MIC4681 Datasheet, PDF (10/19 Pages) Micrel Semiconductor – 2A-Peak SuperSwitcher™ SOP-8 Buck Regulator

MIC4681
Block Diagrams
Micrel
SHDN
Internal
Regulator
200kHz
Oscillator
Thermal
Shutdown
Current
Limit
Com-
parator
Reset
Driver
Error
Amp
MIC4681 [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
3A
Switch
FB
V_OUT
C_OUT
R1
R2
Adjustable Regulator
MIC4681
10
February 2001