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High-Efficiency LCD Boost with True Shutdown

First Fully Protected LCD and OLED Supplies in SOT23 Package

Product Details

The MAX8570 family of LCD step-up converters uses an internal n-channel switch and an internal p-channel output isolation switch. These converters operate from a 2.7V to 5.5V supply voltage and deliver up to 28V at the output.

A unique control scheme provides the highest efficiency over a wide range of load conditions. The internal MOSFET switch reduces external component count and a high switching frequency (up to 800kHz) allows for tiny surface-mount components. Three current-limit options are available. The MAX8570 and MAX8572 use a 110mA current limit to reduce ripple and component size in low-current applications. For high-power requirements, the MAX8574 and MAX8575 use a 500mA current limit and supply up to 20mA at 20V. The MAX8571 and MAX8573 use a 250mA current limit for a compromise between ripple and power. Built-in safety features protect the internal switch and down-stream components from fault conditions.

Additional features include a low quiescent current and a True Shutdown™ mode to save power. The MAX8570/MAX8571/MAX8574 allow the user to set the output voltage between 3V and 28V, and the MAX8572/MAX8573/MAX8575 have a preset 15V output. These step-up converters are ideal for small LCD panels with low current requirements, but can also be used in other applications. The MAX8571 evaluation kit is available to help reduce design time.

Key Features

  • 15V or Adjustable Output Voltage Up to 28V
  • Safety Features Protect Against Output Faults
  • 20mA at 20V from a Single Li+ Battery
  • True Shutdown
  • 87% Efficiency
  • Up to 800kHz Switching Frequency
  • Small, 6-Pin SOT23 and µDFN (MAX8570 Only) Packages

Applications/Uses

  • Cell Phones/Cordless Phones
  • Handy Terminals
  • LCD Bias Generators
  • Organizers
  • Palmtop Computers
  • PDAs and Other Handheld Devices
  • Polymer LEDs (OLED)
Parametric specs for Step-Up Switching Regulators
VIN (V) (min) 2.7
VIN (V) (max) 5.5
VOUT1 (V) (min) 2.7
VOUT1 (V) (max) 28
IOUT1 (A) (max) 0.025
Switch Type Internal
Preset VOUT (V) -
Output Adjust. Method Resistor
ICC (mA) (typ) 0.025
Shutdown Mode Supply Current (µA) (typ) 0.05
Shutdown Mode Supply Current (µA) (max) 1
# DC-DC Outputs 1
Package/Pins SOT23/6
Budgetary
Price (See Notes)
$1.41 @1k
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Simplified Block Diagram

MAX8570, MAX8571, MAX8572, MAX8573, MAX8574, MAX8575: Typical Application Circuit MAX8570, MAX8571, MAX8572, MAX8573, MAX8574, MAX8575: Typical Application Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX8571 evaluation kit (EV kit) contains a fully assembled and tested circuit for evaluating the MAX8571 step-up converter. This circuit operates with 2.7V to 5.5V input supply and provides a regulated 18V output at up to 10mA. The output voltage is adjustable from VCC to 28V by changing resistors on the EV kit. The MAX8571 EV kit contains a second unpopulated circuit to accomodate a larger inductor and diode for the higher-current-limited MAX8574 and MAX8575. Either circuit can be used to evaluate any of the parts in the MAX8570 family.

View Details

Features

  • 18V Output Voltage, Adjustable from VCC Up to 28V
  • Built-In Safety Features Protect Against Output Faults
  • True Shutdown™
  • 87% Efficiency
  • Up to 800kHz Switching Frequency
  • 0.01µA Shutdown Current
  • Fully Assembled and Tested
  • /en/design/design-tools/ee-sim.html?

    Support & Training

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    Parameters

    Parametric specs for Step-Up Switching Regulators
    VIN (V) (min) 2.7
    VIN (V) (max) 5.5
    VOUT1 (V) (min) 2.7
    VOUT1 (V) (max) 28
    IOUT1 (A) (max) 0.025
    Switch Type Internal
    Preset VOUT (V) -
    Output Adjust. Method Resistor
    ICC (mA) (typ) 0.025
    Shutdown Mode Supply Current (µA) (typ) 0.05
    Shutdown Mode Supply Current (µA) (max) 1
    # DC-DC Outputs 1
    Package/Pins SOT23/6
    Budgetary
    Price (See Notes)
    $1.41 @1k

    Key Features

    • 15V or Adjustable Output Voltage Up to 28V
    • Safety Features Protect Against Output Faults
    • 20mA at 20V from a Single Li+ Battery
    • True Shutdown
    • 87% Efficiency
    • Up to 800kHz Switching Frequency
    • Small, 6-Pin SOT23 and µDFN (MAX8570 Only) Packages

    Applications/Uses

    • Cell Phones/Cordless Phones
    • Handy Terminals
    • LCD Bias Generators
    • Organizers
    • Palmtop Computers
    • PDAs and Other Handheld Devices
    • Polymer LEDs (OLED)

    Description

    The MAX8570 family of LCD step-up converters uses an internal n-channel switch and an internal p-channel output isolation switch. These converters operate from a 2.7V to 5.5V supply voltage and deliver up to 28V at the output.

    A unique control scheme provides the highest efficiency over a wide range of load conditions. The internal MOSFET switch reduces external component count and a high switching frequency (up to 800kHz) allows for tiny surface-mount components. Three current-limit options are available. The MAX8570 and MAX8572 use a 110mA current limit to reduce ripple and component size in low-current applications. For high-power requirements, the MAX8574 and MAX8575 use a 500mA current limit and supply up to 20mA at 20V. The MAX8571 and MAX8573 use a 250mA current limit for a compromise between ripple and power. Built-in safety features protect the internal switch and down-stream components from fault conditions.

    Additional features include a low quiescent current and a True Shutdown™ mode to save power. The MAX8570/MAX8571/MAX8574 allow the user to set the output voltage between 3V and 28V, and the MAX8572/MAX8573/MAX8575 have a preset 15V output. These step-up converters are ideal for small LCD panels with low current requirements, but can also be used in other applications. The MAX8571 evaluation kit is available to help reduce design time.

    Simplified Block Diagram

    MAX8570, MAX8571, MAX8572, MAX8573, MAX8574, MAX8575: Typical Application Circuit MAX8570, MAX8571, MAX8572, MAX8573, MAX8574, MAX8575: 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