- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377713 > LT1763-1.5 (Linear Technology Corporation) 500mA, Low Noise, LDO Micropower Regulators(1.5V輸出，5000mA,低噪聲，低壓差穩(wěn)壓器) PDF資料下載
參數(shù)資料
| 型號： | LT1763-1.5 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 500mA, Low Noise, LDO Micropower Regulators(1.5V輸出，5000mA,低噪聲，低壓差穩(wěn)壓器) |
| 中文描述： | 500mA的，低噪聲，LDO的微功耗穩(wěn)壓器（1.5V的輸出，五零零零毫安，低噪聲，低壓差穩(wěn)壓器） |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 228K |
| 代理商： | LT1763-1.5 |
14
LT1763 Series
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Table 1. Measured Thermal Resistance
COPPER AREA
TOPSIDE*
BACKSIDE
2500mm
2
2500mm
2
1000mm
2
2500mm
2
225mm
2
2500mm
2
100mm
2
2500mm
2
50mm
2
2500mm
2
THERMAL RESISTANCE
(JUNCTION-TO-AMBIENT)
60
°
C/W
60
°
C/W
68
°
C/W
74
°
C/W
86
°
C/W
BOARD AREA
2500mm
2
2500mm
2
2500mm
2
2500mm
2
2500mm
2
*Device is mounted on topside.
Calculating Junction Temperature
Example: Given an output voltage of 3.3V, an input voltage
range of 4V to 6V, an output current range of 0mA to
250mA and a maximum ambient temperature of 50
°
C,
what will the maximum junction temperature be
The power dissipated by the device will be equal to:
I
OUT(MAX)
(V
IN(MAX)
– V
OUT
) + I
GND
(V
IN(MAX)
)
where,
I
OUT(MAX)
= 250mA
V
IN(MAX)
= 6V
I
GND
at (I
OUT
= 250mA, V
IN
= 6V) = 5mA
So,
P = 250mA(6V – 3.3V) + 5mA(6V) = 0.71W
The thermal resistance will be in the range of 60
°
C/W to
86
°
C/W depending on the copper area. So the junction
temperature rise above ambient will be approximately
equal to:
0.71W(75
°
C/W) = 53.3
°
C
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 + 53.3
°
C = 103.3
°
C
Protection Features
The LT1763 regulators incorporate several protection
features which make them ideal for use in battery-powered
circuits. In addition to the normal protection features
associated with monolithic regulators, such as current
limiting and thermal limiting, the devices are protected
against reverse input voltages, reverse output 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
20V. Current flow into the device will be limited to less than
1mA (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 output of the LT1763-X can be pulled below ground
without damaging the device. If the input is left open circuit
or grounded, the output can be pulled below ground by
20V. For fixed voltage versions, the output will act like a
large resistor, typically 500k
or higher, limiting current
flow to less than 100
μ
A. For adjustable versions, the
output will act like an open circuit; no current will flow out
of the pin. If the input is powered by a voltage source, the
output will source the short-circuit current of the device
and will protect itself by thermal limiting. In this case,
grounding the SHDN pin will turn off the device and stop
the output from sourcing the short-circuit current.
The ADJ pin of the adjustable device 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.
In situations where the ADJ pin is connected to a resistor
divider that would pull the ADJ pin above its 7V clamp
voltage if the output is pulled high, the ADJ pin input
current must be limited to less than 5mA. For example, a
resistor divider is used to provide a regulated 1.5V output
from the 1.22V reference when the output is forced to 20V.
The top resistor of the resistor divider must be chosen to
limit the current into the ADJ pin to less than 5mA when the
ADJ pin is at 7V. The 13V difference between output and
ADJ pin divided by the 5mA maximum current into the ADJ
pin yields a minimum top resistor value of 2.6k.
相關PDF資料 |
PDF描述 |
|---|---|
| LT1763-1.8 | 500mA, Low Noise, LDO Micropower Regulators(1.8V輸出，5000mA,低噪聲，低壓差穩(wěn)壓器) |
| LT1763-2.5 | 500mA, Low Noise, LDO Micropower Regulators(2.5V輸出，5000mA,低噪聲，低壓差穩(wěn)壓器) |
| LT1763-3 | 500mA, Low Noise, LDO Micropower Regulators(3V輸出，5000mA,低噪聲，低壓差穩(wěn)壓器) |
| LT1763-3.3 | 500mA, Low Noise, LDO Micropower Regulators(3.3V輸出，5000mA,低噪聲，低壓差穩(wěn)壓器) |
| LT1763-5 | 500mA, Low Noise, LDO Micropower Regulators(5V輸出，5000mA,低噪聲，低壓差穩(wěn)壓器) |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1763-3.3 | 制造商:Linear Technology 功能描述: |
| LT176333 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| LT1763CDE | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.22V to 20V 0.5A 12-Pin DFN EP |
| LT1763CDE#PBF | 功能描述:IC REG LDO ADJ .5A 12-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:1 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:8V 輸入電壓:10.5 V ~ 23 V 電壓 - 壓降（標準）:1.7V @ 40mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:100mA（最小值） 電流 - 限制（最?。?- 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SOIC 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:1075 (CN2011-ZH PDF) 其它名稱:296-24390-1 |
| LT1763CDE#TR | 制造商:Linear Technology 功能描述:SP-LINREG, 500mA L/Noise LDO uP |
發(fā)布緊急采購，3分鐘左右您將得到回復。