ELM605DA Datasheet, PDF (2/13 Pages) ELM Electronics – 2A synchronous step-down DC/DC converter

ELM605DA 2A synchronous step-down DC/DC converter
■Pin configuration
SOP-8(TOP VIEW)
1
8
2
7
3
6
4
5
Pin No.
1
2
3
4
5
6
7
8
Pin name
VCC
PG
GND
FB
EN
PGND
SW
VIN
Pin description
Supply voltage input
Power good
Ground
Feedback/Output voltage
Enable input
Power switch ground
Power switch output
Power switch supply voltage input
■Standard circuit
ELM605DA
Vin
8
2
VIN
PG
10µF 100k 10
1 _VCC
0.1µF
2.2µH
7
SW
5 _EN
PGND
6
4
FB
GND
3
■Block diagram
PG
100k
22µF
Vout
R1
Cup*
(option)
R2
Vout=0.8V*(1+R1/R2)
VCC
EN
500k ohm
Slop comp
+
Reference
VIN
Current
sence
amplifier
PWM _UG ^M1
logic
0.8V ₊
FB
-
Error
amplifier
Oscillator
+
-
PWM
comparator
Clock
SW
M2
LG
+
0.72V
-
PG
GND
DCC
Zero-current
comparator
PGND
13 - 2
Rev.1.2