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Microchip Technology MIC5259-4.75BD5-TR
- Part No.:
- MIC5259-4.75BD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5259-4.75BD5-TR.pdf
- Description:
- IC REG LIN 4.75V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,062
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Product details
Overview
MIC5259-4.75BD5-TR from Micrel is a 300mA, 4.75V fixed-output CMOS low-dropout regulator optimized for ultra-low-noise RF power rails. It delivers 1.5% initial output accuracy, 300mV dropout at full load, and 30µV(rms) output noise with ceramic capacitor support - enabling clean supply in battery-powered handheld transceivers and precision analog subsystems.
For engineers reviewing the MIC5259-4.75BD5-TR datasheet, MIC5259-4.75BD5-TR pinout, MIC5259-4.75BD5-TR application, or MIC5259-4.75BD5-TR equivalent, key selection criteria include PSRR (70dB @ 1kHz), enable-input logic thresholds (VIH = 1.6V, VIL = 0.4V), thermal shutdown (150°C), and compatibility with 1µF ceramic input/output capacitors in space-constrained SOT-23-5 layouts.
Technical Context
The MIC5259-4.75BD5-TR integrates a CMOS pass element with active-clamp shutdown and a dedicated noise-bypass pin (BYP) tied to an internal reference. Its architecture enables fast transient response and stable regulation down to zero load without external compensation.
It operates across 2.7V–6.0V input while maintaining 4.75V output with ±1.5% initial tolerance and ±3.0% variation over –40°C to +125°C. The device uses TTL-compatible enable logic and achieves 70dB PSRR at 1kHz despite low quiescent current (105µA typical at light load).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 4.75V ±1.5% (initial), ±3.0% over temperature - ensures stable bias for RF front-end ICs requiring tight voltage margins. |
| Dropout Voltage | 300mV @ 300mA - allows operation from single-cell Li-ion (3.0V min) with 4.75V output when paired with boost stage or higher-input source. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from DC/DC converters feeding the LDO input, critical in mixed-signal SoC power domains. |
| Output Noise | 30µV(rms), 10Hz–100kHz - meets stringent spectral purity requirements for VCOs, PLLs, and low-phase-noise receivers. |
| Quiescent Current | 105µA @ light load; 0.2µA in shutdown - extends battery life in always-on sensor nodes and standby modes of portable radios. |
| Enable Thresholds | VIL = 0.4V max, VIH = 1.6V min - interfaces directly with 1.8V/3.3V GPIO without level-shifting in microcontroller-based power sequencing. |
| Thermal Shutdown | 150°C activation with 10°C hysteresis - protects against sustained overload in sealed enclosures without external thermal monitoring. |
Pinout & Package
Package: 5-pin Thin SOT-23-5 (D5), 2.9mm × 1.6mm footprint, 0.95mm height - compatible with automated pick-and-place and reflow assembly in high-density portable PCBs.
| 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 and noise rejection. |
| 2 (GND) | Ground Reference | Low-impedance return path for load, quiescent, and bypass currents; must be connected to solid 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 Terminal | Connects 0.01µF ceramic capacitor to GND to shunt reference noise; improves PSRR and reduces output RMS noise. |
| 5 (OUT) | Regulated Output | Delivers 4.75V ±1.5% to load; stable with ≥1µF ceramic output capacitor (X7R/X5R dielectric recommended). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-noise regulation | 30µV(rms) output noise with 0.01µF BYP capacitor - enables direct powering of RF synthesizers without additional filtering. |
| Active-clamp shutdown | Internal N-MOSFET discharges OUT pin during disable - prevents residual voltage hold-up on sensitive downstream circuitry. |
| Ceramic capacitor stability | Stable with 1µF X7R/X5R output cap (ESR ≤300mΩ) - eliminates need for bulk tantalum or electrolytic capacitors in compact designs. |
| Zero-off-mode current | 0.2µA shutdown current - supports multi-year battery life in IoT wake-on-radio applications using MIC5259-4.75BD5-TR as rail controller. |
| Fast transient response | Sub-10µs recovery from 50% load step - maintains regulation during burst-mode transmission in Bluetooth/Wi-Fi modules. |
Applications
| Cellular Transceiver Power | Portable Medical Sensor Bias |
|---|---|
Use Scenario: Powers RF transceiver ICs (e.g., Si4463, CC2652R) in battery-operated handheld radios and LPWAN gateways. IC Role / Device Role / Timing Role: Provides ultra-clean 4.75V supply to VCO and PA bias rails, minimizing phase noise and adjacent-channel interference. Use Value: 30µV(rms) noise and 70dB PSRR prevent reciprocal mixing and maintain EVM <3% under dynamic load conditions. | Use Scenario: Supplies precision analog front-end (AFE) and ADC reference in wearable ECG/SpO₂ monitors. IC Role / Device Role / Timing Role: Delivers low-drift, low-noise 4.75V reference for 24-bit delta-sigma ADCs and instrumentation amplifiers. Use Value: 1.5% initial accuracy and <3.0% tempco ensure <0.5% gain error across clinical operating range (0–45°C). |
| Industrial Handheld Scanner | Automotive Infotainment USB Hub |
