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Microchip Technology MIC5259-2.5BD5-TR
- Part No.:
- MIC5259-2.5BD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5259-2.5BD5-TR.pdf
- Description:
- IC REG LIN 2.5V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,275
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Product details
Overview
MIC5259-2.5BD5-TR from Micrel is a 2.5V, 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 - enabling clean power delivery to sensitive analog and RF circuitry in compact portable devices.
For engineers reviewing the MIC5259-2.5BD5-TR datasheet, MIC5259-2.5BD5-TR pinout, MIC5259-2.5BD5-TR application, or MIC5259-2.5BD5-TR equivalent, key selection criteria include its 2.7–6.0V input range, TTL-compatible enable input, PSRR of 70dB @ 1kHz, ceramic-capacitor stability, and thermal shutdown protection in the 5-pin Thin SOT-23 package.
Technical Context
The MIC5259-2.5BD5-TR employs a CMOS pass element with active-clamp shutdown and internal reference bypassing via the BYP pin. Its architecture supports fast transient response and maintains regulation down to zero load while delivering high PSRR even at low VIN–VOUT differentials (e.g., 53dB @ 10kHz with only 0.3V headroom).
It integrates under-voltage lockout, current limiting (475mA typ), and thermal shutdown (150°C with 10°C hysteresis). The enable logic is TTL-compatible (VIH ≥ 1.6V, VIL ≤ 0.4V), and ground current remains stable at 105µA (typ) across light loads - critical for standby power budgeting in always-on subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.5V ±1.5% initial accuracy ensures precise biasing for ADC references and RF ICs without external feedback. |
| Max Output Current | 300mA continuous output supports core logic rails in microcontrollers and wireless transceivers. |
| Dropout Voltage | 300mV @ 300mA enables operation from single-cell Li-ion (3.0V min) or dual-cell alkaline (3.2V min) with margin. |
| Output Noise | 30µV(rms), 10Hz–100kHz, with 0.01µF BYP capacitor - meets stringent RF LNA and VCO supply requirements. |
| PSRR | 70dB @ 1kHz; 53dB @ 10kHz at 0.3V headroom - suppresses switching noise from DC/DC converters feeding the LDO input. |
| Quiescent Current | 105µA @ no load; <1µA in shutdown - extends battery life in sleep-mode IoT sensors and wearables. |
| Enable Threshold | TTL-compatible: VIH ≥ 1.6V, VIL ≤ 0.4V - interfaces directly with 1.8V/3.3V GPIO without level-shifting. |
Pinout & Package
Package: 5-pin Thin SOT-23 (D5), 2.9mm × 1.6mm × 1.0mm body height, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Supply Input | Accepts 2.7–6.0V input; requires 1.0µF 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 before OUT. |
| 3 - EN | Enable/Shutdown Input | Active-high TTL input; drives regulator ON/OFF; floating state prohibited - tie to IN or logic rail. |
| 4 - BYP | Noise Bypass Terminal | Connects to 0.01µF capacitor to GND to reduce reference noise and improve PSRR by >10dB. |
| 5 - OUT | Regulated Output | Delivers 2.5V ±1.5% to load; requires ≥1.0µF ceramic output capacitor (X7R/X5R, ESR ≤300mΩ). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Noise Regulation | 30µV(rms) output noise with 0.01µF BYP cap enables direct powering of VCOs and RF front-ends without additional filtering. |
| Active Shutdown Clamp | Internal N-MOSFET discharges OUT capacitor when disabled - prevents back-powering and ensures safe load de-energization. |
| Ceramic Capacitor Stability | Stable with 1.0µF X7R/X5R ceramic caps (ESR ≤300mΩ); eliminates need for larger, less reliable tantalum or electrolytic types. |
| Zero-Load Regulation | Maintains 2.5V output with no load - supports CMOS RAM keep-alive and real-time clock backup circuits without dummy loads. |
| High PSRR at Low Headroom | 53dB PSRR at 10kHz with only 0.3V VIN–VOUT differential - preserves signal integrity when fed from tightly regulated intermediate rails. |
Applications
| Cellular Transceiver Power | Portable Medical Sensor |
|---|---|
|
Use Scenario: Powers RF transceiver ICs (e.g., Bluetooth/Wi-Fi SoCs) in smartphones and wearables where supply noise directly impacts EVM and sensitivity. IC Role / Device Role / Timing Role: Primary low-noise voltage source for VCO, LNA, and mixer bias rails. Use Value: 30µV(rms) noise and 70dB PSRR prevent phase noise degradation and adjacent-channel interference in 2.4GHz ISM band operation. |
Use Scenario: Supplies analog front-end (AFE) and low-power MCU in handheld ECG or pulse oximeter devices running on coin-cell or LiPo batteries. IC Role / Device Role / Timing Role: Stable 2.5V reference rail for precision ADCs and sensor excitation circuits. Use Value: 1.5% initial accuracy and zero-load regulation ensure consistent measurement offset and gain calibration over battery discharge. |
| Laptop Subsystem Rail | Industrial Handheld Terminal |
|
Use Scenario: Generates clean 2.5V for PCIe SerDes reference clocks and USB PHYs in ultrabooks and 2-in-1 tablets. IC Role / Device Role / Timing Role: Dedicated low-noise auxiliary LDO for timing-critical interface circuitry. Use Value: Fast transient response and 300mV dropout allow direct regulation from 3.3V main rail, minimizing heat and PCB area. |
