FAN5230 Datasheet, PDF (8/16 Pages) Fairchild Semiconductor – System Electronics Regulator for Mobile PCs

FAN5230
Vout
VFB12
CK :3
CK :3
V_e
Ramp
PWM
VREF=2.5V
R
Ramp
16R
–
+
V_e
FAN5230
12V Converter
CLK:3
(30%DC, 100kHz)
S
+
–
PWM
R
CLK:3
Q
Q
DISABLE
+5
SW12
V _out
Figure 2. FAN5230 12V Internal Block Diagram
3.3V ALWAYS
VIN
LDO
LDO
FAN5230
5V/3.3V-ALWAYS
5V ALWAYS
VFB5
Figure 3. FAN5230 5V/3.3V—ALWAYS Internal Block Diagram
8
REV. 2.8.5 10/17/01