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Microchip Technology MIC2951-3.3BMM-TR
- Part No.:
- MIC2951-3.3BMM-TR
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC2951-3.3BMM-TR.pdf
- Description:
- IC REG LIN POS ADJ 150MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,880
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Product details
Overview
MIC2951-3.3BMM-TR from Micrel is a 150mA, 3.3V fixed-output low-dropout linear voltage regulator in an 8-pin MSOP package, featuring 1.0% output voltage accuracy over –40°C to +125°C, 40mV typical dropout at light load, and reverse-battery (–20V) and load-dump (+60V) protection - deployed in automotive body control modules and battery-powered industrial sensors.
For engineers reviewing the MIC2951-3.3BMM-TR datasheet, MIC2951-3.3BMM-TR pinout, MIC2951-3.3BMM-TR application, or MIC2951-3.3BMM-TR equivalent, key selection criteria include dropout behavior under 150mA load, error flag timing for low-VOUT detection, shutdown logic compatibility, thermal regulation at 0.20%/W, and stability with ≥1.5µF output capacitance.
Technical Context
The MIC2951-3.3BMM-TR integrates a precision 1.235V bandgap reference, error amplifier, open-collector error flag comparator, and TTL-compatible shutdown input - all operating from an unregulated input of +2.0V to +30V DC. Its feedback architecture supports both fixed 3.3V operation (via internal divider) and adjustable outputs (1.24V–29V) using external resistors.
It employs current-limiting and thermal-foldback protection, with dropout defined as the VIN–VOUT differential causing VOUT to drop 100mV below nominal. At 150mA, dropout is 320–450mV (typ–max), and ground current rises only to 4–10mA - enabling extended battery life in always-on systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300 V ±1.0% (3.267–3.333 V) over full temperature and load range - ensures stable MCU I/O rail compliance in automotive ECUs. |
| Max Output Current | 150 mA continuous - sufficient to power microcontrollers, CAN transceivers, and analog front-ends without external pass devices. |
| Dropout Voltage | 40 mV (typ, 100 µA), 320–450 mV (max, 150 mA) - enables regulation down to VIN = 3.62 V at full load, critical for cold-crank automotive scenarios. |
| Quiescent Current | 100–300 µA (light load), 4–10 mA (150 mA) - minimizes standby drain in battery-backed systems like telematics modules. |
| Input Voltage Range | +2.0 V to +30 V DC continuous; withstands –20 V reverse battery and +60 V/100 ms load dump - eliminates need for external TVS or polarity protection. |
| Error Flag Threshold | Active-low open-collector output trips when VOUT drops ~5% below nominal (≈165 mV at FB pin) - provides reliable early-warning signal for battery monitoring or power-on reset. |
| Thermal Regulation | 0.05–0.20 %/W - limits output drift during transient power dissipation, essential for precision sensor biasing in engine control units. |
Pinout & Package
Package: 8-pin MSOP (MM8®), 3.0 mm × 3.0 mm × 0.85 mm body, 0.65 mm pitch, exposed pad (not electrically connected). Thermal resistance θJA = 250°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Regulated Output | Delivers stable 3.3V to load; requires ≥1.5 µF ceramic/tantalum capacitor to ground for stability. |
| 2 (SNS) | Sense Input | Connects to OUT in fixed 3.3V mode; senses regulated output to close feedback loop internally. |
| 3 (SHDN) | Shutdown Enable | TTL-compatible input: <0.7 V = enable, >2.0 V = shutdown; draws ≤100 µA in shutdown state. |
| 4 (GND) | Ground Reference | Power and signal return path; must be low-impedance to minimize noise coupling into FB and ERR pins. |
| 5 (ERR) | Error Flag Output | Open-collector, active-low; sinks up to 200 µA; requires external pull-up (100 kΩ–1 MΩ) to VOUT or another supply. |
| 6 (TAP) | Internal Divider Tap | Provides 3.3V reference point for fixed-mode operation; unused in adjustable configurations. |
| 7 (FB) | Feedback Input | Accepts 1.235 V reference voltage; bias current ≤60 nA; sensitive to stray capacitance - bypass with 100 pF if high-R dividers used. |
| 8 (IN) | Unregulated Input | Accepts 2.0–30 V DC; must include 0.1 µF ceramic capacitor to GND if >10" wire length or battery source present. |
Key Features
| Feature | Design Value |
|---|---|
