Diodes AP1635 - Manual (Page 3)

AP1635
PWM/PFM DUAL MODE STEP-DOWN DC/DC
CONVERTER
AP1635 Rev. 4 3 of 8 FEBRUARY 2009
www.diodes.com © Diodes Incorporated
Block Diagram
Phase
Compensation
Vref with
CE
+
-
PWM/PFM
Controller
+
-
Ramp Wave
Generator,
OSC
SW
CE/SS GND
PVcc
PWM
Comparator
FB
Current Limit
Soft
Start
ERR
AMP
SVcc
Absolute Maximum Ratings
(T
A
=25°C)
Symbol Parameter Ratings Units
V
CC
/SV
CC
V
IN
Pin Voltage -0.3 ~ 5.0 V
V
SW
SW Pin Voltage -0.3 ~ V
IN
+0.3 V
V
FB
FB Pin Voltage -0.3 ~ V
IN
+0.3 V
V
CE/SS
CE/SS Pin Voltage -0.3 ~ V
IN
+0.3 V
P D Continuous Total Power Dissipation Internal limited
T
OPR
Operating Ambient Temperature -25 ~ +80 °C
T
STG
Storage Temperature -40 ~ +125 °C