ISL6273 Datasheet, PDF (8/12 Pages) Intersil Corporation – 1.2A Low Quiescent Current 1.5MHz High Efficiency Synchronous Buck Regulator

Block Diagram
ISL6273
Shutdown
Soft
Start
25pF
400k
EN
Bandgap ^0.8V
EAMP
0.8pF
+
COMP
Oscillator
+
FB
Note 1
MODE
Shutdown
PW M/PFM
LOGIC
CONTROLLER
PROTECTION
DRIVER
VCC
5ΩΩ
POR
RSI
0.864V
+
+
0.736V
Slope
Comp
200ms
Delay
+
OCP
+
CSA1
1V
+
SKIP
0.2V
Zero -Cross
Sensing
PVIN
PHASE
PGND
SGND
0.2V
SCP
+
Note 1:
For adjustable output version, the internal feedback resistor divider is disabled and the FB pin is directly connected
to the error amplifier.
FIGURE 17. FUNCTIONAL BLOCK DIAGRAM
8
FN9256.0
March 7, 2006