LTC3707 Datasheet, PDF (9/32 Pages) Linear Technology – High Effi ciency, 2-Phase Synchronous Step-Down Switching Regulator

FUNCTIONAL DIAGRAM
LTC3707
FREQSET
1.19V
1M
OSCILLATOR
CLK1
CLK2
PGOOD
V_SEC
3V
0.18μA
R6
FCB
R5
4.5V –
+
+
–
0.86V
V_FB
0.74V
BINH
FCB
3.3V_OUT
0.8V
V_REF
V_IN
EXTV_CC
INTV_CC
+^5V
SGND
4.8V +
–
STBYMD
5V
LDO
REG
INTERNAL
SUPPLY
DUPLICATE FOR SECOND
CONTROLLER CHANNEL
BOOST
DROP
OUT
DET
SQ
RQ
BOT FCB
TOP ON
TG
TOP
SW
SWITCH
LOGIC
INTV_CC
BG
BOT
0.55V
+B
–
SHDN
PGND
I1
I2
–
– ++ –
+
0.86V
3mV
4(V_FB)
SLOPE
COMP
45k
45k
2.4V
EA
OV
1.2μA
6V
SHDN
RST
4(V_FB)
RUN
SOFT-
START
INTV_CC
30k ^SENSE+
30k ^SENSE–
V_FB
0.80V
V_OSENSE
0.86V
I_TH
RUN/SS
INTV_CC
V_IN
D_B
C_B
+
D₁
C_IN
C_OUT
R_SENSE
D_SEC
C_SEC
R2
R1
C_C
C_C2
R_C
C_SS
V_OUT
3707 FD/F02
Figure 2
3707fb
9