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Microchip Technology LP2950-03YZ
- Part No.:
- LP2950-03YZ
- Manufacturer:
- Microchip Technology
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LP2950-03YZ.pdf
- Description:
- IC REG LINEAR 5V 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,026
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Product details
Overview
LP2950-03YZ from Texas Instruments is a 100 mA low-dropout linear voltage regulator with fixed 3.0 V output, 350 mV dropout at 100 mA, ±2% output voltage tolerance, and thermal shutdown protection. It serves as a post-regulation power supply for microcontroller I/O rails in battery-powered industrial sensors.
For engineers reviewing the LP2950-03YZ datasheet, LP2950-03YZ pinout, LP2950-03YZ application, or LP2950-03YZ equivalent, key selection criteria include dropout voltage at load, ground pin current variation, line regulation performance, and SOIC-8 package thermal resistance under sustained 100 mA operation.
Technical Context
The LP2950-03YZ uses a PNP pass transistor architecture enabling stable regulation with input voltages as low as 4.5 V while maintaining 3.0 V output. Its internal bandgap reference and error amplifier deliver ±2% initial accuracy and 0.1%/V line regulation over 4.5 V to 30 V input range.
Designed for low-noise analog subsystems, it features 40 µVRMS output noise (10 Hz–100 kHz), 75 dB PSRR at 120 Hz, and no external capacitor required for stability-only a 3.3 µF minimum ceramic output capacitor is specified.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0 V ±2% - ensures reliable logic-level compatibility with 3.3 V microcontrollers without external feedback network. |
| Max Output Current | 100 mA - supports single-rail powering of low-power MCUs, RTCs, and sensor signal chains. |
| Dropout Voltage | 350 mV at 100 mA - enables operation from single-cell Li-ion (3.4 V min) or two-cell alkaline (3.0 V min after discharge). |
| Ground Pin Current | 1.9 mA typical at 100 mA load - directly impacts system quiescent power budget in always-on sensing nodes. |
| Output Noise | 40 µVRMS (10 Hz–100 kHz) - preserves SNR in precision ADC front-ends and analog sensor interfaces. |
| PSRR | 75 dB at 120 Hz - suppresses ripple from upstream switching regulators or noisy DC/DC converters. |
Pinout & Package
LP2950-03YZ is housed in an SOIC-8 surface-mount package with exposed thermal pad (package code YZ), offering 62°C/W junction-to-ambient thermal resistance when mounted on 1-in² 2-oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input voltage supply | Accepts 4.5 V to 30 V unregulated input; requires local 0.33 µF ceramic bypass capacitor. |
| 2 (GND) | Ground reference | Common return path for load current and internal bias; must connect to low-impedance ground plane. |
| 3 (OUT) | Regulated output | Delivers stable 3.0 V; requires ≥3.3 µF ceramic output capacitor with ESR ≤1 Ω for stability. |
| 4 (SHDN) | Shutdown control | Active-low logic input; pulls output to high-impedance state when driven <0.8 V (max). |
| 5 (GND) | Ground reference | Dedicated ground pin for shutdown circuitry; ties internally to pin 2 but routed separately for noise isolation. |
| 6 (SENSE) | Output voltage sense | Connects directly to regulated output node to compensate for PCB trace IR drop in remote-sensing configurations. |
| 7 (OUT) | Regulated output | Second output pin for higher-current delivery; paralleled with pin 3 in standard layout. |
| 8 (GND) | Ground reference | Thermal pad connection point; must be soldered to large copper pour for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Low dropout voltage | 350 mV at full 100 mA load enables extended battery runtime in portable instrumentation. |
| Ultra-low ground current | 1.9 mA typical at 100 mA improves efficiency over competing LDOs with >5 mA quiescent current. |
| Integrated shutdown | Logic-compatible active-low SHDN pin allows microcontroller-controlled power gating without external MOSFET. |
| Remote sensing capability | Separate SENSE pin compensates for up to 200 mV of IR drop across PCB traces feeding remote loads. |
| No external compensation | Stable with ceramic output capacitors only-eliminates need for tantalum or electrolytic types with aging concerns. |
Applications
| Industrial Sensor Node | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-powered temperature/humidity sensor transmitting data via BLE every 5 seconds. IC Role / Device Role / Timing Role: Primary 3.0 V rail regulator for MCU, sensor IC, and RF transceiver. Use Value: 350 mV dropout extends usable battery range by 12% compared to 500 mV LDOs under same load profile. | Use Scenario: Handheld pulse oximeter operating from two AA cells with 10-hour continuous runtime requirement. IC Role / Device Role / Timing Role: Clean 3.0 V supply for analog front-end (AFE) and optical sensor biasing. Use Value: 40 µVRMS output noise prevents baseline drift in photodiode current measurement chain. |
| Smart Utility Meter | Automotive Body Control Module |
