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Texas Instruments LP5951MG-1.3
- Part No.:
- LP5951MG-1.3
- Manufacturer:
- Texas Instruments
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LP5951MG-1.3.pdf
- Description:
- IC REG LINEAR 1.3V 150MA SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,782
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Product details
Overview
LP5951MG-1.3 from Texas Instruments is a micropower, 150-mA low-dropout CMOS voltage regulator in SC70-5 package, delivering fixed 1.3 V output with 200 mV dropout at 150 mA, 29 µA quiescent current, and ±2 mV line transient response - used for powering core logic in portable battery-powered systems such as wearables and IoT sensors.
For engineers reviewing the LP5951MG-1.3 datasheet, LP5951MG-1.3 pinout, LP5951MG-1.3 application, or LP5951MG-1.3 equivalent, key selection criteria include input voltage range (1.8–5.5 V), shutdown current (<1 nA), PSRR (–60 dB @ 1 kHz), thermal protection (160°C trip), and compatibility with 1-µF ceramic output capacitors.
Technical Context
The LP5951MG-1.3 employs a PMOS pass device architecture enabling ultra-low quiescent current and inherent reverse-current blocking. Its internal bias generator and LDO core are optimized for stability with minimal 1-µF ceramic capacitors on both input and output.
Enable control is active-high with VIH = 0.9 V and VIL = 0.4 V over –40°C to 125°C, supporting direct GPIO interfacing. Thermal shutdown engages at 160°C (typ.) with 20°C hysteresis, and short-circuit protection limits peak output current to 400 mA while maintaining safe power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.3 V ±3.5% over –30°C to +125°C - ensures stable core supply for low-voltage microcontrollers and RF ICs. |
| Max Output Current | 150 mA continuous - sufficient for single-core MCUs, BLE SoCs, and sensor signal chains without derating at 25°C. |
| Dropout Voltage | 200 mV @ 150 mA (VOUT < 2.5 V) - enables operation down to VIN = 1.5 V, critical for single-cell Li-ion/Li-poly systems. |
| Quiescent Current | 29 µA typical @ no load - extends battery life in always-on sensing nodes; drops to <1 nA in shutdown mode. |
| PSRR | –60 dB @ 1 kHz - suppresses switching noise from DC/DC converters feeding the LP5951MG-1.3 input rail. |
| Line Transient Response | ±2 mV deviation - maintains clean supply during rapid input voltage shifts (e.g., battery sag or shared-rail load steps). |
| Enable Thresholds | VIL = 0.4 V, VIH = 0.9 V - compatible with 1.8-V and 3.3-V logic families without level-shifting. |
Pinout & Package
LP5951MG-1.3 is housed in a 2.00 mm × 1.25 mm SC70-5 surface-mount package with 0.65 mm pitch, optimized for space-constrained portable designs.
| 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) | Power ground reference | Common return path for IN, OUT, and EN; requires low-impedance connection to PCB ground plane. |
| 3 (EN) | Active-high enable input | Logic high (>0.9 V) enables regulation; logic low (<0.4 V) disables output and reduces IQ to <1 nA. |
| 4 (NC) | No internal connection | Unbonded pad - must remain unconnected; no routing or soldering required. |
| 5 (OUT) | Regulated output | Delivers fixed 1.3 V; requires ≥1-µF ceramic capacitor (X7R/X5R) placed adjacent to pin for transient immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No-load stability | Maintains regulation with zero output load - supports RAM keep-alive and standby modes without external dummy loads. |
| Fast turn-on time | 30 µs typical - enables rapid wake-up from deep-sleep states in energy-harvesting and duty-cycled applications. |
| Thermal overload protection | Auto-cycles output at 160°C junction temp with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Reverse current blocking | PMOS pass device blocks >99.9% of reverse current when VOUT > VIN - eliminates need for external blocking diode in backup-supply scenarios. |
| Low-noise operation | 125 µVRMS output noise (10 Hz–100 kHz) - suitable for noise-sensitive analog circuits like ADC references and RF synthesizers. |
Applications
| Wearable Sensor Node | BLE Microcontroller Core Supply |
|---|---|
|
Use Scenario: Powering an ultra-low-power ARM Cortex-M0+ MCU and MEMS accelerometer in a coin-cell–powered fitness tracker. IC Role / Device Role / Timing Role: Primary 1.3-V core regulator supplying digital logic and I/O domains; enables sub-10-µA sleep current. Use Value: 29 µA quiescent current and <1 nA shutdown current maximize battery runtime; 1-µF capacitor compatibility minimizes board area. |
Use Scenario: Providing clean, regulated 1.3 V to the core domain of a Bluetooth Low Energy SoC operating in advertising mode. IC Role / Device Role / Timing Role: Low-noise LDO isolating sensitive RF/analog circuitry from noisy digital switching transients. Use Value: –60 dB PSRR at 1 kHz suppresses DC/DC ripple; ±2 mV line transient response prevents RF lock loss during battery voltage dips. |
| Industrial Temperature Sensor Transmitter | Medical Patch Monitor Analog Front-End |
|
Use Scenario: Regulating power for a precision ΔΣ ADC and thermistor interface in a battery-operated wireless temperature probe. IC Role / Device Role / Timing Role: Stable 1.3-V reference rail for ADC bias and sensor excitation; operates across –40°C to +125°C. Use Value: ±3.5% output tolerance over full temperature range ensures measurement accuracy; thermal shutdown protects against enclosure overheating. |
