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LM26480 Datasheet(PDF) 24 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM26480
Description  Externally Programmable Dual High-Current Step-Down DC/DC and Dual Linear Regulators
PDF  30 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM26480 Datasheet(HTML) 24 Page - National Semiconductor (TI)

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FEEDBACK RESISTORS FOR LDOs
30040410
Target V
OUT (V)
Ideal Resistor Values
Common R Values
Actual V
OUT W/
Com/R (V)
R1 (K
Ω)
R2 (K
Ω)
R1 (K
Ω)
R2 (K
Ω)
1
200
200
200
200
1
1.1
240
200
240
200
1.1
1.2
280
200
280
200
1.2
1.3
320
200
324
200
1.31
1.4
360
200
357
200
1.393
1.5
400
200
402
200
1.505
1.6
440
200
442
200
1.605
1.7
480
200
562
232
1.711
1.8
520
200
604
232
1.802
1.9
560
200
562
200
1.905
2
600
200
604
200
2.01
2.1
640
200
715
221
2.118
2.2
680
200
681
200
2.203
2.3
720
200
806
226
2.283
2.4
760
200
845
221
2.412
2.5
800
200
750
187
2.505
2.6
840
200
909
215
2.614
2.7
880
200
1100
249
2.709
2.8
920
200
1150
249
2.809
2.9
960
200
1210
255
2.873
3
1000
200
1000
200
3
3.1
1040
200
1000
191
3.118
3.2
1080
200
1000
187
3.174
3.3
1120
200
1210
215
3.314
3.4
1160
200
1210
210
3.381
3.5
1200
200
1210
200
3.525
The output voltages of the LDOs 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
OUT is: VOUT = VFB(R1+R2)/R2, where VFB is the voltage on
the LDOX_FB pin.
The LDO control loop will force the voltage on VFB to be 0.50
V ±3%. The above table shows ideal resistor values to es-
tablish LDO voltages from 1.0V to 3.5V along with common
resistor values to establish these voltages. Common resistors
do not always produce the target value, error is given in the
final column.
To keep the power consumed by the feedback network low it
is recommended that R2 be established as about 200 K
Ω.
Lesser values of R2 are OK at the users discretion..
www.national.com
24



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