QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 476
1.25MHZ 3A PEAK SWITCH CURRENT MONOLITHIC STEP-DOWN CONVERTER
Vout
Vin
C7
62pF
U1
LT1765EFE
/Shdn
FB
Vc
Gnd
Boost
Vsw
Sync
Vin
R3
2.4k
C2
2.2uF 25V X7R 1206
C5
10uF 6.3V X5R 0805
Ceramic
R2
10.0k
D2 CMDSH-3
D1
B220A
R1
17.4k
14-16V
C3
1800pF
C4
100pF
3.3V @2.5A
L1
CDRH5D28-2R5M
Ceramic
C8
0.22uF
Figure 8.
Modifications to the Demo Circuit that Optimize the Load Response for V
IN
= 14V–16V, V
OUT
= 3.3V at 2.5A
D1
B220A
U1
LT1765EFE
/Shdn
FB
Vc
Gnd
B
oost
Vsw
Sync
Vin
3-5.5V
Vout
C8
0.22uF
C4
100pF
Vin
C3
10nF
C2
2.2uF 10V X5R 0805
R3
1.0k
R1
4.99k
Ceramic
D3 CMDSH-3
C5
10uF 6.3V X5R 0805
L1
CDRH4D28-1R2M
R2
10.0k
Ceramic
1.8V @2A
Figure 9.
Modifications to the Demo Circuit that Optimize the Load Response for V
IN
= 3V–5.5V, V
OUT
= 1.8V at 2A
Vout
U1
LT1765EFE
/Shdn
FB
Vc
Gnd
Boost
Vsw
Sync
Vin
C7
62pF
Vin
C4
100pF
R1
17.4k
5-15V
L1
CDRH6D28-3R0M
Ceramic
C3
10nF
R2
10.0k
R3
3.3k
C2
2.2uF 25V X7R 1206
D1
B220A
C8
0.22uF
Ceramic
D2 CMDSH-3
C5
22uF 6.3V X5R 1206
3.3V @2A
Figure 10.
Modifications to the Demo Circuit that Optimize the Load Response for V
IN
= 5V–15V, V
OUT
= 3.3V at 2A
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