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Microchip Technology MIC5281YMM
- Part No.:
- MIC5281YMM
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MIC5281YMM.pdf
- Description:
- IC REG LINEAR POS ADJ 25MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
MIC5281YMM from Micrel is an adjustable-output, high-input-voltage linear regulator delivering up to 25mA output current with ±3% initial accuracy, ultra-low 6µA quiescent current, and >90dB PSRR across 20kHz–2MHz. It operates from 6V to 120V DC input and supports output voltage programming from 1.27V to 5.5V via external resistor divider - ideal for industrial power rails and telecom line-powered modules where transient resilience and low standby power are critical.
For engineers reviewing the MIC5281YMM datasheet, MIC5281YMM pinout, MIC5281YMM application, or MIC5281YMM equivalent, key selection criteria include its 120V absolute maximum input rating, thermal shutdown at 157°C, 8-pin MSOP package without ePad, FB pin-based feedback architecture, and compatibility with ceramic output capacitors - all essential for high-reliability off-line bias supply design.
Technical Context
The MIC5281YMM implements a high-voltage bipolar linear regulator architecture with internal current limiting (30–130mA) and thermal shutdown (157°C activation, 15°C hysteresis). Its feedback loop references a precision 1.27V bandgap (±2.5mV typical), enabling stable adjustable output regulation over −40°C to +125°C ambient.
It achieves ultra-high PSRR (>90dB) through dedicated CPSRR bypass pin and optimized internal error amplifier compensation, while maintaining dropout voltage of 2–3V at 25mA load - a trade-off enabling operation at 120V input without requiring complex switching topology.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 120V DC - supports direct connection to unregulated industrial or telecom line voltages without pre-regulation. |
| Output Current | 25mA guaranteed - sufficient for powering microcontrollers, sensors, or interface ICs in auxiliary rail applications. |
| Quiescent Current | 6µA typical - enables multi-year battery life in always-on remote monitoring nodes powered from high-voltage sources. |
| PSRR | >90dB (20kHz–2MHz) - suppresses ripple and noise from noisy HV supplies, critical for analog signal chains. |
| Output Accuracy | ±3% initial tolerance - ensures predictable system-level voltage margins without post-production trimming. |
| Dropout Voltage | 2–3V at 25mA - defines minimum VIN–VOUT differential required to maintain regulation under full load. |
| Feedback Reference | 1.27V ±0.038V - sets precise VOUT scaling ratio when using external R1/R2 divider per Equation 1. |
Pinout & Package
Package: 8-pin MSOP (no exposed pad), RoHS-compliant, lead-free finish. Thermal resistance θJA = 160°C/W - requires careful PCB copper area planning for >10mA continuous loads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Supply Input | Accepts 6–120V DC; requires 1µF ceramic capacitor to GND for stability and transient suppression. |
| NC (Pins 2, 3, 7) | No Connect | Internally unconnected; recommended to tie to GND for mechanical stability and EMI reduction. |
| CPSRR (Pin 4) | PSRR Bypass | Connects 0.1µF capacitor to GND to enhance high-frequency power supply rejection. |
| GND (Pin 5) | Ground Reference | Primary return path for VIN, CPSRR, FB, and VOUT; must be low-impedance plane. |
| FB (Pin 6) | Feedback Input | High-impedance (3.2nA typical) node sensing resistor divider output; sets VOUT = 1.27V × (1 + R1/R2). |
| VOUT (Pin 8) | Regulated Output | Delivers up to 25mA; requires 10µF ceramic capacitor to GND for loop stability and load transient response. |
Key Features
| Feature | Design Value |
|---|---|
| 120V Absolute Max Input | Withstands automotive load dump and industrial surges without external clamping circuitry. |
| Ultra-Low IQ (6µA) | Enables energy harvesting and battery-backed systems where standby current dominates lifetime. |
| Stable with Ceramic Capacitors | Eliminates need for costly tantalum or aluminum electrolytic output capacitors - reduces BOM cost and footprint. |
| Thermal Shutdown + Hysteresis | Auto-recovers after cooling by 15°C - prevents latch-up during intermittent overload conditions. |
| Adjustable Output (1.27–5.5V) | Single SKU supports multiple system voltages via resistor selection - simplifies inventory and design reuse. |
Applications
| Industrial Sensor Transmitter | Telecom Line-Powered Interface |
|---|---|
Use Scenario: 4–20mA loop-powered temperature transmitter operating from 24–48V DC supply with integrated microcontroller and analog front-end. IC Role / Device Role / Timing Role: Primary bias regulator generating clean 3.3V rail for MCU and ADC from fluctuating loop voltage. Use Value: 6µA quiescent current preserves loop compliance margin; >90dB PSRR rejects switching noise from nearby DC/DC converters. |
Use Scenario: DSL or PON optical network unit powered directly from -48V telecom battery plant with reverse-polarity protection. IC Role / Device Role / Timing Role: High-side HV LDO providing isolated 5.0V rail for PHY and management controller. Use Value: 120V input rating accommodates worst-case battery float voltage (+57V) plus transients; thermal shutdown prevents field failure during short-circuit events. |
| Off-Line IoT Gateway | Harsh-Environment Remote Monitor |
Use Scenario: Smart meter or grid-edge sensor powered from AC mains via capacitive dropper, delivering ~100V DC intermediate bus. IC Role / Device Role / Timing Role: Final-stage regulator converting unregulated HV bus to stable 3.3V for wireless SoC and flash memory. Use Value: 2–3V dropout allows efficient operation at high input voltage; ceramic capacitor compatibility improves reliability vs. electrolytics in high-temp enclosures. |
Use Scenario: Oil & gas downhole telemetry module exposed to 125°C ambient and 100V+ supply transients during motor startup. IC Role / Device Role / Timing Role: Survivable bias supply for FPGA configuration and RS-485 transceiver in explosion-proof housing. Use Value: −40°C to +125°C junction rating and 157°C thermal shutdown ensure operation in extreme environments without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-input-voltage linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3080IMSE#TRPBF | 1.2V to 36V input range; 1.1A output; uses current-source reference instead of voltage reference; no CPSRR pin. | Limited to ≤36V systems; higher output current but unsuitable for 120V line applications. | Select only if input voltage stays below 40V and >100mA load is required. |
| TPS7A6650QPWPRQ1 | 4.5–40V input; 150mA output; AEC-Q100 qualified; integrated enable/shutdown; no adjustable option below 5V. | Automotive-focused; lacks 120V rating and wide-adjustable range; requires external resistor for 3.3V output. | Prefer for automotive body electronics where qualification and enable control outweigh HV capability. |
Compared with LT3080IMSE#TRPBF and TPS7A6650QPWPRQ1, the MIC5281YMM uniquely delivers 120V input tolerance and sub-10µA quiescent current in an 8-pin MSOP - making it irreplaceable for off-line industrial and telecom auxiliary supplies where voltage range and standby efficiency are non-negotiable.
