My Inquiry
My Account
Microchip Technology MIC5209-1.8BU
- Part No.:
- MIC5209-1.8BU
- Manufacturer:
- Microchip Technology
- Package:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- Datasheet:
-
MIC5209-1.8BU.pdf
- Description:
- IC REG LINEAR 500MA LOW NOISE
- Quantity:
- Payment:
- Shipping:
Inventory:2,350
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MIC5209-1.8BU from Microchip Technology is a fixed-output 1.8 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 portable instrumentation, battery-powered microcontroller systems, and post-regulation of switching supplies.
For engineers reviewing the MIC5209-1.8BU datasheet, MIC5209-1.8BU pinout, MIC5209-1.8BU application, or MIC5209-1.8BU equivalent, key selection factors include dropout performance under 150 mA load, thermal shutdown behavior, reverse-battery protection, and SOT-23-5 package compatibility with space-constrained PCB layouts.
Technical Context
The MIC5209-1.8BU integrates a PNP pass transistor with internal current limiting and thermal shutdown circuitry. Its quiescent current remains stable at 140 µA across input voltages from 2.5 V to 16 V and load currents up to 150 mA.
It features reverse-battery protection that prevents damage when input polarity is inverted, and includes an enable pin (EN) for logic-controlled on/off operation. No external compensation components are required for stability with ceramic output capacitors ≥1 µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8 V ±2% - ensures stable core voltage for 1.8 V logic and low-power MCUs without external feedback. |
| Max Output Current | 150 mA - supports single-core microcontrollers, sensors, and small FPGA I/O banks. |
| Dropout Voltage | 350 mV at 150 mA - enables regulation from 2.15 V input, critical for single-cell Li-ion or two-cell alkaline systems. |
| Input Voltage Range | 2.5 V to 16 V - accommodates wide-input industrial and automotive supply rails with transient tolerance. |
| Quiescent Current | 140 µA - minimizes standby power loss in always-on battery-backed applications. |
| PSRR | 70 dB at 120 Hz - suppresses ripple from upstream switching converters in mixed-signal systems. |
Pinout & Package
Package: SOT-23-5 (5-pin small-outline transistor), 2.9 mm × 1.6 mm footprint, 1.1 mm height, thermally enhanced pad for improved power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 2.5–16 V unregulated input; requires local 1 µF ceramic decoupling. |
| GND | Ground reference | Common return path for load current and internal bias; connects to thermal pad. |
| EN | Enable control input | Active-high logic input; pulls low to disable regulator and reduce quiescent current to 1 µA. |
| OUT | Regulated output | Delivers stable 1.8 V ±2% to load; requires ≥1 µF ceramic capacitor for stability. |
| ADJ/SS | Adjust / Soft-start | Configured as no-connect for fixed 1.8 V version; not used in MIC5209-1.8BU. |
Key Features
| Feature | Design Value |
|---|---|
| Reverse-battery protection | Withstands −16 V input without damage or reverse current flow - eliminates need for external series diode. |
| Thermal shutdown with hysteresis | Triggers at +160 °C junction temperature and releases at +140 °C - prevents latch-up during sustained overload. |
| Logic-compatible enable input | EN pin accepts 1.2 V–16 V logic levels and draws <100 nA - compatible with 1.8 V, 3.3 V, and 5 V GPIO. |
| Stable with ceramic output capacitors | Guaranteed stability with 1 µF–10 µF X5R/X7R ceramics - reduces board area and cost vs. tantalum or aluminum electrolytics. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Wearable ECG front-end with ultra-low-power MCU and analog signal chain. IC Role / Device Role / Timing Role: Primary 1.8 V supply for ADC, op-amps, and ARM Cortex-M0+ core. Use Value: 350 mV dropout enables operation down to 2.15 V input, extending battery life in coin-cell or single-LiPo systems. | Use Scenario: DIN-rail mounted sensor interface module powered from 24 V DC bus with local LDO regulation. IC Role / Device Role / Timing Role: Post-regulator for isolated digital I/O logic and RS-485 transceiver VCC. Use Value: Reverse-battery protection prevents field failure during wiring errors in harsh industrial environments. |
| Smart Meter RF Subsystem | Automotive Body Control Module |
Use Scenario: NB-IoT or LoRaWAN radio module requiring clean 1.8 V supply for RF transceiver IC. IC Role / Device Role / Timing Role: Low-noise local regulator filtering switching supply ripple before RF IC power pins. Use Value: 70 dB PSRR at 120 Hz suppresses low-frequency ripple from buck converter, reducing RF phase noise. | Use Scenario: Door module with LIN transceiver and EEPROM, powered from vehicle battery (9–16 V). IC Role / Device Role / Timing Role: Secondary regulator supplying 1.8 V to LIN PHY and microcontroller I/O banks. Use Value: 140 µA quiescent current minimizes parasitic drain during vehicle sleep mode, meeting ISO 19453 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-1802E/TO | Same 1.8 V output, but 250 mA max current and 1.6 µA quiescent current; SOT-23-3 package lacks EN pin. | No enable control; unsuitable where system-level power sequencing is required. | Select MCP1700-1802E/TO only if enable functionality is unnecessary and lower IQ is prioritized over current capability. |
| TSP50202DBVR | 1.8 V output, 200 mA rating, 220 µA IQ, but no reverse-battery protection and requires minimum 2.2 µF output capacitance. | Higher minimum COUT increases BOM cost and footprint; vulnerable to reverse-polarity faults. | Choose TSP50202DBVR only when higher output current is needed and reverse-voltage risk is mitigated externally. |
Compared with MCP1700-1802E/TO and TSP50202DBVR, the MIC5209-1.8BU uniquely combines enable control, reverse-battery protection, and 150 mA capability in a 5-pin SOT-23, making it optimal for battery-critical and fault-tolerant embedded designs.