Use Scenario: Supplying analog signal chain components (op-amps, filters, ADC drivers) in a disposable ECG patch with 10-year shelf life. IC Role / Device Role / Timing Role: Ultra-low-IQ regulator preserving battery capacity during long idle periods between patient data bursts. Use Value: 29 µA typical IQ and <1 nA shutdown current minimize self-discharge; SC70-5 footprint fits tight flex PCB constraints. |
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 150-mA sink driver with integrated LDO; 1.3-V output not available - closest fixed option is 1.5 V. | Designed for LED/relay driving, not precision core regulation; lacks enable pin and thermal shutdown. | Select only if multi-channel sinking is required alongside regulation; not a functional substitute for standalone 1.3-V LDO use. |
| MCP1700T-1302E/TT | 150-mA LDO in SOT-23-5; 1.3 V output, 6 µA IQ, but 600 mV dropout @ 150 mA - 3× higher dropout than LP5951MG-1.3. | Higher dropout limits usable input range (requires VIN ≥1.9 V); lower IQ benefits ultra-long-life applications where dropout is acceptable. | Prefer when lowest possible IQ dominates design priority and input headroom exceeds 600 mV; avoid in single-cell Li-ion systems. |
Compared with TPL7407LPGEDR and MCP1700T-1302E/TT, LP5951MG-1.3 uniquely combines 200-mV dropout, 29-µA IQ, and full thermal/short-circuit protection in a 2.0×1.25-mm SC70 package - making it optimal for space- and efficiency-critical 1.3-V core supplies.
Availability
LP5951MG-1.3 is available at Aetrix Electronics and suitable for wearable electronics, BLE subsystems, industrial sensor transmitters, and medical patch monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP5951MG-1.3 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 specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and connectivity solutions.
The LP5951 product line delivers micropower, low-noise LDOs for battery-powered applications - designed specifically to meet stringent requirements for quiescent current, transient response, and small-footprint stability in portable and IoT edge devices.
FAQ
What is the minimum input voltage required for LP5951MG-1.3 to regulate at 1.3 V?
The LP5951MG-1.3 requires VIN ≥ VOUT + VDO, where VDO = 200 mV at 150 mA for VOUT < 2.5 V. Thus, minimum input is 1.5 V under full load. At lighter loads, regulation begins at VIN ≥ 1.8 V per recommended operating conditions. Below 1.8 V, internal circuitry is nonfunctional.
Can LP5951MG-1.3 operate without an output capacitor?
No. The LP5951MG-1.3 requires a minimum 0.7 µF ceramic output capacitor (X7R/X5R) for stability, with 1 µF recommended. Operation without COUT risks oscillation and failure to regulate. The device is not no-capacitor stable - unlike some newer TI LDOs with advanced compensation.
Does LP5951MG-1.3 support reverse current protection?
Yes. The LP5951MG-1.3 uses a PMOS pass device whose intrinsic body diode is reverse-biased during normal operation (VIN > VOUT). When VOUT exceeds VIN, reverse current is limited to ≤50 mA by the diode's forward conduction - sufficient for most backup-supply scenarios without external diodes.
What is the thermal shutdown behavior of LP5951MG-1.3?
The LP5951MG-1.3 triggers thermal shutdown at TJ = 160°C (typ.), disabling the output until junction temperature falls by 20°C (hysteresis). During sustained overload, this results in pulsed output - a protective cycling mode that prevents permanent damage while allowing partial functionality during transient faults.
Is LP5951MG-1.3 compatible with 1.8-V GPIO for enable control?
Yes. The LP5951MG-1.3 has VIH = 0.9 V (max) and VIL = 0.4 V (min) across –40°C to +125°C, making it fully compatible with 1.8-V logic outputs. A 1.8-V GPIO high state (≥1.35 V) exceeds VIH with margin; low state (≤0.45 V) stays below VIL, ensuring robust enable/disable control.
LP5951MG-1.3 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):
- 1.3V
- 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-1.3 FAQ
1.How can I place an order for LP5951MG-1.3 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP5951MG-1.3 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-1.3 reliable?
The price and inventory of LP5951MG-1.3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP5951MG-1.3 is usually 5 days.
3.What payment methods are accepted for LP5951MG-1.3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP5951MG-1.3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP5951MG-1.3?
LP5951MG-1.3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP5951MG-1.3 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-1.3?
For technical support, including LP5951MG-1.3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP5951MG-1.3 requirements.
6.How does Aetrix verify that LP5951MG-1.3 is sourced from the original manufacturer or authorized distributors?
All LP5951MG-1.3 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-1.3 meets industry standards.
7.What is the process for return or replacement of LP5951MG-1.3?
All LP5951MG-1.3 units undergo pre-shipment inspection (PSI). If there is an issue with LP5951MG-1.3, 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-1.3 part is unused and in its original packaging.
Return procedure for LP5951MG-1.3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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