QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 476
1.25MHZ 3A PEAK SWITCH CURRENT MONOLITHIC STEP-DOWN CONVERTER
Ceramic
Other frequency comp. option... R3=2.4k, C3=10nF, C7=open
C4
100pF
C7
100pF
D3 CMDSH-3
R2
10.0k
C3
4.7nF
C5
22uF 6.3V X5R 1206
C8
0.22uF, 16V
R1
10.7k
10-14Vin
Vin
Vout
2.5V @2.5A
U1
LT1765EFE
/Shdn
FB
Vc
Gnd
Boost
Vsw
Sync
Vin
Ceramic
R3
3.3k
C2
2.2uF 25V X7R 1206
L1
CDRH5D28-2R5M
D1
B320A
Figure 5.
Modifications to the Demo Circuit that Optimize the Load Response for V
IN
= 10V–14V, V
OUT
= 2.5V at 2.5A
Vin
C3
1000pF
C2
2.2uF 25V X7R 1206
Vout
Ceramic
C5
10uF 6.3V X5R 0805
D2 CMDSH-3
C8
0.22uF
3.3V @2A
R1
17.4k
D1
B220A
L1
CDRH5D28-2R5M
12V +/-10%
R3
4.7k
C4
100pF
R2
10.0k
Ceramic
C7
62pF
U1
LT1765EFE
/Shdn
FB
Vc
Gnd
B
oost
Vsw
Sync
Vin
Figure 6.
Modifications to the Demo Circuit that Optimize the Load Response for V
IN
= 12V±10%, V
OUT
= 3.3V at 2A
C8
0.22uF
R1
31.6k
Vout
Vin
Ceramic
C3
10nF
R3
2.4k
U1
LT1765EFE
/Shdn
FB
Vc
Gnd
Boost
Vsw
Sync
Vin
C2
2.2uF 25V X7R 1206
R2
10.0k
12V +/-10%
D1
B220A
D2 CMDSH-3
C5
10uF 6.3V X5R 0805
L1
A916CY-2R7M
5V @2A
Ceramic
C7
62pF
C4
100pF
Figure 7.
Modifications to the Demo Circuit that Optimize the Load Response for V
IN
= 12V±10%, V
OUT
= 5V at 2A
4
