Linear Technology LTC1702, Demo Manual

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2
DEMO MANUAL DC275
DC/DC CONVERTER
PACKAGE A D SCHE ATIC DIAGRA S M
W U W
LTC1702
PV
CC
BOOST1 BG1 TG1 SW1 I
MAX1
PGOOD1 FCB RUN/SS1 COMP1 SGND FB1
I
MAX2
BOOST2
BG2 TG2
SW2
PGND
PGOOD2
FAULT
RUN/SS2
COMP2
FB2 V
CC
1 2 3 4 5 6 7 8 9
10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
C5
1
µ
F
R1
10
Ω
5%
C6
1
µ
F
C23 1
µ
F
R2 27k
R10 27k
R11 1.6k
R15 68k
DC175 F01
V
IN
R3
1.2k
R4 10k 1%
C12
180
µ
F
C13 820pF
C15 27pF
C14 680pF
R9 47k
C8 1
µ
F
E1
V
OUT1
1.6V, 1.8V,
2V OR 2.5V
AT 15A
C7 1
µ
F
R5 10k 1.6V 1%
R6 40.2k 1.8V 1%
R7 20k 2V 1%
R16 8.87k 2.5V 1%
BURST
JP4
CONT
Q2
Q1
Q4
Q3
D3
D2
NOTES: UNLESS OTHERWISE SPECIFIED D1, D2: ON SEMICONDUCTOR MBR0520LT1 D3, D4: ON SEMICONDUCTOR MBRS340T3 Q1 TO Q8: FAIRCHILD FDS6670A
D1
E2
PWRGD1
E3
SD1
E8
GND
L1
1
µ
H
+
C11 180
µ
F
C10
180
µ
F
+
C9 180
µ
F
+
C4
10
µ
F
C16 1
µ
F
C24
1
µ
F
C17 1
µ
F
C1 330
µ
F
+
C2
330
µ
F
+
C3 330
µ
F
+
Q7 Q5
Q8 Q6
D4
C18
680pF
C21
27pF
C22
3300pF
R12
15.8k
1%
R13
4.99k
1%
R14 10k
L2
1
µ
H
C19 180
µ
F
C20
1
µ
F
E4 V
OUT2
3.3V/15A E10 V
IN
E9 GND
E5 PWRGD2 E11 GND E6 FAULT E7 SD2
+
C25 180
µ
F
+
C26
180
µ
F
+
C27 180
µ
F
+
V
IN
JP1
R8 10k
JP2
V
IN
JP3
+
V
OUT1
JUMPER SELECT
JP1
OUT
IN
OUT OUT
1.6V 1.8V 2.0V 2.5V
JP2
OUT OUT
IN
OUT
JP3
OUT OUT OUT
IN
Figure 1. Dual 550kHz Synchronous 2-Phase 15A DC/DC Converter
LTC1702CGN
1 2 3 4 5 6 7 8 9
10 11 12
TOP VIEW
GN PACKAGE
24-LEAD NARROW PLASTIC SSOP
24 23 22 21 20 19 18 17 16 15 14 13
PV
CC
BOOST1
BG1
TG1
SW1
I
MAX1
PGOOD1
FCB
RUN/SS1
COMP1
SGND
FB1
I
MAX2
BOOST2 BG2 TG2 SW2 PGND PGOOD2 FAULT RUN/SS2 COMP2 FB2 V
CC