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Microchip Technology LP2951-03BM-TR
- Part No.:
- LP2951-03BM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP2951-03BM-TR.pdf
- Description:
- IC REG LIN POS ADJ 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,670
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Product details
Overview
LP2951-03BM-TR from Microchip Technology is a micropower, low-dropout linear voltage regulator with fixed 5 V output (±1% tolerance), 100 mA rated output current, and ultra-low quiescent current (75 μA typical). It features logic-controlled shutdown, an error flag output for dropout detection, and operates across –40°C to +125°C - ideal for automotive battery-supplied systems requiring stable 5 V rail under varying load and input conditions.
For engineers reviewing the LP2951-03BM-TR datasheet, LP2951-03BM-TR pinout, LP2951-03BM-TR application, or LP2951-03BM-TR equivalent, key selection criteria include dropout voltage at 100 mA (≤450 mV), output voltage temperature coefficient (≤150 ppm/°C), error flag threshold accuracy (±15 mV hysteresis), shutdown input compatibility with TTL/CMOS logic, and SOIC-8 package suitability for space-constrained automotive PCBs.
Technical Context
The LP2951-03BM-TR integrates a precision 1.235 V bandgap reference, error amplifier, PNP pass transistor, and dedicated error comparator with hysteresis. Its architecture enables operation in both fixed-output (via internal 5 V tap) and adjustable modes (1.24 V to 29 V using external resistors), while maintaining tight line regulation (≤0.20%) and load regulation (≤0.20%) over full temperature and load range.
Shutdown is asserted when the SHUTDOWN pin exceeds 2.0 V (high), reducing output current to ≤10 μA; the ERROR pin asserts low (≤400 mV) when output drops ≥5% below nominal, supporting power-on reset and battery health monitoring. Thermal and current limiting protect against fault conditions without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V ±1% (guaranteed over –40°C to +125°C; supports precision 5 V rail for MCU peripherals) |
| Max Output Current | 100 mA (sustained; sufficient for microcontrollers, sensors, and interface ICs in automotive modules) |
| Dropout Voltage | 380 mV typical at 100 mA (enables regulation down to VIN = 5.38 V; extends battery runtime) |
| Quiescent Current | 75 μA typical (low standby drain; critical for always-on vehicle subsystems) |
| Line Regulation | 0.20% max (ensures stable output despite alternator ripple or battery voltage fluctuations) |
| Load Regulation | 0.30% max (maintains accuracy across 100 μA–100 mA load swing) |
| Temp Coefficient | 150 ppm/°C max (supports use as system voltage reference in avionics-grade designs) |
| Error Flag Threshold | 5% output drop (±15 mV hysteresis); triggers at ~4.75 V output for early warning of battery depletion |
Pinout & Package
LP2951-03BM-TR is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard JEDEC MS-012AC footprint (5.3 mm × 4.4 mm, 1.27 mm pitch), optimized for automated assembly and thermal performance on FR4 PCBs (θJA = 160°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUTPUT | Regulated output node | Delivers stable 5 V to load; requires ≥1 μF ceramic capacitor for stability |
| 2 - SENSE | Output voltage sense point | Enables remote sensing to compensate for PCB trace IR drop; tied to OUTPUT in standard config |
| 3 - SHUTDOWN | Logic enable/disable control | Active-high TTL/CMOS-compatible input; ≥2.0 V enables regulator, ≤0.7 V disables output |
| 4 - GROUND | Analog and power ground reference | Common return for internal circuitry; must be low-impedance connection to minimize noise |
| 5 - ERROR | Open-collector fault indicator | Asserts low when output drops ≥5%; used for power-on reset or battery low warning |
| 6 - 5V TAP | Internal 5 V reference node | Provides access to internal bandgap-derived 5 V; used for feedback in fixed-mode configuration |
| 7 - FEEDBACK | Adjustable output voltage control | Connects to resistor divider for programmable outputs; also monitors output for ERROR comparator |
| 8 - INPUT | Unregulated DC input supply | Accepts 2.3 V to 30 V; minimum headroom defined by dropout voltage at load current |
Key Features
| Feature | Design Value |
|---|---|
| Low-dropout operation | 380 mV max at 100 mA enables use with weak or aging batteries in automotive environments |
| Integrated error flag | Dedicated open-collector ERROR output provides precise, hysteresis-stabilized dropout detection without external comparators |
| Logic-controlled shutdown | CMOS/TTL-compatible SHUTDOWN pin reduces quiescent current to ≤10 μA for zero-power sleep states |
| Wide input voltage range | 2.3 V to 30 V operation accommodates cold-crank (≥4.5 V) and load-dump (≤30 V) transients per ISO 7637-2 |
| Stability with minimal capacitance | Stable with only 1 μF output capacitor - reduces BOM count and board area vs. legacy LDOs requiring ≥10 μF |
| High-accuracy reference | 1.235 V ±1% internal reference with 150 ppm/°C TC supports precision analog functions and sensor biasing |
Applications
| Automotive Body Control Module | Avionics Power Sequencing |
|---|---|
Use Scenario: Regulating 5 V supply for door lock actuators, window lift motors, and interior lighting controllers in 12 V vehicle electrical systems. IC Role / Device Role / Timing Role: Primary 5 V LDO delivering clean, regulated power with early-warning dropout detection during engine cranking. Use Value: Maintains MCU and peripheral operation down to VIN = 5.38 V; ERROR flag triggers fail-safe state transition before brownout. | Use Scenario: Providing tightly regulated 5 V bias for flight-critical ADCs, pressure transducers, and communication interfaces in certified avionics units. IC Role / Device Role / Timing Role: Precision voltage reference and regulator with <150 ppm/°C drift, meeting DO-160E temperature and stability requirements. Use Value: Eliminates need for external reference IC; output stability ensures <0.1% measurement error across –40°C to +85°C operational envelope. |
| Battery-Backed Memory System | Industrial Sensor Node |
