IQ (50 µA), no EN pin. | Designed for LED/relay driving; LDO is auxiliary, not primary regulator. | Select only when multi-channel switching and regulated bias are co-required. |
| MCP1700T-3302E/TT | Fixed 3.3 V, 250 mA, SOT-23-3, 1.6 µA IQ, no enable, 600 mV dropout at 250 mA. | Lacks enable control and thermal shutdown; lower current but higher dropout limits low-VIN use. | Prefer for cost-sensitive, always-on applications where shutdown and protection are unnecessary. |
Compared with LP5951MG-3.3, TPL7407LPGQ trades standalone regulation capability for integrated switching functionality, while MCP1700T-3302E/TT sacrifices enable control and thermal protection to achieve ultra-low quiescent current - making LP5951MG-3.3 the optimal choice for battery-powered systems requiring both precision regulation and robust fault management.
Availability
LP5951MG-3.3 is available at Aetrix Electronics and suitable for wearable health monitors, IoT sensor nodes, industrial handheld scanners, and medical point-of-care devices requiring stable component supply with full lifecycle support.
Supply support for LP5951MG-3.3 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 space-constrained, battery-operated applications - designed specifically to replace legacy regulators requiring larger capacitors or higher quiescent current.
FAQ
What is the maximum input voltage for LP5951MG-3.3?
The LP5951MG-3.3 supports an absolute maximum input voltage of 6.5 V on the IN pin, with recommended operation from 1.8 V to 5.5 V. Exceeding 6.5 V risks permanent damage per Absolute Maximum Ratings. For reliable long-term operation, VIN should remain ≤5.5 V and ≥VOUT + VDO (≥3.55 V for full 150-mA output at 3.3 V).
Does LP5951MG-3.3 require an output capacitor, and what type is recommended?
Yes, LP5951MG-3.3 requires a minimum 0.7 µF ceramic output capacitor (1 µF typical) with ESR between 3 mΩ and 300 mΩ. X7R or X5R dielectrics are recommended for stable capacitance over temperature and DC bias. Tantalum capacitors are discouraged due to higher ESR, cost, and surge-current risks.
Can LP5951MG-3.3 be used without connecting the EN pin?
No - the EN pin must not be left floating. To operate LP5951MG-3.3 continuously, tie EN directly to VIN. Leaving EN unconnected may cause erratic enable/disable behavior due to noise coupling, potentially leading to unstable output or excessive power consumption.
What is the thermal shutdown behavior of LP5951MG-3.3?
LP5951MG-3.3 activates thermal shutdown at TJ ≈160°C (typ.), turning off the PMOS pass device. It remains latched off until junction temperature falls by ~20°C (hysteresis), then resumes regulation. This pulsed operation protects against permanent damage during sustained overload or poor heatsinking conditions.
Is LP5951MG-3.3 stable with a 1-µF output capacitor?
Yes - LP5951MG-3.3 is explicitly designed and characterized for stability with 1-µF ceramic output capacitors (X7R/X5R), unlike many older LDOs requiring ≥10 µF. This enables compact, low-cost designs and eliminates need for large tantalum or electrolytic capacitors.
LP5951MG-3.3 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):
- 3.3V
- 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-3.3 FAQ
1.How can I place an order for LP5951MG-3.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MG-3.3 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-3.3 reliable?
The price and inventory of LP5951MG-3.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5951MG-3.3 is usually 5 days.
3.What payment methods are accepted for LP5951MG-3.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MG-3.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MG-3.3?
LP5951MG-3.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MG-3.3 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-3.3?
For technical support, including LP5951MG-3.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MG-3.3 requirements.
6.How does Aetrix verify that LP5951MG-3.3 is sourced from the original manufacturer or authorized distributors?
All LP5951MG-3.3 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-3.3 meets industry standards.
7.What is the process for return or replacement of LP5951MG-3.3?
All LP5951MG-3.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MG-3.3, 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-3.3 part is unused and in its original packaging.
Return procedure for LP5951MG-3.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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