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Microchip Technology MIC5259-2.85BD5-TR
- Part No.:
- MIC5259-2.85BD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5259-2.85BD5-TR.pdf
- Description:
- IC REG LIN 2.85V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,414
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Product details
Overview
MIC5259-2.85BD5-TR from Micrel is a 2.85V, 300mA CMOS low-dropout linear regulator optimized for ultra-low-noise RF power rails, delivering 1.5% initial output accuracy, 300mV dropout at full load, and 30µVRMS output noise with 0.01µF bypass capacitor - deployed in cellular transceivers and battery-powered handhelds.
For engineers reviewing the MIC5259-2.85BD5-TR datasheet, MIC5259-2.85BD5-TR pinout, MIC5259-2.85BD5-TR application, or MIC5259-2.85BD5-TR equivalent, key selection criteria include PSRR performance at low VIN (70dB @ 1kHz), TTL-compatible enable logic, ceramic-capacitor stability, thermal shutdown behavior, and SOT-23-5 footprint compatibility with tight board-space constraints.
Technical Context
The MIC5259-2.85BD5-TR implements a CMOS-based error amplifier with active-clamp shutdown and quick-start reference bypass circuitry, enabling fast turn-on while maintaining sub-30µVRMS noise floor. Its internal architecture supports stable regulation down to 2.7V input with no minimum load requirement.
It integrates thermal shutdown (150°C trip, 10°C hysteresis), current limit (350–475mA), and under-voltage lockout - all operating within –40°C to +125°C junction range. The device uses a dedicated BYP pin to shunt reference noise, decoupling output ripple without affecting transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 2.85V ±1.5% initial accuracy - ensures precise biasing for RF ICs and ADC references. |
| Max Output Current | 300mA continuous - supports baseband processors and dual-band RF front-ends. |
| Dropout Voltage | 300mV @ 300mA - enables operation from single-cell Li-ion (3.0V min) with margin. |
| Output Noise | 30µVRMS (10Hz–100kHz, 0.01µF BYP) - meets stringent spectral purity requirements in GSM/UMTS receivers. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from DC-DC converters feeding the LDO input. |
| Quiescent Current | 105µA @ light load - extends battery life in always-on sensor or standby circuits. |
| Enable Logic | TTL-compatible (VIH ≥ 1.6V, VIL ≤ 0.4V) - interfaces directly with microcontroller GPIO without level-shifting. |
Pinout & Package
The MIC5259-2.85BD5-TR is housed in a 5-pin Thin SOT-23 (D5) package, 2.9mm × 1.6mm × 1.1mm, with exposed pad for thermal enhancement. Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = BYP, Pin 5 = OUT.
| 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 | Low-impedance return path for regulator core and load; connects to PCB ground plane. |
| 3 (EN) | Enable/Shutdown Input | Active-high TTL logic control; drives output to zero-current shutdown when pulled ≤0.4V. |
| 4 (BYP) | Noise Bypass Terminal | Connects 0.01µF–1.0µF capacitor to GND to reduce reference noise and improve PSRR. |
| 5 (OUT) | Regulated Output | Delivers stable 2.85V to load; requires ≥1µF ceramic output capacitor for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Output Noise | 30µVRMS with 0.01µF BYP cap - eliminates need for secondary LC filtering in sensitive RF supply rails. |
| Active Shutdown Clamp | Internal N-MOSFET discharges output capacitor on disable - prevents back-powering of downstream circuitry. |
| Ceramic Capacitor Stability | Stable with ≥1µF X7R/X5R ceramics (ESR ≤300mΩ) - eliminates tantalum or electrolytic capacitors, reducing size and failure risk. |
| No-Load Regulation | Maintains regulation at 0mA load - supports CMOS RAM keep-alive and real-time clock backup supplies. |
| High PSRR at Low VIN | 70dB @ 1kHz even at VIN = VOUT + 0.3V - preserves signal integrity when powered from buck converter ripple. |
Applications
| Cellular Transceiver Power | LTE Baseband Processor Core |
|---|---|
Use Scenario: Powers RF transceiver ICs (e.g., Qualcomm WTR series) in smartphones requiring clean 2.85V supply with minimal phase noise impact. IC Role / Device Role / Timing Role: Primary low-noise voltage source for VCO bias and mixer analog sections. Use Value: 30µVRMS noise and 70dB PSRR prevent reciprocal mixing and adjacent-channel interference in receive paths. | Use Scenario: Supplies core logic voltage to LTE baseband SoCs during active data transmission, where dynamic current steps exceed 200mA. IC Role / Device Role / Timing Role: High-bandwidth LDO delivering regulated 2.85V with fast transient response to handle burst-mode current demands. Use Value: 300mV dropout and active-clamp shutdown enable efficient use of 3.3V system rail while supporting rapid sleep/wake cycles. |
| Wearable Sensor Hub Supply | Industrial Handheld Scanner |
Use Scenario: Powers MEMS inertial measurement units (IMUs) and ultra-low-power MCUs in Bluetooth LE wearables operating from coin-cell batteries. IC Role / Device Role / Timing Role: Always-on precision regulator maintaining 2.85V for analog sensor front-end and ADC reference. Use Value: 105µA quiescent current and no-load stability extend shelf life and runtime without compromising measurement accuracy. | Use Scenario: Supplies barcode imaging sensor and laser driver in ruggedized industrial scanners powered by 3.7V Li-ion packs. IC Role / Device Role / Timing Role: Main system LDO providing fault-protected 2.85V to image processing ASIC and interface logic. Use Value: Integrated thermal shutdown (150°C) and current limit (475mA) prevent field failures during extended scanning duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS795285DRVR | 2.85V fixed, 250mA, 175mV dropout @ 250mA, 38µVRMS noise, 65dB PSRR @ 1kHz | Lower max current and higher noise - suitable only for lower-power RF sections or digital I/O rails. | Select when footprint compatibility with 2mm × 2mm DFN is required and 250mA suffices. |
| NCP1117ST285T3G | 2.85V fixed, 800mA, 1.2V dropout @ 800mA, 120µVRMS noise, no BYP pin, no enable | Higher dropout and noise - appropriate for non-RF digital subsystems where cost and current drive dominate. | Select when high current and cost sensitivity outweigh noise and enable functionality requirements. |
Compared with TPS795285DRVR and NCP1117ST285T3G, the MIC5259-2.85BD5-TR uniquely balances ultra-low noise (30µVRMS), TTL-enable control, and 300mV dropout in a 5-pin SOT-23 - making it optimal for space-constrained, battery-powered RF systems demanding both precision and programmability.
