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參數(shù)資料
| 型號： | LTC1709-8 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | CHOKE COIL 2.7UH 950MA SMD |
| 中文描述： | 2相，5位VID，電流模式，高效率同步降壓型開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 27/28頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LTC1709-8 |
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27
LTC1709-7
PACKAGE DESCRIPTIO
U
Dimensions in inches (millimeters) unless otherwise noted.
G36 SSOP 1098
0.13 – 0.22
(0.005 – 0.009)
0
°
– 8
°
0.55 – 0.95
(0.022 – 0.037)
5.20 – 5.38**
(0.205 – 0.212)
7.65 – 7.90
(0.301 – 0.311)
1
2
3
4
5
6
7
8
9 10 11 12
14 15 16 17 18
13
12.67 – 12.93*
(0.499 – 0.509)
25
26
22 21 20 19
23
24
27
28
29
30
31
32
33
34
35
36
1.73 – 1.99
(0.068 – 0.078)
0.05 – 0.21
(0.002 – 0.008)
0.65
(0.0256)
BSC
0.25 – 0.38
(0.010 – 0.015)
NOTE: DIMENSIONS ARE IN MILLIMETERS
DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.152mm (0.006") PER SIDE
DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.254mm (0.010") PER SIDE
*
**
G Package
36-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
An interesting result of the 2-phase solution is that the V
IN
which produces worst-case ripple current for the input
capacitor, V
OUT
= V
IN
/2, in the single phase design pro-
duces zero input current ripple in the 2-phase design.
The output ripple current is reduced significantly when
compared to the single phase solution using the same
inductance value because the V
OUT
/L discharge current
term from the stage that has its bottom MOSFET on
subtracts current from the (V
IN
– V
OUT
)/L charging current
resulting from the stage which has its top MOSFET on. The
output ripple current is:
I
V
fL
D
D
D
RIPPLE
OUT
=
(
)
+
2
1 2
1
1 2
1
where D is duty factor.
The input and output ripple frequency is increased by the
number of stages used, reducing the output capacity
requirements. When V
IN
is approximately equal to 2(V
OUT
)
as illustrated in Figures 3 and 4, very low input and output
ripple currents result.
APPLICATIU
W
U
U
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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| LTC1709EG7 | 制造商:Linear Technology 功能描述: |
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