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Microchip Technology LP2951-03BM
- Part No.:
- LP2951-03BM
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951-03BM.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,276
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Product details
Overview
LP2951-03BM from Microchip Technology is a micropower, low-dropout linear voltage regulator with fixed 5 V output, ±1% initial accuracy, 100 mA output capability, and 75 μA typical quiescent current - designed for battery-powered automotive and avionics systems where extended runtime and early dropout warning are critical.
For engineers reviewing the LP2951-03BM datasheet, LP2951-03BM pinout, LP2951-03BM application, or LP2951-03BM equivalent, this page delivers verified electrical specs, validated SOIC-8 pin functions, real-world use cases in battery monitoring and precision reference circuits, and two confirmed alternative regulators with documented functional trade-offs.
Technical Context
The LP2951-03BM integrates a precision 1.235 V bandgap reference, error amplifier, PNP pass transistor, and dedicated error flag comparator with 5% typical dropout detection hysteresis. Its ground current rises only marginally in dropout (from 75 μA to ~12 mA at 100 mA load), preserving battery life.
It supports dual operating modes: fixed 5 V output via internal 5V TAP pin connection, or adjustable 1.24–29 V output using external feedback resistors. The logic-compatible shutdown input accepts TTL/CMOS levels (0.7 V low / 2.0 V high) and reduces output leakage to ≤10 μA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V ±1% (guaranteed over –40°C to +125°C junction temp) |
| Max Output Current | 100 mA - sufficient for microcontrollers, sensors, and analog front-ends in space-constrained modules |
| Dropout Voltage | 380 mV at 100 mA - enables regulation from 5.38 V input when delivering full load |
| Quiescent Current | 75 μA typical - extends battery life in always-on monitoring circuits |
| Reference Voltage | 1.235 V ±1% - stable internal reference usable as precision voltage source for ADCs or comparators |
| Error Flag Threshold | Detects ≥5% output drop (e.g., 250 mV at 5 V out) - provides reliable early-warning signal for battery depletion |
| Shutdown Current | ≤10 μA - ensures negligible drain during system sleep states |
Pinout & Package
LP2951-03BM is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm pitch, JEDEC MS-012AC compliant footprint, and thermal resistance θJA = 160°C/W on 1″² copper-clad FR4 board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTPUT | Regulated power output | Delivers stable 5 V to load; requires ≥1 μF ceramic capacitor for stability |
| 2 - SENSE | Output voltage sensing node | Enables remote-sense compensation for PCB trace IR drop in precision applications |
| 3 - SHUTDOWN | Active-low enable control | Drives low (≤0.7 V) to disable regulator; draws ≤600 μA at 30 V input |
| 4 - GROUND | Analog and power ground reference | Must be connected to low-impedance ground plane; separates from digital ground if noise-sensitive |
| 5 - ERROR | Open-collector fault indicator | Sinks ≥200 μA when output drops ≥5%; used for power-on reset or battery-low signaling |
| 6 - 5V TAP | Internal 5 V reference tap | Connects to FEEDBACK pin for fixed 5 V mode; not intended as standalone output |
| 7 - FEEDBACK | Voltage divider input for regulation loop | Accepts 20–40 nA bias current; sets output voltage in adjustable mode (1.24–29 V) |
| 8 - INPUT | Unregulated DC input supply | Operates from 2.3 V to 30 V; minimum headroom defined by dropout voltage vs. load |
Key Features
| Feature | Design Value |
|---|---|
| Low-dropout operation | 380 mV at 100 mA enables use with single-cell Li-ion or 6 V lead-acid batteries near end-of-discharge |
| Integrated error flag | Dedicated open-collector output warns of output dropout before system reset - eliminates need for external supervisor IC |
| Programmable output | Configurable 1.24–29 V output via two external resistors - supports diverse rail requirements without redesign |
| Tight temperature coefficient | 50 ppm/°C max reference drift - maintains <0.1% output error across –40°C to +125°C |
| Logic-compatible shutdown | CMOS/TTL-level input allows direct interface with microcontroller GPIO - no level-shifting required |
Applications
| Automotive Battery Monitoring | Aerospace Power Sequencing |
|---|---|
|
Use Scenario: Real-time monitoring of 12 V vehicle battery health during engine cranking and accessory loads. IC Role / Device Role / Timing Role: Primary 5 V regulator supplying MCU and CAN transceiver; ERROR pin triggers low-battery alert before brownout. Use Value: 380 mV dropout ensures continued operation down to 5.38 V input; 75 μA quiescent current minimizes parasitic drain during ignition-off state. |
Use Scenario: Controlled power-up sequence for flight-critical avionics subsystems requiring deterministic reset timing. IC Role / Device Role / Timing Role: Regulator with integrated ERROR flag acting as hardware-based power-on reset generator for FPGA configuration. Use Value: Error flag asserts within 10 μs of output deviation >5%, enabling sub-millisecond reset assertion without software dependency. |
| Industrial Sensor Node Reference | Medical Portable Device Power |
|
Use Scenario: Precision analog front-end for thermocouple or strain-gauge measurement in battery-operated field instruments. IC Role / Device Role / Timing Role: Dual-role device: 5 V supply for signal chain + 1.235 V reference for 24-bit delta-sigma ADC. Use Value: 50 ppm/°C reference TC and 0.05% load regulation reduce measurement drift to <0.01% FS over temperature and load variation. |
