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Microchip Technology MIC5305-2.9YD5-TR
- Part No.:
- MIC5305-2.9YD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5305-2.9YD5-TR.pdf
- Description:
- IC REG LIN 2.9V 150MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,767
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Product details
Overview
MIC5305-2.9YD5-TR from Micrel is a fixed-output 2.9V, 150mA ultra-low-dropout linear regulator in a thin SOT-23-5 package, featuring 60mV dropout at full load, 20µVrms output noise, and 85dB PSRR at 1kHz - deployed in audio codec power supplies and portable electronics where low-noise, battery-efficient regulation is critical.
For engineers reviewing the MIC5305-2.9YD5-TR datasheet, MIC5305-2.9YD5-TR pinout, MIC5305-2.9YD5-TR application, or MIC5305-2.9YD5-TR equivalent, key selection criteria include dropout voltage under 150mA load, ground current below 150µA across temperature, ceramic capacitor stability with 1µF COUT, and enable pin compatibility with 1.0V logic-high threshold.
Technical Context
The MIC5305-2.9YD5-TR integrates a CMOS-based LDO core with thermal shutdown and current limit protection, using an internal 1.25V reference and error amplifier to maintain ±1.0% initial output accuracy. Its quick-start circuit enables stable startup with 0.1µF bypass capacitance while limiting turn-on time to ≤100µs.
It operates across 2.25V–5.5V input range with logic-compatible active-high enable (VIH = 1.0V, VIL = 0.2V), draws only 0.5µA in shutdown, and sustains regulation down to zero load - eliminating need for dummy loads in keep-alive RAM applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.9V ±1.0% initial accuracy ensures precise biasing for 2.85V–2.95V-tolerant analog circuits. |
| Dropout Voltage | 60mV @ 150mA allows operation with VIN as low as 2.96V - critical for single-cell Li-ion or Li-poly systems near end-of-discharge. |
| Ground Current | 90µA typical at light load reduces quiescent power loss in always-on subsystems like real-time clocks. |
| PSRR | 85dB @ 1kHz suppresses switching noise from adjacent DC/DC converters feeding shared input rails. |
| Output Noise | 20µVrms (10Hz–100kHz) prevents audible hiss in audio codec VDD lines and ADC reference paths. |
| Enable Threshold | Logic-high enable at ≥1.0V supports direct interface with 1.8V/3.3V GPIO without level-shifting. |
| Thermal Shutdown | Activates at TJ ≥125°C - protects device during sustained 150mA operation in confined PCB layouts with minimal copper. |
Pinout & Package
Package: Thin SOT-23-5 (TSOT-23-5), 2.9mm × 1.6mm × 1.1mm body height, exposed pad thermally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VIN | Supply Input | Accepts 2.25V–5.5V; requires 1µF low-ESR ceramic bypass to GND for stability. |
| 2 - GND | Ground Reference | Common return for load, bypass cap, and exposed pad; must be low-impedance connection. |
| 3 - EN | Enable Input | Active-high CMOS input; VIH ≥1.0V enables regulator, VIL ≤0.2V disables to 0.5µA shutdown current. |
| 4 - BYP | Reference Bypass | Connects 0.1µF ceramic to GND to reduce output noise by 20µVrms and improve PSRR. |
| 5 - VOUT | Regulated Output | Delivers 2.9V ±1.0% to load; stable with ≥1µF X7R/X5R ceramic capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| µCap Ceramic Stability | Stable with 1µF X7R ceramic output capacitor - eliminates need for tantalum or electrolytic caps, reducing board area and cost. |
| Zero-Off-Mode Current | 0.5µA shutdown current enables true power gating in battery-backed subsystems without leakage concerns. |
| No-Load Regulation | Maintains 2.9V output with 0mA load - essential for CMOS RAM keep-alive and standby logic rails. |
| Fast Turn-On | ≤100µs startup with 1µF COUT and 0.1µF BYP - meets timing requirements for rapid wake-from-sleep sequences. |
| High PSRR Architecture | 85dB rejection at 1kHz achieved via optimized error amplifier gain and internal reference bypass path. |
Applications
| Cellular Phone Power Rails | Fiber Optic Module Bias |
|---|---|
Use Scenario: Supplying low-noise 2.9V to RF transceiver analog sections and PLL VCOs in 4G/LTE handsets. IC Role / Device Role / Timing Role: Primary LDO delivering clean, regulated bias independent of noisy PMIC switcher outputs. Use Value: 20µVrms noise prevents phase jitter in VCOs; 60mV dropout extends talk time by enabling operation down to 2.96V VIN. | Use Scenario: Providing stable 2.9V to laser diode driver ICs and photodiode amplifiers in SFP+ optical transceivers. IC Role / Device Role / Timing Role: Low-noise post-regulator isolating sensitive analog front-end from digital control domain. Use Value: 85dB PSRR rejects 100kHz–1MHz switching noise from host controller DC/DC, preserving signal integrity. |
| Audio Codec VDD Supply | Notebook PC Subsystem Rail |
Use Scenario: Powering DAC/ADC analog cores and headphone amplifier stages in portable media players. IC Role / Device Role / Timing Role: Dedicated low-noise LDO decoupling audio signal chain from shared system rail. Use Value: 20µVrms output noise avoids audible hiss; ±1.0% accuracy ensures consistent dynamic range across units. | Use Scenario: Delivering 2.9V to embedded controller (EC) or secure boot ROM in ultrabook platforms. IC Role / Device Role / Timing Role: Always-on LDO maintaining firmware execution context during S3/S4 sleep states. Use Value: Zero-load stability and 90µA quiescent current prevent battery drain during multi-day standby. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-2902E/TT | 250mA rated, 1.6µA quiescent current, 170mV dropout @ 250mA, SOT-23-5 package. | Higher IOUT and lower IQ suit longer battery life in sensor nodes, but higher dropout limits use in low-VIN scenarios. | Select when >150mA load headroom or sub-2µA IQ is required; verify 170mV dropout meets minimum VIN margin. |
| Torex XC6206P292MR-G | 150mA rated, 1µA IQ, 150mV dropout @ 150mA, SOT-23-5 package, no BYP pin. | Lacks bypass pin - cannot achieve 20µVrms noise; better for cost-sensitive, non-audio applications. | Choose for ultra-low-power always-on rails where noise <20µVrms is not required and footprint compatibility is critical. |
Compared with MCP1700T-2902E/TT and XC6206P292MR-G, the MIC5305-2.9YD5-TR uniquely balances ultra-low dropout (60mV), low noise (20µVrms), and integrated BYP functionality in a standard SOT-23-5 - making it optimal for noise-sensitive, battery-constrained analog subsystems.
