LTC3716 Datasheet, PDF (27/28 Pages) Linear Technology – 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator

LTC3716
TYPICAL APPLICATIO
Figure 13 shows a typical application using LTC3716 to
power the mobile CPU core. The input can vary from 7V to
24V, the output voltage can be programmed from 0.6V to
1.75V with a maximum current of 30A. This power supply
receives three input signals to generate different output
voltage offsets based on the operation conditions. With
the AMPMD pin of LTC3716 tied to INTV_CC, the LTC3716
provides a regular operational amplifier to implement
these offsets. When GMUXSEL is low, the output voltage
is offset –1.2% from the VID command voltage. The offset
equals Ra/Rb. When DPSLP# is low, the output voltage is
decreased by approximately 4%. This offset can be in-
creased by decreasing Rc and will be disabled when the
DPRSLPVR signal is high. The optional filtering circuit (Q1
and Q2) is used to mask the PWRGOOD during the VID
transitions.
3.3V
OPTIONAL
R2
PWRGOOD 10k
R3
10k
R4
10k
0.47µF
C1
R1
10Ω
Q1
1000pF
Q2 ^FMMT3906
FMMT3904
R8
R1
10k
10k
R5
10Ω
C1
1µF
R6
10Ω
C5
0.1µF
V_RON
1N4148
R10
3.9k
C7
0.01µF
R11
249k
1%
R15
75k, 1%
C9
1000pF C8 ^R17
330pF ^22k
C12
0.01µF
D3
BAT54A
INTV_CC
R29
100k
Q14
FMMT3904
R_b
845k
R_c
432k
Q13
2N7002
R30
10k
2N7002
R12 R13
1M 10k
R_d, 15.4k, 1%
C15
47pF
VID0
VID1
C18
1000pF
INTV_CC
LTC3716
1
36
RUN/SS PGOOD
2 _SENSE1+
35
TG1
3 _{SENSE1 –}
34
SW1
4
EAIN
33
BOOST1
5
PLLFLTR
6
PLLIN
32
V_IN
31
BG1
C6
0.47µF 3
D1
BAT54A
1
2
7
FCB
8
i_TH
9
SGND
30
EXTV_CC
5V (0PT)
29
INTV_CC
28
PGND
C11 ⁺
1µF
C10
10µF
6V
10
V_DIFFOUT
27
BG2
11
V_OS ^–
26
BOOST2
12
V_OS ⁺
25
SW2
13 _{SENSE2 –}
24
TG2
C13, 0.47µF
14 _{SENSE2+ AMPMD} 23
15
ATTENOUT
16
ATTENIN
17
VID0
18
VID1
22
V_BIAS
21
VID4
20
VID3
19
VID2
VID4
C16
0.1µF Rb
845k
VID3
Q12
2N7002
VID2
R23
10Ω
R24
10Ω
GMUXSEL
DPSLP#
DPRSLPVR
C_IN: FOUR CERAMIC CAPS (10µF/35V)
C_OUT: FOUR PANASONIC SP CAPS EEFUEOD271R (270µF/2V)
L1, L2: SUMIDA CEP125-1ROMC-H
2N7002
5678
4
Q3
IRF7811
123
5678
4
Q4
4
IRF7811
123
5678
4
Q9
IRF7811
123
5678
4
Q10 4
IRF7811
123
R_a 4.99k
C3
1µF
C_IN
5678
Q5
IRF7811
123
L1
1µH
R9
3 _0.003 4
1
2
D2
MBRS130LT3
V_IN
5V TO 22V
C14
1µF
5678
L2
1µH
R21
1 ^0.003 2
3
4+
Q11
IRF7811
123
D4
MBRS130LT3
1µF
C_OUT
V_OUT
GND
R25
10Ω
0Ω
10Ω
FB⁺
FB^–
3716 F13
Figure 13. 5V to 20V Input, 0.6V to 1.75V/30A IMVPII Compatible Power Supply with Active Voltage Positioning
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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