Use Scenario: Powers laser diode driver and image sensor in rugged barcode scanners used in warehouse logistics. IC Role / Device Role / Timing Role: Regulates 4.75V rail for high-speed CMOS image sensor and timing-critical laser pulse control logic. Use Value: 300mV dropout enables operation from 5.0V USB-derived input even under cold-cranking dips to 4.7V. | Use Scenario: Supplies 4.75V auxiliary rail to USB 2.0 PHY and hub controller in automotive infotainment head units. IC Role / Device Role / Timing Role: Provides noise-isolated power for high-speed data interface, decoupled from noisy 5V DC/DC converter. Use Value: Active-clamp shutdown ensures rapid discharge of USB port capacitance during hot-plug detection and fault isolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79547DBVR | 4.7V output (not 4.75V); 25µV(rms) noise; 200mA rating; SOT-23-5 package | Lower output voltage margin may require system-level recalibration for 4.75V-dependent RF ICs | Select if 4.7V tolerance is acceptable and lower quiescent current (17µA) is prioritized over noise performance. |
| MCP1703T-4752E/MB | 4.75V output; 45µV(rms) noise; 250mA rating; SOT-23-5 package; no BYP pin | Lacks dedicated noise-bypass pin - requires larger output capacitance or external filtering for equivalent RF noise suppression | Select if board area permits added 10nF–100nF ceramic filter and 250mA load ceiling is sufficient. |
Compared with TPS79547DBVR and MCP1703T-4752E/MB, the MIC5259-4.75BD5-TR uniquely combines exact 4.75V output, lowest RMS noise (30µV), and integrated BYP pin for reference-noise cancellation - making it optimal for RF-sensitive applications where voltage precision and spectral purity are co-constrained.
Availability
MIC5259-4.75BD5-TR is available at Aetrix Electronics and suitable for cellular transceivers, portable medical sensors, industrial handheld scanners, and automotive infotainment USB hubs requiring stable component supply with guaranteed long-term sourcing.
Supply support for MIC5259-4.75BD5-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 specifically for ultra-low-noise, high-PSRR regulation in battery-powered RF and precision analog systems - emphasizing ceramic-capacitor compatibility, fast transient response, and zero-load stability.
FAQ
What is the minimum input voltage required for MIC5259-4.75BD5-TR to regulate at full 300mA load?
The MIC5259-4.75BD5-TR requires a minimum input voltage of 5.05V to maintain regulation at 300mA load, calculated as VOUT + dropout = 4.75V + 0.30V. Below this, output voltage drops below specification. Input must also remain within the absolute maximum 2.7V–6.0V operating range per datasheet Section 3.
Can MIC5259-4.75BD5-TR operate without the BYP capacitor?
Yes, MIC5259-4.75BD5-TR functions without the BYP capacitor, but output noise increases from 30µV(rms) to approximately 55µV(rms). The BYP pin may be left open per Pin Description table; however, omitting the 0.01µF capacitor degrades PSRR above 10kHz and compromises spectral purity in RF-sensitive applications.
Is MIC5259-4.75BD5-TR compatible with X5R ceramic output capacitors?
Yes, MIC5259-4.75BD5-TR is fully compatible with X5R ceramic output capacitors of ≥1.0µF value and ≤300mΩ ESR. X5R dielectrics provide adequate temperature stability (±15%) for most industrial and consumer applications, though X7R is preferred for extended temperature ranges due to tighter capacitance drift.
Does MIC5259-4.75BD5-TR require an input capacitor, and what type is recommended?
Yes, MIC5259-4.75BD5-TR requires a 1.0µF ceramic input capacitor (X7R or X5R) from IN to GND for stability and high-frequency noise suppression. Low-ESR ceramic types are mandatory; aluminum or tantalum capacitors are not recommended due to ESR and ESL limitations that risk oscillation.
What happens to the output when EN is pulled low on MIC5259-4.75BD5-TR?
When EN is pulled low (≤0.4V), MIC5259-4.75BD5-TR enters shutdown mode with near-zero quiescent current (0.2µA typical). Its internal active-clamp MOSFET discharges the OUT pin through GND, ensuring rapid and controlled de-energization of downstream loads - critical for safe power sequencing in multi-rail systems.
MIC5259-4.75BD5-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):
- 4.75V
- 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
MIC5259-4.75BD5-TR FAQ
1.How can I place an order for MIC5259-4.75BD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5259-4.75BD5-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 MIC5259-4.75BD5-TR reliable?
The price and inventory of MIC5259-4.75BD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5259-4.75BD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5259-4.75BD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5259-4.75BD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5259-4.75BD5-TR?
MIC5259-4.75BD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5259-4.75BD5-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 MIC5259-4.75BD5-TR?
For technical support, including MIC5259-4.75BD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5259-4.75BD5-TR requirements.
6.How does Aetrix verify that MIC5259-4.75BD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5259-4.75BD5-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 MIC5259-4.75BD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5259-4.75BD5-TR?
All MIC5259-4.75BD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5259-4.75BD5-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 MIC5259-4.75BD5-TR part is unused and in its original packaging.
Return procedure for MIC5259-4.75BD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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