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Microchip Technology MIC5259-3.3BD5-TR
- Part No.:
- MIC5259-3.3BD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5259-3.3BD5-TR.pdf
- Description:
- IC REG LIN 3.3V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,206
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Product details
Overview
MIC5259-3.3BD5-TR from Micrel is a 3.3V, 300mA CMOS low-dropout linear regulator optimized for RF and battery-powered systems. It delivers 1.5% initial output accuracy, 300mV dropout at full load, and ultra-low 30µV(rms) output noise with a dedicated noise-bypass pin. Used in cellular accessories and portable computing where clean, stable voltage rails are critical.
For engineers reviewing the MIC5259-3.3BD5-TR datasheet, MIC5259-3.3BD5-TR pinout, MIC5259-3.3BD5-TR application, or MIC5259-3.3BD5-TR equivalent, key selection criteria include PSRR (70dB @ 1kHz), thermal shutdown (150°C), TTL-compatible enable input, and ceramic-capacitor stability - all verified for the 5-pin Thin SOT-23 package.
Technical Context
The MIC5259-3.3BD5-TR integrates a precision bandgap reference, error amplifier, and active-clamp shutdown circuit to achieve fast transient response and zero-current disable mode. Its architecture supports operation down to 2.7V input while maintaining regulation across –40°C to +125°C junction temperature.
It uses a CMOS pass element enabling low quiescent current (105µA typical at light load) and high PSRR even near dropout. The dedicated BYP pin connects to a 0.01µF capacitor to shunt reference noise, reducing output noise by >50% versus bypass-open configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±1.5% initial accuracy - ensures compatible logic-level supply for 3.3V microcontrollers and RF ICs without external trimming. |
| Dropout Voltage | 300mV @ 300mA - enables regulation from 3.6V input, supporting single-cell Li-ion or dual-cell alkaline operation. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from DC/DC converters upstream, critical for sensitive analog/RF stages. |
| Output Noise | 30µV(rms), 10Hz–100kHz - meets stringent spectral purity requirements of VCOs, PLLs, and ADC reference supplies. |
| Quiescent Current | 105µA typical @ light load - extends battery life in always-on monitoring circuits and low-power sleep modes. |
| Enable Threshold | VIL ≤ 0.4V, VIH ≥ 1.6V - interfaces directly with 1.8V/3.3V GPIO without level-shifting, simplifying host control. |
| Thermal Shutdown | 150°C with 10°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal layout. |
Pinout & Package
Package: 5-pin Thin SOT-23 (D5), 2.9mm × 1.6mm footprint, 1.1mm max height - suitable for space-constrained handheld PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Supply Input | Accepts 2.7V–6.0V unregulated input; requires 1.0µF ceramic bypass to GND for stability. |
| 2 (GND) | Ground Reference | Low-impedance return path for regulator core and load; must be connected to system ground plane. |
| 3 (EN) | Enable/Shutdown Input | TTL-compatible active-high control; drives output ON when ≥1.6V, OFF when ≤0.4V; must not float. |
| 4 (BYP) | Noise Bypass | Connects to 0.01µF capacitor to GND to reduce reference noise; optional but required for <30µV(rms) spec. |
| 5 (OUT) | Regulated Output | Delivers 3.3V ±1.5% to load; requires ≥1.0µF ceramic output capacitor with ESR ≤300mΩ. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-noise regulation | 30µV(rms) output noise with 0.01µF BYP capacitor - enables direct powering of RF front-ends without additional filtering. |
| Active-clamp shutdown | Discharges output capacitor on disable - prevents residual voltage hold-up on downstream circuitry during power sequencing. |
| Ceramic-capacitor stability | Stable with 1.0µF X7R/X5R ceramic output cap - eliminates need for larger, less reliable tantalum or electrolytic capacitors. |
| High PSRR at low VIN | 70dB @ 1kHz even at VIN = VOUT + 0.3V - maintains noise rejection as battery discharges below 3.6V. |
| No-load regulation | Maintains 3.3V output with zero load current - supports CMOS RAM keep-alive and real-time clock backup rails. |
Applications
| Cellular Accessories | Laptop Subsystem Power |
|---|---|
Use Scenario: USB-powered Bluetooth headsets and LTE modems requiring clean 3.3V rail for RF transceivers and baseband processors. IC Role / Device Role / Timing Role: Primary LDO supplying VDD_IO and VDD_AFE for wireless SoCs, replacing noisier switching regulators. Use Value: 30µV(rms) noise and 70dB PSRR prevent TX spectral regrowth and RX desensitization in co-located RF modules. | Use Scenario: Always-on subsystems in notebooks (e.g., keyboard controller, touchpad, lid-open sensor) powered from main battery. IC Role / Device Role / Timing Role: Standby LDO delivering regulated 3.3V during S3/S4 sleep states with <1µA shutdown current. Use Value: "Zero" off-mode current (0.2µA typical) minimizes battery drain over weeks of idle time. |
| Industrial Handheld Scanners | PC Peripheral Audio |
