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Microchip Technology MIC5259-1.8BML-TR
- Part No.:
- MIC5259-1.8BML-TR
- Manufacturer:
- Microchip Technology
- Package:
- 6-VDFN Exposed Pad, 6-MLF®
- Datasheet:
-
MIC5259-1.8BML-TR.pdf
- Description:
- IC REG LINEAR 1.8V 300MA 6MLF
- Quantity:
- Payment:
- Shipping:
Inventory:3,379
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Product details
Overview
MIC5259-1.8BML-TR from Micrel is a 1.8V fixed-output, 300mA CMOS low-dropout regulator optimized for RF and battery-powered systems. It delivers 1.5% initial output accuracy, 300mV dropout at full load, 30µV(rms) output noise, and 70dB PSRR at 1kHz - enabling clean power delivery in sensitive analog and wireless circuits.
For engineers reviewing the MIC5259-1.8BML-TR datasheet, MIC5259-1.8BML-TR pinout, MIC5259-1.8BML-TR application, or MIC5259-1.8BML-TR equivalent, key selection criteria include ultra-low noise performance, ceramic-capacitor stability, TTL-compatible enable control, and thermal shutdown protection in the compact 2mm × 2mm MLF® package.
Technical Context
The MIC5259-1.8BML-TR employs a CMOS pass element with active-clamp shutdown and internal reference bypassing via dedicated BYP pin. Its architecture supports fast transient response and maintains regulation down to zero load while rejecting ripple across 10Hz–10kHz.
It operates from 2.7V to 6.0V input, delivers 1.8V ±1.5% over initial conditions, and achieves 3.0% total accuracy over –40°C to +125°C. The device integrates thermal shutdown (150°C trip, 10°C hysteresis) and current limit (~400mA typical), with ground current rising only from 105µA (light load) to 250µA (300mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1.5% initial accuracy; ensures stable core voltage for 1.8V logic and RF ICs without external feedback. |
| Dropout Voltage | 300mV at 300mA; enables operation from 2.1V input, critical for single-cell Li-ion or Li-poly systems. |
| Output Noise | 30µV(rms), 10Hz–100kHz; minimizes phase noise in VCOs and ADC references when used with 0.01µF BYP capacitor. |
| PSRR | 70dB at 1kHz; suppresses switching noise from DC/DC converters feeding the LDO input. |
| Quiescent Current | 105µA at light load; extends battery life in always-on sensor or standby circuits. |
| Enable Threshold | VIH = 1.6V, VIL = 0.4V; compatible with 1.8V/3.3V GPIO without level-shifting. |
| Thermal Shutdown | 150°C with 10°C hysteresis; protects against sustained overload in sealed portable enclosures. |
Pinout & Package
Package: 6-pin 2mm × 2mm MLF® (MicroLeadFrame), exposed thermal pad, RoHS-compliant, moisture-sensitive level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN | Enable/Shutdown input | CMOS-compatible active-high control; must be pulled high (>1.6V) to enable output; floating prohibited. |
| 2 - GND | Ground reference | Primary return path for load, quiescent, and bypass currents; connects to thermal pad for heat dissipation. |
| 3 - IN | Input supply | Accepts 2.7V–6.0V; requires 1µF ceramic bypass to GND close to pin for stability and EMI suppression. |
| 4 - OUT | Regulated output | Delivers 1.8V up to 300mA; requires ≥1µF ceramic output capacitor (X7R/X5R) for loop stability. |
| 5 - NC | No connect | Internally unconnected; no electrical function; must remain unconnected on PCB. |
| 6 - BYP | Reference bypass | Connects 0.01µF–1.0µF capacitor to GND to reduce output noise and improve PSRR at high frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low noise output | 30µV(rms) with 0.01µF BYP capacitor enables use in GPS receivers and LTE front-end bias rails. |
| Ceramic capacitor stability | Stable with ≥1µF X7R/X5R output caps (ESR ≤300mΩ); eliminates need for bulky tantalum or electrolytic capacitors. |
| Active shutdown clamp | Internal N-MOSFET discharges OUT pin during disable, preventing back-powering of downstream circuitry. |
| TTL-compatible enable | VIH = 1.6V min allows direct interfacing with 1.8V FPGA I/O or microcontroller GPIO without external pull-ups. |
| Zero-load regulation | Maintains 1.8V output with 0mA load - essential for maintaining SRAM retention or real-time clock backup power. |
Applications
| Cellular Front-End Power | Portable Medical Sensors |
|---|---|
|
Use Scenario: Powering RF transceiver VCOs and LNA bias rails in 4G/5G handsets where supply noise directly impacts EVM and adjacent channel leakage. IC Role / Device Role / Timing Role: Ultra-low-noise 1.8V local regulator providing clean analog supply independent of noisy system DC/DC rails. Use Value: 30µV(rms) noise and 70dB PSRR prevent degradation of receiver sensitivity and transmit spectral purity. |
Use Scenario: Supplying precision analog front-ends (AFE) in wearable ECG or pulse oximetry sensors operating from coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent, zero-load-stable LDO delivering regulated 1.8V to ADC reference and op-amp stages. Use Value: 105µA IQ and 300mV dropout extend battery runtime while maintaining signal integrity across temperature. |
| Laptop Subsystem Bias | Industrial Handheld Scanners |
|
Use Scenario: Generating 1.8V supply for PCIe Gen3 SerDes reference clocks and SSD controller I/O banks in ultrabooks. IC Role / Device Role / Timing Role: High-PSRR local regulator decoupling high-speed digital noise from timing-critical analog clock domains. Use Value: 70dB PSRR at 1kHz suppresses switching artifacts from CPU VRMs that could induce jitter in clock recovery circuits. |
