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LT1109CN8-5 Datasheet(PDF) 1 Page - Linear Technology |
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LT1109CN8-5 Datasheet(HTML) 1 Page - Linear Technology |
1 / 8 page LT1109 1 Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V, 12V All Surface Mount Flash Memory VPP Generator S APPLICATI s Flash Memory VPP Generators s 3V to 5V Converters s 5V to 12V Converters s Disk Drives s PC Plug-In Cards s Peripherals s Battery-Powered Equipment APPLICATI TYPICAL s Uses Off-the-Shelf Inductors s Only 33 µH Inductor Required s Low Cost s 3-Lead TO-92, SO8, or 8-Pin DIP s Adjustable or Fixed 5V or 12V Output s 120kHz Oscillator s Only Three External Components Required s 320 µA IQ s 1.6V Minimum Start-Up Voltage s Logic Controlled Shutdown DESCRIPTIO S FEATURE The LT1109 is a simple step-up DC/DC converter. Avail- able 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 320 µA at no load, making the device ideal for cost-sensitive applications where standby cur- rent 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 induc- tors and capacitors. For a 5V to 12V at 120mA converter, see the LT1109A. Foa a 5V to 12V at 200mA converter with 20 µA shutdown current, see the LT1301. SHUTDOWN 5V/DIV OV VOUT 5V/DIV 1ms/DIV LT1109 • TA02 L1 LT1109 • TA01 + GND SW SENSE LT1109CS8-12 VOUT 12V 80mA MBRS120T3 VIN VIN 5V SHUTDOWN PROGRAM SHUTDOWN* * 8-PIN PACKAGE ONLY L1 = SUMIDA CD54-330LC (IOUT = 80mA) COILTRONICS CTX33-1 (80mA) MURATA-ERIE LQH4N330K (I OUT = 50mA) ISI LCS2414-330K (IOUT = 50mA) **C1 = MATSUO 267M1602226 OR EQUIVALENT ¦ ¦ 33 µH 1 7 3 8 C1** 22 µF 16V 4 Flash Memory Program Output OUTPUT CURRENT (mA) 0 0 3 6 9 12 15 10 100 LT1109 • TPC01 20 30 40 50 60 70 80 90 VIN = 5V Output Voltage |
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