LT1109 Linear Technology, LT1109 Datasheet
LT1109
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LT1109 Summary of contents
Page 1
... 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 12V at 120mA converter, see the LT1109A. Foa 12V at 200mA converter with 20 A shutdown current, see the LT1301. U Output Voltage ...
Page 2
... LT1109 • PO103 T = 100 C, = 150 C/W JMAX JA S8 PART ORDER PART NUMBER MARKING LT1109CS8 1109 LT1109CS8-5 10905 LT1109CS8-12 10912 (LT1109CN8, LT1109CS8), unless otherwise specified CONDITIONS Switch Off LT1109 LT1109- LT1109-12 12V IN LT1109 LT1109-5 LT1109-12 Full Load I = 500mA ...
Page 3
... TEMPERATURE (°C) LT1109 • TPC05 (LT1109CN8, LT1109CS8), unless otherwise specified CONDITIONS V = 12V SW N8, S8 Package N8, S8 Package N8, S8 Package SHUTDOWN N8, S8 Package SHUTDOWN CE C HARA TERISTICS C Oscillator Frequency ...
Page 4
... GND LT1109-12 29k U LT1109Z OPER ATIO The LT1109Z-5 and LT1109Z-12 are fixed output voltage step-up DC/DC converters in a 3-pin TO-92 package. Power for internal regulator circuitry is taken from the V pin, a technique known as “bootstrapping.” Circuit OUT operation can be best understood by referring to the block diagram ...
Page 5
... L can be used. These equations assume that inductor current is zero. This situation is called “discon- tinuous mode operation” in switching regulator parlance. Setting “t” to the switch-ON time from the LT1109 speci- fication table (typically 4.2 s) will yield I “L” and the end of the switch-ON time can be calculated as ...
Page 6
... Although they are rated at 1A, the switching time of a 1N4001 is in the 10 s-50 s range. At best, efficiency will be severely compromised when these diodes are used; at worst, the circuit may not work at all. Most LT1109 circuits will be well served by a 1N5818 Schottky diode. The combination of 500mV forward drop at 1A current, fast ...
Page 7
... CELLS + 10 F 20V 10k VN2222 LT1109 • TA05 12V 40mA AT 3V INPUT 15mA AT 2V INPUT 2 CELLS 10 F 20V LT1109 • TA07 LT1109 Converter 22 H CADDELL-BURNS 1N5818 7120-17 5V 100mA AT 3V INPUT 20mA AT 2V INPUT SW V OUT LT1109CZ 16V GND LT1109 • ...
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... LT1109 PACKAGE DESCRIPTIO 0.300 – 0.320 (7.620 – 8.128) 0.065 (1.651) 0.009 – 0.015 TYP (0.229 – 0.381) +0.025 0.045 ± 0.015 0.325 –0.015 (1.143 ± 0.381) +0.635 8.255 –0.381 0.100 ± 0.010 (2.540 ± 0.254) 0.010 – 0.020 45 (0.254 – ...