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MAX1385, MAX1386*
Dual RF LDMOS Bias Controllers with I²C/SPI Interface

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*Future Product
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    Status
    Part Number Status
    MAX1385 Active: In Production.
    MAX1386 Future Product

    Data Sheet
    FULL DATA SHEET (PDF, 508kB)
    Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail


    Description
    The MAX1385/MAX1386 set and control bias conditions for dual RF LDMOS power devices found in cellular base stations. Each device includes a high-side current-sense amplifier with programmable gains of 2, 10, and 25 to monitor LDMOS drain current over the 20mA to 5A range. Two external diode-connected transistors monitor LDMOS temperatures while an internal temperature sensor measures the local die temperature of the MAX1385/MAX1386. A 12-bit ADC converts the programmable- gain amplifier (PGA) outputs, external/internal temperature readings, and two auxiliary inputs.

    The two gate-drive channels, each consisting of 8-bit coarse and 10-bit fine DACs and a gate-drive amplifier, generate a positive gate voltage to bias the LDMOS devices. The MAX1385 includes a gate-drive amplifier with a gain of 2 and the MAX1386 gate-drive amplifier provides a gain of 4. The 8-bit coarse and 10-bit fine DACs allow up to 18 bits of resolution. The MAX1385/MAX1386 include autocalibration features to minimize error over time, temperature, and supply voltage.

    The MAX1385/MAX1386 feature an I²C/SPI™-compatible serial interface. Both devices operate from a 4.75V to 5.25V analog supply (3.2mA supply current), a 2.7V to 5.25V digital supply (3.1mA supply current), and a 4.75V to 11.0V gate-drive supply (4.5mA supply current). The MAX1385/MAX1386 are available in a 48-pin thin QFN package.

    An evaluation kit is available:  MAX1385EVC16, MAX1385EVKIT  

    Key Features   Applications/Uses
    • Integrated High-Side Drain Current-Sense PGA with Gain of 2, 10, or 25
    • ±0.5% Accuracy for Sense Voltage Between 75mV and 250mV
    • Full-Scale Sense Voltage of 100mV with Gain of 25
    • Full-Scale Sense Voltage of 250mV with Gain of 10
    • Common-Mode Range of 5V to 30V Drain Voltage for LDMOS
    • Adjustable Low Noise 0 to 5V, 0 to 10V Output Gate-Bias Voltage Ranges with ±10mA Gate Drive
    • Fast Clamp to 0V for LDMOS Protection
    • 8-Bit DAC Control of Gate-Bias Voltage
    • 10-Bit DAC Control of Gate-Bias Offset with Temperature
    • Internal Die Temperature Measurement
    • External Temperature Measurement by Diode-Connected Transistor (2N3904)
    • Internal 12-Bit ADC Measurement of Temperature, Current, and Voltages
    • Selectable I²C-/SPI-Compatible Serial Interface
      • 400kHz/1.7MHz/3.4MHz I²C-Compatible Control for Settings and Data Measurement
      • 16MHz SPI-Compatible Control for Settings and Data Measurement
    • Internal 2.5V Reference
    • Three Address Inputs to Control Eight Devices in I²C Mode

     
  • Industrial Process Control
  • RF LDMOS Bias-Control in Cellular Base Stations

    Diagram
    MAX1385, MAX1386: Typical Operating Circuit (I²C Mode)
    Typical Operating Circuit (I²C Mode)

    Application Notes
  • Application Note 4065: Implementing a MAX1385-Based Control Loop in C/C++ - MAX1385, MAX1386

    Evaluation Kits
  • MAX1385EVC16, MAX1385EVKIT

    Design Guides
  • Wireless Infrastructure (PDF)

    Reliability Reports
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    Software/Models
    none

    Ordering Information
    Notes:

    1. Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
    2. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
    3. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions.
    4. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.


    Devices: 1-4 of 4

    MAX1385 Free
    Sample
    Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1385BUTM+T    
    Active

    Land Pattern: Not Available

    0°C to +85°C See data sheet
    MAX1385BETM+T    
    Active

    Land Pattern: Not Available

    -40°C to +85°C See data sheet
    MAX1385BETM+  
    Active TQFN;48 pin;50.4 mm²
    Outline Drawing: 21-0144 (PDF)
    Land Pattern: 90-0039 (PDF)
    Use pkgcode/variation: T4877M+6*
    -40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1385BUTM+    
    Active TQFN;48 pin;50.4 mm²
    Outline Drawing: 21-0144 (PDF)
    Land Pattern: 90-0039 (PDF)
    Use pkgcode/variation: T4877M+6*
    0°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  • New Product Press Release 2009-04-02 

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    Document Ref.: 19-4456; Rev 0; 2009-02-25
    This page last modified: 2009-09-04


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