Analog Devices LT1109A Product Info

• Uses Off-the-Shelf Inductors
• Low Cost
• 8-Pin DIP or SO Package
• Fixed 5V or 12V Output or Adjustable Version
• Only Four External Components Required
• 360µA Standby Current
• Logic-Controlled Shutdown

The LT1109A is a simple step-up DC/DC converter. The 8-pin DIP or SOIC devices require only four external components to construct a complete DC/DC converter. Current drain is just 360µA at no load, making the device ideal for cost-sensitive applications where standby current must be kept to a minimum.

The LT1109A-12 can deliver 12V at over 150mA from a 5V supply, enough power to program four flash memory chips simultaneously. The LT1109A-5 can deliver 5V at up to 110mA from a 2V input. The devices feature a shutdown pin that turns off the oscillator when taken low. The gatedoscillator design requires no frequency compensation components. High frequency 120kHz operation permits the use of small surface mount inductors and capacitors.

Applications

• Flash Memory VPP Generators
• 5V to 12V Converters
• 3.3V to 12V Converters
• Disk Drives
• PC Plug-In Cards
• Peripherals
• Battery-Powered Equipment