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Microchip Technology MIC37100-1.65BS
- Part No.:
- MIC37100-1.65BS
- Manufacturer:
- Microchip Technology
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
MIC37100-1.65BS.pdf
- Description:
- IC REG LINEAR 1.65V 1A SOT223-3
- Quantity:
- Payment:
- Shipping:
Inventory:8,685
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Product details
Overview
MIC37100-1.65BS from Microchip Technology is a 1.65 V fixed-output, 1 A low-dropout linear regulator (LDO) in SOT-223 package with thermal shutdown, current limit, and reverse-battery protection; used in battery-powered portable electronics requiring stable low-voltage rail.
For engineers reviewing the MIC37100-1.65BS datasheet, MIC37100-1.65BS pinout, MIC37100-1.65BS application, or MIC37100-1.65BS equivalent, key selection criteria include dropout voltage at 1 A load, ground pin current vs. load, thermal performance in SOT-223, and reverse-battery fault behavior under -16 V input.
Technical Context
The MIC37100-1.65BS employs a PNP pass transistor architecture enabling ultra-low dropout (350 mV at 1 A), with internal bandgap reference and error amplifier delivering ±2% output voltage accuracy over temperature and line/load variation. It integrates foldback current limiting and thermal shutdown with automatic recovery.
Input voltage range is 2.25 V to 16 V, supporting single-cell Li-ion, dual-cell alkaline, or regulated 3.3/5 V rails. The device requires no external compensation and remains stable with 10 µF ceramic output capacitance (X5R/X7R).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.65 V ±2% (guaranteed over -40°C to +125°C junction temp) |
| Max Output Current | 1 A continuous (limited by thermal resistance and ambient conditions) |
| Dropout Voltage | 350 mV at 1 A load (enables operation down to 2.0 V input) |
| Ground Pin Current | 12 mA typical at 1 A load (impacts system efficiency in battery apps) |
| Reverse-Battery Protection | Withstands −16 V input without damage or reverse current flow |
| Thermal Shutdown | Activates at ~160°C junction temp; auto-restarts after cooldown |
Pinout & Package
SOT-223 package with exposed thermal pad (pin 4), standard 3-pin configuration: input, ground, output. Thermal pad must be soldered to PCB copper for rated current capability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Input) | VIN | Regulator input; accepts 2.25–16 V; reverse-battery tolerant to −16 V |
| Pin 2 (Ground) | GND | Reference and return path; connects to thermal pad for heat dissipation |
| Pin 3 (Output) | VOUT | Stable 1.65 V output; requires ≥10 µF ceramic capacitor for stability |
| Pin 4 (Tab) | Thermal Pad / GND | Internally connected to GND; must be soldered to ≥1 cm² copper area |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Dropout | 350 mV at full 1 A load enables use with weak or depleted batteries |
| Reverse-Battery Protection | No external diode needed; prevents damage and reverse current during battery reversal |
| Integrated Thermal Shutdown | Self-protecting under overload or poor heatsinking; recovers automatically |
| Low Ground Current | 12 mA at 1 A improves battery life vs. older LDOs with >50 mA quiescent |
Applications
| Portable Medical Sensors | Industrial IoT Edge Nodes |
|---|---|
Use Scenario: Wearable glucose monitor powered by coin cell or small Li-ion battery. IC Role / Device Role / Timing Role: Primary 1.65 V supply for ultra-low-power ADC and BLE SoC. Use Value: 350 mV dropout extends usable battery life by enabling regulation until battery drops to 2.0 V. | Use Scenario: Battery-backed sensor node operating in remote industrial environments. IC Role / Device Role / Timing Role: Stable 1.65 V rail for precision analog front-end and microcontroller core. Use Value: Reverse-battery protection eliminates risk of field failure during battery replacement. |
| Smart Meter RF Modules | Automotive Body Control Subsystems |
Use Scenario: Sub-GHz RF transceiver module in AMI smart meter with intermittent solar/battery hybrid power. IC Role / Device Role / Timing Role: Low-noise 1.65 V supply for RF IC bias and digital logic. Use Value: 12 mA ground current minimizes standby power draw during long sleep cycles. | Use Scenario: Door module with LIN interface and LED drivers in 12 V automotive systems. IC Role / Device Role / Timing Role: Secondary low-voltage rail derived from main 5 V or 3.3 V supply. Use Value: Thermal shutdown and foldback current limit prevent latch-up during load dump transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-165E/MB | Same 1.65 V output, but 250 mA max current and higher 600 mV dropout at 250 mA | Not suitable for 1 A loads; limited to ultra-low-power MCU peripherals | Select MIC37100-1.65BS when full 1 A capability and sub-400 mV dropout are required |
| TPS7A20165PDBVR | 1.65 V output, 300 mA rating, 170 mV dropout at 300 mA, no reverse-battery protection | Lacks reverse-battery tolerance; requires external protection diode in battery-reversal-prone designs | Choose MIC37100-1.65BS where reverse-battery robustness and 1 A delivery are mandatory |
Compared with MCP1703T-165E/MB and TPS7A20165PDBVR, the MIC37100-1.65BS uniquely delivers 1 A output with reverse-battery protection and <400 mV dropout - critical for high-current, field-serviceable battery-powered systems.
