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