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LTC1435AI 데이터시트(PDF) 16 Page - Linear Technology

부품명 LTC1435AI
상세설명  High Efficiency Low Noise Synchronous Step-Down Switching Regulator
PDF  20 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC1435AI 데이터시트(HTML) 16 Page - Linear Technology

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LTC1435A
APPLICATIONS INFORMATION
4. Does the (+) plate of CIN connect to the drain of the
topside MOSFET(s) as closely as possible? This capaci-
tor provides the AC current to the MOSFET(s).
5. Is the INTVCC decoupling capacitor connected closely
betweenINTVCC and the power ground pin? This capaci-
tor carries the MOSFET driver peak currents.
6. Keep the switching node SW away from sensitive small-
signal nodes. Ideally the switch node should be placed
at the furthest point from the LTC1435A.
7. SGND should be exclusively used for grounding exter-
nal components on COSC, ITH, VOSENSE and SFB pins.
8. If operating close to the minimum on-time limit, is the
sense resistor oriented on the radial axis of the induc-
tor? See Figure 8.
COSC
TG
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC1435A
100pF
1000pF
CC1
CC2
RC
COSC
CSS
+
4.7
µF
DB
D1
CB
0.1
µF
CIN
M1
M2
L1
R1
R2
RSENSE
–
+
+
–
VOUT
VIN
1435A F10
BOLD LINES INDICATE
HIGH CURRENT PATHS
COUT
RUN/SS
ITH
SFB
SGND
VOSENSE
SENSE–
SENSE+
SW
VIN
INTVCC
BG
PGND
EXTVCC
BOOST
ITH
TG
1
2
3
5
6
10
11
15
12
14
16
13
78
COSC
43pF
CC
1000pF
CC2
220pF
50pF
RC
10k
CSS
0.1
µF
SENSE–
SENSE+
LTC1435A
1000pF
+
4.7
µF
CF
0.1
µF
DB
CMDSH-3
0.22
µF
M2
Si4410
D1
MBRS140T3
L1
3.3
µH
M1
Si4410
RSENSE
0.015
Ω
4.7
Ω
+
CIN
10
µF
30V
× 2
VIN
4.5V TO 22V
+
COUT
820
µF
4V
× 2
VOUT
1.3V TO 2.0V
7A
PGND
BG
COSC
VIN
VOSENSE
BOOST
1435A TA07
SGND
RUN/SS
SW
INTVCC
VID
0 1 2 3 GND
FROM
µP
SENSE
LTC1706-19
FB
3
6
4
2
1
8
7
5
VCC
Intel Mobile CPU VID Power Converter
Figure 10. LTC1435A Layout Diagram
TYPICAL APPLICATIONS



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