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Microchip Technology MIC5259-2.8BD5-TR
- Part No.:
- MIC5259-2.8BD5-TR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MIC5259-2.8BD5-TR.pdf
- Description:
- IC REG LIN 2.8V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,246
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Product details
Overview
MIC5259-2.8BD5-TR from Micrel is a 2.8V, 300mA CMOS low-dropout linear regulator optimized for ultra-low-noise RF power supply applications. It delivers 1.5% initial output accuracy, 300mV dropout at full load, and 30µV(rms) output noise with ceramic capacitor support - enabling clean biasing of sensitive analog/RF circuitry in space-constrained portable devices.
For engineers reviewing the MIC5259-2.8BD5-TR datasheet, MIC5259-2.8BD5-TR pinout, MIC5259-2.8BD5-TR application, or MIC5259-2.8BD5-TR equivalent, key selection criteria include PSRR performance at low VIN (70dB @ 1kHz), TTL-compatible enable control, thermal shutdown behavior, and stability with 1µF ceramic output capacitors - all critical for battery-powered wireless subsystems.
Technical Context
The MIC5259-2.8BD5-TR employs a CMOS pass element with active-clamp shutdown and internal reference bypass architecture. Its functional diagram confirms dedicated BYP pin for external 0.01µF capacitor connection to reduce reference noise - directly lowering output voltage noise to 30µV(rms) over 10Hz–100kHz.
It operates across 2.7V–6.0V input range with logic-level enable (VIH ≥ 1.6V, VIL ≤ 0.4V), supports no-load regulation, and integrates current limit (475mA typ.) and thermal shutdown (150°C trip, 10°C hysteresis) - making it suitable for handheld systems requiring fast transient response and zero-off-mode current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.8V ±1.5% (initial), ±3.0% over –40°C to +125°C - ensures stable core/bias rail for RF ICs without external feedback. |
| Max Output Current | 300mA continuous - sufficient for powering baseband processors, RF transceivers, or sensor signal chains in compact designs. |
| Dropout Voltage | 300mV at 300mA - enables operation from single-cell Li-ion (3.0V min.) while maintaining regulation down to 2.8V output. |
| PSRR | 70dB @ 1kHz - suppresses switching noise from PMICs or DC-DC converters feeding the LDO input. |
| Output Noise | 30µV(rms), 10Hz–100kHz with 0.01µF BYP capacitor - meets stringent noise requirements for VCOs, LNAs, and ADC references. |
| Quiescent Current | 105µA at light load; <1µA in shutdown - extends battery life in always-on monitoring or sleep-mode circuits. |
| Enable Logic | TTL-compatible (VIH ≥ 1.6V, VIL ≤ 0.4V); active-high EN pin - allows direct interfacing with microcontroller GPIOs without level-shifting. |
Pinout & Package
Package: 5-Pin Thin SOT-23-5 (D5), 2.9mm × 1.6mm footprint, 1.1mm max height - optimized for high-density PCB layouts in portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Supply Input | Accepts 2.7V–6.0V input; requires 1µF ceramic bypass to GND for stability and noise suppression. |
| 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 | CMOS-compatible active-high control; drives output ON when ≥1.6V, OFF when ≤0.4V; must not float. |
| 4 - BYP | Reference Bypass | Connects external 0.01µF capacitor to GND to reduce internal reference noise - directly lowers output voltage noise. |
| 5 - OUT | Regulated Output | Delivers stable 2.8V; requires ≥1µF ceramic output capacitor (X7R/X5R dielectric) for stability and transient response. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Output Noise | 30µV(rms) with 0.01µF BYP capacitor - enables use in RF front-end bias rails where phase noise and SNR are critical. |
| Active Shutdown Clamp | Internal N-MOSFET discharges output capacitor on disable - prevents residual voltage hold-up on downstream circuitry. |
| Ceramic Capacitor Stability | Stable with ≥1µF X7R/X5R ceramic output cap (ESR ≤300mΩ) - eliminates need for larger, less reliable tantalum or electrolytic caps. |
| No-Load Regulation | Maintains regulation with zero output current - supports CMOS RAM keep-alive and always-on sensor monitoring without load resistors. |
| High PSRR at Low VIN | 70dB @ 1kHz even when VIN = VOUT + 0.3V - preserves noise rejection during battery discharge when headroom shrinks. |
Applications
| Cellular Transceiver Bias | Bluetooth/Wi-Fi SoC Core Rail |
|---|---|
|
Use Scenario: Powering RF transceiver VCO, LNA, and mixer stages in GSM/UMTS modules. IC Role / Device Role / Timing Role: Ultra-low-noise 2.8V bias source ensuring minimal phase noise degradation and receiver sensitivity loss. Use Value: 30µV(rms) noise and 70dB PSRR prevent coupling of digital switching noise into RF signal paths. |
Use Scenario: Supplying core voltage to Bluetooth 5.0 or Wi-Fi 4/5 SoCs in wearables and IoT edge nodes. IC Role / Device Role / Timing Role: Primary 2.8V LDO delivering regulated power with fast load transient response during burst transmission. Use Value: 300mV dropout and 105µA quiescent current extend runtime while supporting dynamic voltage scaling. |
| Laptop Subsystem Sensor Rail | Industrial Handheld Data Acquisition |
|
Use Scenario: Providing clean 2.8V supply to MEMS accelerometers, gyroscopes, and environmental sensors. IC Role / Device Role / Timing Role: Low-noise, no-load-stable regulator isolating analog sensor front-ends from noisy system rails. Use Value: No-load regulation and 1.5% accuracy ensure consistent sensor offset and gain calibration across operating conditions. |
