LTC3709 Datasheet, PDF (9/24 Pages) Linear Technology – Fast 2-Phase, No RSENSE Synchronous DC/DC Controller with Tracking/Sequencing

W
FU CTIO AL DIAGRA
FCB
EXTLPF
CLOCK DETECTOR
FROM CHANNEL 2
TG
PLL2
INTLPF
PLL1
I_{ON RON}
V_CC
0.6V
REF
+
C_VCC
LTC3709
+
V_IN
C_IN
TO CHANNEL 2 OST
OST
t_ON
=
0.7
I_ION
(30pF)
R
Q
S
I_CMP
DUPLICATE FOR
SECOND CHANNEL
20k
+
I_REV
–
FCNT
ON
SWITCH
LOGIC
SHDN
OV
1.4V
V_RNG
0.7V
×
3.3µA
SHDN TO
CHANNEL 2
SWITCH LOGIC
OV
BOOST
TG
C_B
M1
SW
SENSE⁺
DRV_CC ^5V
L1
D_B
V_OUT
+
C_OUT
BG
PGND
C_DRVCC
M2
SENSE^–
0.66V
V_FB
R2
I_TH
C_C
R_C
1
240k
EA
Q4
SHED
UV
0.54V
R1
SGND
100µs
BLANKING
PGOOD
I_THB
TRACK
Q1 Q2
0.6V Q3
V_REF
RUN
SHDN
–+
1.4V
RUN/SS
+– _1.4V
1.2µA _6V
C_SS
40k
V_{OS+ 40k}
DISABLE
+
DIFFOUT
V_{OS– 40k}
–
40k
3709 FD
3709f
9