ISL78228ARZ INTERSIL [Intersil Corporation], ISL78228ARZ Datasheet - Page 13

• Manufacturer Part Number: ISL78228ARZ
• Description: Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator
• Manufacturer: INTERSIL [Intersil Corporation]

Block Diagram
SGND
EN1
EN2
FB1
FB2
PG
1.6k
1.6k
SHUTDOWN
SHUTDOWN
BANDGAP
BANDGAP
VIN
1M
0.552V
0.552V
13
0.6V
0.6V
START
START
3pF
SOFT-
3pF
SOFT-
SLOPE
SLOPE
COMP
COMP
+
+
+
0.3V
+
0.3V
-
+
-
+
-
-
DELAY
EAMP
1ms
EAMP
+
PG1
-
+
-
SCP
SCP
PG2
+
+
27pF
200k
27pF
200k
+
+
COMP
-
-
COMP
OSCILLATOR
ISL78228
SHUTDOWN
THERMAL
SKIP
SKIP
OCP
OCP
+
+
-
+
+
-
-
-
CONTROLLER
PROTECTION
CONTROLLER
PROTECTION
PWM/PFM
PWM/PFM
DRIVER
DRIVER
LOGIC
LOGIC
SHUTDOWN
ZERO-CROSS
0.59V
0.09V
SHUTDOWN
0.59V
0.09V
ZERO-CROSS
SENSING
SHUTDOWN
SENSING
CSA1
CSA2
+
-
+
-
VIN
LX1
PGND
SYNC
VIN
LX2
PGND
May 2, 2011
FN7849.0