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LT1109A Datasheet(PDF) 1 Page - Linear Technology |
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LT1109A Datasheet(HTML) 1 Page - Linear Technology |
1 / 8 page 1 LT1109A Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V, 12V APPLICATI TYPICAL Output Voltage VOUT 2V/DIV SHUTDOWN 5V/DIV 500 µs/DIV 1109A TA03 12V Output Current OUTPUT CURRENT (mA) 0 13.0 12.5 12.0 11.5 11.0 10.5 10.0 50 100 150 200 1109A TA02 250 300 VIN = 4.5V VIN = 5V S FEATURE s Uses Off-the-Shelf Inductors s Low Cost s 8-Pin DIP or SO Package s Fixed 5V or 12V Output or Adjustable Version s Only Four External Components Required s 360 µA Standby Current s Logic-Controlled Shutdown S APPLICATI s Flash Memory VPP Generators s 5V to 12V Converters s 3.3V to 12V Converters s Disk Drives s PC Plug-In Cards s Peripherals s Battery-Powered Equipment The LT1109A is a simple step-up DC/DC converter. The 8- pin DIP or SOIC devices require only four external compo- nents to construct a complete DC/DC converter. Current drain is just 360 µA 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 gated- oscillator design requires no frequency compensation components. High frequency 120kHz operation permits the use of small surface mount inductors and capacitors. DESCRIPTIO All Surface Mount Flash Memory VPP Generator + SENSE VIN PGND GND LT1109ACS8-12 SHUTDOWN SW MBRS130T3 8 3 1 7 45 C2 47 µF 20V VOUT 12V L1* 33 µH COILTRONICS CTX33-2 SUMIDA CD54-330LC 1 = PROGRAM 0 = SHUTDOWN + +VIN 5V C1 22 µF 10V 1109A TA01 ** * ** |
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