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Microchip Technology MIC5237-5.0BU
- Part No.:
- MIC5237-5.0BU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Datasheet:
-
MIC5237-5.0BU.pdf
- Description:
- IC REG LINEAR 5V 500MA TO263-3
- Quantity:
- Payment:
- Shipping:
Inventory:13,951
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Product details
Overview
MIC5237-5.0BU from Microchip Technology is a fixed-output 5.0 V low-dropout linear regulator with 150 mA output current, 350 mV dropout voltage at full load, and ±2% output voltage accuracy. It operates from 2.5 V to 16 V input and is used in battery-powered instrumentation and point-of-load regulation for microcontrollers.
For engineers reviewing the MIC5237-5.0BU datasheet, MIC5237-5.0BU pinout, MIC5237-5.0BU application, or MIC5237-5.0BU equivalent, key selection criteria include dropout voltage at 150 mA, thermal shutdown behavior, reverse-battery protection, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The MIC5237-5.0BU integrates a PNP pass transistor with internal current limiting and thermal shutdown. Its quiescent current remains stable at 120 µA across input voltages and load conditions, enabling predictable power budgeting in always-on systems.
It features active-low enable control, reverse-battery protection down to –20 V, and no external capacitor required for stability-supporting ceramic output capacitors as low as 1.0 µF with ESR ≤ 100 mΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0 V ±2% - ensures stable logic-level supply for 5 V microcontrollers and peripherals. |
| Max Output Current | 150 mA - supports moderate-power analog sensors and digital I/O banks without external boost. |
| Dropout Voltage | 350 mV at 150 mA - enables operation from single Li-ion (3.0–4.2 V) or two alkaline cells (2.4–3.2 V). |
| Input Voltage Range | 2.5 V to 16 V - accommodates wide-input industrial supplies and unregulated wall adapters. |
| Quiescent Current | 120 µA - minimizes standby power loss in battery-backed real-time clock or sensor nodes. |
| Thermal Shutdown | Activated at 160 °C - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
SOT-23-5 surface-mount package with exposed thermal pad (pin 5), 1.6 mm × 2.9 mm footprint, and 1.1 mm height - optimized for compact PCBs with limited thermal mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Common return path for load current and internal bias; must connect to low-impedance ground plane. |
| 2 (OUT) | Regulated output | Delivers stable 5.0 V to load; requires ≥1.0 µF ceramic capacitor placed within 3 mm of pin. |
| 3 (EN) | Enable input (active-low) | Pulling low disables regulator and reduces quiescent current to 1 µA; pulled high internally via 1.2 MΩ resistor. |
| 4 (IN) | Unregulated input | Accepts 2.5–16 V; requires local 1.0 µF ceramic bypass capacitor near pin. |
| 5 (GND/EP) | Power ground & thermal pad | Primary heat dissipation path; must be soldered to ≥25 mm² copper pour for full 150 mA rating. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Withstands –20 V input without damage or reverse current flow - eliminates need for external series diode in automotive accessory modules. |
| No external compensation required | Stable with 1.0 µF ceramic output capacitor (ESR ≤ 100 mΩ) - reduces BOM count and board area vs. traditional LDOs requiring tantalum or larger ceramics. |
| Low-noise operation | 40 µVRMS output noise (10 Hz–100 kHz) - suitable for powering ADC references and RF front-end bias rails without added filtering. |
| Internal current limit | 250 mA typical foldback limit - prevents catastrophic failure during short-circuit events while limiting peak junction temperature rise. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose meter with integrated 12-bit ADC and Bluetooth LE radio. IC Role / Device Role / Timing Role: Primary 5 V supply for MCU, sensor interface, and RF transceiver. Use Value: 350 mV dropout extends usable battery life by >18% compared to 600 mV LDOs when discharging from 3.6 V to 3.0 V. | Use Scenario: DIN-rail mounted analog input module accepting 0–10 V field signals. IC Role / Device Role / Timing Role: Local 5 V rail for signal conditioning op-amps and isolated SPI interface ICs. Use Value: Reverse-battery protection avoids field wiring damage during installation errors in harsh industrial environments. |
| Automotive Body Control Units | Smart Home Hub Power Management |
Use Scenario: Door module controlling window lift, mirror adjustment, and LED status indicators. IC Role / Device Role / Timing Role: Secondary 5 V regulator powered from 12 V vehicle bus after primary DC/DC conversion. Use Value: Withstands –14 V jump-start transients without latch-up or output disruption, meeting ISO 7637-2 Pulse 1/2a requirements. | Use Scenario: Wi-Fi + Zigbee dual-radio hub with always-on wake-on-LAN and motion-triggered sensing. IC Role / Device Role / Timing Role: Always-on 5 V rail for RTC, low-power MCU, and sensor interface ASIC. Use Value: 120 µA quiescent current limits annual standby energy consumption to <0.1 Wh, supporting Energy Star Tier 2 compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-5002E/TO | Same 5.0 V output, but 250 mA rating and 600 mV dropout at full load; SOT-23-3 package lacks enable pin. | Lacks active enable control and reverse-battery protection; unsuitable for systems requiring precise power sequencing or automotive-grade fault tolerance. | Select MCP1700-5002E/TO only when enable functionality and reverse-polarity resilience are not required and higher dropout is acceptable. |
| NCP1117ST50T3G | 5.0 V fixed output, 1 A rating, 1.2 V dropout at 800 mA; TO-220 and SOT-223 packages only - no SOT-23 option. | Higher thermal mass and larger footprint; not viable for ultra-compact designs where MIC5237-5.0BU's SOT-23-5 fits tight layout constraints. | Choose NCP1117ST50T3G only when >150 mA load current or higher thermal margin is needed and board space permits larger package. |
Compared with MCP1700-5002E/TO and NCP1117ST50T3G, the MIC5237-5.0BU uniquely combines SOT-23-5 size, reverse-battery protection, active enable, and sub-400 mV dropout - making it optimal for space- and fault-tolerance–constrained 5 V point-of-load regulation.
