SC220EVB Semtech, SC220EVB Datasheet - Page 5

• Manufacturer Part Number: SC220EVB
• Description: SC220 20 MHz Step-Down Regulator (SOIC-8) Evaluation Board
• Manufacturer: Semtech

Block Diagram
Pin Descriptions
Pin #
1
2
3
4
5
6
7
8
Pin Name Pin Function
F B
E N
AGND
PGND
VOUT
PVIN
AVIN
SW
EN
FB
8
1
1 .0 V
Switching output node — connect to the output LC fi lter.
Power input supply voltage (2.7V to 5.5V).
Input for sensing the output of LC fi lter.
Input for regulation of output LC fi lter — Using R
to the typical application circuit diagram on page 1).
Enable Input — when low, circuit draws <1μA. Apply a square wave clock at EN to synchronize the switching frequency
with an external clock. It is recommended that the externally applied clock frequency should not be above 20MHz.
Input supply voltage.
Analog ground.
Power ground.
S y nc hroniz ation
E rror
A m p
E x ternal F req .
+
-
S hutdow n
T herm al
R E F
6
A G N D
1.0V
+
C om p
-
F requenc y
C ontrol
O S C
20 M H z
C ontrol Logic
5
1
C om pens ator
P G N D
and R
S oft- S tart
2
to set the output voltage, V
A V IN
7
Z C D
D riv er
C LIM
P V IN
OUT
3
= V
FB
x (1+ R
4
2
1
/R
2
V O U T
S W
). (Please refer
SC220
5