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Microchip Technology MIC5255-2.85YM5-TR
- Part No.:
- MIC5255-2.85YM5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MIC5255-2.85YM5-TR.pdf
- Description:
- IC REG LIN 2.85V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
MIC5255-2.85YM5-TR from Micrel is a 150mA, 2.85V fixed-output CMOS low-dropout regulator optimized for ultra-low-noise RF power rails. It delivers 1% initial output accuracy, 135mV dropout at full load, and 30µV(rms) output noise with 0.01µF bypass capacitor - enabling clean supply for sensitive analog/RF circuitry in space-constrained portable devices.
For engineers reviewing the MIC5255-2.85YM5-TR datasheet, MIC5255-2.85YM5-TR pinout, MIC5255-2.85YM5-TR application, or MIC5255-2.85YM5-TR equivalent, key selection criteria include its SOT-23-5 package compatibility, TTL-compatible enable input, ceramic-capacitor stability, thermal shutdown protection, and sub-100µA quiescent current in active mode.
Technical Context
The MIC5255-2.85YM5-TR uses a CMOS pass transistor architecture with internal reference bypassing via dedicated BYP pin, enabling ultra-low-noise regulation without external LDO post-filtering. Its active-clamp shutdown discharges the output capacitor rapidly, supporting controlled power sequencing in battery-powered systems.
It operates across 2.7V–6.0V input range with tight line (0.05%/V) and load (2.5%) regulation, and integrates thermal shutdown (150°C trip) and current limit (425mA typical). The device remains stable with ≥1µF ceramic output capacitors and requires no minimum load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.85V ±1% initial accuracy - ensures precise biasing for 2.8V–3.0V logic and RF ICs without external feedback. |
| Dropout Voltage | 135mV at 150mA - enables operation from single-cell Li-ion (3.0V min) or dual-cell alkaline (3.2V) with margin. |
| Output Noise | 30µV(rms), 10Hz–100kHz with 0.01µF BYP cap - meets stringent spectral purity requirements for VCOs, PLLs, and LNAs. |
| Quiescent Current | 90µA typical at 100µA load - extends battery life in always-on monitoring circuits and low-power sleep modes. |
| Enable Threshold | VIH = 1.6V, VIL = 0.4V - compatible with 1.8V/3.3V GPIOs without level-shifting; prevents floating-state misoperation. |
| Thermal Protection | 150°C shutdown with 10°C hysteresis - protects against sustained overload in sealed handheld enclosures. |
| PSRR | 50dB at 10kHz - suppresses switching noise from DC-DC converters feeding the LDO input rail. |
Pinout & Package
Package: 5-pin SOT-23 (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm body height, lead-free (Pb-free) compliant, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Supply Input | Accepts 2.7V–6.0V unregulated input; requires 1µF ceramic bypass to GND for stability. |
| 2 - GND | Ground Reference | Primary return path for load, quiescent, and enable currents; must be low-impedance connection. |
| 3 - EN | Enable/Shutdown Input | TTL-compatible active-high control; <0.4V disables regulator, reducing IQ to 0.2µA; must not float. |
| 4 - BYP | Reference Bypass | Connects 0.01µF–1.0µF capacitor to GND to reduce output noise; open-circuit allowed but increases noise. |
| 5 - OUT | Regulated Output | Delivers 2.85V ±1% to load; requires ≥1µF ceramic capacitor (X7R/X5R) for stability; supports zero-load operation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-noise regulation | 30µV(rms) output noise with 0.01µF BYP cap - eliminates need for secondary RC filtering in RF signal chains. |
| Ceramic-capacitor stability | Stable with ≥1µF X7R/X5R ceramic output caps (ESR ≤300mΩ) - reduces board area vs. tantalum/electrolytic solutions. |
| Active output discharge | Integrated N-MOSFET clamp pulls OUT to GND when disabled - prevents back-powering of downstream circuitry during shutdown. |
| Zero-off-mode current | 0.2µA shutdown current - preserves battery charge during extended standby in pagers and IoT sensors. |
| No minimum load requirement | Remains in regulation with 0mA load - suitable for CMOS RAM keep-alive and real-time clock backup rails. |
Applications
| Cellular Front-End Modules | Bluetooth/Wi-Fi SoC Power Rails |
|---|---|
|
Use Scenario: Powering RF transceivers and power amplifiers in GSM/UMTS handsets where supply ripple directly impacts EVM and ACLR. IC Role / Device Role / Timing Role: Ultra-low-noise voltage source for VCO, LNA, and PA bias rails - replaces multi-stage LC filtering. Use Value: 30µV(rms) noise and 50dB PSRR at 10kHz prevent phase noise degradation and adjacent-channel interference. |
Use Scenario: Supplying 2.85V core voltage to Bluetooth 5.0 and Wi-Fi 4/5 SoCs during burst transmit/receive cycles. IC Role / Device Role / Timing Role: Fast-transient LDO delivering stable 2.85V under dynamic 10–150mA load steps with <10µs recovery. Use Value: Tight load regulation (2.5%) and 135mV dropout maintain voltage headroom during peak current pulses. |
| Portable Medical Sensors | Industrial Handheld Scanners |
|
Use Scenario: Biasing low-noise instrumentation amplifiers and ADC reference buffers in battery-powered ECG/SpO₂ monitors. IC Role / Device Role / Timing Role: Precision 2.85V reference-grade supply with 1% initial accuracy and no-load stability. Use Value: Eliminates drift-induced measurement error; 90µA quiescent current extends 2-week battery life on coin cells. |
Use Scenario: Powering laser diode drivers and image sensor interfaces in rugged barcode scanners operating from 3.6V Li-ion packs. IC Role / Device Role / Timing Role: Robust 150mA LDO with thermal shutdown and current limit protecting against shorted sensor cables. Use Value: 150°C thermal cutoff prevents field failures during repeated drop testing; SOT-23-5 footprint fits narrow PCB form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P282MR | 2.8V output, 100mA rating, 250mV dropout @ 100mA, no BYP pin | Lacks noise-bypass capability and 150mA drive; limited to lower-current analog rails | Select when board space is critical and noise <50µV(rms) is acceptable; verify thermal derating at 150mA. |
| Analog Devices ADP160ACBZ-2.85-R7 | 2.85V output, 150mA, 195mV dropout @ 150mA, 27µV(rms) noise, no enable pin | Higher dropout limits input range; lacks TTL enable for power sequencing control | Choose when lowest possible noise is priority and system-level enable control is handled externally. |
Compared with MIC5255-2.85YM5-TR, the XC6206P282MR trades noise performance and current capability for smaller size, while the ADP160ACBZ-2.85-R7 achieves lower noise but sacrifices programmable shutdown - making MIC5255-2.85YM5-TR optimal for RF systems requiring both precision enable control and sub-30µV noise.
