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Microchip Technology MIC5255-2.9YD5-TR
- Part No.:
- MIC5255-2.9YD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5255-2.9YD5-TR.pdf
- Description:
- IC REG LIN 2.9V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,254
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Product details
Overview
MIC5255-2.9YD5-TR from Micrel is a 2.9V, 150mA ultra-low-noise CMOS LDO voltage regulator in a 5-pin Thin SOT-23-5 package. It delivers 1% initial output accuracy, 135mV dropout at full load, and 30µV(rms) output noise-enabling clean power for RF front-ends in compact portable devices.
For engineers reviewing the MIC5255-2.9YD5-TR datasheet, MIC5255-2.9YD5-TR pinout, MIC5255-2.9YD5-TR application, or MIC5255-2.9YD5-TR equivalent, key selection criteria include low-noise performance with ceramic capacitors, TTL-compatible enable control, thermal shutdown protection, and compatibility with battery-powered systems requiring stable 2.9V rail generation.
Technical Context
The MIC5255-2.9YD5-TR uses a CMOS pass element with active-clamp shutdown and internal reference bypassing via dedicated BYP pin. Its architecture supports fast transient response and maintains regulation down to zero load while drawing only 90µA quiescent current.
It operates across 2.7V–6.0V input range, achieves 2.0% output accuracy over –40°C to +125°C, and provides 60dB PSRR at 10Hz/100Hz with 50dB at 10kHz-critical for noise-sensitive analog and RF circuitry powered from noisy battery or DC-DC sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.9V ±1% (initial), ±2% over temperature - ensures stable bias for 2.9V logic or RF ICs without external trimming. |
| Max Output Current | 150mA - sufficient for powering baseband processors, RF transceivers, or sensor subsystems in handheld devices. |
| Dropout Voltage | 135mV @ 150mA - enables operation from single-cell Li-ion (3.0V min) or dual-cell alkaline with margin. |
| Output Noise | 30µV(rms), 10Hz–100kHz - meets stringent spectral purity requirements for VCOs, PLLs, and low-phase-noise receivers. |
| Quiescent Current | 90µA - minimizes standby power loss in always-on circuits like real-time clocks or keep-alive RAM. |
| Enable Threshold | VIL ≤ 0.4V, VIH ≥ 1.6V - compatible with standard CMOS/TTL logic without level-shifting. |
| Thermal Shutdown | 150°C with 10°C hysteresis - protects against sustained overload or poor PCB thermal design in sealed enclosures. |
Pinout & Package
Package: 5-pin Thin SOT-23-5 (1mm height), footprint identical to standard SOT-23-5 but optimized for space-constrained portable designs.
| 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, and enable; must be low-impedance connection to minimize noise coupling. |
| 3 - EN | Enable/Shutdown Input | TTL-compatible active-high control; logic low disables regulator and reduces supply current to <1µA. |
| 4 - BYP | Noise Bypass Terminal | Connects to 0.01µF capacitor to reduce reference noise; improves PSRR and lowers output RMS noise to 30µV. |
| 5 - OUT | Regulated Output | Delivers stable 2.9V ±1%; requires ≥1µF low-ESR ceramic capacitor for loop stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-noise regulation | 30µV(rms) output noise with 0.01µF BYP capacitor - directly supports RF signal chain integrity without additional filtering. |
| Zero-off-mode current | Sub-1µA shutdown current - extends battery life in sleep modes of pagers, Bluetooth headsets, and IoT sensors. |
| Ceramic capacitor stability | Stable with ≥1µF X7R/X5R ceramic output cap (ESR ≤300mΩ) - eliminates need for bulky tantalum or electrolytic capacitors. |
| Active output discharge | Internal N-MOSFET clamp discharges OUT when disabled - prevents floating voltage on downstream circuitry during power sequencing. |
| No-load regulation | Maintains 2.9V output with 0mA load - essential for CMOS RAM backup, RTC, or microcontroller brown-out detection circuits. |
Applications
| Cellular Front-End Power | Portable Audio Codec Supply |
|---|---|
Use Scenario: Powering RF transceiver VCO, LNA, and mixer stages in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Low-noise 2.9V bias source replacing noisier switching regulators or higher-dropout LDOs. Use Value: 30µV(rms) noise floor prevents reciprocal mixing and phase noise degradation in receive paths. | Use Scenario: Supplying high-resolution audio DAC/ADC and headphone amplifier in Bluetooth earbuds. IC Role / Device Role / Timing Role: Clean analog rail generator decoupled from digital core supply. Use Value: Enables >95dB SNR in audio converters by eliminating switching ripple-induced distortion. |
| Wireless Sensor Node Core | Low-Power MCU Keep-Alive Rail |
Use Scenario: Providing regulated 2.9V to sub-GHz transceiver and ultra-low-power MCU in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Primary system LDO with enable control synchronized to wake-up intervals. Use Value: 90µA quiescent current and zero-off-mode operation extend 10-year battery life in LoRaWAN nodes. | Use Scenario: Maintaining voltage to SRAM and RTC during deep-sleep states in wearables and medical patches. IC Role / Device Role / Timing Role: Always-on LDO with no-load stability and minimal leakage. Use Value: Eliminates need for external hold-up capacitors or secondary regulators in memory retention circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2029PDQNR | 2.9V output, 300mA rating, 12µV(rms) noise, 0.5µA IQ - lower noise but higher cost and larger footprint. | Preferred for ultra-low-noise precision analog where 12µV(rms) is mandatory; not drop-in due to different pinout and enable polarity. | Select when noise budget is tighter than 30µV(rms) and board area allows 6-pin WSON package. |
| MCP1700T-2902E/TT | 2.9V output, 250mA rating, 80µV(rms) noise, 1.6µA IQ - higher noise, higher quiescent current, same SOT-23-5 footprint. | Suitable for cost-sensitive consumer electronics where moderate noise is acceptable and 1.6µA IQ is tolerable. | Choose for non-RF applications like LED drivers or basic microcontroller rails where noise sensitivity is low. |
Compared with TPS7A2029PDQNR and MCP1700T-2902E/TT, the MIC5255-2.9YD5-TR offers optimal balance of ultra-low noise (30µV), ultra-low IQ (90µA), and proven RF-grade stability in the industry-standard Thin SOT-23-5 package-making it ideal for space-constrained, battery-powered RF systems.
