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Microchip Technology MIC3975-1.8BMMTR
- Part No.:
- MIC3975-1.8BMMTR
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC3975-1.8BMMTR.pdf
- Description:
- IC REG LINEAR LDO LOW VOLTAGE
- Quantity:
- Payment:
- Shipping:
Inventory:2,050
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Product details
Overview
MIC3975-1.8BMMTR from Microchip Technology is a 750 mA low-dropout linear regulator with fixed 1.8 V output, 350 mV dropout at full load, and ±2% output voltage accuracy. It operates over -40°C to +125°C ambient temperature, features thermal shutdown and current limiting, and is used in FPGA core power, DSP supply rails, and portable instrumentation.
For engineers reviewing the MIC3975-1.8BMMTR datasheet, MIC3975-1.8BMMTR pinout, MIC3975-1.8BMMTR application, or MIC3975-1.8BMMTR equivalent, key selection factors include guaranteed 750 mA output current at 1.8 V, stable operation with 1 µF ceramic output capacitor, and compatibility with battery-powered systems requiring tight regulation and low quiescent current (110 µA typical).
Technical Context
The MIC3975-1.8BMMTR integrates a PNP pass transistor with internal compensation, enabling stable regulation without external components beyond input/output capacitors. Its reference voltage is trimmed during final test to ensure ±2% output tolerance across line, load, and temperature.
It employs foldback current limiting and thermal shutdown with hysteresis to protect against sustained overload and junction overheating. The device maintains regulation down to 1.5 V input when delivering 100 mA, supporting single-cell Li-ion and multi-cell alkaline/battery-backed systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% - ensures stable core voltage for low-voltage logic without external feedback network. |
| Max Output Current | 750 mA - supports mid-power digital ICs including microcontrollers and interface transceivers. |
| Dropout Voltage | 350 mV at 750 mA - enables operation from 2.15 V input while maintaining 1.8 V output. |
| Quiescent Current | 110 µA typical - minimizes standby power loss in always-on battery applications. |
| Output Capacitor | 1 µF ceramic minimum - allows compact, low-ESR decoupling without tantalum or electrolytic parts. |
| Operating Temp | –40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
Pinout & Package
Package: 8-pin MicroLeadFrame (MLF), 3 mm × 3 mm, exposed pad, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.15 V to 16 V; requires local 1 µF ceramic bypass capacitor. |
| GND | Ground reference | Common return path for input, output, and internal circuitry; connects to exposed thermal pad. |
| OUT | Regulated output | Delivers 1.8 V ±2% to load; requires 1 µF ceramic output capacitor for stability. |
| EN | Enable control | Active-high logic input; pulls high internally via 1 MΩ resistor; ties to IN for always-on operation. |
| NR/ADJ | Not connected / Adjustment | No connection required; internally tied to reference; not user-accessible for adjustment. |
| BP | Bypass capacitor terminal | Connects 10 nF ceramic capacitor to GND to reduce reference noise and improve PSRR. |
Key Features
| Feature | Design Value |
|---|---|
| Stable with 1 µF ceramic output cap | Eliminates need for larger, higher-ESR tantalum or aluminum electrolytic capacitors. |
| 110 µA quiescent current | Extends battery life in portable devices operating in sleep or low-power modes. |
| Thermal shutdown with hysteresis | Prevents latch-up during transient overloads; resumes regulation after junction cools by ≥15°C. |
| ±2% output voltage accuracy | Meets tight tolerance requirements of modern 1.8 V I/O and core supplies without post-regulation trimming. |
| 350 mV dropout at 750 mA | Enables use with single-cell Li-ion (2.7–4.2 V) and two-cell alkaline (2.4–3.2 V) sources. |
Applications
| Portable Medical Sensors | FPGA Core Power |
|---|---|
Use Scenario: Wearable ECG and pulse oximetry modules powered by coin-cell or Li-poly batteries. IC Role / Device Role / Timing Role: Primary 1.8 V regulator for analog front-end and low-power MCU. Use Value: Low quiescent current preserves battery runtime; ±2% accuracy ensures consistent ADC reference stability. | Use Scenario: Configurable logic fabric requiring clean, tightly regulated 1.8 V core voltage. IC Role / Device Role / Timing Role: Post-regulator supplying FPGA core rail downstream of switching converter. Use Value: 350 mV dropout enables efficient use of intermediate bus; 1 µF ceramic stability simplifies layout near BGA packages. |
| DSP Audio Processing Units | Industrial PLC I/O Modules |
Use Scenario: Battery-backed audio codecs and real-time DSP subsystems in handheld test equipment. IC Role / Device Role / Timing Role: Low-noise 1.8 V supply for ADC/DAC interfaces and digital signal processors. Use Value: BP pin with 10 nF capacitor reduces reference noise, improving SNR in 24-bit audio paths. | Use Scenario: DIN-rail mounted programmable logic controllers with isolated 1.8 V logic-level translation. IC Role / Device Role / Timing Role: Local regulation for RS-485 transceiver bias and level-shifter ICs. Use Value: –40°C to +125°C rating ensures reliable operation in uncontrolled cabinet environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P182MR-G | 300 mA max output, 250 mV dropout at 300 mA, SOT-23-5 package | Lower current capacity; unsuitable for 750 mA FPGA core loads | Select only for space-constrained, sub-300 mA applications where MLF footprint is unavailable. |
| ON Semiconductor NCP1117ST18T3G | 1 A output, 1.2 V dropout at 800 mA, TO-220/SOT-223 packages, no enable pin | Larger thermal footprint; lacks EN control and BP noise-reduction pin | Choose when higher current and rugged packaging outweigh need for low IQ and noise-sensitive design. |
Compared with XC6206P182MR-G and NCP1117ST18T3G, the MIC3975-1.8BMMTR uniquely balances 750 mA capability, ultra-low dropout, integrated enable, and noise-suppression BP pin in a 3 mm × 3 mm MLF package-making it optimal for compact, battery-efficient, noise-sensitive 1.8 V systems.
