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High-Efficiency LCD Boost with True Shutdown

First Fully Protected LCD and OLED Supplies in SOT23 Package

Product Details

Key Features

Applications/Uses

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) 0.015
Switch Type Internal
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

Technical Docs

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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) 0.015
Switch Type Internal
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 .