Use Scenario: Powering precision ADCs, op-amps, and isolated communication interfaces in portable test equipment. IC Role / Device Role / Timing Role: High-accuracy, thermally robust LDO supplying reference-sensitive analog signal chains. Use Value: ±3.0% accuracy over –40°C to +125°C and thermal shutdown protect measurement integrity in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1703T-2802E/MB | 2.8V fixed, 250mA, 115µA IQ, 350mV dropout @ 250mA, 40µV(rms) noise - lower current rating and higher dropout than MIC5259-2.8BD5-TR. | Less suitable for 300mA RF loads; better fit for lower-power MCU peripherals where noise is secondary. | Select if board space allows SOT-23-5 and load current stays ≤250mA; verify PSRR (60dB @ 1kHz) meets system noise floor. |
| TLS850F2BTV50 | 2.8V fixed, 500mA, 35µA IQ, 400mV dropout @ 500mA, 42µV(rms) noise - automotive-grade AEC-Q100 qualified, higher IQ efficiency but higher noise. | Targeted for automotive infotainment and ADAS; over-specified for consumer portables due to qualification overhead and cost. | Choose only for automotive programs requiring AEC-Q100; avoid for cost-sensitive consumer designs where MIC5259-2.8BD5-TR's RF-optimized noise performance is primary. |
Compared with MCP1703T-2802E/MB and TLS850F2BTV50, the MIC5259-2.8BD5-TR uniquely balances 300mA capability, 30µV(rms) noise, and 70dB PSRR in a standard SOT-23-5 package - making it the preferred choice for RF-sensitive portable applications where noise and dropout are co-critical.
Availability
MIC5259-2.8BD5-TR is available at Aetrix Electronics and suitable for cellular transceiver bias, Bluetooth/Wi-Fi SoC core rails, and industrial handheld data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MIC5259-2.8BD5-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. Known for high-performance LDOs and Ethernet PHYs.
The MIC5259 family was designed specifically for ultra-low-noise, high-PSRR power regulation in battery-powered RF and portable electronics - emphasizing ceramic capacitor compatibility, fast transient response, and zero-off-mode current.
FAQ
What is the maximum input voltage for MIC5259-2.8BD5-TR?
The absolute maximum input voltage for MIC5259-2.8BD5-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 load. For optimal PSRR and thermal performance at 300mA, VIN should remain ≤5.85V when ambient temperature reaches 70°C in a minimum-footprint layout.
Does MIC5259-2.8BD5-TR require an external bypass capacitor on the BYP pin?
Yes - MIC5259-2.8BD5-TR requires a 0.01µF capacitor connected between the BYP pin and GND to achieve its specified 30µV(rms) output noise. Leaving BYP open increases noise significantly; using >0.01µF further reduces noise but slightly increases turn-on time. The quick-start circuit minimizes this delay, preserving system startup responsiveness.
Can MIC5259-2.8BD5-TR operate without a load?
Yes - MIC5259-2.8BD5-TR maintains regulation with zero output current, a feature confirmed in its application notes. This no-load stability eliminates the need for bleed resistors and supports applications like CMOS RAM keep-alive circuits, real-time clock backup, or always-on sensor monitoring where intermittent load demand occurs.
What ceramic capacitor dielectric is recommended for MIC5259-2.8BD5-TR's output?
X7R or X5R dielectric ceramic capacitors are recommended for MIC5259-2.8BD5-TR's output. These offer ±15% capacitance variation over –55°C to +125°C, ensuring stable regulation across temperature. Y5V or Z5U types are discouraged due to >50% capacitance loss over temperature, risking instability or poor transient response.
Is MIC5259-2.8BD5-TR pin-compatible with other MIC5259 variants in the same package?
Yes - all MIC5259-x.xBD5 variants share identical 5-pin Thin SOT-23-5 pinout and footprint. The MIC5259-2.8BD5-TR can be substituted for other BD5 versions (e.g., MIC5259-3.3BD5-TR) without PCB changes, provided system voltage requirements align and BYP capacitor value is verified for target noise performance.
MIC5259-2.8BD5-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):
- 2.8V
- 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
MIC5259-2.8BD5-TR FAQ
1.How can I place an order for MIC5259-2.8BD5-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5259-2.8BD5-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 MIC5259-2.8BD5-TR reliable?
The price and inventory of MIC5259-2.8BD5-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5259-2.8BD5-TR is usually 5 days.
3.What payment methods are accepted for MIC5259-2.8BD5-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5259-2.8BD5-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5259-2.8BD5-TR?
MIC5259-2.8BD5-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5259-2.8BD5-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 MIC5259-2.8BD5-TR?
For technical support, including MIC5259-2.8BD5-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5259-2.8BD5-TR requirements.
6.How does Aetrix verify that MIC5259-2.8BD5-TR is sourced from the original manufacturer or authorized distributors?
All MIC5259-2.8BD5-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 MIC5259-2.8BD5-TR meets industry standards.
7.What is the process for return or replacement of MIC5259-2.8BD5-TR?
All MIC5259-2.8BD5-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5259-2.8BD5-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 MIC5259-2.8BD5-TR part is unused and in its original packaging.
Return procedure for MIC5259-2.8BD5-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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