DC1626A - Schematic

5
4
3
PGOOD2
E2
INTVCC
VFB2
RUN2
RUN2
VRNG2
VRNG1
1
R3
OPT
ON
1
R4 OPT
3
R6
OPT
C1
OPT
ECO
REV
__
DESCRIPTION
2
APPROVED
PRODUCTION
MIKE S.
DATE
5-11-11
RUN2
RUN1
2
OFF
REVISION HISTORY
NOTE:
EXTERNALLY TIE THE
DTR1 PIN TO THE DTR2 PIN
IF THE TRANSIENT DETECT
CIRCUIT IS USED
R1 OPT
VIN
JP1
RUN2
2
OPTIONAL COMPONENTS FOR SINGLE
OUTPUT, DUAL PHASE OPERATION
E1
R7 OPT
D
D
E3
TRK/SS2
0
R9
4
TRK/SS2
INTVCC
INTVCC
R21
C7 220pF
*
6
VRNG2
7
R23
10K
R24
1
JP3
MODE
5
C6 47pF
R26
*
8
*
FCM
2
SYNC
9
3
C
10
DCM
4
11
FSW = 300kHz
R29
E8
R30
PLLIN
R28 137K
12
*
VRNG1
*
13
C11 47pF
R31
E9
CLKOUT
14
C12 330pF
*
15
VOUT2
TRK/SS1
16
C14 0.01uF
R37 TRK/SS1
OPT
R39 0
17
C15
OPT
R40
10K
R44
OPT
ON
R45
*
S1+
18
C16
* 19
TG2
TRACK/SS2
SW2
ITH2
BG2
VRNG2
DRVCC2
PHASEMD
EXTVCC
MODE/PLLIN
INTVCC
CLKOUT
PGND
SGND
VIN
RT
DRVCC1
VRNG1
BG1
ITH1
SW1
TRACK/SS1
TG1
VOUTSENSE1+
BOOST1
VOUTSENSE1-
PGOOD1
SENSE1+
RUN1
SENSE1-
S1-
DTR1
34
32
EXTVCC
31
4
R25
2.2
28
RJK0330DPB
Q4
4
RJK0305DPB
Q1
4
*
VO2+
J3
RS2
*
R20
2512
*
*
+ COUT6
COUT7
100uF
6.3V
1206
COUT8
100uF
6.3V
1206
330uF
2.5V
7343-D15T
+ COUT5
330uF
2.5V
7343-D15T
GND
VO2-
S1+
R32
C13
0.1uF
R38 100K
D1
L1
SW1
CMDSH-3
INTVCC
4
*
RJK0330DPB
Q2
4
*
OPT
Q6
R36
*
21
R48 0
R34
*
VOUT1
J5
RS1
*
2512
+ COUT2
COUT3
100uF
6.3V
1206
COUT4
100uF
6.3V
1206
330uF
2.5V
7343-D15T
330uF
2.5V
7343-D15T J6
GND
S1-
INTVCC
R42
10
DCR SENSE FILTER /
DIVIDER FOR PHASE 1
R43
10
R47
OPT
E11
VO1_SNS+
B
VO1_SNSC17
OPT
E14
OPTIONAL COUT
RUN1
VOUT1
J7
LOAD STEP
CIRCUIT #1
E15
1
VOUT2
5
4
3
2
EXTVCC
LOAD STEP
CIRCUIT #2
1
VOUT1
ONLY ADD FOOTPRINTS
ON SOLDERMASK, DO
NOT SHOW IN
SCHEMATIC.
VOUT2
J8
VOUT1
5
4
3
2
R50
OPT
3
VOUT1
1.2V / 15A
+ COUT1
E12
RUN1
PGOOD1
J4
E7
2
OFF
VOUT2
1.5V / 15A
CIN3
10uF
35V
1210
OPT
Q5
4
25
20
E6
VOUT2
R19
R27 2.2
26
22
VIN-
*
C
C10
0.1uF
R350
E5
DCR SENSE FILTER /
DIVIDER FOR PHASE 2
27
23
GND
OPT
Q8
C8
4.7uF
16V
0805
C9 INTVCC
1uF
24
J2
S2-
30
29
L2
SW2
33
CIN6
OPT
1210
S2+
R18
D2
CMDSH-3
CIN7
(OPT)
1210
1
2
3
C4
0.1uF
35
5
5
R160
CIN8
(OPT)
1210
CIN5
10uF
35V
1210
NOTE:
TIE SGND PIN TO PGND PAD UNDERNEATH IC.
R49
OPT
1
B
*
R46
10K
VIN
JP4
RUN1
R41
LTC3838EFE
39
E10
TRK/SS1
U1
VFB2
36
4
5
4
BOOST2
4
CIN4
10uF
35V
1210
OPT
Q7
VIN
4.5V - 26V
+
1
2
3
S2+
C5 0.01uF
SENSE2+
RJK0305DPB
Q3
5
3
PGOOD2
R12
100K
37
CIN1
100uF
100uF
35V
35V
35HV100M
35HV100M
+CIN2
1
2
3
*
SENSE2-
38
5
*
RUN2
1
2
3
60 DEG
C3
DTR2
1
2
3
R15
R17
10K
2
5
*
1
2
3
S2-
R14
5
1
R13
15K VFB2
2
3
J1
INTVCC
1
90 DEG
VIN
R55 0
C2
OPT
120 DEG
VIN+
INTVCC
1
2
3
JP2
PHASMD
CLKOUT
R11 0
5
R10
OPT
INTVCC
OPT
1
2
3
R8
PGND
E4
TRK/SS2
E19
LOAD STEP
10mV / A
5% DUTY CYCLE MAX
C18
1uF
Q9
SUD50N03-12P
1
E17
LOAD STEP
10mV / A
5% DUTY CYCLE MAX
2
EXTVCC
2
E16
Q10
SUD50N03-12P
1
PULSE1
+ COUT13
E18
OPT
7343-D15T
PULSE2
+ COUT14
OPT
7343-D15T
R51
10K
E22
IOSTEP1+
NOTES: UNLESS OTHERWISE SPECIFIED
A
R53
0.01
2010
E23
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
IOSTEP1-
3
3
GND
E20
GND
R52
10K
E24
IOSTEP2+
VOUT2
E21
GND
+
R54
0.01
2010
E25
IOSTEP2-
COUT15
OPT
7343-D15T
+ COUT16
OPT
7343-D15T
2. INSTALL SHUNTS ON JUMPERS AS SHOWN.
ASSY
-A (DCR SENSE)
-B (RSENSE)
L1,L2
Vishay IHLP4040DZ-01 0.56uH
WURTH 7443330068(0.68uH)
A
C16, C3
R32, R18
0.1uF
1000pF
4.02K
OPT
R34,R19
11K
OPT
R36,R20
R41,R45,
R14,R15,
0
OPT
OPT
10
CUSTOMER NOTICE
RS1, RS2
0.000 Ohm 2512
0.0025 Ohm 2512
R29,R24 R30,R26
OPT
0
0
OPT
R31
R21
17.4K
20K
40.2K
45.3K
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.
TECHNOLOGY
HZ
MIKE S.
TITLE: SCHEMATIC
WIDE INPUT RANGE, HIGH EFFICIENCY DUAL STEP-DOWN DC-DC CONVERTER
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
2
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
IC NO.
REV.
LTC3838EFE
2
DEMO CIRCUIT 1626A
Wednesday, October 19, 2011
1
SHEET 1
OF 1
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