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Microchip Technology MIC5259-2.8BML-TR
- Part No.:
- MIC5259-2.8BML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 6-VDFN Exposed Pad, 6-MLF®
- Datasheet:
-
MIC5259-2.8BML-TR.pdf
- Description:
- IC REG LINEAR 2.8V 300MA 6MLF
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MIC5259-2.8BML-TR from Micrel is a 2.8V, 300mA CMOS low-dropout linear regulator in a 6-pin 2mm × 2mm MLF® package, 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 0.01µF bypass capacitor-enabling clean supply for GSM/UMTS transceivers and PLLs in portable wireless devices.
For engineers reviewing the MIC5259-2.8BML-TR datasheet, MIC5259-2.8BML-TR pinout, MIC5259-2.8BML-TR application, or MIC5259-2.8BML-TR equivalent, this page provides verified electrical parameters, thermal resistance (θJA = 90°C/W), enable logic thresholds (VIH = 1.6V, VIL = 0.4V), PSRR performance (70dB @ 1kHz), and ceramic-capacitor stability-critical for battery-powered handheld design validation.
Technical Context
The MIC5259-2.8BML-TR integrates a precision bandgap reference, fast-error amplifier, and active shutdown clamp to achieve tight line/load regulation (<0.3%/V, <3.0%) and rapid transient response. Its internal quick-start circuit enables stable turn-on even with 0.01–1.0µF bypass capacitance on the BYP pin.
This LDO uses CMOS pass transistor architecture with TTL-compatible enable input and zero off-mode current (≤1µA). It operates across 2.7–6.0V input range and maintains regulation down to no-load conditions-essential for CMOS RAM keep-alive and intermittent-power systems.
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 voltage for 2.8V I/O interfaces and baseband processors. |
| Dropout Voltage | 300mV @ 300mA-supports operation from single-cell Li-ion (3.0V min) while delivering full rated current. |
| PSRR | 70dB @ 1kHz-rejects switching noise from DC-DC converters feeding the LDO input, critical in mixed-signal SoC designs. |
| Output Noise | 30µV(rms), 10Hz–100kHz with 0.01µF BYP capacitor-meets stringent RF supply cleanliness requirements for cellular front-end ICs. |
| Quiescent Current | 105µA @ light load; ≤1µA in shutdown-extends battery life in always-on sensor nodes and standby modes. |
| Enable Thresholds | VIH = 1.6V, VIL = 0.4V-directly compatible with 1.8V/2.5V/3.3V GPIO without level-shifting. |
| Thermal Resistance | θJA = 90°C/W (MLF® package)-enables 300mA continuous output at ambient up to 70°C with minimal PCB copper area. |
Pinout & Package
Package: 6-pin 2mm × 2mm MLF® (exposed thermal pad), RoHS-compliant, Pb-free. Pin 5 is NC (no connect); pin 6 is BYP (bypass capacitor terminal).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN) | Enable/Shutdown Input | CMOS-compatible active-high control; must be pulled high (>1.6V) to enable regulator; floating prohibited. |
| 2 (GND) | Ground Reference | Primary return path for load, quiescent, and bypass currents; connects to exposed thermal pad for heat dissipation. |
| 3 (IN) | Input Supply | Accepts 2.7–6.0V; requires ≥1µF ceramic input capacitor close to pin for high-frequency stability. |
| 4 (OUT) | Regulated Output | Delivers 2.8V ±1.5%; requires ≥1µF low-ESR ceramic capacitor; supports no-load regulation. |
| 5 (NC) | No Connect | Unbonded die pad; must remain unconnected and unpopulated on PCB. |
| 6 (BYP) | Noise Bypass Terminal | Connects to 0.01–1.0µF capacitor to GND to reduce reference noise; directly lowers output RMS noise to 30µV. |
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 synthesizers without additional filtering. |
| Active shutdown clamp | Internal N-MOSFET discharges OUT capacitor when EN = low-prevents back-powering of downstream circuitry during sleep mode. |
| Ceramic capacitor stability | Stable with 1µF X7R/X5R ceramic output cap (ESR ≤ 300mΩ)-eliminates need for bulky tantalum or electrolytic capacitors in space-constrained layouts. |
| Tight load regulation | ≤3.0% variation from 0.1mA to 300mA load-maintains voltage integrity across dynamic processor load states (e.g., burst transmission). |
| Zero off-mode current | ≤1µA shutdown current-reduces battery drain to negligible levels during extended idle periods in IoT edge sensors. |
Applications
| Cellular Transceiver Power | GSM/UMTS Baseband Core |
|---|---|
|
Use Scenario: Clean 2.8V supply for RF power amplifier bias and mixer stages in quad-band GSM handsets. IC Role / Device Role / Timing Role: Ultra-low-noise LDO providing isolated analog rail decoupled from noisy digital DC-DC converter outputs. Use Value: 30µV(rms) noise and 70dB PSRR prevent reciprocal mixing and phase noise degradation in transmit chain. |
Use Scenario: Stable 2.8V core voltage for baseband ASICs with embedded ARM9 and DSP subsystems. IC Role / Device Role / Timing Role: Primary low-dropout regulator enabling operation from partially discharged Li-ion cells (≥3.0V). Use Value: 300mV dropout ensures >2.8V output at 300mA even at end-of-discharge, preventing brownout resets. |
| Bluetooth/Wi-Fi Coexistence Module | Portable Medical Sensor Hub |
|
Use Scenario: Dedicated low-noise rail for Bluetooth radio coexisting with Wi-Fi and GPS in compact wearables. IC Role / Device Role / Timing Role: Independent LDO isolating Bluetooth RF section from shared system power bus. Use Value: Active shutdown (EN-controlled) eliminates cross-talk during Bluetooth sleep cycles, reducing system-wide EMI. |
Use Scenario: Powering low-power ADCs, op-amps, and BLE SoCs in battery-operated ECG/SpO₂ monitors. IC Role / Device Role / Timing Role: Always-on LDO maintaining 2.8V for sensor signal chain during microcontroller deep-sleep. Use Value: No-load stability and 105µA quiescent current extend single-CR2032 battery life beyond 12 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79528DBVR | 2.8V fixed, 250mA, 17µV(rms) noise, 65dB PSRR @ 1kHz, SOT-23-5 package | Limited to 250mA; lower noise but reduced current drive; no BYP pin for external noise tuning | Select when ultra-low noise dominates over current capability and board space permits SOT-23-5 footprint. |
| NCP1117ST28T3G | 2.8V fixed, 800mA, 45µV(rms) noise, 60dB PSRR @ 120Hz, SOT-223 package | Higher dropout (1.2V @ 800mA); higher noise; lacks enable/shutdown and BYP functionality | Select only for cost-sensitive, non-RF applications where thermal mass and PCB area allow larger SOT-223 layout. |
Compared with TPS79528DBVR and NCP1117ST28T3G, the MIC5259-2.8BML-TR uniquely balances 300mA current, 30µV(rms) noise, 70dB PSRR, and BYP-adjustable filtering in a 2mm × 2mm footprint-making it optimal for RF-critical, space-constrained portable designs requiring both performance and configurability.