Use Scenario: Powers barcode scanner engine, display driver, and secure element in ruggedized warehouse scanners operating across –20°C to +70°C. IC Role / Device Role / Timing Role: Main system rail for mixed-signal SoC with integrated radio and touch controller. Use Value: –40°C to +125°C junction rating and 3.0% total accuracy over temperature ensure reliable boot and operation in variable ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS7A2025PDQNR | 2.5V, 300mA, 16µV(rms) noise, but requires 0.7V minimum headroom and lacks BYP pin. | Better noise performance, but no adjustable bypass; less effective for ultra-low-noise RF designs requiring external reference filtering. | Prefer when lowest possible noise is primary and board space allows larger input capacitor; avoid when BYP-controlled PSRR tailoring is needed. |
| MCP1700T-2502E/MB | 2.5V, 250mA, 17µV(rms), no enable pin, SOT-23-3 package. | Lower cost and smaller footprint, but no shutdown control or active discharge - unsuitable for power-gated subsystems. | Select for always-on, space-constrained applications like sensor nodes; reject when dynamic power management or fast turn-off is required. |
Compared with TPS7A2025PDQNR and MCP1700T-2502E/MB, the MIC5259-2.5BD5-TR uniquely combines a dedicated noise-bypass pin, active shutdown clamp, and TTL-enable in a 5-pin SOT-23 - enabling both ultra-low-noise operation and precise power sequencing in battery-constrained RF systems.
Availability
MIC5259-2.5BD5-TR is available at Aetrix Electronics and suitable for cellular transceivers, portable medical sensors, laptop subsystems, and industrial handheld terminals requiring stable component supply with guaranteed long-term traceability.
Supply support for MIC5259-2.5BD5-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 founded in 1978 and acquired by Microchip Technology in 2015. Known for high-performance power management and timing solutions.
The MIC5259 series was designed specifically for ultra-low-noise, high-PSRR regulation in battery-powered RF and portable computing applications - emphasizing ceramic-capacitor compatibility, fast transient response, and minimal quiescent current.
FAQ
What is the maximum input voltage for MIC5259-2.5BD5-TR?
The absolute maximum input voltage for MIC5259-2.5BD5-TR is +7V, but the recommended operating range is +2.7V to +6.0V. Exceeding 6.0V risks violating the device's safe operating area, especially under high load or elevated ambient temperatures. Always observe the thermal derating curve in the datasheet when operating near maximum ratings.
Does MIC5259-2.5BD5-TR require an external bypass capacitor on the BYP pin?
While MIC5259-2.5BD5-TR functions without the BYP capacitor, a 0.01µF ceramic capacitor between BYP and GND is required to achieve the specified 30µV(rms) output noise and optimal PSRR. Omitting it increases noise by ~2–3× and reduces high-frequency ripple rejection - critical for RF-sensitive applications.
Can MIC5259-2.5BD5-TR operate with zero load current?
Yes, MIC5259-2.5BD5-TR maintains regulation and stability with no load - a key feature confirmed in the datasheet's "No-Load Stability" section. This makes MIC5259-2.5BD5-TR suitable for applications such as RTC backup rails and CMOS RAM keep-alive circuits where load current drops to near-zero during sleep modes.
What is the thermal resistance (θJA) of MIC5259-2.5BD5-TR in its SOT-23-5 package?
The junction-to-ambient thermal resistance (θJA) for MIC5259-2.5BD5-TR in the 5-pin Thin SOT-23 package is 235°C/W on a standard PCB footprint. With a maximum junction temperature of +125°C, this limits usable power dissipation to ~235mW at +70°C ambient - requiring careful VIN–VOUT margin selection at full 300mA load.
Is MIC5259-2.5BD5-TR pin-compatible with other MIC5259 variants in the same package?
Yes, all MIC5259-x.xBD5 variants share identical pinout, package dimensions, and electrical interface in the Thin SOT-23-5 package. Only the fixed output voltage differs - allowing drop-in replacement across 1.5V to 3.3V versions without layout changes, provided the system's voltage tolerance and load requirements are met.
MIC5259-2.5BD5-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):
- 2.5V
- 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
MIC5259-2.5BD5-TR FAQ
1.How can I place an order for MIC5259-2.5BD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5259-2.5BD5-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 MIC5259-2.5BD5-TR reliable?
The price and inventory of MIC5259-2.5BD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5259-2.5BD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5259-2.5BD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5259-2.5BD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5259-2.5BD5-TR?
MIC5259-2.5BD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5259-2.5BD5-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 MIC5259-2.5BD5-TR?
For technical support, including MIC5259-2.5BD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5259-2.5BD5-TR requirements.
6.How does Aetrix verify that MIC5259-2.5BD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5259-2.5BD5-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 MIC5259-2.5BD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5259-2.5BD5-TR?
All MIC5259-2.5BD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5259-2.5BD5-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 MIC5259-2.5BD5-TR part is unused and in its original packaging.
Return procedure for MIC5259-2.5BD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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