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Switching Regulators 
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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
MAX8573
High-Efficiency LCD Boost with True Shutdown
First Fully Protected LCD and OLED Supplies in SOT23 Package
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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.
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) | 15 |
| VOUT1 (V) (max) | 15 |
| IOUT1 (A) (max) | 0.015 |
| Switch Type | Internal |
| Preset VOUT (V) | 15 |
| Output Adjust. Method | Preset |
| 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 |
View More
Simplified Block Diagram
MAX8570, MAX8571, MAX8572, MAX8573, MAX8574, MAX8575: Typical Application Circuit
Technical Docs
| Data Sheet | High-Efficiency LCD Boost with True Shutdown | Mar 24, 2010 |
Click any title below to view the detail page where available.
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.
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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) | 15 |
| VOUT1 (V) (max) | 15 |
| IOUT1 (A) (max) | 0.015 |
| Switch Type | Internal |
| Preset VOUT (V) | 15 |
| Output Adjust. Method | Preset |
| 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.
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 Technical Docs
| Data Sheet | High-Efficiency LCD Boost with True Shutdown | Mar 24, 2010 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal
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