LT1111_15 Datasheet, PDF (14/16 Pages) Linear Technology – Micropower DC/DC Converter Adjustable and Fixed 5V, 12V

LT1111
TYPICAL APPLICATI S
3V to – 22V LCD Bias Generator
L1*
27µH
1N4148
2 × 1.5V
CELLS
R1
100Ω
I_LIM
V _IN
SW1
732k
1%
3V
LT1111
FB
GND
SW2
+
4.7µF
39.2k
1%
MBRS130T3
MBRS130T3
0.1µF
* L1 = SUMIDA CD54-270K
FOR 5V INPUT CHANGE R1 TO 47Ω.
CONVERTER WILL DELIVER –22V AT 40mA.
9V to 5V Step-Down Converter
9V
BATTERY
100Ω
I_LIM
V _IN
SW1
LT1111-5
SENSE
GND
SW2 _L1*
15µH
+
MBRS130T3
22µF
5V OUTPUT
150mA AT 9V INPUT
50mA AT 6.5V INPUT
+
22µF 220k
–22V OUTPUT
7mA AT 2V INPUT
LT1111 • TA03
20V to 5V Step-Down Converter
V_IN
12V TO 28V
100Ω
I_LIM
V _IN
SW1
LT1111-5
SENSE
GND
SW2
L1*
68µH
+
MBRS130T3
5V OUTPUT
300mA
47µF
* L1 = SUMIDA CD54-150K
LT1111 • TA04
* L1 = SUMIDA CD74-680M
LT1111 • TA06
V_IN
5V INPUT
+
22µF
5V to –5V Converter
100Ω
I_LIM
V _IN
SW1
LT1111-5
SENSE
GND
SW2
L1*
33µH
MBRS130T3 ₊
33µF
* L1 = SUMIDA CD54-330K
14
V_IN
5V TO 12V
Voltage Controlled Positive-to-Negative Converter
0.22Ω
ZETEX^†
ZTX788A
BAT54
220Ω
V _IN
I_LIM
220Ω
SW1
LT1111
FB
GND
SW2
V _IN
LT1006
L1*
20µH, 3A
+
MBRD320
200k
39k
47µF
–V_OUT = –5.13 × V_C
2W MAXIMUM OUTPUT
V_C (0V TO 5V)
–5V OUTPUT
75mA
LT1111 • TA05
* L1 = COILTRONICS CTX20-4
† _{ZETEX INC. 516-543-7100}
LT1111 • TA07
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