LTC1693
U
TYPICAL APPLICATIONS
5V to 12V Boost Converter
R2
13k
1%
R1
D1
BAT85
7.5k
1%
V
CC
= 5V
+
C2
0.1µF
C3
4.7µF
L1*
22µH
D2
1N5819
V
OUT
8
12V
50mA
1
7
Q1
BS170
LTC1693-3
4
+
C
L
3
C1
680pF
47µF
1693 TA06a
INDUCTOR PEAK CURRENT ≈600mA
R2, C1 SET THE OSCILLATION FREQUENCY AT 200kHz
R1 SETS THE DUTY CYCLE AT 45%
EFFICIENCY ≈80% AT 50mA LOAD
*SUMIDA CDRH125-220
Efficiency
Output Voltage
18
16
14
12
10
8
100
90
V
= 5V
V
= 5V
CC
CC
50mA LOAD
50mA LOAD
80
70
60
50
6
35
45
50
55
60
65
40
10
12
13
14
15
16
11
DUTY CYCLE (%)
OUTPUT VOLTAGE (V)
1693 TA06b
1693 TA06c
15