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Maxim > Products > [Optoelectronics]  [Power and Battery Management] 
MAX1932
Digitally Controlled, 0.5% Accurate, Safest APD Bias Supply


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Status
Active: In Production.

Data Sheet
FULL DATA SHEET (PDF, 284kB)
Download this datasheet in PDF formatDownload   Send this datasheet to any email addressE-Mail

Description
The MAX1932 generates a low-noise, high-voltage output to bias avalanche photodiodes (APDs) in optical receivers. Very low output ripple and noise is achieved by a constant-frequency, pulse-width modulated (PWM) boost topology combined with a unique architecture that maintains regulation with an optional RC or LC post filter inside its feedback loop. A precision reference and error amplifier maintain 0.5% output voltage accuracy.

The MAX1932 protects expensive APDs against adverse operating conditions while providing optimal bias. Traditional boost converters measure switch current for protection, whereas the MAX1932 integrates accurate high-side current limiting to protect APDs under avalanche conditions. A current-limit flag allows easy calibration of the APD operating point by indicating the precise point of avalanche breakdown. The MAX1932 control scheme prevents output overshoot and undershoot to provide safe APD operation without data loss.

The output voltage can be accurately set with either external resistors, an internal 8-bit DAC, an external DAC, or other voltage source. Output span and offset are independently settable with external resistors. This optimizes the utilization of DAC resolution for applications that may require limited output voltage range, such as 4.5V to 15V, 4.5V to 45V, 20V to 60V, or 40V to 90V.

An evaluation kit is available:  MAX1932EVKIT  

Key Features   Applications/Uses
  • Small Circuit Footprint
  • Circuit Height < 2mm
  • 2.7V to 5.5V Input
  • 4.5V to 90V Output
  • No Overshoot
  • Accurate High-Side Current Limit
  • Avalanche Indicator Flag
  • 8-Bit SPI-Compatible DAC
  • Compatible with External DAC
  • 0.5% Accurate Output
  • Low Ripple Output (< 1mV)
  • Small 12-Pin, 4mm x 4mm Thin QFN Package

 
  		• Fiber Optic Network Equipment
  		• Laser Range Finders
  		• Optical Receivers and Modules
  		• PIN Diode Bias Supply
  		• Telecom Equipment

    Key Specifications:  Step-Up Switching Regulators
    Part Number VIN
    (V)    		 VIN
    (V)    		 VOUT
    (V)    		 VOUT
    (V)    		 Max. IOUT
    (A)    		 Max. IOUT
    (A)    		 Output Adjust. Method DC-DC Outputs Oper. Freq.
    (kHz)    		 Package/Pins Smallest Available Pckg.
    (mm2)    		 Price
    min max min max ≥ ≤ max w/pins See Notes
    MAX1932  2.7 5.5 4.5 90 0.01 0.01
    Digital
    Resistor
    Voltage
    		 1 300
    TQFN/12
    		 17 $3.10 @1k
    See All Step-Up Switching Regulators (91)

    Diagram
    MAX1932: Typical Application Circuit
    Typical Application Circuit

    Application Notes
  		• Application Note 1805: Choosing the MAX1932 External Inductor, Diode, Current-Sense Resistor, and Output Filter Capacitors for Worst-Case Conditions - MAX1932
  		• Application Note 2031: DC-DC Converter Tutorial - MAX1932
  		• Application Note 2931: HFTA-09.0: T3/E3/STS-1 Fiber Optic Extension - MAX1932
  		• Application Note 3258: HFTA-08.0: Receivers and Transmitters in DWDM Systems - MAX1932
  		• Application Note 3445: High-Voltage LED Driver Provides Software-Controlled Intensity - MAX1932
  		• Application Note 3812: HFRD-22.2: Modular GPON (MOGPON) ONT - MAX1932
  		• Application Note 3926: HFRD-22.3: Modular GPON (MOGPON) ONT - MAX1932
  		• Application Note 3929: Avalanche-Photodiode Detector Circuit Limits Current to 1mA and Improves Transient Response - MAX1932

    Evaluation Kits
  		• MAX1932EVKIT

    Design Guides
  		• Fiber (PDF)

    Reliability Reports
  		• Reliability Report: MAX1932.pdf
  		• Show FIT data for:

    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

    MAX1932 Free
    Sample    		 Buy Status
    Package: TYPE PINS FOOTPRINT
      DRAWING CODE/VAR *
    		Temp RoHS/Lead-Free?
    Materials Analysis
    MAX1932ETC    
    		Active TQFN;12 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0068 (PDF)
    Use pkgcode/variation: T1244-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1932ETC-T    
    		Active TQFN;12 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0068 (PDF)
    Use pkgcode/variation: T1244-4*
    		-40°C to +85°C RoHS/Lead-Free: No
    Materials Analysis
    MAX1932ETC+  
    		Active TQFN;12 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0068 (PDF)
    Use pkgcode/variation: T1244+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis
    MAX1932ETC+T    
    		Active TQFN;12 pin;17 mm²
    Outline Drawing: 21-0139 (PDF)
    Land Pattern: 90-0068 (PDF)
    Use pkgcode/variation: T1244+4*
    		-40°C to +85°C RoHS/Lead-Free: Lead Free
    Materials Analysis

    More Information
  		• Topmark Coding: MAX1932
  		• New Product Press Release 2002-08-30 

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    Document Ref.: 19-2555; Rev 1; 2003-03-07
    This page last modified: 2007-07-13


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