The LT1109 is a simple step-up DC/DC converter. Available in 8-pin SO, 3-lead TO-92 (fixed output only) or miniDIP packages, the devices require only three external components to construct a complete DC/DC converter. Current drain is just 320µA at no load, making the device ideal for cost-sensitive applications where standby current must be kept to a minimum. The LT1109-5 can deliver 5V at 100mA from a 3V input and the LT1109-12 can deliver 12V at 60mA from a 5V input. The 8-pin versions also feature a logic controlled SHUTDOWN pin that turns off the oscillator when taken low. The gated-oscillator design requires no frequency compensation components. The high frequency 120kHz oscillator permits the use of small surface mount inductors and capacitors. For a 5V to 12V at 120mA converter, see the LT1109A. For a 5V to 12V at 200mA converter with 20µA shutdown current, see the LT1301. Applications * Flash Memory VPP Generators * 3V to 5V Converters * 5V to 12V Converters * Disk Drives * PC Plug-In Cards * Peripherals * Battery-Powered Equipment * Uses Off-the-Shelf Inductors * Only 33µH Inductor Required * Low Cost * 3-Lead TO-92, SO8, or 8-Pin DIP * Adjustable or Fixed 5V or 12V Output * 120kHz Oscillator * Only Three External Components Required * 320µA IQ * 1.6V Minimum Start-Up Voltage * Logic Controlled Shutdown https://elecena.pl/product/377344/micropower-low-cost-dc-dc-converter-adjustable-and-fixed-5v-12v 2007-04-23 https://elecena.pl/product/377344/micropower-low-cost-dc-dc-converter-adjustable-and-fixed-5v-12v 2016-04-13 https://elecena.pl/product/377344/micropower-low-cost-dc-dc-converter-adjustable-and-fixed-5v-12v 2025-01-20