Availability
MIC5281YMM is available at Aetrix Electronics and suitable for industrial sensor transmitters, telecom line-powered interfaces, and off-line IoT gateways requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for MIC5281YMM 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 (acquired by Microchip in 2015) specialized in high-performance analog and power ICs, particularly robust voltage regulators and timing solutions for industrial and communications infrastructure.
The MIC5281 product line was engineered specifically for high-input-voltage linear regulation in harsh environments - targeting applications where switching noise, size constraints, or ultra-low standby power preclude use of DC/DC converters.
FAQ
What is the maximum input voltage the MIC5281YMM can withstand continuously?
The MIC5281YMM supports continuous operation up to +120V DC input voltage, with an absolute maximum rating of +125V. This enables direct connection to industrial 110V AC rectified rails or telecom −48V battery plants with float voltage and transients. Operation above 120V risks permanent damage, and input must remain ≥ (VOUT + 3V) for regulation.
Does the MIC5281YMM require an external capacitor on the CPSRR pin, and why?
Yes, the MIC5281YMM requires a 0.1µF capacitor connected from CPSRR (Pin 4) to GND. This capacitor stabilizes the internal error amplifier's high-frequency gain and is essential to achieve the specified >90dB PSRR performance between 20kHz and 2MHz. Omitting it degrades noise rejection and may cause instability under dynamic load conditions.
Can the MIC5281YMM be used with a 10µF ceramic output capacitor, and what is the minimum required?
Yes, the MIC5281YMM is explicitly characterized and stable with ceramic output capacitors, including the recommended 10µF value. The datasheet specifies 10µF as the standard COUT for full performance validation. Smaller values (e.g., 4.7µF) may work in low-noise, low-transient applications but risk degraded load step response and PSRR - 10µF is the verified minimum for guaranteed specification compliance.
How is the output voltage set on the MIC5281YMM, and what is the reference voltage?
The MIC5281YMM uses a resistor divider from VOUT to GND with the junction connected to FB (Pin 6). Its internal reference voltage is 1.27V (typical), with a range of 1.232V to 1.308V. Output voltage is calculated as VOUT = 1.27V × (1 + R1/R2), where R1 connects between VOUT and FB, and R2 connects between FB and GND - enabling precise adjustment from 1.27V to 5.5V.
What thermal protection features does the MIC5281YMM include, and how do they behave?
The MIC5281YMM integrates thermal shutdown that activates at approximately +157°C junction temperature, disabling the output until the die cools by 15°C (hysteresis). This prevents catastrophic failure during sustained overload or poor heatsinking. Unlike latch-off devices, it auto-recovers once safe temperature is restored - a key reliability feature for intermittently loaded industrial systems where the MIC5281YMM remains operational without manual reset.
MIC5281YMM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 120V
- Voltage - Output (Min/Fixed):
- 1.27V
- Voltage - Output (Max):
- 5.5V
- Voltage Dropout (Max):
- 3V @ 25mA
- Current - Output:
- 25mA
- Current - Quiescent (Iq):
- 11 µA
- Current - Supply (Max):
- -
- PSRR:
- 90dB (20kHz ~ 2MHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
MIC5281YMM FAQ
1.How can I place an order for MIC5281YMM through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5281YMM 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 MIC5281YMM reliable?
The price and inventory of MIC5281YMM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5281YMM is usually 5 days.
3.What payment methods are accepted for MIC5281YMM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5281YMM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5281YMM?
MIC5281YMM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5281YMM 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 MIC5281YMM?
For technical support, including MIC5281YMM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5281YMM requirements.
6.How does Aetrix verify that MIC5281YMM is sourced from the original manufacturer or authorized distributors?
All MIC5281YMM 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 MIC5281YMM meets industry standards.
7.What is the process for return or replacement of MIC5281YMM?
All MIC5281YMM units undergo pre-shipment inspection (PSI). If there is an issue with MIC5281YMM, 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 MIC5281YMM part is unused and in its original packaging.
Return procedure for MIC5281YMM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MIC5281YMM Tags
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MIC5504-1.8YM5-TR
Microchip Technology
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MIC5365-3.3YD5-TR
Microchip Technology
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