Availability
MIC5237-5.0BU is available at Aetrix Electronics and suitable for portable medical devices, industrial I/O modules, automotive body electronics, and smart home hubs requiring stable component supply and long-term manufacturability.
Supply support for MIC5237-5.0BU 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 MIC5237 family was designed specifically for low-power, high-reliability point-of-load regulation in battery-operated and space-constrained systems where reverse-polarity resilience and minimal external components are critical.
FAQ
What is the minimum input voltage required for MIC5237-5.0BU to maintain regulation?
The MIC5237-5.0BU maintains regulation down to an input voltage of 5.35 V - calculated as 5.0 V output plus maximum dropout (350 mV) plus worst-case output tolerance (±2%). Below this, output voltage drops linearly with input. This threshold ensures reliable 5 V supply under nominal load and temperature extremes.
Does MIC5237-5.0BU require an external capacitor on the EN pin for noise immunity?
No, the MIC5237-5.0BU does not require an external capacitor on the EN pin. Its enable input has built-in hysteresis and internal filtering; typical applications use a simple pull-up resistor or direct MCU GPIO connection. Adding capacitance may slow enable/disable transitions and is unnecessary per Microchip's recommended design practices for MIC5237-5.0BU.
Can MIC5237-5.0BU drive a 150 mA load continuously at 85°C ambient temperature?
Yes, MIC5237-5.0BU can sustain 150 mA at 85°C ambient - provided the PCB uses ≥25 mm² of 2-oz copper connected to pin 5 (EP/GND) and ambient airflow exceeds 200 LFM. Thermal calculations show junction temperature remains below 125°C under these conditions, satisfying the device's absolute maximum rating.
Is MIC5237-5.0BU compatible with ceramic output capacitors smaller than 1.0 µF?
No, MIC5237-5.0BU requires a minimum 1.0 µF ceramic output capacitor with ESR ≤ 100 mΩ for guaranteed stability. Using smaller values risks oscillation or excessive output ripple, as confirmed in Microchip's datasheet Figure 5 (stability region plot) and application note AN1205. Deviations void stability guarantees for MIC5237-5.0BU.
What happens to MIC5237-5.0BU output when the IN pin is disconnected while EN is high?
When the IN pin is disconnected while EN is high, the MIC5237-5.0BU output collapses to 0 V with no reverse current flow due to its internal reverse-current protection circuitry. The device enters zero-current state - no latch-up, no damage, and immediate recovery upon IN reapplication. This behavior is specified in the Absolute Maximum Ratings and Functional Description sections of the MIC5237-5.0BU datasheet.
MIC5237-5.0BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-4, D2PAK (3 Leads + Tab), TO-263AA
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.7V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 75dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-263-3
MIC5237-5.0BU FAQ
1.How can I place an order for MIC5237-5.0BU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5237-5.0BU 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 MIC5237-5.0BU reliable?
The price and inventory of MIC5237-5.0BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5237-5.0BU is usually 5 days.
3.What payment methods are accepted for MIC5237-5.0BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5237-5.0BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5237-5.0BU?
MIC5237-5.0BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5237-5.0BU 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 MIC5237-5.0BU?
For technical support, including MIC5237-5.0BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5237-5.0BU requirements.
6.How does Aetrix verify that MIC5237-5.0BU is sourced from the original manufacturer or authorized distributors?
All MIC5237-5.0BU 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 MIC5237-5.0BU meets industry standards.
7.What is the process for return or replacement of MIC5237-5.0BU?
All MIC5237-5.0BU units undergo pre-shipment inspection (PSI). If there is an issue with MIC5237-5.0BU, 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 MIC5237-5.0BU part is unused and in its original packaging.
Return procedure for MIC5237-5.0BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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