LT1109A Datasheet | Linear Technology

LT1109A Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V, 12V Features s s s s s s s DESCRIPTIO Uses Off-the-Shelf Inductors Low Cost 8-Pin DIP or SO Package Fixed 5V or 12V Output or Adjustable Version Only Four External ponents Required 360µA Standby Current Logic-Controlled Shutdown The LT1109A is a simple step-up DC/DC converter. The 8pin DIP or SOIC devices require only four external ponents to construct a plete 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 150m A from a 5V supply, enough power to program four flash memory chips simultaneously. The LT1109A-5 can deliver 5V at up to 110m A from a 2V input. The devices feature a shutdown pin that turns off the oscillator when taken low. The gatedoscillator design requires no frequency pensation ponents. High frequency 120k Hz operation permits the use of small surface mount inductors and capacitors. APPLICATI s s s s s s s Flash Memory VPP Generators 5V to 12V Converters 3.3V to 12V Converters Disk Drives PC Plug-In Cards Peripherals Battery-Powered Equipment TYPICAL APPLICATI All Surface Mount Flash Memory VPP Generator L1- 33µH MBRS130T3 3 SW VIN SENSE Output Current 13.0 12V 12.5 VOUT 2V/DIV OUTPUT VOLTAGE (V) +VIN 5V C1 22µF 10V VOUT 12V C2 47µF 20V 12.0 11.5 11.0 10.5 VIN = 5V + LT1109ACS8-12 SHUTDOWN PGND GND 4 5 + VIN = 4.5V SHUTDOWN 5V/DIV 500µs/DIV 1109A TA03 - - - COILTRONICS CTX33-2 SUMIDA CD54-330LC - - 1 = PROGRAM 0 = SHUTDOWN 1109A TA01 250 100 150 200 OUTPUT CURRENT (m A) 1109A TA02 Output...