Availability
MIC5259-2.85BD5-TR is available at Aetrix Electronics and suitable for cellular transceivers, wearable sensor hubs, industrial handheld scanners, and LTE baseband processor cores requiring stable component supply across production lifecycles.
Supply support for MIC5259-2.85BD5-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 MIC5259 family was designed by Micrel specifically for ultra-low-noise, high-PSRR portable power applications - targeting RF front-ends, battery-powered instrumentation, and precision analog subsystems.
FAQ
What is the maximum input voltage rating for MIC5259-2.85BD5-TR?
The absolute maximum input voltage for MIC5259-2.85BD5-TR is +7V, but the recommended operating range is +2.7V to +6.0V per datasheet specifications. Exceeding 6.0V may trigger overvoltage protection or cause reliability degradation. For sustained operation, maintain VIN ≤ VOUT + 3.15V to ensure thermal safety at 300mA load in the SOT-23-5 package.
Does MIC5259-2.85BD5-TR require an external bypass capacitor, and what value is recommended?
Yes, MIC5259-2.85BD5-TR requires an external capacitor on the BYP pin (Pin 4) to achieve its specified 30µVRMS output noise. A 0.01µF ceramic capacitor (X7R/NPO) connected from BYP to GND is recommended. Values up to 1.0µF are acceptable and further reduce noise, though turn-on time increases slightly - verified in Micrel's Typical Characteristics plots.
Can MIC5259-2.85BD5-TR operate without any load connected to its output?
Yes, MIC5259-2.85BD5-TR remains stable and in regulation with zero load current - a feature explicitly confirmed in the Application Information section. This makes it suitable for CMOS RAM keep-alive, RTC backup, and other always-on low-power functions where load current may drop to 0µA between wake events.
What is the thermal shutdown behavior of MIC5259-2.85BD5-TR?
MIC5259-2.85BD5-TR activates thermal shutdown at 150°C junction temperature with 10°C hysteresis, meaning it resumes regulation only after cooling to ~140°C. During shutdown, the device disables output and draws <1µA quiescent current. This behavior is fully characterized across –40°C to +125°C ambient and protects against sustained overload or poor PCB thermal design.
Is MIC5259-2.85BD5-TR pin-compatible with other variants in the MIC5259 family?
Yes, all MIC5259-x.xBD5 variants share identical 5-pin Thin SOT-23 (D5) pinout: Pin 1 = IN, Pin 2 = GND, Pin 3 = EN, Pin 4 = BYP, Pin 5 = OUT. The MIC5259-2.85BD5-TR can be substituted for other BD5-suffix versions (e.g., MIC5259-3.0BD5-TR) without PCB changes - only output voltage and marking differ.
MIC5259-2.85BD5-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:
- Discontinued at Digi-Key
- 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):
- 0.55V @ 300mA
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 150 µA
- Current - Supply (Max):
- 250 µA
- PSRR:
- 65dB ~ 53dB (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
MIC5259-2.85BD5-TR FAQ
1.How can I place an order for MIC5259-2.85BD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5259-2.85BD5-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 MIC5259-2.85BD5-TR reliable?
The price and inventory of MIC5259-2.85BD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5259-2.85BD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5259-2.85BD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5259-2.85BD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5259-2.85BD5-TR?
MIC5259-2.85BD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5259-2.85BD5-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 MIC5259-2.85BD5-TR?
For technical support, including MIC5259-2.85BD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5259-2.85BD5-TR requirements.
6.How does Aetrix verify that MIC5259-2.85BD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5259-2.85BD5-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 MIC5259-2.85BD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5259-2.85BD5-TR?
All MIC5259-2.85BD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5259-2.85BD5-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 MIC5259-2.85BD5-TR part is unused and in its original packaging.
Return procedure for MIC5259-2.85BD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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