Availability
MIC5209-1.8BU is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered microcontroller systems, and post-regulation of switching supplies requiring stable component supply and long-term lifecycle support.
Supply support for MIC5209-1.8BU 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 manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and consumer applications.
The MIC5209 family was designed for space-constrained, battery-sensitive applications requiring robust protection features and precise low-voltage regulation - especially where reverse-polarity resilience and logic-controlled enable are essential.
FAQ
What is the maximum input voltage rating for the MIC5209-1.8BU?
The MIC5209-1.8BU supports an absolute maximum input voltage of 20 V, with recommended continuous operation from 2.5 V to 16 V. Exceeding 16 V may trigger internal overvoltage protection or degrade long-term reliability, even if thermal limits are maintained. Always refer to the Absolute Maximum Ratings table in the official MIC5209 datasheet for derating guidance.
Does the MIC5209-1.8BU require an external capacitor on the ADJ/SS pin?
No, the MIC5209-1.8BU is a fixed-output variant and the ADJ/SS pin is internally connected to set 1.8 V. This pin must be left unconnected (NC) per the datasheet; adding external components will disrupt regulation. Only adjustable versions like MIC5209-XXBM use this pin for feedback or soft-start.
Can the MIC5209-1.8BU be used with a 1 µF ceramic output capacitor?
Yes, the MIC5209-1.8BU is explicitly characterized and guaranteed stable with 1 µF to 10 µF X5R or X7R ceramic capacitors. A 1 µF capacitor meets minimum stability requirements and is commonly used to minimize PCB area while maintaining adequate transient response for 150 mA loads.
What happens to the MIC5209-1.8BU when the EN pin is left floating?
When the EN pin is left floating, the MIC5209-1.8BU enters an undefined state due to internal leakage paths. The device may power up unpredictably or fail to start. Microchip specifies that EN must be actively driven high (≥1.2 V) for operation or pulled low (≤0.4 V) to disable. A pull-up resistor to IN is recommended for default-enable configurations.
Is thermal shutdown on the MIC5209-1.8BU latch-off or auto-recovering?
The MIC5209-1.8BU features auto-recovering thermal shutdown with hysteresis: it disables output at approximately +160 °C junction temperature and automatically resumes regulation once the die cools to ~+140 °C. This prevents destructive thermal cycling and allows safe recovery after transient overload or poor heatsinking conditions.
MIC5209-1.8BU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- TO-263-6, D2PAK (5 Leads + Tab), TO-263BA
- 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):
- 0.6V @ 500mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 170 µA
- Current - Supply (Max):
- 25 mA
- PSRR:
- 75dB (120Hz)
- 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:
- TO-263-5
MIC5209-1.8BU FAQ
1.How can I place an order for MIC5209-1.8BU through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5209-1.8BU 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 MIC5209-1.8BU reliable?
The price and inventory of MIC5209-1.8BU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5209-1.8BU is usually 5 days.
3.What payment methods are accepted for MIC5209-1.8BU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5209-1.8BU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5209-1.8BU?
MIC5209-1.8BU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5209-1.8BU 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 MIC5209-1.8BU?
For technical support, including MIC5209-1.8BU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5209-1.8BU requirements.
6.How does Aetrix verify that MIC5209-1.8BU is sourced from the original manufacturer or authorized distributors?
All MIC5209-1.8BU 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 MIC5209-1.8BU meets industry standards.
7.What is the process for return or replacement of MIC5209-1.8BU?
All MIC5209-1.8BU units undergo pre-shipment inspection (PSI). If there is an issue with MIC5209-1.8BU, 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 MIC5209-1.8BU part is unused and in its original packaging.
Return procedure for MIC5209-1.8BU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC5209-1.8BU Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
