DC1184A - Schematic

A
B
C
D
E
REVISION HISTORY
ECO
REV
-
4
5
VIN
RUN1
ON
R74
30.1K
1%
1
6
NOTE: UVL0 = 9V, Typical
APPROVED
DESCRIPTION
PRODUCTION
Value Change: R2A, R2B, R30, R26, R13, COUT17,
COUT22, C30 & C31. (FSwitch 400kHz to 500kHz)
Value Change: R74, R76, Q1, Q2, Q11 & Q12.
DATE
Mike Shriver
06/22/09
Mike S.
01/11/10
Mike S.
04/14/10
2
C1
1000pF
R75
10.0K
1%
R60
(Opt)
C4
1000pF
C2
1uF
25V
R77
10.0K
1%
R54
(Opt)
56
5
BOOT
54
8
9
10
11
12
13
14
15
16
17
18
19
20
58
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
59
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
0.47uH
744355147
Wurth Electronik
R11
2.87K
1%
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
GL
VLDRV
3
L1
ISNS2P
COMP2
PWM2
FB2
SGND
SGND
SGND
VINSNS
9
16
31
3. DO NOT CONNECT SCOPE GROUND TO E11.
VIN
4. USE E3 AND E11 TO MONITOR THE DC VOLTAGE OF
VOUT1. ONLY USE A BATTERY POWERED DMM.
R18
2.2
C12
1uF
25V
C13
1uF
25V
X5R
0603
CIN8
22uF
16V
CIN7
22uF
16V
5. USE E14 AND E20 TO MONITOR THE DC VOLTAGE
OF VOUT2 WITH ANY DMM.
2
R27
(Opt)
R29
(Opt)
Fswitch = 500kHz typical R30
55
R26
59.0K
1%
R25
0
40.2K
1%
C17
(Opt)
5
DISBL#
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
DRMDISBL2
56
PWM2
PWM
TP2
R32
(Opt)
E15
CLKOUT
2
53
R73
0
BOOT
54
Reg5V
VCIN
8
9
10
11
12
13
14
15
16
17
18
19
20
R20
(Opt)
VCC
NC
NC
C15
0.22uF
SW2
R31
2.87K
1%
0.47uH
744355147
Wurth Electronik
DRMBIAS2
R51
(Opt)
1. STUFF R16 WITH 0 OHMS.
2. STUFF R49 WITH 0 OHMS.
3. STUFF R20 WITH 0 OHMS.
4. REMOVE 0 OHM RESISTOR AT R25.
5. STUFF C16 WITH 100PF.
C18
4.7uF
10V
0805
6. STUFF R60 WITH 0 OHMS.
7. STUFF R57 WITH 0 OHMS.
8. REMOVE REDUNDANT COMPENSATION COMPONENTS.
9. TIE VOUT1 AND VOUT2 SHAPES TOGETHER.
R62
1.00K
1%
1. ALL RESISTORS ARE IN OHMS, 0603.
2. ALL CAPACITORS ARE IN MICROFARAD, 0603.
BODE PLOT SETUP:
B
U3
R2J20602NP
NOTE: UNLESS OTHERWISE SPECIFIED.
1. FOR VOUT1, APPLY EXCITATION SIGNAL ACROSS R6.
2. FOR VOUT2, APPLY EXCITATION SIGNAL ACROSS
R71 AND CHANGE ITS VALUE TO 10 OHMS.
A
COUT10
100uF
6.3V
COUT11
(Opt)
1210
+
E20
VO2-
COUT7
330uF
2.5V
7343
+
COUT8
330uF
2.5V
7343
+
J7
VOUT2+
1.8V / 25A
COUT9
330uF
2.5V
7343
J8
VOUT2-
VDRIVE
VOUT1
MODIFICATIONS FOR SINGLE OUTPUT / DUAL PHASE
OPERATION WHERE PHASE 1 = MASTER:
E14
VO2+
VOUT2
L2
59
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
GL
VLDRV
3
CGND
CGND
CGND
E19
GND
21
40
41
42
43
44
45
46
47
48
49
50
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
R34
(Opt)
TP4
52
(Opt)
R53
(Opt)
1
6
51
R33
CGND
VSWH
VCC
(Opt)
3
J5
VOUT1-
VIN
DRMBIAS2
0
C11
(Opt)
VCC
E28
DRMBIAS
J4
VOUT1+
1.2V / 25A
COUT3
+
330uF
2.5V
7343
VOS1-
VIN
R17
R23
10.0K
R28
(Opt)
COUT2
+
330uF
2.5V
7343
2. ONLY APPLY LOAD FROM J7 TO J8 ON VOUT2.
C14
0.1uF
C16
(Opt)
R50
COUT5
(Opt)
1210
C10
0.22uF
58
R19
(Opt)
COUT1
+
330uF
2.5V
7343
NOTE: 1. ONLY APPLY LOAD FROM J4 TO J5 ON VOUT1.