Use Scenario: Powering barcode image sensors and laser drivers in ruggedized handheld scanners used in warehouse logistics. IC Role / Device Role / Timing Role: Robust 1.8V regulator with thermal shutdown and current limit protecting against motor-induced supply transients. Use Value: 150°C thermal shutdown and 400mA current limit prevent latch-up during ESD events or cable short-circuits in field use. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B182MR-G | 1.8V, 300mA, 45µV(rms) noise, 65dB PSRR @ 1kHz, SOT-25 package (5-pin) | Lacks dedicated BYP pin; uses internal compensation; lower PSRR limits RF filtering capability | Prefer when board space is constrained and noise <50µV(rms) suffices; not suitable for VCO biasing. |
| Analog Devices ADP160ACBZ-1.8-R7 | 1.8V, 150mA, 25µV(rms), 75dB PSRR @ 1kHz, 5-pin TSOT-23 | Lower current rating (150mA vs. 300mA); higher cost; superior PSRR but insufficient for high-current RF loads | Select only if load current ≤150mA and maximum PSRR is prioritized over output current capability. |
Compared with XC6219B182MR-G and ADP160ACBZ-1.8-R7, the MIC5259-1.8BML-TR uniquely balances 300mA output, 30µV(rms) noise, and a dedicated BYP pin for tunable noise reduction - making it optimal for RF power management where both current and spectral purity are critical.
Availability
MIC5259-1.8BML-TR is available at Aetrix Electronics and suitable for cellular front-end power, portable medical sensors, laptop subsystem bias, and industrial handheld scanners requiring stable component supply across automotive-grade temperature range (–40°C to +125°C).
Supply support for MIC5259-1.8BML-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 family was designed specifically for ultra-low-noise, high-PSRR power delivery in battery-operated RF and portable computing systems - emphasizing ceramic-capacitor compatibility and fast transient response.
FAQ
What is the minimum input voltage required for MIC5259-1.8BML-TR to regulate at full 300mA load?
The MIC5259-1.8BML-TR requires a minimum input voltage of 2.1V to maintain regulation at 300mA, based on its 300mV dropout specification. Below 2.1V, output voltage drops below 1.8V; operation below 2.7V input is not guaranteed per absolute ratings, though functional margin exists down to 2.1V under controlled conditions.
Can MIC5259-1.8BML-TR operate without an output capacitor?
No - MIC5259-1.8BML-TR requires a minimum 1µF ceramic output capacitor (X7R/X5R dielectric) for stability. Omitting it risks high-frequency oscillation due to loop instability. Unlike some LDOs, it does not support no-capacitor operation, even at zero load.
Is the NC pin on MIC5259-1.8BML-TR safe to connect to ground or leave floating?
The NC pin (Pin 5) on MIC5259-1.8BML-TR is internally unconnected and must remain unconnected on the PCB. Connecting it to ground, supply, or any other node may cause unpredictable behavior or damage; Micrel's datasheet explicitly prohibits routing or soldering to this pin.
How does the BYP pin on MIC5259-1.8BML-TR affect startup time?
Increasing the BYP capacitor value (e.g., from 0.01µF to 0.1µF) slightly increases MIC5259-1.8BML-TR turn-on time due to longer reference settling, but the integrated quick-start circuit minimizes this penalty. Startup remains under 100µs even with 1µF BYP, preserving responsiveness in wake-up sequences.
Does MIC5259-1.8BML-TR support reverse current protection?
No - MIC5259-1.8BML-TR lacks internal reverse current blocking. If VOUT exceeds VIN (e.g., during hot-swap or battery switchover), current can flow backward from OUT to IN through the pass device. An external Schottky diode or ideal diode controller is required for reverse polarity or backfeed protection.
MIC5259-1.8BML-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):
- 1.8V
- 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)
MIC5259-1.8BML-TR FAQ
1.How can I place an order for MIC5259-1.8BML-TR through Aetrix?
Please submit a Request for Quotation (RFQ) for MIC5259-1.8BML-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 MIC5259-1.8BML-TR reliable?
The price and inventory of MIC5259-1.8BML-TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MIC5259-1.8BML-TR is usually 5 days.
3.What payment methods are accepted for MIC5259-1.8BML-TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MIC5259-1.8BML-TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MIC5259-1.8BML-TR?
MIC5259-1.8BML-TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MIC5259-1.8BML-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 MIC5259-1.8BML-TR?
For technical support, including MIC5259-1.8BML-TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MIC5259-1.8BML-TR requirements.
6.How does Aetrix verify that MIC5259-1.8BML-TR is sourced from the original manufacturer or authorized distributors?
All MIC5259-1.8BML-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 MIC5259-1.8BML-TR meets industry standards.
7.What is the process for return or replacement of MIC5259-1.8BML-TR?
All MIC5259-1.8BML-TR units undergo pre-shipment inspection (PSI). If there is an issue with MIC5259-1.8BML-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 MIC5259-1.8BML-TR part is unused and in its original packaging.
Return procedure for MIC5259-1.8BML-TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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