LTC3619B_15 Datasheet, PDF (7/20 Pages) Linear Technology – 400mA/800mA Synchronous Step-Down DC/DC with Average Input Current Limit

Functional Diagram
REGULATOR 1
PGOOD1 8
0.654V
V_FB1
0.546V
V_{FB1 10}
–
I_TH
EA
+
0.6V
MIN
CLAMP
SLOPE
COMP
–
V_SLEEP +
SLEEP
–+
I_COMP
SOFT-START
S
Q
RS
LATCH
R
Q
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI
SHOOT-
THRU
LTC3619B
6 V_IN
+
I_COMP
–
7 SW1
SHUTDOWN
I_RCMP
RUN1 2
0.6V REF
OSC
RUN2 9
OSC
SLEEP2
SLEEP1
TO REGULATOR 2 ONLY
1V
V_{FB2 1}
–
– EA
+
0.6V
MIN
CLAMP
SLOPE
COMP
I_TH
–
SLEEP
V_SLEEP +
–+
I_COMP
PGOOD2 4
SOFT-START
0.654V
V_FB2
0.546V
S
Q
RS
LATCH
R
Q
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI
SHOOT-
THRU
REGULATOR 2
SHUTDOWN
I_RCMP
+
I_COMP
–
11 GND
3 RLIM
6 V_IN
5 SW2
11 GND
3619B FD
3619bfb
7