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LT1109

Linear Technology
Part Number LT1109
Manufacturer Linear Technology
Description Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V/ 12V
Published Mar 22, 2005
Detailed Description LT1109 Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V, 12V FEATURES s s s s s s s s s s DESCRIPTIO Uses O...
Datasheet PDF File LT1109 PDF File

LT1109
LT1109

Overview
LT1109 Micropower Low Cost DC/DC Converter Adjustable and Fixed 5V, 12V FEATURES s s s s s s s s s s DESCRIPTIO 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 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.
Foa a 5V to 12V at 200mA converter with 20µA shutdown current, see the LT1301.
APPLICATI s s s s s s s S Flash Memory VPP Generators 3V to 5V Converters 5V to 12V Converters Disk Drives PC Plug-In Cards Peripherals Battery-Powered Equipment TYPICAL APPLICATI L1¦ 33µH 3 VIN 5V 1 SW VIN SENSE 8 MBRS120T3 All Surface Mount Flash Memory VPP Generator 15 Output Voltage VIN = 5V 12 OUTPUT VOLTAGE (V) VOUT 12V 80mA 9 SHUTDOWN 5V/DIV 6 1ms/DIV LT1109 • TA02 LT1109CS8-12 7 SHUTDOWN* GND 4 SHUTDOWN PROGRAM LT1109 • TA01 + C1** 22µF 16V 3 * 8-PIN PACKAGE ONLY ¦ L1 = SUMIDA CD54-330LC (I OUT = 80mA) COILTRONICS CTX33-1 (80mA) MURATA-ERIE LQH4N330K (I OUT = 50mA) ISI LCS2414-330K (IOUT = 50mA) **C1 = MATSUO 267M1602226 OR EQUIVALENT 0 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA) LT1109 • TPC01 ...


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