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76V, 300mW Boost Converter and Current Monitor for APD Bias Applications

High-Voltage Boost Converter and Current Monitor Reduce Cost and Board Space for Avalanche Photo-Diode Applications

Product Details

The MAX15059 constant-frequency pulse-width modulating (PWM) step-up DC-DC converter features an internal switch and a high-side current monitor with high-speed adjustable current limiting. This device is capable of generating output voltages up to 76V (300mW for the MAX15059A and 200mW for the MAX15059B) and provides current monitoring up to 4mA. The MAX15059 operates from 2.8V to 5.5V.

The constant-frequency (400kHz) current-mode PWM architecture provides low-noise-output voltage that is easy to filter. A high-voltage internal power MOSFET allows this device to boost output voltages up to 76V. Internal soft-start circuitry limits the input current when the boost converter starts. The MAX15059 features a shutdown mode to save power.

The MAX15059 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 (UVLO), and thermal shutdown if the die temperature reaches +125°C.

The MAX15059 is available in a thermally enhanced, lead-free, 16-pin TQFN-EP package and operates over the -40°C to +125°C temperature range.

Key Features

  • Input Voltage Range: +2.8V to +5.5V
  • Wide Output-Voltage Range from (VIN + 5V) to 76V
  • Internal 1Ω (typ) 80V MOSFET
  • Boost Converter Output Power: 300mW
  • 200mW Version Available for Smaller Inductor
  • Accurate ±5% (1:1 and 5:1) 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, 3mm x 3mm, Lead-Free, 16-Pin TQFN-EP Package

Applications/Uses

  • Avalanche Photodiode Biasing and Monitoring
  • FBON Modules
  • GPON Modules
  • Low-Noise Varactor Diode Bias Supply
  • PIN Diode Bias Supply
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.8
VIN (V) (max) 5.5
VOUT1 (V) (min) 8
VOUT1 (V) (max) 76
IOUT1 (A) (max) 0.005
Switch Type Internal
Output Adjust. Method Resistor
Voltage
ICC (mA) (typ) 0.6
Shutdown Mode Supply Current (µA) (typ) 0.003
Shutdown Mode Supply Current (µA) (max) 2
# DC-DC Outputs 1
Switching Frequency (kHz) 400
Package/Pins TQFN/16
Budgetary
Price (See Notes)
$1.97 @1k
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Simplified Block Diagram

MAX15059: Typical Operating Circuit MAX15059: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX15059 evaluation kit (EV kit) demonstrates the MAX15059 APD biasing pulse-width modulation (PWM) step-up DC-DC converter with an internal power switch, current monitor, and adjustable current limiting. The step-up converter switches at 400kHz. The EV kit operates from a DC supply voltage of 2.8V to 5.5V and is configured to deliver approximately 70V, and 0 to 4mA of current at the output. The output voltage can be configured from VIN + 5V to 76V by replacing a resistor or adjusting the CNTRL voltage. The EV kit demonstrates the IC's APD fast current-limit, undervoltage-lockout (UVLO), and thermal-shutdown features.

The EV kit also features an APD input load-simulator circuit for current monitoring and step-response measurements.

The EV kit comes with the MAX15059AETE+ installed, but can also be used to evaluate the MAX15059BETE+.

Warning: Voltages exceeding 42V may exist on the VOUT, APD, MOUT, and PGND PCB pads.

View Details

Features

  • 2.8V to 5.5V Supply Voltage Range
  • 70V Output Voltage (Approximate)
  • 0 to 4mA Output Current
  • Demonstrates APD Fast Current Limit
  • Demonstrates Undervoltage Lockout
  • Demonstrates Thermal-Shutdown Feature
  • MOUT Output Overvoltage Protection Through Clamping Circuit
  • Fully Assembled and Tested

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Parameters

Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.8
VIN (V) (max) 5.5
VOUT1 (V) (min) 8
VOUT1 (V) (max) 76
IOUT1 (A) (max) 0.005
Switch Type Internal
Output Adjust. Method Resistor
Voltage
ICC (mA) (typ) 0.6
Shutdown Mode Supply Current (µA) (typ) 0.003
Shutdown Mode Supply Current (µA) (max) 2
# DC-DC Outputs 1
Switching Frequency (kHz) 400
Package/Pins TQFN/16
Budgetary
Price (See Notes)
$1.97 @1k

Key Features

  • Input Voltage Range: +2.8V to +5.5V
  • Wide Output-Voltage Range from (VIN + 5V) to 76V
  • Internal 1Ω (typ) 80V MOSFET
  • Boost Converter Output Power: 300mW
  • 200mW Version Available for Smaller Inductor
  • Accurate ±5% (1:1 and 5:1) 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, 3mm x 3mm, Lead-Free, 16-Pin TQFN-EP Package

Applications/Uses

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

Description

The MAX15059 constant-frequency pulse-width modulating (PWM) step-up DC-DC converter features an internal switch and a high-side current monitor with high-speed adjustable current limiting. This device is capable of generating output voltages up to 76V (300mW for the MAX15059A and 200mW for the MAX15059B) and provides current monitoring up to 4mA. The MAX15059 operates from 2.8V to 5.5V.

The constant-frequency (400kHz) current-mode PWM architecture provides low-noise-output voltage that is easy to filter. A high-voltage internal power MOSFET allows this device to boost output voltages up to 76V. Internal soft-start circuitry limits the input current when the boost converter starts. The MAX15059 features a shutdown mode to save power.

The MAX15059 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 (UVLO), and thermal shutdown if the die temperature reaches +125°C.

The MAX15059 is available in a thermally enhanced, lead-free, 16-pin TQFN-EP package and operates over the -40°C to +125°C temperature range.

Simplified Block Diagram

MAX15059: Typical Operating Circuit MAX15059: Typical Operating Circuit 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