XC9503 Series
2ch. Step-down DC/DC Controller ICs
Block Diagram
EXT1
PWM/PFM
Controller 1
PWM/PFM
Controller 2
EXT2
PWM
Comparator1
PWM
Comparator2
VDD
+
-
-
+
GND
FB1
+
-
Error Amp1 Ramp Wave
Generator 1
+
-
Ramp Wave Error Amp2
Generator 2
FB2
PWM1
OSC
Generator
Vref1 = 0.9V
with Soft Start1,
EN1
EN1 to
internal circuit
Vref2 = 0.9V
with Soft Start 1,
EN2
PWM2
EN1
EN2
EN2 to
internal circuit
Absolute Maximum Ratings
Ta=25
O
C
PARAMETER
V
DD
Pin Voltage
FB1, 2 Pin Voltage
EN1, 2 Pin Voltage
PWM1,2 Pin Voltage
EXT1, 2 Pin Voltage
EXT1, 2 Pin Current
Power Dissipation
Operating Ambient Temperature
Storage Temperature
SYMBOL
V
DD
V
FB
V
EN
V
PWM
V
EXT
I
EXT
Pd
Topr
Tstg
RATINGS
- 0.3 ~ 12
- 0.3 ~ 12
- 0.3 ~ 12
- 0.3 ~ 12
- 0.3 ~ V
DD
+ 0.3
±100
150
- 40 ~ + 85
UNITS
V
V
V
V
V
mA
mW
O
C
O
C
- 55 ~ +125
* Voltage goes to Ground.
3
TOREX [ TOREX SEMICONDUCTOR ]
