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參數(shù)資料
| 型號(hào)： | LT1501IS8-5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 1.3 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 190K |
| 代理商： | LT1501IS8-5 |
14
LT1500/LT1501
APPLICATIO
S I
FOR
ATIO
U
capacitors may require the capacitor to be larger. To
ensure proper reset of the soft start capacitor, an external
resistor must be connected in parallel with the capacitor.
The resistor value should be 470k or more.
W
U
U
Calculating Temperature Rise
For most applications, temperature rise in the IC will be
fairly low and will not be a problem. However, if load
currents are near the maximum allowed and ambient
temperatures are also high, a calculation should be done
to ensure that the maximum junction temperature of
100
°
C is not exceeded. The calculations must account for
power dissipation in the switch, the drive circuitry and the
sense resistor.
P
I
R
V
V
V
V
I
V
V
R
V
V
(
TOTAL
OUT
SW
OUT
)
)
+
OUT
IN
IN
OUT
OUT
30
IN
SENSE OUT
OUT
IN
=
(
) (
)(
(
)
(
)
+
(
)
2
2
2
2
·
)
P
TOTAL
= total device power dissipation
R
SW
= switch resistance (0.72
max)
R
SENSE
= sense resistance (0.42
max)
With V
IN
= –2.2V, V
OUT
= 5V, I
OUT
= 150mA, an 8-pin SO
package and maximum ambient temperature of 85
°
C
(industrial range),
P
W
TOTAL
=
(
) (
)
)
)
(
+
)
+
(
)
.
=
=
015
.
072 5 5 22
2
.
22
015 5 22
30
042 015 5
.
22
.
047 0014 0049
.
011
.
2
2
2
.
.
.
.
.
·
.
The SO package has a thermal resistance of 120
°
C/W, so
maximum device temperature will be:
T
JMAX
= 85
°
C + 0.11W(120
°
C/W) = 98
°
C
PACKAGE DESCRIPTIO
N
U
Dimensions in inches (millimeters) unless otherwise noted.
1
2
3
4
0.150 – 0.157**
(3.810 – 3.988)
8
7
6
5
0.189 – 0.197*
(4.801 – 5.004)
0.228 – 0.244
(5.791 – 6.197)
0.016 – 0.050
0.406 – 1.270
0.010 – 0.020
(0.254 – 0.508)
×
45
°
0
°
– 8
°
TYP
0.008 – 0.010
(0.203 – 0.254)
SO8 0695
0.053 – 0.069
(1.346 – 1.752)
0.014 – 0.019
(0.355 – 0.483)
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
*
**
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
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