Use Scenario: Long-life portable diagnostic equipment (e.g., handheld ECG) powered by rechargeable LiPo cells. IC Role / Device Role / Timing Role: Main system regulator with programmable shutdown to extend standby time between clinical sessions. Use Value: Shutdown current ≤10 μA enables >1-year shelf life; 100 mA output supports simultaneous display backlight and Bluetooth LE radio burst transmission. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951-02BM | ±0.5% output tolerance and 20 ppm/°C reference TC vs. ±1% / 50 ppm/°C for LP2951-03BM | Better suited for metrology-grade references or high-accuracy sensor excitation where <0.1% total error budget is required | Select LP2951-02BM when tighter initial accuracy and lower drift outweigh cost sensitivity |
| MCP1826S-5002E/DB | 5 V fixed output, 300 mA rating, 220 μA quiescent current, no ERROR flag or SENSE pin | Lacks early-warning capability and remote sensing - suitable for non-critical consumer electronics with higher current demand | Choose MCP1826S-5002E/DB only when higher output current is mandatory and fault signaling is handled externally |
Compared with LP2951-02BM and MCP1826S-5002E/DB, the LP2951-03BM uniquely balances moderate accuracy (±1%), ultra-low quiescent current (75 μA), integrated error flag, and remote sense - making it optimal for automotive and avionics battery-monitoring systems where reliability, longevity, and early-failure detection are jointly prioritized.
Availability
LP2951-03BM is available at Aetrix Electronics and suitable for automotive battery management, avionics power sequencing, and industrial sensor node designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP2951-03BM 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 Inc. is a leading provider of microcontrollers, analog devices, and connectivity solutions, serving automotive, industrial, and aerospace markets with high-reliability silicon.
The LP2951 product line delivers micropower, low-dropout regulators with integrated supervision features - engineered specifically for mission-critical battery-powered systems demanding extended runtime and deterministic fault response.
FAQ
What is the guaranteed output voltage tolerance for LP2951-03BM over temperature?
The LP2951-03BM guarantees ±1% output voltage tolerance over the full –40°C to +125°C junction temperature range. At 25°C, typical output is 5.000 V with min/max bounds of 4.950 V and 5.050 V. This specification is validated per Microchip DS20005736A, page 5, Table 1-1.
Can LP2951-03BM be used in adjustable-output configurations?
Yes, LP2951-03BM supports adjustable output from 1.24 V to 29 V using external resistors on the FEEDBACK pin. The internal 1.235 V reference is accessible, and the error amplifier gain is set by the resistor divider ratio. Fixed 5 V operation uses the internal 5V TAP pin tied to FEEDBACK.
How does the ERROR pin function in LP2951-03BM?
The ERROR pin is an open-collector output that pulls low when the regulated output drops ≥5% below nominal (e.g., <4.75 V for 5 V output). It sinks ≥200 μA and is commonly used for power-on reset generation or battery-low warning. Hysteresis is built-in to prevent chatter near threshold.
What is the minimum input voltage required for LP2951-03BM to regulate at 100 mA?
At 100 mA load, LP2951-03BM requires a minimum input voltage of 5.38 V (5.00 V + 380 mV dropout). The datasheet specifies 380 mV typical dropout at 100 mA (DS20005736A, page 7), and absolute minimum input is 2.3 V over temperature - but regulation is only possible above dropout headroom.
Is LP2951-03BM pin-compatible with other LP2951 variants?
Yes, all LP2951 variants including LP2951-02BM, LP2951-03BM, and LP2951-4.8BM share identical SOIC-8 pinout and package dimensions. Only electrical specifications (tolerance, TC, line/load regulation) differ - allowing drop-in replacement where performance margins permit.
LP2951-03BM 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
LP2951-03BM FAQ
1.How can I place an order for LP2951-03BM through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951-03BM 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 LP2951-03BM reliable?
The price and inventory of LP2951-03BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP2951-03BM is usually 5 days.
3.What payment methods are accepted for LP2951-03BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951-03BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951-03BM?
LP2951-03BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951-03BM 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 LP2951-03BM?
For technical support, including LP2951-03BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951-03BM requirements.
6.How does Aetrix verify that LP2951-03BM is sourced from the original manufacturer or authorized distributors?
All LP2951-03BM 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 LP2951-03BM meets industry standards.
7.What is the process for return or replacement of LP2951-03BM?
All LP2951-03BM units undergo pre-shipment inspection (PSI). If there is an issue with LP2951-03BM, 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 LP2951-03BM part is unused and in its original packaging.
Return procedure for LP2951-03BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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