ELM605DA
2A synchronous step-down DC/DC converter
AP circuit
R4
Short and wide traces
ELM605DA
CIN
C8
VCC
PG
VIN
SW
8
1
2
VIN
L
R6
7
VOUT
VOUT
C5
Cout
6
5
3
4
GND
FB
PGND
EN
R1
R2
PGND
EN
SOP-8
TOP VIEW
■Evaluation circuit
C1=10
µ
F, C2=0.1
µF, C3=22
µF, C5=1nF, C7= NC, C8=0.1
µ
F, R3=100KΩ, R4=10, R6=100K, L=2.2µH
R1
R2
Vout=3.3V
Vout=1.8V
Vout=1.2V
Vout=1.0V
47K
12.5K
5K
15K
10K
10K
24K
6K
10
Ω
C2
0.1µF
C1
10µF
C8
0.1µF
U1
1
2
3
8
7
6
R2
Vout=0.8~(R1+R2)/
VCC
PG
VIN
SW
L=2.2µH
Vout
1
2
C3
GND PGND
22µF
4
5
EN
C5
1nF
FB
EN
R6
Vout
R1
R2
ELM605DA
100K
Ω
R3
EN
C7
NC
100K
Ω
PG
Vin
Rev.1.2
13 - 7
ELM-TECH [ ELM Technology Corporation ]
