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MIC4576
Block Diagrams
Micrel
+36V max.
VIN
CIN
Shutdown
Enable
SHDN
Internal
Regulator
200kHz
Oscillator
Thermal
Shutdown
Current
Limit
Com-
parator
Error
Amp.
MIC4576-x.x
Driver
3A
Switch
1.23V
Bandgap
R1
R2
GND
SW
L1
D1
FB
Block Diagram with External Components
Fixed Step-Down Regulator
VOUT
COUT
+36V max.
VIN
Shutdown
Enable
SHDN
Internal
Regulator
200kHz
Oscillator
Thermal
Shutdown
Current
Limit
Com-
parator
Error
Amp.
MIC4576 [Adjustable]
Driver
1.23V
Bandgap
3A
Switch
GND
CIN
VOUT
VREF
R1
R2
+1
R1 R2 VOUT 1
VREF
SW
L1
D1
VOUT
COUT
R1
FB
R2
Block Diagram with External Components
Adjustable Step-Down Regulator
December 2001
5
MIC4576