MIC4680 Datasheet, PDF (8/16 Pages) Micrel Semiconductor – 1A 200kHz SuperSwitcher™ Buck Regulator Final Information

MIC4680
Block Diagrams
Micrel
SHDN
Internal
Regulator
200kHz
Oscillator
Thermal
Shutdown
Current
Limit
V_IN
IN
Com-
parator
Reset
Driver
SW
1A
Switch
FB
Error
Amp
MIC4680-x.x
1.23V
Bandgap
Reference
GND
Fixed Regulator
V_OUT
C_OUT
SHDN
Internal
Regulator
200kHz
Oscillator
Thermal
Shutdown
Current
Limit
Com-
parator
Reset
Driver
Error
Amp
MIC4680 [adj.]
1.23V
Bandgap
Reference
V_IN
IN
V_OUT
=
V_REF

R1
R2
+ 1^{}
R1
=
R2


V_OUT
V_REF

− 1_
V_REF = 1.23V
SW
1A
Switch
FB
V_OUT
C_OUT
R1
R2
Adjustable Regulator
MIC4680
8
June 2000