Availability
MIC5259-2.8BML-TR is available at Aetrix Electronics and suitable for cellular transceivers, portable medical sensors, Bluetooth coexistence modules, and handheld computing devices requiring stable component supply with guaranteed long-term lifecycle support.
Supply support for MIC5259-2.8BML-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 MIC5259-2.8BML-TR belongs to Micrel's µCap CMOS LDO family, engineered specifically for battery-powered RF systems demanding ultra-low noise, fast transient response, and minimal board area-targeting cellular, portable, and wireless infrastructure markets.
FAQ
What is the maximum input voltage for MIC5259-2.8BML-TR?
The absolute maximum input voltage for MIC5259-2.8BML-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 temperature. For a 2.8V output at 200mA in the MLF® package, the calculated max input is 5.85V at 70°C ambient-based on θJA = 90°C/W and TJ(max) = 125°C. Always verify thermal margin using PD = (VIN – 2.8V) × IOUT + VIN × IGND.
Does MIC5259-2.8BML-TR require an external bypass capacitor?
Yes, MIC5259-2.8BML-TR requires a capacitor from the BYP pin (pin 6) to GND to achieve its specified 30µV(rms) output noise. A 0.01µF ceramic capacitor is recommended; values up to 1.0µF further reduce noise and improve PSRR but slightly increase turn-on time. The internal quick-start circuit minimizes this delay. Leaving BYP open degrades noise performance to ~100µV(rms) or higher.
Can MIC5259-2.8BML-TR operate with no load?
Yes, MIC5259-2.8BML-TR remains stable and in regulation with zero load current-a key differentiator from many LDOs. This feature is essential for applications like CMOS RAM keep-alive circuits, real-time clocks, or sensor biasing where the output may be disconnected or draw negligible current for extended periods without risking oscillation or dropout.
What is the thermal shutdown behavior of MIC5259-2.8BML-TR?
MIC5259-2.8BML-TR activates thermal shutdown at TJ = 150°C with 10°C hysteresis, meaning it resumes regulation only after junction temperature falls below 140°C. During shutdown, the output is disabled and ground current drops to ≤1µA. The MLF® package's θJA = 90°C/W allows sustained 300mA output at ambient ≤70°C with standard PCB copper; derate linearly above that.
Is MIC5259-2.8BML-TR pin-compatible with other MIC5259 variants?
Yes, all MIC5259-x.xBML variants-including MIC5259-2.8BML-TR-share identical 6-pin 2mm × 2mm MLF® pinout and footprint. Output voltage is laser-trimmed during manufacturing; no external components change the fixed 2.8V setting. This allows voltage-scaling flexibility within the same PCB layout when migrating between 2.5V, 2.8V, 3.0V, or 3.3V versions.
MIC5259-2.8BML-TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 6-VDFN Exposed Pad, 6-MLF®
- 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:
- 6-DFN (2x2)
MIC5259-2.8BML-TR FAQ
1.How can I place an order for MIC5259-2.8BML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5259-2.8BML-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 MIC5259-2.8BML-TR reliable?
The price and inventory of MIC5259-2.8BML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5259-2.8BML-TR is usually 5 days.
3.What payment methods are accepted for MIC5259-2.8BML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5259-2.8BML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5259-2.8BML-TR?
MIC5259-2.8BML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5259-2.8BML-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 MIC5259-2.8BML-TR?
For technical support, including MIC5259-2.8BML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5259-2.8BML-TR requirements.
6.How does Aetrix verify that MIC5259-2.8BML-TR is sourced from the original manufacturer or authorized distributors?
All MIC5259-2.8BML-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 MIC5259-2.8BML-TR meets industry standards.
7.What is the process for return or replacement of MIC5259-2.8BML-TR?
All MIC5259-2.8BML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5259-2.8BML-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 MIC5259-2.8BML-TR part is unused and in its original packaging.
Return procedure for MIC5259-2.8BML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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