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4.5V to 60V, Synchronous Step-Down Supercapacitor Charger Controller

Wide Input Voltage, High Efficiency, Switching Super Cap Battery Charger

Product Details

The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power supply solutions. The MAX17701 is a high efficiency, high voltage, Himalaya synchronous, step-down, supercapacitor charger controller designed to operate over an input-voltage range of a 4.5V to 60V. The MAX17701 operates over a -40°C to +125°C industrial temperature range and charges a supercapacitor with a ±4% accurate constant current. After the supercapacitor is charged, the device regulates the no-load output voltage with ±1% accuracy. The output voltage is programmable from 1.25V up to (VDCIN - 4V).

The MAX17701 supercapacitor charger controller is designed to provide a holistic application solution requiring backup energy storage with a precise charging capability. The device uses an external nMOSFET to provide input supply-side short-circuit protection; thus, preventing supercapacitor discharge.

The MAX17701 provides a safety timer (TMR) feature to set the maximum allowed constant current (CC) mode charging time. The device features an uncommitted comparator, which can be used to detect an output overvoltage event (OVI) and prevent the supercapacitor from overcharging. The MAX17701 is available in a 24-pin 4mm x 4mm TQFN package with an exposed pad.

Key Features

  • Optimized Feature Set for Supercapacitor Charging
    • ±4% Charging Current Regulation Accuracy
    • ±6% Charging Current Monitor Accuracy (ISMON)
    • ±1% Voltage Regulation Accuracy
    • Programmable CC Mode Charging Current (ILIM)
    • Wide 4.5V to 60V Input-Voltage Range
    • Adjustable Output-Voltage Range from 1.25V Up To (VDCIN - 4V)
    • 125kHz to 2.2MHz Adjustable Frequency with External Clock Synchronization (RT/SYNC)
  • Reliable Operation in Adverse Environmental Conditions
    • Input Short-Circuit Protection (GATEN)
    • Safety Timer Feature (TMR)
    • Output Overvoltage Protection (OVI)
    • Cycle-by-Cycle Overcurrent Limit
    • Programmable EN/UVLO Threshold
    • Fault Monitoring Open-Drain Output (FLG)
    • Overtemperature Protection
    • Wide -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range

Applications/Uses

  • Peak Power Delivery and Energy Storage
  • Backup Power for Industrial Safety
  • Ride-Through Last-Gasp Supplies
  • Portable Medical Equipment
  • Building and Home Automation Backup Power
Parametric specs for Battery Chargers
Charging VIN (V) (max) 60
Max. ICHG (A) 20
Cell Chemistry Supercapacitor
Protected VIN (V) (max) 60
Charger (V) 1.25 to 56
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/24
Budgetary
Price (See Notes)
$2.25 @1k
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Simplified Block Diagram

MAX17701: Typical Application Circuit MAX17701: Typical Application Circuit Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX17701EVKITA# (EV kit) provides a proven design to evaluate the MAX17701 high-efficiency, high- voltage, Himalaya synchronous step-down DC-DC super- capacitor charger controller. The EV kit provides constant current (CC) mode and constant voltage (CV) modes to charge supercapacitors. The EV kit is designed to deliver 20A CC mode current (ICHGMAX) and 5V CV mode volt- age (VOUT) from a 9V to 60V input supply. The EV kit supports up to continuous 10A load connected in parallel to supercapacitors at the output. The EV kit is optimized for 24V nominal input voltage application. The switching frequency of the EV kit is set at 350kHz (fSW) for optimum efficiency and component size. The EV kit features a safety timer (TMR) to set the maximum allowed constant cur- rent (CC) mode charging time. For more details about the IC benefits and features, refer MAX17701 IC data sheet.

View Details

Features

  • Operates from a 9V to 60V Input Supply
  • 20A CC Mode Charging Current
  • 5V CV Mode Output Voltage
  • 350kHz Switching Frequency
  • Resistor-Programmable UVLO Threshold
  • Input Short Protection
  • CC Mode Safety Timer (TMR)
  • Cycle-by-Cycle Overcurrent Limit
  • External Clock Synchronization (RT/SYNC)
  • Fault Monitoring Open-Drain Output (Active-Low FLG)
  • Charging Current Monitoring (ISMON)
  • Output Overvoltage Protection (OVI)
  • IC Overtemperature Protection
  • Proven PCB Layout
  • Fully Assembled and Tested

    /en/design/design-tools/ee-sim.html?

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    Parameters

    Parametric specs for Battery Chargers
    Charging VIN (V) (max) 60
    Max. ICHG (A) 20
    Cell Chemistry Supercapacitor
    Protected VIN (V) (max) 60
    Charger (V) 1.25 to 56
    Oper. Temp. (°C) -40 to +125
    Package/Pins TQFN-CU/24
    Budgetary
    Price (See Notes)
    $2.25 @1k

    Key Features

    • Optimized Feature Set for Supercapacitor Charging
      • ±4% Charging Current Regulation Accuracy
      • ±6% Charging Current Monitor Accuracy (ISMON)
      • ±1% Voltage Regulation Accuracy
      • Programmable CC Mode Charging Current (ILIM)
      • Wide 4.5V to 60V Input-Voltage Range
      • Adjustable Output-Voltage Range from 1.25V Up To (VDCIN - 4V)
      • 125kHz to 2.2MHz Adjustable Frequency with External Clock Synchronization (RT/SYNC)
    • Reliable Operation in Adverse Environmental Conditions
      • Input Short-Circuit Protection (GATEN)
      • Safety Timer Feature (TMR)
      • Output Overvoltage Protection (OVI)
      • Cycle-by-Cycle Overcurrent Limit
      • Programmable EN/UVLO Threshold
      • Fault Monitoring Open-Drain Output (FLG)
      • Overtemperature Protection
      • Wide -40°C to +125°C Ambient Operating Temperature Range/ -40°C to +150°C Junction Temperature Range

    Applications/Uses

    • Peak Power Delivery and Energy Storage
    • Backup Power for Industrial Safety
    • Ride-Through Last-Gasp Supplies
    • Portable Medical Equipment
    • Building and Home Automation Backup Power

    Description

    The Himalaya series of voltage regulator ICs, power modules, and chargers enable cooler, smaller, and simpler power supply solutions. The MAX17701 is a high efficiency, high voltage, Himalaya synchronous, step-down, supercapacitor charger controller designed to operate over an input-voltage range of a 4.5V to 60V. The MAX17701 operates over a -40°C to +125°C industrial temperature range and charges a supercapacitor with a ±4% accurate constant current. After the supercapacitor is charged, the device regulates the no-load output voltage with ±1% accuracy. The output voltage is programmable from 1.25V up to (VDCIN - 4V).

    The MAX17701 supercapacitor charger controller is designed to provide a holistic application solution requiring backup energy storage with a precise charging capability. The device uses an external nMOSFET to provide input supply-side short-circuit protection; thus, preventing supercapacitor discharge.

    The MAX17701 provides a safety timer (TMR) feature to set the maximum allowed constant current (CC) mode charging time. The device features an uncommitted comparator, which can be used to detect an output overvoltage event (OVI) and prevent the supercapacitor from overcharging. The MAX17701 is available in a 24-pin 4mm x 4mm TQFN package with an exposed pad.

    Simplified Block Diagram

    MAX17701: Typical Application Circuit MAX17701: Typical Application 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.