| Bulletproof transient protection | Withstands –20 V reverse battery and +60 V/100 ms load dump without external components - reduces BOM count in automotive designs. |
| Low-dropout operation | 40 mV typical dropout at 100 µA enables regulation from 3.34 V input - extends usable battery voltage range in Li-ion or 3-cell alkaline systems. |
| Integrated error flag | Open-collector ERR pin asserts low when VOUT falls >5% below nominal - replaces discrete supervisor ICs for power-good signaling and brownout detection. |
| Programmable shutdown | Logic-controlled SHDN pin allows system-level power sequencing and sleep-mode control with <10 µA quiescent draw in shutdown. |
| Stability with minimal capacitance | Stable with ≥1.5 µF output capacitor (tantalum or ceramic); no ESR requirements - simplifies layout and avoids costly polymer capacitors. |
Applications
| Automotive Body Control Unit | Industrial Battery-Powered Sensor Node |
|---|---|
Use Scenario: Powering microcontroller, LIN transceiver, and analog sensor interface in door module with 9–16 V battery input subject to cold-crank dips and load dump spikes. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying core logic and I/O rails; ERR pin drives MCU interrupt for fault logging; SHDN enables wake-on-LIN. Use Value: Eliminates need for external reverse-polarity MOSFET and 60 V TVS diode; 320 mV dropout at 150 mA ensures operation down to 3.62 V input during cranking. | Use Scenario: Long-life remote environmental monitor powered by two AA cells (1.8–3.2 V), requiring regulated 3.3V for RF SoC and ADC. IC Role / Device Role / Timing Role: Low-quiescent LDO maintaining VDD during deep-sleep (100 µA IQ); ERR flag signals end-of-life battery condition to trigger data upload before shutdown. Use Value: 40 mV dropout at light load extends usable battery life by >25% vs. standard LDOs; 1.5 µF output cap fits compact PCB footprint. |
| Avionics Cabin Monitoring System | Medical Portable Diagnostic Device |
Use Scenario: Powering isolated CAN bus interface and temperature/humidity sensors in aircraft cabin, operating across –40°C to +85°C ambient with 28 V nominal bus. IC Role / Device Role / Timing Role: 3.3V supply with guaranteed 1.0% accuracy and 50 ppm/°C tempco - serves as precision reference for 16-bit ADC and digital isolator bias. Use Value: Tight line/load regulation (0.10%/0.20%) minimizes measurement error; TAP pin enables direct connection to ADC reference input for ratiometric accuracy. | Use Scenario: Clinical-grade pulse oximeter using coin-cell battery, requiring stable 3.3V for optical driver, analog front-end, and Bluetooth LE radio. IC Role / Device Role / Timing Role: Single-chip power solution with integrated ERR flag used as power-on reset and low-battery warning; SHDN enables automatic shutdown after measurement cycle. Use Value: Reverse-battery tolerance prevents damage during battery replacement; 10 µA shutdown current enables >1-year shelf life with CR2032 cell. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2033PDQNR | Lower IQ (65 nA typ), smaller 1.0 mm × 1.3 mm DFN, but only 300 mA max, no reverse-battery or load-dump rating. | Suitable for ultra-low-power IoT nodes; not qualified for automotive transients. | Select for battery life-critical wearables where input transients are controlled and space is constrained. |
| LM2951CM-3.3/NOPB | Same pinout (SOIC-8), 150 mA, 3.3V, but higher dropout (500 mV @ 150 mA), no reverse-battery protection, and 2% initial accuracy. | Legacy drop-in for cost-sensitive industrial controls without harsh environment requirements. | Choose only if existing LM2951 design requires minor requalification and transient robustness is not required. |
Compared with TPS7A2033PDQNR and LM2951CM-3.3/NOPB, the MIC2951-3.3BMM-TR uniquely combines automotive-grade transient immunity, 3.3V fixed output in compact MSOP, and integrated error flag - making it the sole option for space-constrained, safety-critical 12 V automotive subsystems requiring field-proven ruggedness.
Availability
MIC2951-3.3BMM-TR is available at Aetrix Electronics and suitable for automotive electronics, battery-powered medical devices, avionics monitoring systems, and industrial sensor networks requiring stable component supply across extended temperature and transient-voltage conditions.
