參數(shù)資料
型號(hào)： LM26480QSQ-CF/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 2.4 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, QCC24
封裝： 4 X 4 MM, 0.80 MM HEIGHT, ROHS COMPLIANT, LLP-24
文件頁數(shù)： 14/30頁
文件大?。?/td> 2455K
代理商： LM26480QSQ-CF/NOPB
Application Notes
EXTERNAL COMPONENT SELECTION
30040410
Target
Vout (V)
Ideal Resistor Values
Common R Values
Actual VOUT
W/ Com/R (V)
Actual VOUT
Delta from
Target (V)
Feedback Capacitors
R1 (K
)
R2 (K
)
R1 (K
)
R2 (K
)
C1(pF)
C2(pF)
0.8
120
200
121
200
0.803
0.002
15
none
Buck1
0.9
160
200
162
200
0.905
0.005
15
none
Only
1
200
1
0
15
none
^
1.1
240
200
240
200
1.1
0
15
none
|
1.2
280
200
280
200
1.2
0
12
none
|
1.3
320
200
324
200
1.31
0.01
12
none
Buck1
1.4
360
200
357
200
1.393
-0.008
10
none
And
1.5
400
200
402
200
1.505
0.005
10
none
Buck2
1.6
440
200
442
200
1.605
0.005
8.2
none
|
1.7
427
178
432
178
1.713
0.013
8.2
none
|
1.8
463
178
464
178
1.803
0.003
8.2
none
|
1.9
498
178
499
178
1.902
0.002
8.2
none
|
2
450
150
453
150
2.01
0.01
8.2
none
>
2.1
480
150
475
150
2.083
-0.017
8.2
none
^
2.2
422
124
422
124
2.202
0.002
8.2
none
|
2.3
446
124
442
124
2.282
-0.018
8.2
none
|
2.4
471
124
475
124
2.415
0.015
8.2
none
|
2.5
400
100
402
100
2.51
0.01
8.2
none
|
2.6
420
100
422
100
2.61
0.01
8.2
none
|
2.7
440
100
442
100
2.71
0.01
8.2
33
Buck2
2.8
460
100
464
100
2.82
0.02
8.2
33
Only
2.9
480
100
475
100
2.875
-0.025
8.2
33
|
3
500
100
499
100
2.995
-0.005
6.8
33
|
3.1
520
100
523
100
3.115
0.015
6.8
33
|
3.2
540
100
536
100
3.18
-0.02
6.8
33
|
3.3
560
100
562
100
3.31
0.01
6.8
33
|
The output voltages of the bucks of the LM26480 are estab-
lished by the feedback resistor dividers R1 and R2 shown on
the application circuit above. The equation for determining V
is: V
OUT = VFB (R1+R2)/R2 where VFB is the voltage on the
Buck FBx pin.
The Buck control loop will force the voltage on V
FB to be 0.50
V ±3%.
The above table shows ideal resistor values to establish buck
voltages from 0.8V to 3.3 V along with common resistor val-
ues to establish these voltages. Common resistors do not
always produce the target value, error is given in the delta
column.
In addition to the resistor feedback, capacitor feedback C1 is
always required, and depending on the output voltage capac-
itor C2 is also required. See the application diagram below
and the above table for these requirements.
Inductor
Value
Unit
Description
Notes
L
SW1,2
2.2
H
SW1,2 inductor
D.C.R. 70 m
21
www.national.com
LM26480
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