Availability
MIC5255-2.85YM5-TR is available at Aetrix Electronics and suitable for cellular front-end modules, portable medical sensors, industrial handheld scanners, and Bluetooth/Wi-Fi SoC power rails requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MIC5255-2.85YM5-TR 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 Inc. was a U.S.-based semiconductor company specializing in high-performance analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015. Known for innovation in low-noise LDOs and Ethernet PHYs.
The MIC5255 family was designed specifically for ultra-low-noise, battery-efficient power regulation in handheld wireless devices - emphasizing ceramic-capacitor compatibility, fast transient response, and integrated shutdown control.
FAQ
What is the maximum input voltage for MIC5255-2.85YM5-TR?
The absolute maximum input voltage for MIC5255-2.85YM5-TR is +7V, but the recommended operating range is +2.7V to +6.0V per datasheet specifications. Exceeding 6.0V risks violating absolute maximum ratings and may trigger thermal shutdown or permanent damage. For reliable 2.85V output at 150mA, VIN should remain ≥3.0V to maintain sufficient dropout margin.
Does MIC5255-2.85YM5-TR require an external bypass capacitor on the BYP pin?
No, MIC5255-2.85YM5-TR does not require an external bypass capacitor on the BYP pin - it may be left open. However, connecting a 0.01µF ceramic capacitor from BYP to GND reduces output noise from ~60µV(rms) to 30µV(rms), which is essential for RF-sensitive applications. Larger values (up to 1.0µF) further improve PSRR but slightly increase turn-on time.
Can MIC5255-2.85YM5-TR operate without any load connected to the OUT pin?
Yes, MIC5255-2.85YM5-TR remains stable and in regulation with zero load - a key differentiator from many LDOs. This makes it suitable for CMOS RAM keep-alive rails, RTC backup supplies, and other low-power applications where load current drops to 0µA during deep sleep. No minimum load resistor is required.
What is the thermal resistance (θJA) of the MIC5255-2.85YM5-TR package?
The MIC5255-2.85YM5-TR uses a 5-pin SOT-23 (M5) package with a junction-to-ambient thermal resistance (θJA) of 235°C/W on a standard PCB layout. With 1"² copper pour, θJA improves to 185°C/W. This allows continuous 150mA operation up to ~50°C ambient when VIN ≤5.4V, based on TJ(max) = 125°C and PD(max) = (125°C − TA)/θJA.
Is MIC5255-2.85YM5-TR pin-compatible with other MIC5255 variants in SOT-23-5?
Yes, all MIC5255-x.xYM5 and MIC5255-x.xBM5 variants share identical 5-pin SOT-23 pinout (IN, GND, EN, BYP, OUT), including MIC5255-2.85YM5-TR. Voltage variants differ only in internal feedback network - enabling direct substitution in existing layouts when output voltage tolerance and load requirements align.
MIC5255-2.85YM5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.85V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.25V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- 60dB ~ 50dB (10Hz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Under Voltage Lockout (UVLO)
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MIC5255-2.85YM5-TR FAQ
1.How can I place an order for MIC5255-2.85YM5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5255-2.85YM5-TR 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 MIC5255-2.85YM5-TR reliable?
The price and inventory of MIC5255-2.85YM5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5255-2.85YM5-TR is usually 5 days.
3.What payment methods are accepted for MIC5255-2.85YM5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5255-2.85YM5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5255-2.85YM5-TR?
MIC5255-2.85YM5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5255-2.85YM5-TR 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 MIC5255-2.85YM5-TR?
For technical support, including MIC5255-2.85YM5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5255-2.85YM5-TR requirements.
6.How does Aetrix verify that MIC5255-2.85YM5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5255-2.85YM5-TR 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 MIC5255-2.85YM5-TR meets industry standards.
7.What is the process for return or replacement of MIC5255-2.85YM5-TR?
All MIC5255-2.85YM5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5255-2.85YM5-TR, 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 MIC5255-2.85YM5-TR part is unused and in its original packaging.
Return procedure for MIC5255-2.85YM5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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