ISL78214_15 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
LX
VDD
EN
PGND
ISL78214
VFB
PG
L
1.5µH
OUTPUT
1.8V
C₂
2 x 22µF
R₂
124k
C₃
47pF
R₃
100k
SYNCH
SGND
FIGURE 1. TYPICAL APPLICATION DIAGRAM
Block Diagram
SYNCH
SSOoFfTt
START
SHUTDOWN
-
EN
BANDGAP ^0.8V _EAMP
-
3pF
27pF
390k
OSCILLATOR
+
COMP
-
+
SHUTDOWN
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
0.2V
-
SCP
+
FIGURE 2. FUNCTIONAL BLOCK DIAGRAM
VIN
LX
PGND
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FN7551.3
May 12, 2015