LTC3720_15 Datasheet, PDF (8/24 Pages) Linear Technology – Single Phase VRM8.5 Current Mode Step-Down Controller

LTC3720
W
FU CTIO AL DIAGRA
2 V_ON
R_ON
8 I_ON
5 FCB
0.7V
2.4V
1µA
1
OST
t_ON
=
V_VON
I_ION
(10pF)
20k
I_CMP
R
SQ
0.8V
–+
F
+
I_REV
–
1.4V
V_RNG
4
×
0.7V
3.3µA
1
240k
I_THB
1V
Q2 Q4
Q6
Q3 Q1
+– _0.8V
×4
EA
0.8V
Q5
SS
–+
0.6V
6 I_{TH RC} ^CC1
19 EXTV_CC
4.7V
+–
V_IN
20 V_IN
+
C_IN
0.8V
REF
5V
REG
FCNT
ON
SWITCH
LOGIC
SHDN
OV
BOOST
28
TG
27
SW
26
SENSE⁺
25
INTV_CC
21 ₊
BG
22
PGND
23
SENSE^–
24
PGOOD
3
C_B
M1
L1
D_B
C_VCC
+
M2
C_OUT
0.74V
UV
V_OSENSE
12
R2
10k ×5 (ALL VID PINS)
V_CC
40k
13 VID0
RUN
SHDN
OV
0.86V
1.2µA _6V
VID
DAC
R1
14 VID1
15 VID2
16 VID3
17 VID4
18 V_CC
0.6V ^{RUN/SS 1 CSS VFB 11 9 VFB}
SGND 10
7 SGND
3711 FD
3720f
8