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LTC3857IGN-1#PBF
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
P28-P30
P31-P33
P34-P36
P37-P38
L
TC3857-1
34
38571fc
High Efficiency Dual 1V/1.2V Step-Down Converter
SENSE1
+
SENSE1
–
SENSE2
–
SENSE2
+
V
FB1
I
TH1
SGND
EXT
V
CC
RUN1
RUN2
FREQ
TRACK/SS2
V
FB2
TRACK/SS1
PLLIN/MODE
PGOOD1
BG1
SW1
BOOST1
TG1
V
IN
INT
V
CC
PGND
TG2
BG2
BOOST2
SW2
C1
1nF
R
B1
28.7k
C
OUT1
, C
OUT2
: SANYO 2R5TPE220M
L1: SUMIDA CDEP105-3R2M
L2: SUMIDA CDEP105-7R2M
MTOP1, MTOP2: RENESAS RJK0305
MBOT1, MBOT2: RENESAS RJK0328
C
F1
56pF
C
ITH1A
220pF
C
SS1
0.01
µF
C
SS2
0.01
µF
C
ITH1
1000pF
C
INT
4.7µF
C
B1
0.47µF
C
B2
0.47µF
D1
V
IN
12V
D2
L
TC3857-1
L1
0.47µH
L2
0.47µH
R
SENSE1
3.5m
R
SENSE2
3.5m
MBOT1
MTOP2
MTOP1
MBOT2
38571 TA05
100k
INT
V
CC
C
OUT1
220µF
s
2
V
OUT1
1V
8A
V
OUT2
1.2V
8A
C
IN
22µF
C
OUT2
220µF
s
2
R
A1
115k
R
A2
115k
R
B2
57.6k
C
F2
56pF
R
FREQ
60k
R
ITH1
3.93k
C2
1nF
I
TH2
C
ITH2
1000pF
C
ITH2A
220pF
R
ITH2
3.43k
TYPICAL APPLICATIONS
L
TC3857-1
35
38571fc
High Efficiency Dual 1V/1.2V Step-Down Converter with Inductor DCR Current Sensing
SENSE1
+
SENSE1
–
SENSE2
–
SENSE2
+
V
FB1
I
TH1
SGND
EXT
V
CC
RUN1
RUN2
FREQ
TRACK/SS2
V
FB2
TRACK/SS1
PLLIN/MODE
PGOOD1
BG1
SW1
BOOST1
TG1
V
IN
INT
V
CC
PGND
TG2
BG2
BOOST2
SW2
C1
0.1
µF
R
B1
28.7k
C
OUT1
, C
OUT2
: SANYO 2R5TPE220M
L1, L2: SUMIDA IHL ERR47M06
MTOP1, MTOP2: RENESAS RJK0305
MBOT1, MBOT2: RENESAS RJK0328
C
F1
56pF
C
ITH1A
200pF
C
SS1
0.01
µF
C
SS2
0.01
µF
C
ITH1
1000pF
C
INT
4.7µF
C
B1
0.47µF
C
B2
0.47µF
D1
V
IN
12V
D2
L
TC3857-1
L1
0.47µH
L2
0.47µH
MBOT1
MTOP2
MTOP1
MBOT2
38571 TA06
100k
R
S1
1.18k
R
S2
1.18k
INT
V
CC
C
OUT1
220µF
s
2
V
OUT1
1V
8A
V
OUT2
1.2V
8A
C
IN
22µF
C
OUT2
220µF
s
2
R
A1
115k
R
A2
115k
R
B2
57.6k
C
F2
56pF
R
FREQ
65k
R
ITH1
3.93k
C2
0.1
µF
I
TH2
C
ITH2
1000pF
C
ITH2A
220pF
R
ITH2
3.43k
TYPICAL APPLICATIONS
L
TC3857-1
36
38571fc
GN Package
28-Lead Plastic SSOP (Narrow .150 Inch)
(Reference L
TC DWG # 05-08-1641)
.386 – .393*
(9.804 – 9.982)
GN28 (SSOP) 0204
12
3
4
5
6
7
8
9
10
11
12
.229 – .244
(5.817 – 6.198)
.150 – .157**
(3.810 – 3.988)
20
21
22
23
24
25
26
27
28
19
18
17
13
14
16
15
.016 – .050
(0.406 – 1.270)
.015
p
.004
(0.38
p
0.10)
s
45
o
0
o
– 8
o
TYP
.0075 – .0098
(0.19 – 0.25)
.0532 – .0688
(1.35 – 1.75)
.008 – .012
(0.203 – 0.305)
TYP
.004 – .0098
(0.102 – 0.249)
.0250
(0.635)
BSC
.033
(0.838)
REF
.254 MIN
RECOMMENDED SOLDER PAD LAYOUT
.150 – .165
.0250 BSC
.0165
p
.0015
.045
p
.005
*
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
INCHES
(MILLIMETERS)
NOTE:
1. CONTROLLING DIMENSION: INCHES
2. DIMENSIONS ARE IN
3. DRAWING NOT TO SCALE
PACKAGE DESCRIPTION
Please refer to
http://ww
w
.linear
.com/designtools/packaging/
for the most recent package drawings.
P1-P3
P4-P6
P7-P9
P10-P12
P13-P15
P16-P18
P19-P21
P22-P24
P25-P27
P28-P30
P31-P33
P34-P36
P37-P38
LTC3857IGN-1#PBF
Mfr. #:
Buy LTC3857IGN-1#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Low IQ, Dual, 2-Phase Synchronous Step Down Controller
Lifecycle:
New from this manufacturer.
Delivery:
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EMS
Payment:
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