ISL78233 Datasheet, PDF (4/18 Pages) Intersil Corporation – 3A and 4A Compact Synchronous Buck Regulators

ISL78233, ISL78234
SS
SOSFoTft-
START
SHUTDOWN
COMP
55pF
100kΩ
FS SYNC
SHUTDOWN
VDD
EN
BANDGAP ^VREF
EAMP
-
FB
6kΩ
3pF
+
0.8V
-
+
SLSOloPpEe
COMP
OV
-
0.85*VREF
+ _UV
PG
SGND
1ms
DELAY
OSCILLATOR
+
COMP
-
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
HS DRIVER
+
OCP
-
+
SKIP
-
+
CSA
-
ISET
THRESHOLD
NEG CURRENT
SENSING
VIN
P
PHASE
LS
DRIVER
N
PGND
0.5V
-
SCP
+
ZERO-CROSS
SENSING
SHUTDOWN
100Ω
FIGURE 3. FUNCTIONAL BLOCK DIAGRAM
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4
FN8359.5
April 23, 2015