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Microchip Technology LP2951-02BM
- Part No.:
- LP2951-02BM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951-02BM.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,808
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Product details
Overview
LP2951-02BM from Microchip Technology is a micropower, low-dropout linear voltage regulator with fixed 5 V output, ±0.5% initial accuracy, 40 mV typical dropout at light load, and 75 μA typical quiescent current. It integrates an error flag output for dropout warning, logic-controlled shutdown, and internal current/thermal limiting - enabling reliable operation in battery-powered automotive and avionics systems.
For engineers reviewing the LP2951-02BM datasheet, LP2951-02BM pinout, LP2951-02BM application, or LP2951-02BM equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in automotive electronics and voltage reference designs, and two technically documented alternative regulators with explicit functional and parametric differences.
Technical Context
The LP2951-02BM employs a precision bandgap reference (1.235 V nominal) and high-gain error amplifier to achieve 0.05% typical line and load regulation. Its error comparator monitors feedback voltage against the reference to assert the open-collector ERROR pin when output drops ~5% below nominal - supporting power-on reset and battery-fail detection.
Shutdown is implemented via TTL/CMOS-compatible input (2.0 V high threshold), reducing ground current to 3–10 μA in sleep mode. The device operates across –40°C to +125°C and supports both fixed 5 V output (via 5V TAP pin) and programmable output (1.24 V to 29 V) using external resistors on the FEEDBACK pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V ±0.5% (initial), stable over –40°C to +125°C - enables precision 5 V rail without external trimming. |
| Dropout Voltage | 50 mV typ. @ 100 μA; 380 mV max @ 100 mA - sustains regulation with minimal input headroom, extending battery runtime. |
| Quiescent Current | 75 μA typ.; increases only slightly in dropout - critical for always-on, low-power monitoring circuits. |
| Line & Load Regulation | 0.03% typ. line / 0.04% typ. load - minimizes output drift under varying input or load, reducing system calibration burden. |
| Error Flag Threshold | Typically 5% output drop (e.g., 250 mV at 5 V) - provides early warning of input collapse before functional failure. |
| Reference Voltage | 1.235 V ±0.5%, 20 ppm/°C tempco - usable as a stable, low-power voltage reference in sensor signal chains. |
| Shutdown Current | 3–10 μA max - ensures ultra-low standby power in wake-on-event architectures. |
Pinout & Package
LP2951-02BM is housed in an 8-pin SOIC (M) package with 1.27 mm pitch, JEDEC MS-012AC compliant, thermal resistance θJA = 160°C/W on standard FR4 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTPUT | Regulated voltage output | Delivers up to 100 mA; requires ≥1 μF ceramic capacitor for stability. |
| 2 - SENSE | Output voltage sense node | Enables remote sensing for improved load regulation; tied to OUTPUT if not used. |
| 3 - SHUTDOWN | Active-low enable control | Logic-high (≥2.0 V) enables regulation; logic-low disables output and reduces ground current to μA range. |
| 4 - GROUND | Analog and power ground reference | Common return for internal circuitry, error amplifier, and shutdown logic. |
| 5 - ERROR | Open-collector fault indicator | Pulled low when output drops ≥5% - used for power-on reset or battery low warning. |
| 6 - 5V TAP | Internal 5 V reference tap | Provides access to internal 5 V node for fixed-output configuration or feedback biasing. |
| 7 - FEEDBACK | Voltage divider input to error amp | Accepts resistor network to program output from 1.24 V to 29 V; bias current ≤40 nA. |
| 8 - INPUT | Unregulated DC input supply | Operates from 2.3 V to 30 V; minimum VIN–VOUT = 40 mV at light load. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 75 μA typical, with minimal increase in dropout - extends shelf life and runtime in coin-cell or backup-battery systems. |
| Integrated error flag comparator | Detects output droop ≥5% and asserts open-drain ERROR pin - eliminates need for external supervisor IC in power sequencing. |
| Programmable or fixed 5 V output | Pin-strappable via 5V TAP or resistor-programmable (1.24–29 V) - supports single-BOM flexibility across multiple voltage rails. |
| Tight temperature coefficient | 20 ppm/°C max output drift - meets requirements for precision analog front-ends and reference-grade instrumentation. |
| Robust protection suite | Internal current limit (160 mA typ.), thermal shutdown, and reverse-input-safe design - enhances reliability in harsh environments. |
Applications
| Automotive Body Control Module | Aerospace Power Sequencing |
|---|---|
|
Use Scenario: Regulating 5 V for microcontroller, CAN transceiver, and sensor interface in under-hood ECUs. IC Role / Device Role / Timing Role: Primary LDO providing clean, stable 5 V rail with early-warning dropout detection during cranking. Use Value: 40 mV dropout preserves regulation during 9 V cold-crank events; ERROR flag triggers ECU safe-state entry before brownout. |
Use Scenario: Powering flight-critical avionics subsystems requiring deterministic power-up timing and fault signaling. IC Role / Device Role / Timing Role: Precision 5 V reference and regulated supply with integrated POR generation via ERROR pin. Use Value: 0.5% initial accuracy and 20 ppm/°C tempco ensure ADC reference stability across –40°C to +85°C operating range. |
| Battery-Backed Memory Retention | Industrial Sensor Node |
|
Use Scenario: Maintaining SRAM or RTC voltage during main power loss using NiCd or Li-ion backup. IC Role / Device Role / Timing Role: Low-quiescent-current regulator with shutdown control to minimize backup battery drain. Use Value: 3–10 μA shutdown current extends 200 mAh backup cell life to >3 years; SENSE pin enables Kelvin sensing for accurate retention voltage. |
Use Scenario: Supplying 5 V to low-power MCU, analog sensors, and wireless transceiver in remote IoT nodes. IC Role / Device Role / Timing Role: Micropower LDO with programmable output and error flag for battery health monitoring. Use Value: 75 μA quiescent current and 5% dropout warning allow predictive battery replacement before system failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951-03BM | ±1% output tolerance, 50 ppm/°C tempco, higher ground current (100 μA typ.) | Suitable where cost sensitivity outweighs precision; less suitable for reference-grade circuits. | Select LP2951-03BM only when ±1% output accuracy and relaxed tempco meet system requirements. |
| MCP1700T-5002E/MB | Fixed 5 V, 250 mA output, 1.6 μA quiescent current, no ERROR or SHUTDOWN pins | Lacks fault signaling and enable control; optimized for ultra-low-IQ but not system supervision. | Choose MCP1700T-5002E/MB only for simple, always-on 5 V regulation without supervision needs. |
Compared with LP2951-02BM, LP2951-03BM trades precision for cost, while MCP1700T-5002E/MB sacrifices supervision features for sub-μA quiescent current - making LP2951-02BM uniquely balanced for battery-aware systems requiring both accuracy and fault awareness.
