MIC4574
Micrel
Block Diagrams
+24V max.
V
IN
Shutdown
Enable
C
IN
SHDN
Internal
Regulator
200kHz
Oscillator
Thermal
Shutdown
Current
Limit
Com-
parator
Driver
0.5A
Switch
1.23V
Bandgap
R1
R2
GND
SW
D1
L1
V
OUT
C
OUT
Error
Amp.
MIC4574-x.x
FB
4
Block Diagram with External Components
Fixed Step-Down Regulator
+24V max.
V
IN
Shutdown
Enable
C
IN
SHDN
Internal
Regulator
200kHz
Oscillator
Thermal
Shutdown
Current
Limit
V
OUT
V
REF
R1
+ 1
R2
1
R1
Com-
parator
Driver
0.5A
Switch
1.23V
Bandgap
R2
V
OUT
V
REF
SW
D1
L1
V
OUT
C
OUT
Error
Amp.
MIC4574
R1
FB
R2
[Adjustable]
GND
Block Diagram with External Components
Adjustable Step-Down Regulator
April 1998•
4-95