DC1640A - Schematic

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REVISION HISTORY
ECO
REV
DESCRIPTION
APPROVED
DATE
-
2
PRODUCTION FAB
MIKE S.
9/27/10
E1
VO_SNS+
E2
VO_SNS-
INTVCC
A
VOUT
16
2
VOSNS+
TG
15
3
TRKSS
SW
14
BG
13
PGND
12
Q1
RJK0305DPB
R9
0
21
SGND
11
D1
CMDSH-3
*
R12
*
L1
Q4
OPT
1
2
3
4
DCR SENSE
FILTER /
DIVIDER
INTVCC
J3
COUT1
100uF
6.3V
1206
*
COUT2
100uF
6.3V
1206
+
COUT3
330uF
2.5V
7343
+
COUT4
330uF
2.5V
7343
VIN-
VOUT
1.5V / 20A
B
J4
GND
S-
ONLY APPLY LOAD
FROM J3 TO J4
R20
VOUT
J5
1
VOUT
EXTVCC
COUT5
OPT
1206
5
4
3
2
C10
OPT
PLLIN
MODE
1
2
3
COUT6
OPT
1206
2
R21
10K
E8
GND
VOUT
*
C9 2.2
0.1uF
16V
E7
180uF
16V
J2
E6
RS1
2512
R13
OPT
SVP-F8
VIN
4.5V - 14V
+ CIN4
R11
10
*
Q2
RJK0330DPB
4
C7
4.7uF
16V
0805
Q3
OPT
4
R10
10
S+
+ CIN3
SUD50N03-12P
LOAD STEP
J6
10mV / A
1
5% DUTY CYCLE MAX
CCM
DCM
JP2
E9
1
PULSE GEN
R22
10K
R23
0.01
2010
5
4
3
2
C
Q5
3
R18
137K
INTVCC
VIN
C8
OPT
FSW = 300kHz
RT
7
R19
OPT
JP1
*
6
10
R17
VRNG
MODE/PLLIN
*
470pF
ITH
5
9
1
2
3
ON
OFF
R15
EXTVCC
*
100pF
RUN
R16
OPT
RUN
C6
R14
B
4
8
VIN
0.01uF C5
4
C3
0.1uF
16V
C4
INTVCC
5
5
BOOST
R7
CIN2
22uF
16V
1210
CIN6
22uF
16V
1210
CIN5
OPT
1210
17
18
19
VOSNS-
1
2
3
1
5
R8
20K
CIN1
22uF
16V
1210
1
2
3
C2
OPT
VIN+
J1
1
2
3
R6
30.1K
C1
E3
VIN
S+
5
R5
OPT
*
PGOOD
0
R3
*
*
20
U1
LTC3833EUDC
R4
VOUT
E5
TRK/SS
R2
S-
SNS+
R1
100K
E4
PGOOD
SNS-
A
NOTES: UNLESS OTHERWISE SPECIFIED
C
E10
GND
1. ALL RESISTORS ARE IN OHMS, 0603.
ALL CAPACITORS ARE IN MICROFARADS, 0603.
LOAD STEP CIRCUIT
2. INSTALL SHUNTS ON JUMPERS AS SHOWN.
*
ASSY
-A (DCR SENSE)
-B (RSENSE)
L1
WURTH 744355047 (0.47uH)
COILTRONICS FP1308R3-R44-R (0.44uH)
C1
R7
R12
R13
R14
R17
R2,R3
RS1
R15
0.22uF
1000pF
2.15K
OPT
OPT
OPT
0
OPT
OPT
0
0
OPT
OPT
10
0.000 Ohm 2512, TEPRO RN5326
0.002 Ohm 2512, VISHAY WSL25122L000FEA
13.0K
16.5K
CUSTOMER NOTICE
D
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.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
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APPROVALS
TECHNOLOGY
PCB DES. NC
APP ENG.
MIKE S.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
HIGH EFFICIENCY STEP-DOWN DC-DC CONVERTER
SIZE
IC NO.
N/A
SCALE = NONE
DATE:
REV.
LTC3833EUDC
DEMO CIRCUIT 1640A-A/B
2
9/27/10
7
SHEET 1
8
OF
1
D
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