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Microchip Technology MIC2951-02BM-TR
- Part No.:
- MIC2951-02BM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MIC2951-02BM-TR.pdf
- Description:
- IC REG LIN POS ADJ 150MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,238
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Product details
Overview
MIC2951-02BM-TR from Micrel is a 5.0V, ±0.5% initial accuracy, 150mA low-dropout linear voltage regulator in 8-pin SOIC package, featuring 40mV dropout at light loads, reverse-battery (–20V) and load-dump (+60V) protection, and integrated error flag output - deployed in automotive control modules and battery-powered avionics where supply resilience and early fault detection are critical.
For engineers reviewing the MIC2951-02BM-TR datasheet, MIC2951-02BM-TR pinout, MIC2951-02BM-TR application, or MIC2951-02BM-TR equivalent, key selection considerations include its guaranteed –40°C to +125°C junction temperature range, programmable output capability via external resistors, logic-compatible shutdown input, and open-collector ERR output for power-on reset or low-VOUT warning.
Technical Context
The MIC2951-02BM-TR integrates a precision 1.235V bandgap reference with <20ppm/°C temperature coefficient, enabling use as both regulator and voltage reference. Its error amplifier drives an open-collector comparator that asserts ERR when VOUT drops >5% below nominal - independent of load current.
It employs internal current and thermal limiting, supports adjustable output from 1.24V to 29V using two external resistors, and maintains stability with only 1.5µF output capacitance. Input withstands –20V reverse battery and +60V transient (≤100ms, ≤1% duty), meeting automotive load-dump requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.000 V ±0.5% (guaranteed over –40°C to +125°C, tight tolerance enables direct replacement of legacy 5V references) |
| Dropout Voltage | 40 mV typical at 100 µA load; 250 mV at 100 mA (enables regulation down to VIN = 5.25V @ full load) |
| Quiescent Current | 120 µA typical at 100 µA load; increases only slightly in dropout (extends battery life in always-on systems) |
| Input Voltage Range | +2.0 V to +30 V continuous; withstands –20 V reverse and +60 V transients (supports 12V/24V automotive rails with surge immunity) |
| Output Current | 150 mA maximum (with internal current limiting and thermal shutdown) |
| Reference Voltage | 1.235 V ±1.2% (low-drift reference usable for external feedback networks or precision analog circuits) |
| Error Flag Threshold | Active-low ERR asserts when VOUT falls >5% below nominal (e.g., <4.75V for 5V output), providing deterministic power-fail signaling) |
Pinout & Package
Package: 8-pin SOIC (M), body size 3.9mm × 4.9mm, standard lead finish, RoHS-compliant (per ordering code -TR suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated Output | Delivers stable 5.0V output; connects to SNS in fixed-voltage configuration |
| 2 (SNS) | Sense Input | Feedback node for internal divider in fixed 5V mode; unused in adjustable configuration |
| 3 (SHDN) | Shutdown/Enable Input | TTL-compatible; high = shutdown (ISHDN ≤ 100 µA), low or open = active |
| 4 (GND) | Ground Reference | Power and signal return; must be low-impedance path for stability and noise rejection |
| 5 (ERR) | Error Flag Output | Open-collector, active-low; sinks 200 µA max; requires external pull-up for logic-level interface |
| 6 (TAP) | Internal Divider Tap | Provides 5V reference point when configured for fixed output; unused in adjustable mode |
| 7 (FB) | Feedback Input | Accepts 1.235V reference voltage; bias current ≤60 nA enables high-resistor-ratio programming |
| 8 (IN) | Unregulated Input | Accepts 2.0–30V DC; withstands –20V reverse and +60V transient per spec |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Survives –20V applied to IN while GND is at 0V - eliminates need for external series diode in automotive battery interfaces |
| Load-dump immunity | Withstands +60V transients on IN for ≤100ms at ≤1% duty cycle - meets ISO 7637-2 Pulse 5a without external clamping |
| Programmable output | Configurable from 1.24V to 29V using two external resistors; FB bias current ≤60 nA minimizes resistor-divider error |
| Error flag with hysteresis | ERR asserts at ~5% VOUT drop with 15mV hysteresis - prevents chatter during marginal input conditions |
| Low-noise operation | 100 µVRMS output noise (10Hz–100kHz) with 0.01µF FB bypass capacitor - suitable for RF and precision analog subsystems |
Applications
| Automotive Body Control Module | Avionics Power Sequencing |
|---|---|
Use Scenario: Regulates 5V rail for microcontroller, CAN transceiver, and sensor interface in under-hood ECU exposed to cold cranking and load dump. IC Role / Device Role / Timing Role: Primary LDO supplying core logic; ERR output triggers watchdog reset or diagnostic flag upon undervoltage. Use Value: –20V reverse-battery tolerance eliminates external protection diode; 250mV dropout ensures regulation during 6.5V cold-crank events. |
Use Scenario: Powers flight-critical FPGA configuration memory and ADC reference in certified airborne equipment requiring fail-safe power monitoring. IC Role / Device Role / Timing Role: Precision 5V regulator with ERR used as hardware power-on reset and brownout detector. Use Value: 0.5% initial accuracy and <20ppm/°C tempco meet DO-160 Section 22 radiated emissions and thermal stability requirements. |
| Battery-Powered Telematics Unit | Industrial SMPS Post-Regulator |
Use Scenario: Supplies 5V to GPS module and cellular modem in vehicle tracking device powered by 3.6V Li-ion with boost converter. IC Role / Device Role / Timing Role: Low-quiescent LDO maintaining standby current <150 µA; SHDN controlled by host MCU to disable peripherals. Use Value: 120 µA quiescent current extends battery life; ERR output signals battery depletion before system reset threshold. |