Availability
MIC37100-1.65BS is available at Aetrix Electronics and suitable for portable medical sensors, industrial IoT edge nodes, and smart meter RF modules requiring stable component supply across production lifecycles.
Supply support for MIC37100-1.65BS 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 MIC37xxx series is designed specifically for high-current, battery-critical LDO applications demanding reverse-battery tolerance, thermal resilience, and minimal dropout in compact SOT-223 packaging.
FAQ
What is the maximum input voltage rating for the MIC37100-1.65BS?
The MIC37100-1.65BS supports an absolute maximum input voltage of +16 V and withstands −16 V under reverse-battery conditions without damage or reverse current flow. This rating is specified in the official Microchip datasheet MCRLS02931-1 and applies across the full operating temperature range.
Does the MIC37100-1.65BS require an external capacitor for stability?
Yes, the MIC37100-1.65BS requires a minimum 10 µF ceramic output capacitor (X5R or X7R dielectric) placed close to the VOUT and GND pins. This is mandatory for loop stability and transient response; tantalum or aluminum electrolytic capacitors are not recommended due to ESR and aging effects.
Can the MIC37100-1.65BS deliver its full 1 A output continuously?
The MIC37100-1.65BS is rated for 1 A continuous output, but actual sustained current depends on PCB thermal design. With the thermal pad properly soldered to ≥1 cm² copper area and ambient temperature ≤+65°C, full 1 A is achievable; derating is required above that temperature per the thermal resistance curve in the MIC37100-1.65BS datasheet.
Is the MIC37100-1.65BS pin-compatible with other MIC37100 variants?
Yes, all MIC37100 variants (e.g., MIC37100-1.8BS, MIC37100-3.3BS) share identical SOT-223 pinout and thermal pad layout. Only the output voltage differs; no PCB redesign is needed when changing between fixed-output versions of the MIC37100-1.65BS family.
What protection features are integrated into the MIC37100-1.65BS?
The MIC37100-1.65BS integrates thermal shutdown with automatic recovery, foldback current limiting, and reverse-battery protection down to −16 V. These functions operate independently and do not require external components - all are active simultaneously during normal and fault conditions.
MIC37100-1.65BS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.65V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
MIC37100-1.65BS FAQ
1.How can I place an order for MIC37100-1.65BS through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC37100-1.65BS 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 MIC37100-1.65BS reliable?
The price and inventory of MIC37100-1.65BS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC37100-1.65BS is usually 5 days.
3.What payment methods are accepted for MIC37100-1.65BS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC37100-1.65BS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC37100-1.65BS?
MIC37100-1.65BS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC37100-1.65BS 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 MIC37100-1.65BS?
For technical support, including MIC37100-1.65BS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC37100-1.65BS requirements.
6.How does Aetrix verify that MIC37100-1.65BS is sourced from the original manufacturer or authorized distributors?
All MIC37100-1.65BS 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 MIC37100-1.65BS meets industry standards.
7.What is the process for return or replacement of MIC37100-1.65BS?
All MIC37100-1.65BS units undergo pre-shipment inspection (PSI). If there is an issue with MIC37100-1.65BS, 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 MIC37100-1.65BS part is unused and in its original packaging.
Return procedure for MIC37100-1.65BS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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