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參數(shù)資料
| 型號： | LT1933 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 629K |
| 代理商： | LT1933 |
14
LT1933
1933f
V
IN
14.5V TO 36V
OFF ON
C3
0.1
μ
F
D3, 6V
D1
L1
47
μ
H
R2
10k
R1
86.6k
C1
10
μ
F
1933 TA02d
C2
2.2
μ
F
V
12V/450mA
D2
V
IN
BOOST
GND
FB
SHDN
SW
LT1933
5
4
1
6
2
3
V
IN
3.6V TO 20V
OFF ON
C3
0.1
μ
F
D2
L1
10
μ
H
R2
10k
R1
4.42k
C1
22
μ
F
2x
1933 TA02a
C2
2.2
μ
F
V
1.8V/500mA
V
IN
BOOST
GND
FB
SHDN
SW
LT1933
D1
5
4
1
6
2
3
V
IN
4.5V TO 36V
OFF ON
C3
0.1
μ
F
D2
L1
22
μ
H
R2
10k
R1
16.5k
C1
22
μ
F
6.3V
1933 TA02b
C2
2.2
μ
F
V
3.3V/500mA
V
IN
BOOST
GND
FB
SHDN
SW
LT1933
D1
5
4
1
6
2
3
V
IN
6.3V TO 36V
OFF ON
C3
0.1
μ
F
D2
L1
33
μ
H
R2
10k
R1
30.1k
C1
22
μ
F
6.3V
1933 TA02c
C2
2.2
μ
F
V
5V/500mA
V
IN
BOOST
GND
FB
SHDN
SW
LT1933
D1
5
4
1
6
2
3
12V Step-Down Converter
1.8V Step-Down Converter
3.3V Step-Down Converter
5V Step-Down Converter
should be placed on the same side of the circuit board, and
their connections should be made on that layer. Place a
local, unbroken ground plane below these components,
and tie this ground plane to system ground at one location,
ideally at the ground terminal of the output capacitor C1.
The SW and BOOST nodes should be as small as possible.
Finally, keep the FB node small so that the ground pin and
ground traces will shield it from the SW and BOOST nodes.
Include two vias near the GND pin of the LT1933 to help
remove heat from the LT1933 to the ground plane.
High Temperature Considerations
The die temperature of the LT1933 must be lower than the
maximum rating of 125
°
C. This is generally not a concern
unless the ambient temperature is above 85
°
C. For higher
temperatures, care should be taken in the layout of the
circuit to ensure good heat sinking of the LT1933. The
maximum load current should be derated as the ambient
temperature approaches 125
°
C.
The die temperature is calculated by multiplying the LT1933
power dissipation by the thermal resistance from junction
to ambient. Power dissipation within the LT1933 can be
estimated by calculating the total power loss from an
efficiency measurement and subtracting the catch diode
loss. The resulting temperature rise at full load is nearly
independent of input voltage. Thermal resistance depends
on the layout of the circuit board, but a value of 125
°
C/W
is typical.
Die temperature rise was measured on a two-layer, five by
five cm circuit board in still air. The LT1933 producing 5V
at 500mA showed a temperature rise of 28
°
C, allowing it
to deliver full load to 97
°
C ambient. Above this tempera-
ture the load current should be reduced. For 3.3V at
500mA the temperature rise is 24
°
C.
Other Linear Technology Publications
Application notes AN19, AN35 and AN44 contain more
detailed descriptions and design information for Buck
regulators and other switching regulators. The LT1376
data sheet has a more extensive discussion of output
ripple, loop compensation and stability testing. Design
Note DN100 shows how to generate a bipolar output
supply using a Buck regulator.
TYPICAL APPLICATIO S
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1934ES6-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1934IS6 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1934IS6-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1934-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1934 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1933_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:600mA, 500kHz Step-Down Switching Regulator in SOT-23 and DFN Packages |
| LT1933ES6 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 36V 6-Pin TSOT-23 |
| LT1933ES6#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR 6-TSOT-23 |
| LT1933ES6#TR | 功能描述:IC REG BUCK ADJ 0.6A TSOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LT1933ES6#TRM | 功能描述:IC REG BUCK ADJ 0.6A TSOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
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