Availability
MIC3975-1.8BMMTR is available at Aetrix Electronics and suitable for FPGA core power, portable medical sensors, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MIC3975-1.8BMMTR 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and consumer applications.
The MIC3975 family delivers high-current, low-dropout linear regulators optimized for noise-sensitive, battery-powered, and thermally constrained applications requiring precision 1.8 V to 5.0 V outputs.
FAQ
What is the maximum input voltage rating for the MIC3975-1.8BMMTR?
The MIC3975-1.8BMMTR supports an absolute maximum input voltage of 16 V. Operation above this level risks permanent damage. For continuous reliable operation, input should remain ≤16 V, with recommended derating to 14 V in high-temperature environments to maintain safe junction temperature margins. The MIC3975-1.8BMMTR includes internal protection but is not designed for transient surge conditions beyond its rated limits.
Does the MIC3975-1.8BMMTR require an external bypass capacitor on the BP pin?
Yes, the MIC3975-1.8BMMTR requires a 10 nF ceramic capacitor between the BP pin and ground to achieve specified PSRR and output noise performance. Omitting this capacitor degrades reference stability and increases output ripple, especially under dynamic load conditions. The MIC3975-1.8BMMTR datasheet specifies this as mandatory for full specification compliance-not optional for improved performance.
Can the MIC3975-1.8BMMTR be used without connecting the EN pin?
Yes, the MIC3975-1.8BMMTR can be used without externally connecting the EN pin because it features an internal 1 MΩ pull-up resistor to IN. When left unconnected, the device powers up and remains enabled. However, tying EN directly to IN ensures robust activation under all input ramp conditions. The MIC3975-1.8BMMTR does not default to disabled state and requires no external pull-up for basic operation.
Is the MIC3975-1.8BMMTR compatible with ceramic output capacitors smaller than 1 µF?
No, the MIC3975-1.8BMMTR requires a minimum 1 µF ceramic output capacitor for guaranteed stability across all operating conditions. Using smaller values-such as 0.47 µF-may cause oscillation or poor transient response, particularly at high load currents. The MIC3975-1.8BMMTR's internal compensation is optimized for ≥1 µF, and Microchip validates performance only with this minimum value.
What thermal considerations apply to the MIC3975-1.8BMMTR in a 750 mA application?
At 750 mA output with 2.15 V input (350 mV dropout), power dissipation is ~0.26 W. With the MLF package's θJA of 120°C/W, junction temperature rise is ~31°C above ambient-well within the +125°C limit. Adequate PCB copper area under the exposed pad is essential; the MIC3975-1.8BMMTR requires ≥4 cm² of 2-oz copper connected to GND for full-rated current operation.
MIC3975-1.8BMMTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 750mA
- Current - Output:
- 750mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- 15 mA
- PSRR:
- -
- Control Features:
- Enable, Error Flag
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MIC3975-1.8BMMTR FAQ
1.How can I place an order for MIC3975-1.8BMMTR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC3975-1.8BMMTR 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 MIC3975-1.8BMMTR reliable?
The price and inventory of MIC3975-1.8BMMTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC3975-1.8BMMTR is usually 5 days.
3.What payment methods are accepted for MIC3975-1.8BMMTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC3975-1.8BMMTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC3975-1.8BMMTR?
MIC3975-1.8BMMTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC3975-1.8BMMTR 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 MIC3975-1.8BMMTR?
For technical support, including MIC3975-1.8BMMTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC3975-1.8BMMTR requirements.
6.How does Aetrix verify that MIC3975-1.8BMMTR is sourced from the original manufacturer or authorized distributors?
All MIC3975-1.8BMMTR 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 MIC3975-1.8BMMTR meets industry standards.
7.What is the process for return or replacement of MIC3975-1.8BMMTR?
All MIC3975-1.8BMMTR units undergo pre-shipment inspection (PSI). If there is an issue with MIC3975-1.8BMMTR, 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 MIC3975-1.8BMMTR part is unused and in its original packaging.
Return procedure for MIC3975-1.8BMMTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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