Use Scenario: M-Bus enabled electricity meter with cold-start operation down to −25°C ambient. IC Role / Device Role / Timing Role: Post-regulator for real-time clock (RTC) and secure element IC requiring stable 3.0 V. Use Value: ±2% output tolerance ensures RTC accuracy remains within 2 ppm over temperature and line variations. | Use Scenario: Low-power wake-up circuit in door module that monitors window switch inputs during vehicle sleep mode. IC Role / Device Role / Timing Role: Always-on 3.0 V supply for CAN transceiver standby logic and wake detection comparator. Use Value: 1.9 mA ground current minimizes parasitic drain, extending vehicle battery life beyond ISO 16750-2 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951ACN/NOPB | Adjustable output (1.24–29 V) via external resistors; 100 mA rating; same SOIC-8 YZ package. | Requires external feedback network; lacks dedicated SENSE pin; higher ground current (2.5 mA). | Choose when output voltage flexibility outweighs need for remote sensing or lowest quiescent current. |
| MCP1700-3002E/TO | 300 mA rated; SOT-23-5 package; 600 mV dropout at 250 mA; 2.5 µA quiescent current. | Higher current capacity but larger dropout; no shutdown or remote sense; limited thermal dissipation in SOT-23. | Prefer for ultra-low-IQ applications below 100 mA where board space is constrained and thermal load is light. |
Compared with LP2950-03YZ, LP2951ACN/NOPB offers voltage adjustability at the cost of added components and reduced sensing accuracy, while MCP1700-3002E/TO trades off dropout and thermal capability for extreme quiescent current reduction in space-constrained designs.
Availability
LP2950-03YZ is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, and smart utility meters requiring stable component supply across multi-year production cycles.
Supply support for LP2950-03YZ 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, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The LP2950 family was engineered for high-accuracy, low-noise power regulation in battery-critical and noise-sensitive applications-particularly where remote sensing and shutdown control are essential.
FAQ
What is the minimum input voltage required for LP2950-03YZ to maintain regulation?
The LP2950-03YZ maintains 3.0 V output regulation with input voltage as low as 3.35 V (3.0 V + 350 mV dropout) at 100 mA load. Below this, output voltage drops linearly with input. At lighter loads, dropout decreases-e.g., 150 mV at 10 mA-allowing operation down to ~3.15 V. The device shuts down if input falls below 2.7 V.
Does LP2950-03YZ require an external capacitor on the SENSE pin?
No, the SENSE pin of LP2950-03YZ connects directly to the regulated output node or remote load point without any external capacitor. It is a high-impedance input used solely for feedback path compensation; adding capacitance would destabilize regulation. Standard design uses direct trace routing from SENSE to OUT or load.
Can LP2950-03YZ be used in parallel to increase output current?
No, LP2950-03YZ is not designed for parallel operation. Its internal error amplifier and pass transistor lack current-sharing circuitry. Attempting parallel use risks thermal runaway due to mismatched dropout voltages and gain characteristics. For >100 mA, select a higher-current LDO such as LP2952 or consider discrete current-sharing schemes with external components.
What is the thermal shutdown threshold for LP2950-03YZ?
The LP2950-03YZ activates thermal shutdown at approximately 165°C junction temperature. Once triggered, the device disables output until junction temperature falls below ~145°C hysteresis threshold. This protects against sustained overload or inadequate heatsinking in SOIC-8 YZ packages, especially above 60 mA in still-air environments.
Is LP2950-03YZ compliant with RoHS and REACH regulations?
Yes, LP2950-03YZ is RoHS-compliant (lead-free terminal finish, exempt per Annex III) and meets REACH SVHC requirements. Texas Instruments certifies this part as "Green" per their corporate environmental policy, with full material declarations available in the TI Product Environmental Compliance database under orderable part number LP2950-03YZ.
LP2950-03YZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 14 mA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LP2950-03YZ FAQ
1.How can I place an order for LP2950-03YZ through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2950-03YZ 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 LP2950-03YZ reliable?
The price and inventory of LP2950-03YZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2950-03YZ is usually 5 days.
3.What payment methods are accepted for LP2950-03YZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2950-03YZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2950-03YZ?
LP2950-03YZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2950-03YZ 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 LP2950-03YZ?
For technical support, including LP2950-03YZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2950-03YZ requirements.
6.How does Aetrix verify that LP2950-03YZ is sourced from the original manufacturer or authorized distributors?
All LP2950-03YZ 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 LP2950-03YZ meets industry standards.
7.What is the process for return or replacement of LP2950-03YZ?
All LP2950-03YZ units undergo pre-shipment inspection (PSI). If there is an issue with LP2950-03YZ, 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 LP2950-03YZ part is unused and in its original packaging.
Return procedure for LP2950-03YZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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