Datasheet

Micrel, Inc. MIC4680
March 2008 8
M9999-032808
Functional Diagrams
SW
GND
FB
C
OUT
V
IN
IN
V
OUT
MIC4680-x.x
Internal
Regulator
SHDN
200kHz
Oscillator
Thermal
Shutdown
Reset
Current
Limit
Com-
parator
Error
Amp
1A
Switch
Driver
1.23V
Bandgap
Reference
Fixed Regulator
SW
FB
R1
R2
C
OUT
V
IN
IN
V
OUT
MIC4680 [adj.]
Internal
Regulator
SHDN
200kHz
Oscillator
Thermal
Shutdown
Reset
Current
Limit
Com-
parator
Error
Amp
1A
Switch
Driver
1.23V
Bandgap
Reference
VV
R1
R2
1
R1 R2
V
V
1
V 1.23V
OUT
REF
OUT
REF
REF
=+
⎛
⎝
⎜
⎞
⎠
⎟
=-
⎛
⎝
⎜
⎞
⎠
⎟
=
Adjustable Regulator