參數(shù)資料
型號(hào)： LT3092MPST#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 249K
描述： IC PROG CURRENT SOURCE SOT223-3
標(biāo)準(zhǔn)包裝： 2,000
功能： 電流源
精確度： ±1%
輸入電壓： 1.2 V ~ 40 V
電流 - 輸出： 200mA
工作溫度： -55°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： TO-261-4，TO-261AA
供應(yīng)商設(shè)備封裝： SOT-223-3
包裝： 帶卷 (TR)
LT3092
14
3092fb
Demo circuit 1531As board layout using multiple inner
V
OUT
 planes and multiple thermal vias achieves 28癈/W
performance for the DFN package.
Table 2. DD Package, 8-Lead DFN
COPPER AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
TOPSIDE*    BACKSIDE    BOARD AREA
2500mm
2
2500mm
2
2500mm
2
25癈/W
1000mm
2
2500mm
2
2500mm
2
25癈/W
225mm
2
2500mm
2
2500mm
2
28癈/W
100mm
2
2500mm
2
2500mm
2
32癈/W
*Device is mounted on topside
Table 3. TS8 Package, 8-Lead SOT-23
COPPER AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
TOPSIDE*    BACKSIDE    BOARD AREA
2500mm
2
2500mm
2
2500mm
2
54癈/W
1000mm
2
2500mm
2
2500mm
2
54癈/W
225mm
2
2500mm
2
2500mm
2
57癈/W
100mm
2
2500mm
2
2500mm
2
63癈/W
*Device is mounted on topside
Table 4. ST Package, 3-Lead SOT-223
COPPER AREA
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
TOPSIDE*    BACKSIDE    BOARD AREA
2500mm
2
2500mm
2
2500mm
2
20癈/W
1000mm
2
2500mm
2
2500mm
2
20癈/W
225mm
2
2500mm
2
2500mm
2
24癈/W
100mm
2
2500mm
2
2500mm
2
29癈/W
*Device is mounted on topside
For further information on thermal resistance and using thermal information,
refer to JEDEC standard JESD51, notably JESD51-12.
Calculating Junction Temperature
Example: Given an industrial factory application with an
input voltage of 15V ?0%, an output voltage of 12V ?%,
an output current of 200mA and a maximum ambient
temperature of 50癈, what would be the maximum junc-
tion temperature for a DFN package?
The total circuit power equals:
   P
TOTAL
 = (V
IN
  V
OUT
)(I
OUT
)
The SET pin current is negligible and can be ignored.
V
IN(MAX CONTINUOUS)
 = 16.5 (15V + 10%)
V
OUT(MIN CONTINUOUS)
 = 11.4V (12V  5%)
I
OUT
 = 200mA
Power dissipation under these conditions equals:
   P
TOTAL
 = (16.5  11.4V)(200mA) = 1.02W
Junction temperature equals:
   T
J
 = T
A
 + P
TOTAL
 " ?/DIV>
JA
   T
J
 = 50癈 + (1.02W " 30癈/W) = 80.6癈
In this example, the junction temperature is below the
maximum rating, ensuring reliable operation.
Protection Features
The LT3092 incorporates several protection features ideal
for battery-powered circuits, among other applications.
In addition to normal circuit protection features such as
current limiting and thermal limiting, the LT3092 protects
itself against reverse-input voltages, reverse-output volt-
ages, and reverse OUT-to-SET pin voltages.
Current limit protection and thermal overload protection
protect the IC against output current overload condi-
tions. For normal operation, do not exceed a junction
temperature of 125癈. The thermal shutdown circuits
typical temperature threshold is 165癈 and has about
5癈 of hysteresis.
The LT3092s IN pin withstands ?0V voltages with respect
to the SET and OUT pins. Reverse-current  ow, if OUT is
greater than IN, is less than 1mA (typically under 100糀),
protecting the LT3092 and sensitive loads.
Clamping diodes and 1k limiting resistors protect the
LT3092s SET pin relative to the OUT pin voltage. These
protection components typically only carry current under
transient overload conditions. These devices are sized to
handle ?0V differential voltages and ?5mA crosspin
current  ow without concern.
 APPLICATIONS INFORMATION
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