Availability
LP2951-02BM is available at Aetrix Electronics and suitable for automotive electronics, avionics power management, and precision voltage reference applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP2951-02BM 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
Microchip Technology is a global semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a strong focus on automotive, industrial, and aerospace markets.
The LP2951 product line was designed for battery-powered systems demanding ultra-low quiescent current, tight regulation, and integrated supervision - targeting automotive body electronics, avionics, and portable instrumentation.
FAQ
What is the guaranteed output voltage accuracy of the LP2951-02BM over temperature?
The LP2951-02BM guarantees ±0.5% output voltage accuracy over the full –40°C to +125°C junction temperature range. At 25°C, output is 5.000 V ±0.5% (4.975–5.025 V); over temperature, it remains within 4.940–5.060 V. This specification is tighter than the LP2951-03BM (±1%) and directly supports precision analog and reference applications where drift must be minimized.
How does the ERROR pin function in the LP2951-02BM, and what triggers it?
The ERROR pin on the LP2951-02BM is an open-collector output that goes low when the regulated output drops approximately 5% below nominal (e.g., <4.75 V for 5 V output). This occurs due to input dropout, overload, or thermal shutdown. The threshold is referenced to the internal 1.235 V bandgap and remains proportional to programmed output voltage - enabling reliable early-warning signaling without external components.
Can the LP2951-02BM be used as a precision voltage reference, and what is its reference voltage spec?
Yes, the LP2951-02BM can serve as a precision voltage reference via its internal 1.235 V bandgap (1.220–1.250 V, ±0.5%). With 20 ppm/°C temperature coefficient and 0.05% load regulation, it delivers stable reference performance suitable for ADCs, DACs, and sensor excitation. Its low 75 μA quiescent current further supports low-power reference designs where traditional references draw more current.
What is the minimum input-to-output voltage differential required for regulation in the LP2951-02BM?
The LP2951-02BM achieves regulation with as little as 40 mV input-to-output differential at light loads (100 μA), and 380 mV maximum at full 100 mA load. This ultra-low dropout enables operation from weak or aging batteries - for example, maintaining 5 V output even when input sags to 5.38 V at full load - significantly extending usable battery capacity in portable systems.
Does the LP2951-02BM support remote voltage sensing, and how is it implemented?
Yes, the LP2951-02BM supports remote sensing via the SENSE pin (Pin 2). When connected to the load side of PCB traces or connectors, it compensates for IR drop, improving load regulation accuracy. If unused, SENSE must be tied directly to OUTPUT. This feature is critical in automotive and avionics applications where wiring resistance introduces significant voltage loss between regulator and load.
LP2951-02BM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 1.24V (5V)
- Voltage - Output (Max):
- 29V
- Voltage Dropout (Max):
- 0.6V @ 100mA
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 14 mA
- PSRR:
- -
- Control Features:
- Enable, Error Flag
- Protection Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LP2951-02BM FAQ
1.How can I place an order for LP2951-02BM through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951-02BM 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 LP2951-02BM reliable?
The price and inventory of LP2951-02BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951-02BM is usually 5 days.
3.What payment methods are accepted for LP2951-02BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951-02BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951-02BM?
LP2951-02BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951-02BM 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 LP2951-02BM?
For technical support, including LP2951-02BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951-02BM requirements.
6.How does Aetrix verify that LP2951-02BM is sourced from the original manufacturer or authorized distributors?
All LP2951-02BM 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 LP2951-02BM meets industry standards.
7.What is the process for return or replacement of LP2951-02BM?
All LP2951-02BM units undergo pre-shipment inspection (PSI). If there is an issue with LP2951-02BM, 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 LP2951-02BM part is unused and in its original packaging.
Return procedure for LP2951-02BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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