19
VCC
0
DRMBIAS1
COUT4
100uF
6.3V
20
0
1
R6
10
VOUT1
SW1
21
R71
R24
E12
TRK/SS2
E13
CLKIN
R3B
499
1%
C3B
2200pF
VOUT2
E3
VOS1+
VOS1+
U2
R2J20602NP
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VCC
CIN5
180uF
16V
16SVP180MX
C9
0.22uF
22
VIN
2
R1B
20K
1%
+
VOS1E11
PWMEN2
R21
10.0K
7
26
24
RUN1
PWMEN1
17
27
14
32
1
23
IL1M1
RUN2
PGOOD1
PGOOD2
SS1
VCC
VSNSP
100pF
RBB
10.0K
1%
CIN6
180uF
16V
(Opt)
C5
0.22uF
21
40
41
42
43
44
45
46
47
48
49
50
25
PWMEN2
R16
(Opt)
ISNS2N
ILIM2
8
33
29
30
6.34K
1% C2B 680pF
C8
4.7uF
10V
0805
15
7
ISNS1N
VSNSN
18
6
VSNSOUT
IAVG
VOS1+
ISNS1P
28
5
COMP1
PHSMD
VOS1-
C1B
R2B
VCC
VDIF1
4
13
R49
(Opt)
100pF
3
CLKOUT
R57
(Opt)
COMP1
12
6.34K
1% C2A 680pF
PWM1
FREQ
C1A
R2A
RBA
20K
1%
FB1
10
2
R61
(Opt)
+
R14
10
PWMEN1
U1
LTC3860EUH
COMP1
CIN4
(Opt)
1210
E2
VIN-
VDRIVE
1uF
CLKIN
R3A
499
1%
SS2
R1A
20K
1%
CIN3
(Opt)
1210
C7
11
R15
(Opt)
57
R13
59.0K
1%
VCC
C3A
2200pF
CGND
TP3
0
VCC
VSWH
C6
0.1uF
R12
(Opt)
R70
NC
NC
R52
(Opt)
R9
VDIF1
2
53
52
R10
(Opt)
PWM
TP1
R7
(Opt)
VCC
R8
(Opt)
0
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
VSWH
PWM1
VOUT2
E8
TRK/SS1
J1
VIN
10V - 14V
CIN1
22uF
16V
1210
R72
0
DISBL#
(Opt)
E5
PGOOD1
E4
PGOOD2
3
4
55
Reg5V
R5
VCC
R3
100K
DRMDISBL1
VCIN
DRMDISBL2
GH
R2
10.0K
VCC
R4
100K
CIN2
22uF
16V
1210
J2
GND
CGND
CGND
CGND
JP2
C3
1uF
25V
X5R
7
3
4
E1
VIN+
R1
2.2
DRMBIAS1
R76
30.1K
1%
1
2
OFF
VIN
GH
RUN2
ON
VIN
VIN
57
4
1
6
51
JP1
4
3
OFF
VOUT2
R63
1.00K
1%
1
CUSTOMER NOTICE
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APP ENG.
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
C
D
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
TITLE: SCHEMATIC
HIGH CURRENT DUAL OUTPUT/DUAL PHASE SYNCHRONOUS BUCK CONVERTER
SIZE
C:\ORCADWIN\CAPTURE\1184A\1184A_REV6.DSN
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
TECHNOLOGY
RB
Mike S.
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
DATE:
IC NO.
REV.
