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80V, 300mW Boost Converter and Current Monitor for APD Bias Applications

Integrated, High-Voltage Boost Converter and Current Monitor Reduce Cost and Board Space for APD Applications

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

Technical Docs

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Key Features

  • Input Voltage Range
    • +2.7V to +5.5V (Using Internal Charge Pump) or
    • +5.5V to +11V
  • Wide Output-Voltage Range from (VIN + 1V) to 76V
  • Internal 1Ω (typ) 80V Switch
  • 300mW Boost Converter Output Power
  • Accurate ±10% (500nA to 1mA) and ±3.5% (1mA to 4mA) High-Side Current Monitor
  • Resistor-Adjustable Ultra-Fast APD Current Limit (1µs Response Time)
  • Open-Drain Current-Limit Indicator Flag
  • 400kHz Fixed Switching Frequency
  • Constant PWM Frequency Provides Easy Filtering in Low-Noise Applications
  • Internal Soft-Start
  • 2µA (max) Shutdown Current
  • -40°C to +125°C Temperature Range
  • Small Thermally Enhanced, 4mm x 4mm, 16-Pin TQFN Package

Applications/Uses

  • Avalanche Photodiode Biasing and Monitoring
  • FBON Modules
  • GPON Modules
  • LCD Displays
  • Low-Noise Varactor Diode Bias Supplies
  • PIN Diode Bias Supplies

Description

The MAX15031 consists of a constant-frequency pulse-width modulating (PWM) step-up DC-DC converter with an internal switch and a high-side current monitor with high-speed adjustable current limiting. This device can generate output voltages up to 76V and provides current monitoring up to 4mA (up to 300mW). The MAX15031 can be used for a wide variety of applications such as avalanche photodiode biasing, PIN biasing, or varactor biasing, and LCD displays. The MAX15031 operates from 2.7V to 11V.

The constant-frequency (400kHz), current-mode PWM architecture provides low-noise output voltage that is easy to filter. A high-voltage, internal power switch allows this device to boost output voltages up to 76V. Internal soft-start circuitry limits the input current when the boost converter starts. The MAX15031 features a shutdown mode to save power.

The MAX15031 includes a current monitor with more than three decades of dynamic range and monitors current ranging from 500nA to 4mA with high accuracy. Resistor-adjustable current limiting protects the APD from optical power transients. A clamp diode protects the monitor's output from overvoltage conditions. Other protection features include cycle-by-cycle current limiting of the boost converter switch, undervoltage lockout, and thermal shutdown if the die temperature reaches +160°C.

The MAX15031 is available in a thermally enhanced 4mm x 4mm, 16-pin TQFN package and operates over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX15031: Typical Operating Circuits MAX15031: Typical Operating Circuits Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .