MAX1605: 30V Internal Switch LCD Bias Supply Data Sheet (Rev. 2)12/3/20181M
Features and Benefits
- Adjustable Output Voltage up to 30V
- 20mA at 20V from a Single Li+ Battery
- 88% Efficiency
- Up to 500kHz Switching Frequency
- Selectable Inductor Current Limit (125mA, 250mA, or 500mA)
- 18µA Operating Supply Current
- 0.1µA Shutdown Current
- Avaiable in Two Small Packages
- 6-Pin TDFN
- 6-Pin SOT23
The MAX1605 boost converter contains a 0.5A internal switch in a tiny 6-pin SOT23 package. The IC operates from a +2.4V to +5.5V supply voltage, but can boost battery voltages as low as 0.8V up to 30V at the output.
The MAX1605 uses a unique control scheme providing the highest efficiency over a wide range of load conditions. An internal 0.5A MOSFET reduces external component count, and a high switching frequency (up to 500kHz) allows for tiny surface-mount components. The current limit can be set to 500mA, 250mA, or 125mA, allowing the user to reduce the output ripple and component size in low-current applications.
Additional features include a low quiescent supply current and a shutdown mode to save power. The MAX1605 is ideal for small LCD panels with low current requirements, but can also be used in other applications. A MAX1605EVKIT evaluation kit (EV kit) is available to help speed up design time.
- Cell Phones/Cordless Phones
- Handy Terminals
- LCD Bias Generators
- Palmtop Computers
- PDAs and Other Handheld Devices
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
The MAX1605 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a boost switching converter that generates a positive voltage to drive low-power LCD displays. The circuit is configured for a +18V output voltage and provides up to 30mA. Higher output voltages are possible by selecting different components.
The IC operates from a +2.4V to +5.5V supply voltage but can boost battery voltages as low as +0.8V up to +30V at the output. Three different inductor current limits can be evaluated with the EV kit as configured.
The MAX1605 EV kit demonstrates low quiescent current and high efficiency up to 88% for maximum battery life. Operation up to 500kHz allows the use of tiny surface-mount components.
Features & Benefits
- Input Voltage
- +0.8V to +18V (as configured)
- +2.4V to +5.5V (IC VCC)
- Output Voltage
- +18V Output up to 30mA (as configured)
- Output Voltage Adjustable with Resistors
- Adjustable Inductor Current-Limit Setting
- Internal MOSFET Switches
- 1µA (typ) IC Shutdown Current
- Switching Frequency up to 500kHz
- Surface-Mount Components
- Fully Assembled and Tested
Documentation & Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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