Datasheet

LT1765/LT1765-1.8/LT1765-2.5/
LT1765-3.3/LT1765-5
17
1765fd
APPLICATIONS INFORMATION
Figure 12. Positive-to-Negative Low Output Ripple Converter
C
C
1800pF
R
C
2.4k
C
F
100pF
OUTPUT
–5V AT 1A
L1: CDRH6D28-3R0
INPUT
5V
1765 F12
C2
0.22μF
D1
B220A
C1
10μF
6.3V X5R
CERAMIC
C3
2.2μF
16V X5R
CERAMIC
D2
CMDSH-3
L1
3μH
D3
B220A
BOOST
U1
LT1765-5
V
IN
22μF
V
SW
FB
SYNC
SHDN
GND
V
C
Figure 13. Negative Boost Converter
S
S
S
S
S
SS
S
S
S
S
S
S
S
INPUT
–5V
L1: CDRH5D28-2R5
BOLD LINES INDICATE HIGH CURRENT PATHS
OUTPUT
–9V AT 1A
1765 F13
C2
0.22μF
C
C
4700pF
R
C
6.8k
D1
UPS120
C1
2.2μF
6.3V X5R
C3
22μF
16V X5R
CERAMIC
D2
CMDSH-3
L1
2.5μH
BOOST
U1
LT1765FE
V
IN
V
SW
FB
SYNC
SHDN
GND
V
C
R2
10k
C
F
100pF
R1
64.9k