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參數(shù)資料
| 型號： | LT3014 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 20mA, 3V to 80V Low Dropout Micropower Linear Regulator |
| 中文描述： | 20mA的，3V至80V的微功率低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 194K |
| 代理商： | LT3014 |
10
LT3014
3014fb
APPLICATIOU
The maximum junction temperature will then be equal to
the maximum junction temperature rise above ambient
plus the maximum ambient temperature or:
T
JMAX
= 50
°
C + 26
°
C = 76
°
C
Example 2: Given an output voltage of 5V, an input voltage
of 48V that rises to 72V for 5ms(max) out of every 100ms,
and a 5mA load that steps to 20mA for 50ms out of every
250ms, what is the junction temperature rise above ambi-
ent Using a 500ms period (well under the time constant
of the board), power dissipation is as follows:
P1(48V in, 5mA load) = 5mA (48V – 5V)
+ (100
μ
A 48V) = 0.22W
P2(48V in, 20mA load) = 20mA (48V – 5V)
W
U
U
+ (0.55mA 48V) = 0.89W
P3(72V in, 5mA load) = 5mA (72V – 5V)
+ (100
μ
A 72V) = 0.34W
P4(72V in, 20mA load) = 20mA (72V – 5V)
+ (0.55mA 72V) = 1.38W
Operation at the different power levels is as follows:
76% operation at P1, 19% for P2, 4% for P3, and
1% for P4.
P
EFF
= 76%(0.22W) + 19%(0.89W) + 4%(0.34W)
+ 1%(1.38W) = 0.36W
With a thermal resistance in the range of 40
°
C/W to
62
°
C/W, this translates to a junction temperature rise
above ambient of 20
°
C.
Protection Features
The LT3014 incorporates several protection features which
make it ideal for use in battery-powered circuits. In addi-
tion to the normal protection features associated with
monolithic regulators, such as current limiting and ther-
mal limiting, the device is protected against reverse-input
voltages, and reverse voltages from output to input.
Current limit protection and thermal overload protection
are intended to protect the device against current overload
conditions at the output of the device. For normal opera-
tion, the junction temperature should not exceed 125
°
C.
The input of the device will withstand reverse voltages of
80V. Current flow into the device will be limited to less than
6mA (typically less than 100
μ
A) and no negative voltage
will appear at the output. The device will protect both itself
and the load. This provides protection against batteries
which can be plugged in backward.
The ADJ pin can be pulled above or below ground by as
much as 7V without damaging the device. If the input is left
open circuit or grounded, the ADJ pin will act like an open
circuit when pulled below ground, and like a large resistor
(typically 100k) in series with a diode when pulled above
ground. If the input is powered by a voltage source, pulling
the ADJ pin below the reference voltage will cause the
device to current limit. This will cause the output to go to
an unregulated high voltage. Pulling the ADJ pin above the
reference voltage will turn off all output current.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3014B | 制造商:LINER 制造商全稱:Linear Technology 功能描述:20mA, 3V to 80V Low Dropout Micropower Linear Regulator |
| LT3014BEDD | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.22V to 60V 0.02A 8-Pin DFN EP |
| LT3014BEDD#PBF | 功能描述:IC REG LDO ADJ 20MA 8-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標準包裝:50 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:3.3V 輸入電壓:最高 15V 電壓 - 壓降（標準）:1.1V @ 800mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:800mA 電流 - 限制（最?。?800mA 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-4，D²Pak（3 引線+接片），TO-263AA 供應(yīng)商設(shè)備封裝:D2PAK-3 包裝:管件 |
| LT3014BEDD#PBF | 制造商:Linear Technology 功能描述:LDO ADJ 1.22V TO 60V 20mA DFN-8 制造商:Linear Technology 功能描述:LDO, ADJ, 1.22V TO 60V, 20mA, DFN-8 |
| LT3014BEDD#TR | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.22V to 60V 0.02A 8-Pin DFN EP T/R |
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