Board Photo; Circuit Schematic - Analog Devices DC2990A Manual

DEMO MANUAL DC2990A

BOARD PHOTO

CIRCUIT SCHEMATIC

High Efficiency, 2MHz, 1.2V 3A Step-Down Converter
V
IN
1µF
4.7µF
0201
EN
MODE/SYNC
RT
2
= 2.25V TO 5.5V
1µF
0201
SW
V V
IN IN
SW
FB
LTC3307A
V
IN
AGND
PGND PGOOD
f = 2MHz
OSC
4.7µF
470nH
V
OUT
1.2V
3A
10pF 140k
15µF
x2
100k
10nF
Efficiency and Power Loss
in Burst Mode Operation
100
90
EFFICIENCY
80
70
60
50
40
POWER LOSS
30
V
V
20
f
10
Murata DFE201210S–R47M
0
0.001 0.01 0.1
LOAD CURRENT (A)
10
1
0.1
0.01
= 3.3V
IN
= 1.2V
OUT 0.001
= 2 MHz
SW
0.0001
1 3
Rev. 0