Circuit Schematic - Analog Devices DC3018A Manual

DEMO MANUAL DC3018A
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CIRCUIT SCHEMATIC

1.2V, 12.5A Step-Down Converter
V
IN
2.25V TO
5V
22µF 0.22µF
0.1µF
4
Load Transient Response Forced
Continuous Mode
V
SG_INPUT
2V/DIV
V
I_STEP
200mV/DIV
1.2V
V
OUT
20mV/DIV
3.3V TO 1.2V
IN
LOADSTEP 2.5A TO 10A 1A/µs
Figure 3. Technique for Measuring Load Step Response
0.1µF
V
IN
EN
100nH
SW
MODE/SYNC
LTC3311S
FB
PGOOD
SSTT
AGND
ITH
RT V
PGND
15k
470pF
dc3018a CS01a
dc3018a F03
20µs/DIV
OUT
0.1µF 0.22µF
22µF
V
OUT
1.2V
12.5A
140k
6.8pF
22µF
×3
100k
1µF
IN
V
IN
Efficiency vs Load Current
100
90
EFFICIENCY
80
70
60
50
40
30
POWER LOSS
20
V
V
10
f = 2MHz
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13
I (A)
LOAD
4.0
3.6
3.2
2.8
2.4
2.0
1.6
1.2
0.8
= 3.3V
IN
= 1.2V
0.4
OUT
0
dc3018a CS01b
Rev. 0