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onsemi LP2951CD-3.0G
- Part No.:
- LP2951CD-3.0G
- Manufacturer:
- onsemi
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951CD-3.0G.pdf
- Description:
- IC REG LINEAR 3V 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:237
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Product details
Overview
LP2951CD-3.0G from onsemi is a micropower, low-dropout linear voltage regulator in SOIC-8 package delivering a fixed 3.0 V ±1.0% output at up to 100 mA, featuring 75 µA quiescent current, 350 mV dropout at full load, and integrated error flag and logic-level shutdown. It serves as a stable power source for battery-powered microcontrollers, sensors, and portable instrumentation.
For engineers reviewing the LP2951CD-3.0G datasheet, pinout, applications, or equivalent options, key selection criteria include its 3.0 V fixed output tolerance, SOIC-8 thermal performance (RJA = 180 °C/W), shutdown input compatibility with CMOS/TTL logic, and error output open-collector interface requiring external pull-up.
Technical Context
The LP2951CD-3.0G implements a PNP pass transistor architecture with internal 1.235 V bandgap reference and error amplifier feedback loop. Its error comparator monitors output regulation against a 5% threshold (±60 mV hysteresis), asserting low when VOUT drops below 2.85 V. Shutdown control disables regulator output with <3.0 µA standby current.
Stability requires ≥1.0 µF output capacitance (aluminum, tantalum, or multilayer ceramic); operation at 3.0 V uses internal resistor divider (Pin 1→2, Pin 6→7), eliminating external programming components. Input voltage range is 4.0 V to 30 V, with transient immunity up to 32 V for <300 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0 V ±1.0% at 25°C; maintains regulation down to 2.85 V before error flag asserts |
| Max Output Current | 100 mA continuous; current-limited to 220–300 mA under short-circuit |
| Dropout Voltage | 350 mV typical at 100 mA load; enables operation from 3.35 V input for 3.0 V output |
| Quiescent Current | 75 µA typical at no load; rises to 4.0–12 mA at 100 mA, critical for battery runtime |
| Line Regulation | 0.20% max over 4.0–30 V input; ensures stable 3.0 V despite battery discharge or supply ripple |
| Load Regulation | 0.20% max from 100 µA to 100 mA; supports mixed-signal loads with varying current draw |
| Error Flag Threshold | Asserts low when VOUT falls ≤5% below nominal (≤2.85 V); provides reliable power-on reset or brownout detection |
Pinout & Package
LP2951CD-3.0G is housed in an 8-pin SOIC (Case 751, D suffix) surface-mount package with exposed pad thermal enhancement. Pin 1 is Output, Pin 2 is Sense, Pin 3 is Shutdown, Pin 4 is Ground, Pin 5 is Feedback, Pin 6 is Error Output, Pin 7 is VO Tap, Pin 8 is Input.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Regulated 3.0 V power rail; connects directly to load and output capacitor |
| 2 | Sense | Feedback node tied to Pin 1 for fixed 3.0 V mode; enables remote sensing in adjustable configurations |
| 3 | Shutdown | Active-high logic input; >2.0 V disables regulator, reducing IQ to ≤10 µA |
| 4 | GND | Analog ground reference for regulator core, error comparator, and feedback network |
| 5 | Feedback | High-impedance (15–40 nA bias) input to error amplifier; used with external resistors for adjustable outputs |
| 6 | Error Output | Open-collector NPN output; sinks ≤400 µA when VOUT is out-of-regulation |
| 7 | VO Tap | Internal 5.0 V reference tap; connected to Pin 6 for fixed-output configuration |
| 8 | Input | Unregulated DC input; must be ≥3.35 V for 100 mA 3.0 V output; rated to 30 V continuous |
Key Features
| Feature | Design Value |
|---|---|
| Low Dropout Operation | 350 mV at 100 mA enables use with single-cell Li-ion (3.0–4.2 V) or 3.3 V system rails |
| Integrated Power-On Reset | Error output provides clean, hysteresis-stabilized reset signal without external components |
| Logic-Level Shutdown | CMOS/TTL-compatible enable/disable reduces system standby power to microamp level |
| Stable with Low-ESR Capacitors | Guaranteed stability with ≥1.0 µF aluminum/tantalum/ceramic output caps-no special low-ESR requirement |
| Thermal & Current Protection | Internally limits die temperature and output current, preventing damage during overload or ambient extremes |
Applications
| Battery-Powered Microcontroller Supply | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Powering ARM Cortex-M0+ MCU and onboard ADC in handheld environmental monitor running on two AA alkaline cells (1.8–3.2 V). IC Role / Device Role / Timing Role: Primary 3.0 V LDO providing regulated VCC and generating POR via Error Output. Use Value: 75 µA quiescent current extends battery life to >2 years in sleep mode; 350 mV dropout allows operation until cell voltage drops to ~2.65 V. | Use Scenario: Supplying precision op-amps and 16-bit sigma-delta ADC in factory-floor pressure transducer with 4–20 mA loop interface. IC Role / Device Role / Timing Role: Clean, low-noise 3.0 V rail decoupled from noisy 24 V loop supply; Error Output triggers fault reporting. Use Value: 0.20% load regulation ensures ADC reference stability across sensor excitation current changes; SOIC-8 footprint simplifies layout near analog front-end. |
| Portable Medical Pulse Oximeter | Smart Home Smoke Detector |
Use Scenario: Powering LED drivers, photodiode amplifiers, and BLE SoC in battery-operated fingertip SpO₂ sensor. IC Role / Device Role / Timing Role: Dual-role regulator: supplies 3.0 V to analog/RF sections and generates synchronized reset for firmware initialization. Use Value: Shutdown pin enables deep-sleep mode between measurements, cutting system current to <10 µA; error flag validates battery health before each measurement cycle. | Use Scenario: Providing regulated 3.0 V to CO sensor heater, electrochemical cell, and ultra-low-power MCU in lithium-thionyl chloride–powered smoke alarm. IC Role / Device Role / Timing Role: Main power regulator with brownout detection; Error Output disables heater if supply dips during alarm siren activation. Use Value: 30 V absolute maximum input withstands ESD events on long PCB traces; 180 °C/W RJA allows safe operation in sealed enclosure at 70°C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951ACD-3.0R2G | 0.5% initial output tolerance vs. 1.0% for LP2951CD-3.0G; identical pinout, package, and features | Suitable where tighter voltage accuracy is required for ADC references or precision analog circuits | Select LP2951ACD-3.0R2G when ±0.5% output tolerance is mandatory; otherwise LP2951CD-3.0G offers cost advantage |
| NCV2951ACD-3.3R2G | Automotive-grade (AEC-Q100 qualified), 3.3 V fixed output, same SOIC-8 package and feature set | Designed for automotive body electronics; not drop-in for 3.0 V systems but suitable for 3.3 V designs needing automotive qualification | Choose NCV2951ACD-3.3R2G only for automotive applications requiring PPAP and AEC-Q100 compliance at 3.3 V |
Compared with LP2951ACD-3.0R2G, the LP2951CD-3.0G trades ±0.5% output accuracy for lower cost while retaining identical functionality and thermal behavior; versus NCV2951ACD-3.3R2G, it offers 3.0 V output and industrial temperature range instead of automotive qualification and 3.3 V.