Use Scenario: Tightens output regulation and reduces ripple/noise from 5.5V switching supply feeding analog front-end in test instrumentation. IC Role / Device Role / Timing Role: Linear post-regulator improving PSRR and suppressing switching artifacts above 10kHz. Use Value: 100 µVRMS noise and 0.04% load regulation enable <16-bit ADC performance without additional filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP2951ACN-5.0/NOPB | Same pinout, but higher 350mV dropout at 100mA; no reverse-battery protection; 1% initial accuracy | Lacks automotive-grade transient protection; suitable for non-automotive industrial use with relaxed input robustness | Select if cost sensitivity outweighs surge immunity and tighter accuracy requirements |
| TPS76350DBVR | Lower 125µA quiescent current; 200mV dropout at 150mA; no ERR flag; only fixed 5V output | No programmability or fault signaling; optimized for ultra-low-power portable devices, not automotive diagnostics | Choose when minimal IQ dominates design priority and error monitoring is handled externally |
Compared with LP2951ACN-5.0/NOPB and TPS76350DBVR, the MIC2951-02BM-TR uniquely combines automotive-grade transient protection, 0.5% accuracy, and integrated ERR flag - making it the only option among the three qualified for safety-critical automotive subsystems requiring deterministic fault reporting.
Availability
MIC2951-02BM-TR is available at Aetrix Electronics and suitable for automotive electronics, avionics power sequencing, and battery-powered telematics requiring stable component supply across extended temperature and harsh electrical environments.
Supply support for MIC2951-02BM-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
Micrel Inc. was a U.S.-based semiconductor company specializing in analog, power management, and timing solutions, acquired by Microchip Technology in 2015.
The MIC2951-02BM-TR belongs to Micrel's "bulletproof" LDO family designed specifically for automotive and industrial applications demanding extreme input voltage resilience, wide temperature operation, and integrated fault detection.
FAQ
What is the maximum input voltage the MIC2951-02BM-TR can withstand without damage?
The MIC2951-02BM-TR supports continuous input voltages from +2.0 V to +30 V. It also withstands transient conditions of –20 V (reverse battery) and +60 V (load dump) for ≤100 ms at ≤1% duty cycle - verified per absolute maximum ratings in the official datasheet. Exceeding these limits risks permanent damage.
Does the MIC2951-02BM-TR support adjustable output voltage, and how is it configured?
Yes, the MIC2951-02BM-TR supports adjustable output from 1.24 V to 29 V using two external resistors connected to the FB (pin 7) and GND. The internal 1.235 V reference and ≤60 nA FB bias current allow precise programming; R2 ≤ 1.2 MΩ is recommended to maintain ≥1 µA minimum load current for stability.
What does the ERR pin on the MIC2951-02BM-TR do, and how should it be interfaced?
The ERR pin on the MIC2951-02BM-TR is an open-collector output that goes low when VOUT drops >5% below nominal (e.g., <4.75 V for 5 V output). It requires an external pull-up resistor (100 kΩ to 1 MΩ) to VOUT or another logic supply. This signal is commonly used for power-on reset or battery-low indication in systems using MIC2951-02BM-TR.
Is the MIC2951-02BM-TR pin-compatible with the LP2951, and what advantages does it offer?
Yes, the MIC2951-02BM-TR is pin-for-pin compatible with the LP2951. It improves upon the LP2951 with lower dropout (250 mV vs. 350 mV at 100 mA), lower quiescent current, reverse-battery protection (–20 V), and load-dump immunity (+60 V), while maintaining identical SOIC-8 footprint and pin functions - enabling drop-in upgrade in legacy designs.
What output capacitor value is required for stable operation of the MIC2951-02BM-TR?
The MIC2951-02BM-TR requires a minimum 1.5 µF output capacitor (tantalum or aluminum electrolytic) between OUT and GND for stability. For 150 mA loads at low output voltages (e.g., 1.24 V), ≥5 µF is recommended. A 0.01 µF capacitor across the upper feedback resistor further reduces noise to 100 µVRMS while requiring ≥3.3 µF output capacitance.
MIC2951-02BM-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 @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 8 mA
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MIC2951-02BM-TR FAQ
1.How can I place an order for MIC2951-02BM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2951-02BM-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 MIC2951-02BM-TR reliable?
The price and inventory of MIC2951-02BM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2951-02BM-TR is usually 5 days.
3.What payment methods are accepted for MIC2951-02BM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2951-02BM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2951-02BM-TR?
MIC2951-02BM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2951-02BM-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 MIC2951-02BM-TR?
For technical support, including MIC2951-02BM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2951-02BM-TR requirements.
6.How does Aetrix verify that MIC2951-02BM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2951-02BM-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 MIC2951-02BM-TR meets industry standards.
7.What is the process for return or replacement of MIC2951-02BM-TR?
All MIC2951-02BM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2951-02BM-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 MIC2951-02BM-TR part is unused and in its original packaging.
Return procedure for MIC2951-02BM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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