Availability
MIC5305-2.9YD5-TR is available at Aetrix Electronics and suitable for cellular phone power rails, fiber optic module bias, and audio codec power supplies requiring stable component supply across industrial temperature range (–40°C to +125°C).
Supply support for MIC5305-2.9YD5-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 high-performance analog and mixed-signal ICs, acquired by Microchip Technology in 2015.
The MIC5305 product line delivers µCap ultra-low-dropout regulators optimized for space-constrained, battery-powered portable electronics demanding low noise, fast transient response, and ceramic capacitor compatibility.
FAQ
What is the maximum input voltage rating for the MIC5305-2.9YD5-TR?
The MIC5305-2.9YD5-TR has an absolute maximum input voltage (VIN) rating of 6V. Its recommended operating input range is 2.25V to 5.5V. Exceeding 6V may cause permanent damage. For reliable operation at 5.5V input with 2.9V output and 150mA load, power dissipation is ~0.32W - ensure adequate PCB copper area per the 93°C/W θJA spec to maintain junction temperature below 125°C.
Does the MIC5305-2.9YD5-TR require an external bypass capacitor on the BYP pin?
The MIC5305-2.9YD5-TR does not require the BYP pin to be used, but connecting a 0.1µF ceramic capacitor from BYP to GND reduces output noise from ~35µVrms to 20µVrms and improves PSRR by up to 20dB at 1kHz. Omitting the BYP capacitor increases noise and degrades ripple rejection - critical in audio and RF applications where the MIC5305-2.9YD5-TR is commonly deployed.
Can the MIC5305-2.9YD5-TR operate with no load connected to VOUT?
Yes, the MIC5305-2.9YD5-TR remains stable and maintains regulation with zero load current - a key differentiator from many legacy LDOs. This capability is explicitly verified in the datasheet and enables direct use in CMOS RAM keep-alive circuits, real-time clock backup rails, and other always-on subsystems where load current drops to 0µA during deep sleep modes.
What is the thermal resistance (θJA) of the MIC5305-2.9YD5-TR in its TSOT-23-5 package?
The MIC5305-2.9YD5-TR in the thin SOT-23-5 (D5) package has a junction-to-ambient thermal resistance (θJA) of 235°C/W, as specified in the datasheet. This value assumes minimal PCB copper; adding thermal vias to inner-layer ground planes can significantly reduce effective θJA. For example, at 150mA load and 5.0V input, power dissipation is ~0.32W - resulting in ~75°C rise above ambient with 235°C/W, requiring careful thermal layout in enclosed environments.
Is the MIC5305-2.9YD5-TR pin-compatible with other variants in the MIC5305 family?
Yes, all MIC5305 variants in the same package type share identical pinouts. The MIC5305-2.9YD5-TR uses the TSOT-23-5 (D5) footprint with VIN on pin 1, GND on pin 2, EN on pin 3, BYP on pin 4, and VOUT on pin 5 - matching MIC5305-1.5YD5, MIC5305-3.3YD5, and other -YD5 suffix parts. Fixed-output versions do not use the ADJ pin (absent in D5), ensuring drop-in replacement across output voltages within the same package.
MIC5305-2.9YD5-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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.85V @ 150mA
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- -
- PSRR:
- 85dB ~ 65dB (1kHz ~ 10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MIC5305-2.9YD5-TR FAQ
1.How can I place an order for MIC5305-2.9YD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5305-2.9YD5-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 MIC5305-2.9YD5-TR reliable?
The price and inventory of MIC5305-2.9YD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5305-2.9YD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5305-2.9YD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5305-2.9YD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5305-2.9YD5-TR?
MIC5305-2.9YD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5305-2.9YD5-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 MIC5305-2.9YD5-TR?
For technical support, including MIC5305-2.9YD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5305-2.9YD5-TR requirements.
6.How does Aetrix verify that MIC5305-2.9YD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5305-2.9YD5-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 MIC5305-2.9YD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5305-2.9YD5-TR?
All MIC5305-2.9YD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5305-2.9YD5-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 MIC5305-2.9YD5-TR part is unused and in its original packaging.
Return procedure for MIC5305-2.9YD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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