LTC1706-63
OPERATIO
In other words, each VID input has a typical pull-up current
of 68µA for a 3.3V system.
Besides the LTC1629-6, the LTC1706-63 also programs
a whole family of LTC DC/DC converters that have an
on-board 0.6V reference. The LTC3714, LTC3778 and
TYPICAL APPLICATIO
2-Phase 12V Input, 1.025V to 1.4125V/45A Max Power Supply (LTC3819)
with Adjustable Overvoltage Protection (LTC1706-63)
V
DD
_
CORE
+
V
CC
COMPARATOR
PWRGD
ENABLE
D1
BAT54
C1
0.1µF
RUN/SS
C3
1nF
LTC3819
1
2
3
4
5
R23 48.7k
CLK1
C9 4.7nF
R6 2.2k
C10 220pF
R24
107k
INTV
CC
C14 470pF
6
7
8
9
10
11
12
13
14
Q9 (OPT)
2N7002
VID0
VID1
VID2
VID3
VID4
C17
1nF
15
16
17
18
RUN/SS
SENSE1
+
SENSE1
EAIN
PLLFLTR
PLLIN
FCB
I
TH
SGND
V
DIFFOUT
V
OS
–
–
PGOOD
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
ATTENIN
V
BIAS
VID4
VID3
VID2
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
C18
0.1µF
R12 10Ω
INTV
CC
C11
2.2µF
D3
BAT54A
C12
10µF
C15
0.47µF
C7 1µF
V
OS+
SENSE2
–
SENSE2
+
ATTENOUT
NO_CPU
VID0
VID1
C
IN1
: SIX 10µF 16V CERAMIC CAPACITORS
C
OUT1
: TEN 22µF 6.3V CERAMIC CAPACITORS
L1, L2: SUMIDA CEP125-1R0MC-H
Q1, Q3: TWO Si7448DP IN PARALLEL
Q2, Q4: THREE Si7448DP IN PARALLEL
6
+
OVP
TO SYSTEM
OVERVOLTAGE
PROTECTION
–
U
U
LTC3731 are just a few of the high efficiency step-down
switching regulators that will work equally well with the
LTC1706-63. The LTC3819 is a VID controlled 2-phase
synchronous step-down controller with on-board
LTC1706-63.
LTC1706-63
SENSE
FB
OVP
THRESHOLD
LOGIC
VID0
VID1
VID2
VID3
VID4
FROM
µP
R1
10Ω
Q1
×2
C5
0.47µF
Q2
×3
C2
0.47µF
10Ω
L1
0.8µH
D2
B320A
12V
IN
C
IN1
10Ω
R5
0.002Ω
C8
0.47µF
V
DD
_
CORE
+
C
OUT1
R7
0.002Ω
R8
50Ω
C16
0.47µF
GND
R9
50Ω
COREFB_H
GND
+
Q3
×2
C13
0.47µF
L2
0.8µH
D4
B320A
+
Q4
×3
10Ω
10Ω
COREFB_L
1706-63 TA03
170663f
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