Supply support for MIC2951-3.3BMM-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. Known for rugged, high-reliability regulators and Ethernet PHYs.
The MIC2951 product line was designed specifically for automotive and industrial environments demanding wide-input-voltage operation, extreme transient immunity, and integrated fault signaling - targeting body electronics, telematics, and sensor hubs where reliability trumps raw efficiency.
FAQ
What is the maximum input voltage the MIC2951-3.3BMM-TR can withstand without damage?
The MIC2951-3.3BMM-TR tolerates –20 V reverse battery and +60 V positive transients for ≤100 ms at ≤1% duty cycle. Its continuous operating input range is +2.0 V to +30 V DC. Exceeding +60 V or applying –20 V beyond brief transients risks permanent damage. Always verify input filtering matches the MIC2951-3.3BMM-TR's absolute maximum ratings in your schematic.
Does the MIC2951-3.3BMM-TR require an external capacitor on the FB pin for stability?
No, the MIC2951-3.3BMM-TR does not require an external capacitor on the FB pin for basic stability. However, if high-value feedback resistors (>100 kΩ) are used in adjustable configurations, stray capacitance may cause oscillation; adding a 100 pF capacitor between OUT and FB - along with increasing the output capacitor to ≥3.3 µF - restores stability. This requirement does not apply to the fixed 3.3V MIC2951-3.3BMM-TR in standard use.
Can the MIC2951-3.3BMM-TR be used without the ERR and SHDN pins connected?
Yes. The MIC2951-3.3BMM-TR operates as a standard 3.3V LDO with SHDN left floating (default-enable state) and ERR unconnected (open-collector, no load). Leaving SHDN open ensures regulation is always active; leaving ERR unconnected disables fault signaling but does not affect regulation. For automotive applications, however, connecting ERR to an MCU interrupt is strongly recommended for diagnostics.
What is the minimum output capacitance required for stability with the MIC2951-3.3BMM-TR?
The MIC2951-3.3BMM-TR requires a minimum of 1.5 µF output capacitance (tantalum or aluminum electrolytic) between OUT and GND for guaranteed stability across all loads and temperatures. Ceramic capacitors may be used if ≥2.2 µF and ESR ≥50 mΩ; lower values (e.g., 0.5 µF) are only acceptable for loads <10 mA. Using less than 1.5 µF risks oscillation and output ripple in typical 150 mA applications.
Is the MIC2951-3.3BMM-TR pin-compatible with other MIC2951 variants?
Yes - the MIC2951-3.3BMM-TR shares identical pinout and function with all 8-pin MIC2951 versions (e.g., MIC2951-3.3BM, MIC2951-3.3YM), differing only in package (MSOP vs SOIC), lead finish (Sn vs Pb-free), and temperature grade. It is not pin-compatible with TO-92 or DIP variants due to different pin counts and layouts. Always confirm package dimensions and thermal pad handling match your PCB footprint.
MIC2951-3.3BMM-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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 (3.3V)
- Voltage - Output (Max):
- 29V
- Voltage Dropout (Max):
- 0.6V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 300 µA
- Current - Supply (Max):
- 10 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-MSOP
MIC2951-3.3BMM-TR FAQ
1.How can I place an order for MIC2951-3.3BMM-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC2951-3.3BMM-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 MIC2951-3.3BMM-TR reliable?
The price and inventory of MIC2951-3.3BMM-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC2951-3.3BMM-TR is usually 5 days.
3.What payment methods are accepted for MIC2951-3.3BMM-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC2951-3.3BMM-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC2951-3.3BMM-TR?
MIC2951-3.3BMM-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC2951-3.3BMM-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 MIC2951-3.3BMM-TR?
For technical support, including MIC2951-3.3BMM-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC2951-3.3BMM-TR requirements.
6.How does Aetrix verify that MIC2951-3.3BMM-TR is sourced from the original manufacturer or authorized distributors?
All MIC2951-3.3BMM-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 MIC2951-3.3BMM-TR meets industry standards.
7.What is the process for return or replacement of MIC2951-3.3BMM-TR?
All MIC2951-3.3BMM-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC2951-3.3BMM-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 MIC2951-3.3BMM-TR part is unused and in its original packaging.
Return procedure for MIC2951-3.3BMM-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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