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參數(shù)資料
| 型號(hào)： | LTC1700 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Quadruple 2-Input Exclusive-OR Gates 14-SO 0 to 70 |
| 中文描述： | 無檢測(cè)電阻同步升壓型DC / DC控制器 |
| 文件頁(yè)數(shù)： | 14/16頁(yè) |
| 文件大?。?/td> | 194K |
| 代理商： | LTC1700 |
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LTC1700
14
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
LTC1700. These items are illustrated graphically in the
layout diagram in Figure 8. Check the following in your
layout:
1. Are all the components connected close to the SW node
(Pin 10) The SW pin is the input to the V
DS
sense
amplifier and the current reverse comparator.
2. Connect the V
OUT
lead directly to the source of the
P-channel MOSFET. Besides supplying current to the
LTC1700, it also serves as the other input to the current
reverse comparator.
Figure 8. LTC1700 Layout Diagram (See PC Board Layout Checklist)
3. Connect the (+) plate of C2 to the source of the P-channel
MOSFET. This capacitor supports the load current when
the inductor is being “recharged”.
4. Connect the (–) plate of C2 to the source of the N-channel
MOSFET. Connect the power and signal ground to this
node.
5. Does the V
FB
pin connects directly to the feedback
resistors The resistive divider R1 and R2 must be con-
nected between the (+) plate of C2 and signal ground.
6. Keep the switching node SW away from sensitive small
signal nodes.
7. Switched currents flow in M1, M2 and C2, keep the loop
formed by these components as small as possible.
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Figure 7. Design Example Schematic
SGND
I
TH
V
FB
RUN/SS
SYNC/MODE
SW
PGND
BG
V
OUT
TG
LTC1700
1
2
3
4
5
10
9
8
7
6
+
L1
C1
C2
C4
C3
R3
M2
M1
V
IN
V
OUT
1700 F08
R1
R2
SGND
I
TH
RUN/SS
V
FB
SYNC/MODE
SW
BG
PGND
TG
V
OUT
LTC1700
1
2
4
3
5
10
8
9
6
7
+
L1
4.6
μ
H
C3
22
μ
F
C1
10
μ
F
C4
150
μ
F
6.3V
×
2
270pF
470pF
220pF
2.2k
95k
30k
M2
FDS6375
M1
FDS6670A
V
3.3V
V
5V/3A
1700 F07
+
C2
68
μ
F
6.3V
C1: TAIYO YUDEN CERAMIC JMK316BJ106ML
C2: AVX TAJB68K006R
C3: TAIYO YUDEN CERAMIC JMK325BJ226M
C4: SANYO POSCAP 6TPA150M
L1: SUMIDA CEP1234R6
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