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Microchip Technology MIC5255-2.85YD5-TR
- Part No.:
- MIC5255-2.85YD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5255-2.85YD5-TR.pdf
- Description:
- IC REG LIN 2.85V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,959
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Product details
Overview
MIC5255-2.85YD5-TR from Micrel is a 150mA, 2.85V fixed-output, ultra-low-noise CMOS LDO voltage regulator in a 5-pin Thin SOT-23 (TSOT-23-5) package. It delivers 1% initial output accuracy, 135mV dropout at full load, and 30µV(rms) output noise - optimized for RF-sensitive battery-powered systems requiring clean, stable biasing of analog front-ends or PLLs.
For engineers reviewing the MIC5255-2.85YD5-TR datasheet, MIC5255-2.85YD5-TR pinout, MIC5255-2.85YD5-TR application, or MIC5255-2.85YD5-TR equivalent, key selection criteria include low-noise performance with bypass capacitor support, TTL-compatible enable control, ceramic-capacitor stability, and thermal shutdown protection in a 1mm-height footprint.
Technical Context
The MIC5255-2.85YD5-TR uses a CMOS pass transistor architecture with internal reference bypass capability via dedicated BYP pin. Its active-clamp shutdown circuit discharges the output during disable, preventing floating rail conditions in portable systems.
It operates across 2.7V–6.0V input range with guaranteed regulation over –40°C to +125°C junction temperature. Stability is ensured with ≥1µF low-ESR ceramic output capacitors and includes built-in current limit (160–425mA), thermal shutdown (150°C), and 10°C hysteresis.
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 rails or 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 - supports low-phase-noise VCOs, ADC references, and sensitive RF receivers. |
| Quiescent Current | 90µA typical - extends battery life in always-on monitoring circuits and standby modes. |
| Enable Threshold | VIL ≤ 0.4V, VIH ≥ 1.6V - compatible with 1.8V/3.3V GPIOs without level-shifting. |
| Thermal Shutdown | 150°C activation with 10°C hysteresis - prevents latch-up during transient overload or poor PCB heatsinking. |
| PSRR | 60dB @ 10Hz/100Hz, 50dB @ 10kHz - suppresses switching noise from DC-DC converters upstream. |
Pinout & Package
Package: 5-pin Thin SOT-23 (TSOT-23-5), 1mm height, JEDEC MO-253 compliant. Exposed pad not present - standard plastic leadframe construction.
| 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 | Common return path for input/output/bypass; must connect to low-impedance ground plane. |
| 3 - EN | Enable/Shutdown Input | TTL-compatible active-high control; <0.4V = shutdown (≈0.2µA IQ), >1.6V = enabled; must not float. |
| 4 - BYP | Noise Bypass Terminal | Connects to internal reference; 0.01µF–1.0µF capacitor to GND reduces output noise and improves PSRR. |
| 5 - OUT | Regulated Output | Delivers 2.85V ±1% to load; requires ≥1µF low-ESR ceramic capacitor (X7R/X5R) for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30µV(rms) with 0.01µF BYP capacitor - meets stringent spectral purity requirements for RF transceivers. |
| Active output discharge | Internal N-MOSFET clamp pulls OUT to GND when EN = low - prevents back-powering of downstream circuitry. |
| Ceramic capacitor stability | Stable with ≥1µF X7R/X5R ceramics (ESR ≤300mΩ) - eliminates need for bulky tantalum or electrolytic capacitors. |
| Tight load regulation | ≤2.5% variation from 0.1mA to 150mA load - maintains voltage integrity across sleep-to-active transitions. |
| Zero-off-mode current | 0.2µA max shutdown current - enables multi-year battery life in IoT sensor nodes with infrequent wake-ups. |
Applications
| Cellular Accessories | Bluetooth Audio Devices |
|---|---|
|
Use Scenario: Powering Bluetooth headset RF section and codec from single Li-ion cell. IC Role / Device Role / Timing Role: Low-noise 2.85V bias supply for RF synthesizer and audio DAC reference. Use Value: 30µV(rms) noise prevents reciprocal mixing and audible hiss; 135mV dropout preserves runtime down to 3.0V cell voltage. |
Use Scenario: Regulating power for Class-D amplifier and BLE SoC in wireless earbuds. IC Role / Device Role / Timing Role: Primary LDO delivering clean 2.85V to mixed-signal subsystems with fast enable control. Use Value: Active discharge on EN deassertion prevents pop/click during connection handshaking; 90µA IQ extends standby time. |
| Medical Wearables | Industrial Sensor Nodes |
|
Use Scenario: Supplying ECG front-end amplifier and SAR ADC in patch-style monitor. IC Role / Device Role / Timing Role: Precision, low-drift voltage source for analog signal chain biasing. Use Value: 1% initial accuracy and 2% over-temperature drift ensure measurement repeatability; no-load stability avoids brownout during intermittent sampling. |
Use Scenario: Powering LoRaWAN transceiver and MEMS accelerometer in battery-operated condition monitor. IC Role / Device Role / Timing Role: Always-on LDO enabling rapid wake-from-sleep response with minimal quiescent drain. Use Value: 0.2µA shutdown current allows 10+ year battery life at 1-minute wake intervals; thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-285I/TT | 300mA rating, 170mV dropout at 250mA, 33µV(rms) noise, SOT-23-5 package. | Higher current capacity but larger dropout; lacks dedicated BYP pin for noise optimization. | Select when >150mA load or higher PSRR at >100kHz is required; verify layout compatibility with higher thermal dissipation. |
| TCS2117-285IDBVR | 200mA rating, 125mV dropout at 150mA, 25µV(rms) noise, same TSOT-23-5 footprint. | Lower dropout and noise, but no active output discharge; enable threshold differs (VIL = 0.8V). | Prefer for ultra-low-noise, low-dropout priority where output discharge is handled externally; confirm GPIO compatibility with 0.8V VIL. |
Compared with MCP1700T-285I/TT and TCS2117-285IDBVR, the MIC5255-2.85YD5-TR uniquely combines active output discharge, dedicated noise-bypass pin, and 1% initial accuracy in a 1mm-height TSOT-23-5 - making it optimal for space-constrained, RF-critical, battery-powered designs requiring deterministic shutdown behavior.
