MAX1932

Digitally Controlled, 0.5% Accurate, Safest APD Bias Supply


Please check latest availability status for a specific part variant.

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.
MAX1932: Typical Application Circuit MAX1932: Typical Application Circuit Enlarge+

Key Features

  • Unique Architecture Delivers Excellent Accuracy for Improved System Performance
    • 0.5% Accurate Output
    • Low Ripple Output (< 1mV)
  • Protection Features Guarantee Safe Operation
    • Accurate High-Side Current Limit
    • Avalanche Indicator Flag
  • Output-Voltage Flexibility Facilitates Multiple Applications and Design Approaches
    • 4.5V to 90V Output
    • Set Output Voltage via 8-Bit SPI-Compatible Internal DAC, External DAC, or External Resistors
  • Small Circuit Footprint Reduces Equipment Size
    • 12-Pin, 4mm x 4mm Thin QFN Package
    • Circuit Height < 2mm
  • Commonly Available 2.7V to 5.5V Input Voltage Range

Applications/Uses

  • Fiber Optic Network Equipment
  • Laser Range Finders
  • Optical Receivers and Modules
  • PIN Diode Bias Supply
  • Telecom Equipment
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Output Adjust. MethodSwitch TypeICC
(mA)
Shutdown Mode Supply Current
(µA)
Shutdown Mode Supply Current
(µA)
DC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxtyptypmaxSee Notes
MAX1932 2.75.54.5900.01
Digital
Resistor
Voltage
External0.525651300
TQFN/12
$5.25 @1k
See All Step-Up Switching Regulators (98)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX1932EVKIT: MAX1932 Evaluation Kit

CAD Symbols and Footprints

  • MAX1932ETC
  • MAX1932ETC+
  • MAX1932ETC+T
  • MAX1932ETC-T
  • MAX1932ETC/GG8
  • MAX1932ETC/GG8-T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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    Type ID Title
    Reference Circuit3926HFRD-22.3: Modular GPON (MOGPON) ONT
    Evaluation Board3690MAX1932EVKIT MAX1932 Evaluation Kit