Availability
LP2951CD-3.0G is available at Aetrix Electronics and suitable for battery-powered medical devices, industrial sensor nodes, portable instrumentation, and smart home safety products requiring stable component supply and long-term manufacturability.
Supply support for LP2951CD-3.0G 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
onsemi (Nasdaq: ON) is a global semiconductor supplier delivering energy-efficient silicon solutions for automotive, industrial, cloud, medical, and IoT applications.
The LP2951 series belongs to onsemi's precision linear regulator product line, designed specifically for micropower, low-dropout operation in space-constrained, battery-sensitive systems where extended runtime and reliable power sequencing are critical.
FAQ
What is the maximum input voltage rating for the LP2951CD-3.0G?
The LP2951CD-3.0G has a continuous maximum input voltage of 30 Vdc and can withstand peak transients up to 32 Vdc for durations less than 300 ms. Exceeding these ratings may cause permanent damage. For reliable operation in 24 V industrial systems, ensure input filtering limits transients within specification, and verify thermal dissipation using RJA = 180 °C/W for SOIC-8.
Does the LP2951CD-3.0G require an external pull-up resistor on the Error Output pin?
Yes, the Error Output (Pin 6) of the LP2951CD-3.0G is an open-collector NPN output and requires an external pull-up resistor to function. A value between 100 kΩ and 1.0 MΩ is recommended, typically pulled to VOUT to avoid invalid high state during power-down. Without this resistor, the error flag cannot drive logic inputs or microcontroller interrupt pins reliably.
Can the LP2951CD-3.0G be used in adjustable-output configurations?
No - the LP2951CD-3.0G is factory-configured for fixed 3.0 V output using internal resistor dividers. To achieve adjustable output (1.25 V to 29 V), select the LP2951CDR2G or LP2951ACDR2G variant and connect external resistors between Feedback (Pin 5), VO Tap (Pin 7), and Ground. The CD-3.0G variant lacks the necessary internal connections for reprogramming.
What output capacitor is required for stability with the LP2951CD-3.0G?
The LP2951CD-3.0G requires a minimum 1.0 µF output capacitor for guaranteed stability. Aluminum electrolytic, solid tantalum, or multilayer ceramic capacitors are acceptable. For operation below −25°C, solid tantalum or appropriate MLCCs are recommended. Reducing capacitance below 1.0 µF risks oscillation, especially under dynamic load conditions.
How does the Shutdown pin behave in the LP2951CD-3.0G?
The Shutdown pin (Pin 3) of the LP2951CD-3.0G is active-high: applying ≥2.0 V disables the regulator output, reducing quiescent current to ≤10 µA. At ≤0.7 V, the regulator operates normally. Input current into this pin is 35–50 µA at 2.4 V and up to 600 µA at 30 V, so drive circuitry must accommodate this load. No external pull-down is required for default-enable operation.
LP2951CD-3.0G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.45V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 120 µA
- Current - Supply (Max):
- 12 mA
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LP2951CD-3.0G FAQ
1.How can I place an order for LP2951CD-3.0G through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951CD-3.0G 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 LP2951CD-3.0G reliable?
The price and inventory of LP2951CD-3.0G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951CD-3.0G is usually 5 days.
3.What payment methods are accepted for LP2951CD-3.0G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951CD-3.0G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951CD-3.0G?
LP2951CD-3.0G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951CD-3.0G 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 LP2951CD-3.0G?
For technical support, including LP2951CD-3.0G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951CD-3.0G requirements.
6.How does Aetrix verify that LP2951CD-3.0G is sourced from the original manufacturer or authorized distributors?
All LP2951CD-3.0G 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 LP2951CD-3.0G meets industry standards.
7.What is the process for return or replacement of LP2951CD-3.0G?
All LP2951CD-3.0G units undergo pre-shipment inspection (PSI). If there is an issue with LP2951CD-3.0G, 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 LP2951CD-3.0G part is unused and in its original packaging.
Return procedure for LP2951CD-3.0G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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