LTC3860EUH
DEMO CIRCUIT 1184A
Wednesday, April 14, 2010
E
SHEET
5
1
OF
2
A
B
C
D
E
OPTIONAL DISCRETE GATE DRIVER AND MOSFETS FOR PHASE 1
D5
CMDSH-3
Q1
RJK0305DPB
U4
LTC4449EDCB
VDRIVE
5
Q2
RJK0305DPB
4
4
C19
R35
2.2
C21
1uF
7
4.7uF
0805
PW M1
6
5
4
DYNAMIC LOAD CIRCUIT FOR VOUT1
VIN
VCC
BOOST
VLOGIC
TG
IN
TS
GND
BG
8
1
R64
C20
0
0.22uF
5
CIN9
22uF
16V
1210
4
1 2 3
CIN10
22uF
16V
1210
VOUT1
1 2 3
SW 1
5% DUTY CYLCE MAX.
Q6
RJK0330DPB
GND
5
COUT13
(Opt)
7343
+
COUT14
(Opt)
7343
+
COUT15
(Opt)
7343
COUT16
(Opt)
1210
COUT17
100uF
6.3V
1210
VOUT1
C30
4.7uF
10V
(Opt)
0805
4
5
4
9
Q4
SUD50N03-12P
E21
PULSE GEN1
2
3
+
J9
1 2 3
R37
10.0K
Q7
RJK0330DPB
4
1 2 3
JP5
ISTEP1
R39
0.010
1%
2010
E22
GND
GND
PULSED LOAD1 CURRENT
5% DUTY CYCLE MAX.
10mV / A
OPTIONAL DISCRETE GATE DRIVER AND MOSFETS FOR PHASE 2
D6
VIN
DYNAMIC LOAD CIRCUIT FOR VOUT2
CMDSH-3
3
Q11
RJK0305DPB
U5
LTC4449EDCB
VDRIVE
5
Q12
RJK0305DPB
4
5
CIN11
22uF
16V
1210
4
3
CIN12
22uF
16V
1210
VOUT2
C22
R40
2.2
7
4.7uF
C24
1uF
6
0805
PW M2
5
4
VCC
BOOST
VLOGIC
TG
IN
TS
GND
BG
8
1
R65
C23
0
0.22uF
1 2 3
SW 2
5% DUTY CYLCE MAX.
2
Q13
RJK0330DPB
3
GND
5
Q14
RJK0330DPB
4
1 2 3
+
Q9
SUD50N03-12P
E23
PULSE GEN2
5
4
9
J10
1 2 3
R41
10.0K
1 2 3
COUT18
(Opt)
7343
+
COUT19
(Opt)
7343
+
COUT20
(Opt)
7343
COUT21
(Opt)
1210
COUT22
100uF
6.3V
1210
VOUT2
C31
4.7uF
10V
(Opt)
0805
JP6
R44
0.010
1%
2010
E24
GND
ISTEP2
GND
PULSED LOAD2 CURRENT
5% DUTY CYCLE MAX.
10mV / A
2
2
5V BIAS
U6
LT1616ES6
VIN
JP3
INT 5V
ON
1
5
2
4
3
OFF
C26
1uF
2
VIN
PWM ENABLE CIRCUIT FOR
NON-THREE STATE
COMPATIBLE DRMOS
D3
BOOST
SHDN
SW
GND
FB
1
CMDSH-3
C25
0.22uF
15uH
A914BYW-150M
D4
B0530W-7-F
3
R45
6.65K
1%
JP4
+5V SELECT
1
INT
2
L3
6
R46
20K
1%
C27
10uF
10V
0805
3
DRMDISBL1
PW MEN1
R67
EXT
(Opt)
R66
(Opt)
VCC
1
VDRIVE
R47
C28
1uF
10
R48
1
E25
VDRIVE
DRMDISBL2
PW MEN2
0 C29
1uF
R69
E26
GND
(Opt)
R68
(Opt)
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
APPROVALS
PCB DES.
APP ENG.
Mike S.
A
B
C
D
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
TITLE: SCHEMATIC
HIGH CURRENT DUAL OUTPUT/DUAL PHASE SYNCHRONOUS BUCK CONVERTER
SIZE
C:\ORCADWIN\CAPTURE\1184A\1184A_REV6.DSN
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
TECHNOLOGY
RB
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
N/A
SCALE = NONE
DATE:
IC NO.
REV.
LTC3860EUH
DEMO CIRCUIT 1184A
Wednesday, April 14, 2010
E
6
SHEET
2
OF
2
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