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參數(shù)資料
| 型號： | LTC1553CG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor |
| 中文描述： | 19 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-20 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 399K |
| 代理商： | LTC1553CG |
15
LTC1553
APPLICATIO
S I
FOR
ATIO
U
Table 5. Recommended MOSFETs for LTC1553 Applications
W
U
U
TYPICAL INPUT
CAPACITANCE
C
ISS
(pF)
3200
R
DS(ON)
AT 25
°
C (m
)
19
PARTS
Siliconix SUD50N03-10
TO-252
Siliconix Si4410DY
SO-8
Motorola MTD20N03HDL
D PAK
SGS-Thomson STD20N03L
D PAK
Motorola MTB75N03HDL
DD PAK
IRF IRL3103S
DD PAK
IRF IRLZ44
TO-220
Fuji 2SK1388
TO-220
RATED CURRENT (A)
15 at 25
°
C
10 at 75
°
C
10 at 25
°
C
8 at 75
°
C
20 at 25
°
C
16 at 100
°
C
20 at 25
°
C
14 at 100
°
C
75 at 25
°
C
59 at 100
°
C
56 at 25
°
C
40 at 100
°
C
50 at 25
°
C
36 at 100
°
C
35 at 25
°
C
θ
JC
(
°
C/W)
1.8
T
JMAX
(
°
C)
175
20
2700
—
150
35
880
1.67
150
23
2300
2.5
175
7.5
4025
1.0
150
14
1600
1.8
175
28
3300
1.0
175
37
1750
2.08
150
Inductor Selection
The inductor is often the largest component in the LTC1553
design and should be chosen carefully. Inductor value and
type should be chosen based on output slew rate require-
ments, output ripple requirements and expected peak
current. Inductor value is primarily controlled by the
required current slew rate. The maximum rate of rise of
current in the inductor is set by its value, the input-to-
output voltage differential and the maximum duty cycle of
the LTC1553. In a typical 5V input, 2.8V output applica-
tion, the maximum current slew rate will be:
(
DC
V
V
L
L
A
s
MAX
IN
OUT
)
=
1 83
μ
where L is the inductor value in
μ
H. With proper frequency
compensation, the combination of the inductor and output
capacitor will determine the transient recovery time. In
general, a smaller value inductor will improve transient
response at the expense of increased output ripple voltage
and inductor core saturation rating. A 2
μ
H inductor would
have a 0.9A/
μ
s rise time in this application, resulting in a
5.5
μ
s delay in responding to a 5A load current step. During
this 5.5
μ
s, the difference between the inductor current and
the output current must be made up by the output capaci-
tor, causing a temporary voltage droop at the output. To
minimize this effect, the inductor value should usually be
in the 1
μ
H to 5
μ
H range for most typical 5V input LTC1553
circuits. To optimize performance, different combinations
of input and output voltages and expected loads may
require different inductor values.
Once the required value is known, the inductor core type
can be chosen based on peak current and efficiency
requirements. Peak current in the inductor will be equal to
the maximum output load current plus half of the peak-to-
peak inductor ripple current. Ripple current is set by the
inductor value, the input and output voltage and the
operating frequency. The ripple current is approximately
equal to:
(
(
I
V
V
V
f
L
V
RIPPLE
IN
OUT
)( )( )
OUT
OSC
O
IN
=
)(
)
f
OSC
= LTC1553 oscillator frequency = 300kHz
L
O
= Inductor value
Note:
Please refer to the manufacturer’s data sheet for testing conditions
and detail information.
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