Use Scenario: Ruggedized barcode scanners using CMOS image sensors and laser drivers, operating from 3.7V Li-ion cells. IC Role / Device Role / Timing Role: Main supply LDO for sensor interface ASIC and flash memory, with EN controlled by MCU GPIO. Use Value: 300mV dropout allows >3.6V operation until battery reaches 3.6V, maximizing usable cell capacity. | Use Scenario: USB DACs and gaming headsets needing low-noise analog supply for op-amps and ADC/DAC cores. IC Role / Device Role / Timing Role: Post-regulator cleaning up noisy 5V USB bus to deliver quiet 3.3V reference voltage. Use Value: Dedicated BYP pin and 30µV(rms) noise eliminate audible hiss and improve SNR by >3dB in audio signal chain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP2112K-3.3TRG1 | Fixed 3.3V output, 600mA rating, 400mV dropout @ 600mA, no BYP pin, PSRR = 60dB @ 1kHz | Higher current capability but higher noise (50µV(rms)) and no noise-bypass option - unsuitable for RF-sensitive designs | Select only if >300mA load current or cost sensitivity outweighs noise/PSRR requirements |
| TCS2117-3301 | 3.3V output, 300mA, 250mV dropout @ 300mA, 45µV(rms) noise, no BYP pin, PSRR = 65dB @ 1kHz | Lower dropout but higher noise and no bypass capability - acceptable for digital-only loads, not RF/analog | Prefer when board space is tighter (SOT-23-4) and noise performance is secondary to dropout |
Compared with AP2112K-3.3TRG1 and TCS2117-3301, the MIC5259-3.3BD5-TR uniquely provides a dedicated noise-bypass pin enabling sub-30µV(rms) operation - a decisive advantage for RF, precision ADC, and low-phase-noise clocking applications where spectral purity is non-negotiable.
Availability
MIC5259-3.3BD5-TR is available at Aetrix Electronics and suitable for cellular accessories, industrial handheld scanners, and laptop subsystem power requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MIC5259-3.3BD5-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 analog and mixed-signal semiconductor company headquartered in San Jose, CA, acquired by Microchip Technology in 2015. Known for high-performance power management and timing solutions.
The MIC5259 family was designed specifically for ultra-low-noise, high-PSRR regulation in battery-powered RF and portable electronics - emphasizing ceramic-capacitor compatibility, fast transient response, and zero-current shutdown.
FAQ
What is the maximum input voltage for MIC5259-3.3BD5-TR?
The absolute maximum input voltage for MIC5259-3.3BD5-TR is +7V, but the recommended operating range is +2.7V to +6.0V per datasheet specifications. Exceeding 6.0V risks violating safe operating area limits and may trigger internal protection circuits. For reliable 3.3V output regulation, VIN must remain ≥3.6V to maintain 300mV headroom above dropout.
Does MIC5259-3.3BD5-TR require an external bypass capacitor on the BYP pin?
While MIC5259-3.3BD5-TR functions without the BYP capacitor, the 30µV(rms) output noise specification is only guaranteed when a 0.01µF capacitor is connected between BYP (pin 4) and GND. Omitting it increases noise to ~55µV(rms), degrading performance in RF and precision analog applications.
Can MIC5259-3.3BD5-TR operate with zero load current?
Yes, MIC5259-3.3BD5-TR remains stable and in regulation with no load - a 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-power circuits where load current drops to zero.
What is the thermal resistance (θJA) of MIC5259-3.3BD5-TR in its SOT-23-5 package?
The junction-to-ambient thermal resistance (θJA) for MIC5259-3.3BD5-TR in the 5-pin Thin SOT-23 package is 235°C/W under standard JEDEC test conditions. Layout-dependent values range from 185°C/W (1"² copper) to 145°C/W (minimum footprint), as specified in the Thermal Considerations section of the datasheet.
Is MIC5259-3.3BD5-TR pin-compatible with other MIC5259 variants in the same package?
Yes, all MIC5259-x.xBD5 variants share identical 5-pin Thin SOT-23 pinout and electrical behavior - only the fixed output voltage differs. Replacing MIC5259-3.3BD5-TR with MIC5259-2.8BD5-TR or MIC5259-1.8BD5-TR requires no PCB changes, provided the new voltage meets downstream IC requirements.
MIC5259-3.3BD5-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):
- 3.3V
- 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
MIC5259-3.3BD5-TR FAQ
1.How can I place an order for MIC5259-3.3BD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5259-3.3BD5-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 MIC5259-3.3BD5-TR reliable?
The price and inventory of MIC5259-3.3BD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5259-3.3BD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5259-3.3BD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5259-3.3BD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5259-3.3BD5-TR?
MIC5259-3.3BD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5259-3.3BD5-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 MIC5259-3.3BD5-TR?
For technical support, including MIC5259-3.3BD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5259-3.3BD5-TR requirements.
6.How does Aetrix verify that MIC5259-3.3BD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5259-3.3BD5-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 MIC5259-3.3BD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5259-3.3BD5-TR?
All MIC5259-3.3BD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5259-3.3BD5-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 MIC5259-3.3BD5-TR part is unused and in its original packaging.
Return procedure for MIC5259-3.3BD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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