Availability
MIC5255-2.85YD5-TR is available at Aetrix Electronics and suitable for cellular accessories, Bluetooth audio devices, medical wearables, and industrial sensor nodes requiring stable component supply with consistent parametric performance across temperature and production lots.
Supply support for MIC5255-2.85YD5-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.
The MIC5255 family was designed for ultra-low-noise, low-quiescent-current regulation in handheld and battery-powered RF systems - emphasizing ceramic-capacitor compatibility, compact packaging, and deterministic shutdown behavior.
FAQ
What is the maximum input voltage for MIC5255-2.85YD5-TR?
The absolute maximum input voltage for MIC5255-2.85YD5-TR is +7V, but the recommended operating range is +2.7V to +6.0V per datasheet specifications. Exceeding 6.0V may trigger internal protection or degrade long-term reliability, even if within absolute ratings. For 2.85V output, typical use cases operate from 3.0V–5.5V inputs to maintain adequate dropout margin and thermal safety.
Does MIC5255-2.85YD5-TR require an external bypass capacitor on the BYP pin?
The BYP pin of MIC5255-2.85YD5-TR is optional but strongly recommended for low-noise applications: a 0.01µF capacitor to GND reduces output noise to 30µV(rms) and improves PSRR. Leaving BYP open yields higher noise (typ. 120µV(rms)), so the capacitor is essential for RF or precision analog use. The pin may be left unconnected only if noise performance is non-critical.
Can MIC5255-2.85YD5-TR operate without a load?
Yes, MIC5255-2.85YD5-TR remains stable and in regulation with zero load - a key feature confirmed in the datasheet's "No-Load Stability" section. This makes it suitable for CMOS RAM keep-alive, real-time clock backup, or other always-on circuits where output capacitance alone sustains regulation without minimum load requirements.
What is the thermal resistance (θJA) of MIC5255-2.85YD5-TR in its TSOT-23-5 package?
The junction-to-ambient thermal resistance (θJA) for MIC5255-2.85YD5-TR in the 5-pin Thin SOT-23 package is 235°C/W under standard minimum-footprint PCB conditions. This value assumes a 1-inch square copper area; improved layout with thermal vias or larger copper pours can reduce θJA to ~185°C/W, directly increasing allowable power dissipation before thermal shutdown.
Is MIC5255-2.85YD5-TR pin-compatible with other MIC5255 variants in the same package?
Yes, all MIC5255-x.xYD5 variants share identical pinout, package dimensions, and electrical interface in the TSOT-23-5 package. The only difference is output voltage (e.g., 2.5V, 2.85V, 3.3V); therefore, MIC5255-2.85YD5-TR can be substituted for other YD5 versions without PCB changes - provided system-level voltage tolerance and load requirements are verified.
MIC5255-2.85YD5-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- 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:
- TSOT-23-5
MIC5255-2.85YD5-TR FAQ
1.How can I place an order for MIC5255-2.85YD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5255-2.85YD5-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 MIC5255-2.85YD5-TR reliable?
The price and inventory of MIC5255-2.85YD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5255-2.85YD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5255-2.85YD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5255-2.85YD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5255-2.85YD5-TR?
MIC5255-2.85YD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5255-2.85YD5-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 MIC5255-2.85YD5-TR?
For technical support, including MIC5255-2.85YD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5255-2.85YD5-TR requirements.
6.How does Aetrix verify that MIC5255-2.85YD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5255-2.85YD5-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 MIC5255-2.85YD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5255-2.85YD5-TR?
All MIC5255-2.85YD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5255-2.85YD5-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 MIC5255-2.85YD5-TR part is unused and in its original packaging.
Return procedure for MIC5255-2.85YD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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