Use Scenario: Powering SRAM and real-time clock circuits during main power loss, using NiCd backup battery. IC Role / Device Role / Timing Role: Dual-role regulator/reference enabling seamless switchover and accurate voltage monitoring for battery health assessment. Use Value: ERROR flag latches off main regulator when VIN drops below 5.3 V, preserving backup battery charge for >72 hours of RTC operation. | Use Scenario: Supplying 5 V to low-power wireless sensor nodes deployed in remote industrial sites with wide ambient temperature swings. IC Role / Device Role / Timing Role: Micropower LDO with 75 μA quiescent current and –40°C to +125°C rating for long-life battery operation. Use Value: Extends 2×AA battery life to >5 years in sleep mode; shutdown pin enables firmware-controlled deep-sleep cycles. |
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 |
|---|---|---|---|
| LP2951-02BM-TR | Tighter initial output tolerance (±0.5% vs. ±1%) and lower tempco (100 ppm/°C vs. 150 ppm/°C) | Better suited for high-precision reference applications where absolute voltage accuracy is critical | Select LP2951-02BM-TR when system-level calibration or sensor excitation demands <0.5% output error over temperature |
| TPS76350DBVR | Lower quiescent current (17 μA vs. 75 μA), but higher dropout (250 mV at 100 mA) and narrower input range (2.7–10 V) | Limited to low-voltage battery systems; lacks ERROR flag and 5 V tap functionality | Choose TPS76350DBVR only for ultra-low-power portable devices where input never exceeds 10 V and fault signaling is handled externally |
Compared with LP2951-02BM-TR, the LP2951-03BM-TR trades minor accuracy for broader availability and cost efficiency in automotive body electronics; versus TPS76350DBVR, it delivers superior fault diagnostics, wider input range, and true 5 V reference capability - essential for robust vehicle subsystem design.
Availability
LP2951-03BM-TR is available at Aetrix Electronics and suitable for automotive electronics, avionics power sequencing, and industrial sensor node designs requiring stable component supply, extended temperature operation, and integrated fault monitoring.
Supply support for LP2951-03BM-TR 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 memory products for embedded control applications.
The LP2951 product line delivers micropower, low-dropout regulators with integrated diagnostics for automotive, industrial, and aerospace systems where reliability, wide input range, and battery longevity are critical.
FAQ
What is the guaranteed output voltage tolerance for LP2951-03BM-TR over temperature?
The LP2951-03BM-TR guarantees ±1% output voltage tolerance over the full operating junction temperature range of –40°C to +125°C, with typical output voltage of 5.000 V at 25°C. This specification is validated per Microchip's DS20005736A datasheet Section 1.0 Electrical Characteristics, ensuring consistent 5 V rail performance in automotive under-hood environments.
Can LP2951-03BM-TR be used in adjustable-output configurations?
Yes, the LP2951-03BM-TR supports adjustable output voltages from 1.24 V to 29 V using two external resistors connected to the FEEDBACK pin. Its internal 1.235 V reference and high-impedance feedback input (bias current ≤40 nA) enable precise programming while maintaining low quiescent current - a capability confirmed in the General Description and Typical Application Diagrams of the LP2951 datasheet.
What is the minimum input voltage required for LP2951-03BM-TR to maintain regulation at 100 mA load?
At 100 mA load, the LP2951-03BM-TR requires a minimum input-to-output differential of 450 mV (max dropout voltage per datasheet). With a nominal 5.000 V output, the minimum input voltage is therefore 5.45 V. This value is derived directly from the Dropout Voltage specification (380 mV typical, 450 mV max at 100 mA) in DS20005736A-page 7.
How does the ERROR pin function in LP2951-03BM-TR, and what is its threshold accuracy?
The ERROR pin is an open-collector output that goes low when the regulated output drops ≥5% below nominal (i.e., ≤4.75 V for 5 V output), with ±15 mV hysteresis. As specified in DS20005736A-page 9, this threshold remains proportional to VOUT in adjustable configurations and provides reliable early-warning signaling for battery depletion or input faults - no external components needed.
Is LP2951-03BM-TR qualified for automotive applications, and what temperature range does it support?
Yes, the LP2951-03BM-TR is qualified for automotive use with guaranteed operation from –40°C to +125°C junction temperature, per the Absolute Maximum Ratings and Electrical Characteristics tables in DS20005736A. Its SOIC-8 package, integrated protection features (thermal/current limiting), and AEC-Q100 alignment make it suitable for body control, infotainment, and telematics modules.
LP2951-03BM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-TR FAQ
1.How can I place an order for LP2951-03BM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP2951-03BM-TR 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-TR reliable?
The price and inventory of LP2951-03BM-TR 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-TR is usually 5 days.
3.What payment methods are accepted for LP2951-03BM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP2951-03BM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP2951-03BM-TR?
LP2951-03BM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP2951-03BM-TR 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-TR?
For technical support, including LP2951-03BM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP2951-03BM-TR requirements.
6.How does Aetrix verify that LP2951-03BM-TR is sourced from the original manufacturer or authorized distributors?
All LP2951-03BM-TR 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-TR meets industry standards.
7.What is the process for return or replacement of LP2951-03BM-TR?
All LP2951-03BM-TR units undergo pre-shipment inspection (PSI). If there is an issue with LP2951-03BM-TR, 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-TR part is unused and in its original packaging.
Return procedure for LP2951-03BM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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