LTC3851A_15 Datasheet, PDF (9/30 Pages) Linear Technology – Synchronous Step-Down Switching Regulator Controller

Functional Diagram
FREQ/PLLFLTR
MODE/PLLIN
100k
PLL-SYNC
MODE/SYNC
DETECT
0.8V
–+
5V REG
OSC
S
RQ
5k
–
I_CMP
I_REV
+
I_LIM
PULSE SKIP
BURSTEN
ON SWITCH
LOGIC
AND
ANTI-
SHOOT
THROUGH
RUN
OV
SLOPE COMPENSATION
LTC3851A
V_IN
+
V_IN
C_IN
BOOST
TG
C_B
SW
SENSE⁺
SENSE^–
INTV_CC
BG
C_VCC
GND
M1
D_B
L1
V_OUT
+
C_OUT
M2
INTV_CC
UVLO
1
100k
I_THB
V_IN
SLEEP
V_FB
R2
OV
R1
0.88V
0.8V
REF
–+
0.4V
– ^SS +
– ^RUN +
EA
1µA
0.64V
1.22V
I_TH
R_C
C_C1
RUN
TK/SS
C_SS
2µA
3851A FD
3851afa
9