Availability
MIC5255-2.9YD5-TR is available at Aetrix Electronics and suitable for cellular front-end power, portable audio codec supply, and wireless sensor node core applications requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MIC5255-2.9YD5-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 analog, power management, and timing solutions before its acquisition by Microchip Technology in 2015.
The MIC5255 product line was designed for ultra-low-noise, low-quiescent-current regulation in battery-powered RF and portable electronics-targeting applications where clean, efficient, and compact power delivery is critical.
FAQ
What is the maximum input voltage for MIC5255-2.9YD5-TR?
The absolute maximum input voltage for MIC5255-2.9YD5-TR is +7V, but the recommended operating range is +2.7V to +6.0V per the datasheet. Exceeding 6.0V may trigger thermal shutdown or degrade long-term reliability, especially under high ambient temperatures or heavy load conditions. The device's dropout behavior remains specified only within the 2.7V–6.0V range.
Does MIC5255-2.9YD5-TR require an external bypass capacitor on the BYP pin?
MIC5255-2.9YD5-TR does not require the BYP pin to be used-it may be left open-but connecting a 0.01µF capacitor from BYP to GND reduces output noise to 30µV(rms) and improves PSRR. This is strongly recommended for RF and precision analog applications. Larger values (up to 1.0µF) further reduce noise but slightly increase turn-on time.
Can MIC5255-2.9YD5-TR operate without any load connected to the OUT pin?
Yes, MIC5255-2.9YD5-TR maintains regulation and stability with zero load-a key feature confirmed in the datasheet's "No-Load Stability" section. This makes it suitable for CMOS RAM keep-alive, RTC backup, and other always-on low-current applications where traditional LDOs may oscillate or drift without minimum load.
What is the thermal resistance (θJA) of MIC5255-2.9YD5-TR in its Thin SOT-23-5 package?
The junction-to-ambient thermal resistance (θJA) for MIC5255-2.9YD5-TR in the 5-pin Thin SOT-23-5 (D5) package is 235°C/W on a standard PCB layout with minimum copper footprint. With 1-inch square copper pour, θJA improves to 185°C/W, enabling higher continuous current capability at elevated ambient temperatures.
Is MIC5255-2.9YD5-TR pin-compatible with other MIC5255 variants in the same package?
Yes, all MIC5255 variants in the Thin SOT-23-5 (D5) package-including MIC5255-2.9YD5-TR-share identical pinout, footprint, and electrical interface. Only the output voltage differs between part numbers; no PCB redesign is needed when substituting between 2.5V–3.3V D5 variants in the same design.
MIC5255-2.9YD5-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):
- 2.9V
- 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
MIC5255-2.9YD5-TR FAQ
1.How can I place an order for MIC5255-2.9YD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5255-2.9YD5-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 MIC5255-2.9YD5-TR reliable?
The price and inventory of MIC5255-2.9YD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5255-2.9YD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5255-2.9YD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5255-2.9YD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5255-2.9YD5-TR?
MIC5255-2.9YD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5255-2.9YD5-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 MIC5255-2.9YD5-TR?
For technical support, including MIC5255-2.9YD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5255-2.9YD5-TR requirements.
6.How does Aetrix verify that MIC5255-2.9YD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5255-2.9YD5-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 MIC5255-2.9YD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5255-2.9YD5-TR?
All MIC5255-2.9YD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5255-2.9YD5-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 MIC5255-2.9YD5-TR part is unused and in its original packaging.
Return procedure for MIC5255-2.9YD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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