ISL78214 Datasheet, PDF (3/15 Pages) Intersil Corporation – 4A Low Quiescent Current High Efficiency Synchronous Buck Regulator

Typical Application
ISL78214
INPUT 2.8V TO 5.5V
C1
2 x 22µF
R1
100k
VIN
VDD
LX
PGND
L
1.5µH
OUTPUT
1.8V
C2
2 x 22µF
R2
124k
C3
47pF
ISL78214
EN
VFB
PG
R3
100k
SYNCH
SGND
FIGURE 1. TYPICAL APPLICATION DIAGRAM
Block Diagram
SYNCH
SOSoFfTt
START
SHUTDOWN
-
EN
BANDGAP ^0.8V _EAMP
-
3pF
27pF
390k
SHUTDOWN
OSCILLATOR
+
COMP
-
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
DRIVER
+
VFB
6k
SLSOloPpEe
COMP
PG
SGND
+
0.736V _-
1ms
DELAY
+
OCP
-
+
CSA
-
1.4V
+
SKIP
-
0.5V
ZERO-CROSS
SENSING
VIN
LX
PGND
-
SCP
0.2V
+
FIGURE 2. FUNCTIONAL BLOCK DIAGRAM
3
FN7551.0
March 8, 2010