DC1270A - Schematic

5
4
3
2
1
REVISION HISTORY
ECO
-
D
VIN
2.7V TO 5.5V
GND
VINE1
APPROVED
DESCRIPTION
PRODUCTION
3
DATE
CHARLIE Z.
08/23/10
VIN+
E2
J2
J1
REV
D
CIN1
+
220uF
6.3V
+
CIN2
MODE
1
2
BURST
3
PS
220uF
6.3V
CIN3
R1
INTVCC
100K
+
CCM
(OPT)
CIN4
4
VIN
+
JP2
E3
PLLIN
(OPT)
R3
0 Ohm
R2
10
C1
C2
2.2uF
10V
7 0603
4.7uF
10V
C5
C3
100pF
0.1uF
R5
C
FREQ/PLLFLTR
1
400K
19
82.5K
1%
MODE/PLLIN C+
2
20
C16
3
EXTCLK
JP3
R7
C4
TG
SW
BOOST
VPUMP
VIN2
R9
23
5.90K
C8
2200pF
ITH
C9
150pF
INTVCC
21
RUN
BG
3
OFF
Q1
SiR438DP
NOTE:
1. WHEN RESISTOR SENSING IS IMPLEMENTED DO NOT
POPULATE R8 AND R15.
2. WHEN DCR SENSING IS IMPLEMENTED, SHORT RS1
AND DO NOT POPULATE R11 AND R12.
Q2
(OPT)
R13
22
C11
0.1uF
0 Ohm
18
R6
16
0 Ohm
R22
13
C7
4.7uF
10V
15 VIN2
C14
4.7uF
10V
14 INTVCC
0 Ohm
C6
0.1uF
R8
(OPT)
RS1
59PR9875N
Vitec
0.002
1%
J3
VOUT
1.5V / 15A
COUT1
100uF
6.3V
R15
(OPT)
COUT2
(OPT)
+
COUT3
COUT4
COUT5
COUT6
330uF + 330uF + (OPT) + (OPT)
4V
4V
J4
GND
D1
CMDSH-3
R23
R11
100
0 Ohm
R12
100
E7
VOUT-
R24
C15
4.7uF
10V
Q3
SiR438DP
0 Ohm
5
VIN
Q4
(OPT)
R10
R26
R16
R17
100K
100K
R25
0 Ohm
2
PGOOD
SENSE-
10
VIN2
(Opt)
B
VIN
E9
E10
VIN2
TRACK/SS
SENSE+
3
PGOOD
C
E4
VOUT+
L1
0.4uH
0 Ohm
TRACK
E8
CIN6
10uF
16V
1206
17
1
2
B
VIN1
0.01uF
E6
ON
C-
U1
LTC3852EUDD
RUN
JP1
RUN
12
FREQ/PLLFLTR
1000pF
1K
8
CIN5
10uF
16V
1206
SHDN
FB
GND1 GND GND2 NC NC
11
25
4
6
9
C12
1000pF
R14
(OPT)
R19
20K
1%
R20
17.4K
1%
1
24
C13
(OPT)
R21
0 Ohm
0805
CUSTOMER NOTICE
A
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
RB
5
4
3
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY
N/A
SCALE = NONE
2
A
CHARLIE Z. TITLE: SCHEMATIC
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
1630 McCarthy Blvd.
Milpitas, CA 95035 www.linear.com
Phone: (408)432-1900
Fax: (408)434-0507
DATE:
LOW VIN, HIGH EFFICIENCY STEP-DOWN
DC/DC CONVERTER
IC NO.
REV.
LTC3852EUDD
4
DEMO CIRCUIT 1270A
Thursday, October 21, 2010
SHEET
1
1
OF
1
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