ISL6531 Datasheet, PDF (3/17 Pages) Intersil Corporation – Dual 5V Synchronous Buck Pulse-Width Modulator (PWM) Controller for DDRAM Memory VDDQ and VTT Termination

Block Diagram
PGOOD
FB1
COMP1
SENSE1
VREF_IN
VREF
+
-
SENSE2
V2_SD
ISL6531
OCSET/SD
VCC
POWER-ON
RESET (POR)
40µA
+
-
OVER-
CURRENT
SOFT-
START
ERROR
AMP
+
-
PWM
COMPARATOR
+
-
INHIBIT
PWM
GATE
CONTROL
LOGIC
0.8V
REFERENCE
OSCILLATOR
ERROR
AMP
+
Z_f
-
Z_c
WINDOW
REGULATOR
90^o Phase
Shift
-
+
PWM
COMPARATOR
PWM
INHIBIT
GATE
CONTROL
LOGIC
VCC
GND
BOOT1
UGATE1
PHASE1
PVCC1
LGATE1
PGND1
BOOT2
UGATE2
PHASE2
LGATE2
PGND2
3