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參數(shù)資料
| 型號： | LT1761-3 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 100mA, Low Noise, LDO Micropower Regulators in SOT-23(3V輸出，100mA,低噪聲，低壓差穩(wěn)壓器（SOT-23封裝）) |
| 中文描述： | 100mA的，低噪聲，LDO穩(wěn)壓器采用SOT微功耗穩(wěn)壓- 23（3V的輸出，100mA的，低噪聲，低壓差穩(wěn)壓器（采用SOT - 23封裝）） |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 197K |
| 代理商： | LT1761-3 |
15
LT1761 Series
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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 LT1761-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 typically 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.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to
ground, pulled to some intermediate voltage or is left open
circuit. Current flow back into the output will follow the
curve shown in Figure 6.
When the IN pin of the LT1761-X is forced below the OUT
pin or the OUT pin is pulled above the IN pin, input current
will typically drop to less than 2
μ
A. This can happen if the
input of the device is connected to a discharged (low
voltage) battery and the output is held up by either a
backup battery or a second regulator circuit. The state of
the SHDN pin will have no effect on the reverse output
current when the output is pulled above the input.
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Figure 6. Reverse Output Current
OUTPUT VOLTAGE (V)
100
90
80
70
60
50
40
30
20
10
0
R
μ
A
1761 F06
0
1
2
3
4
5
6
7
8
9
10
T
J
= 25
°
C
V
= 0V
CURRENT FLOWS
INTO OUTPUT PIN
V
= V
(LT1761-BYP, -SD)
LT1761-BYP
LT1761-SD
LT1761-2
LT1761-2.5
LT1761-3
LT1761-3.3
LT1761-5
LT1761-1.8
相關PDF資料 |
PDF描述 |
|---|---|
| LT1761-3.3 | 100mA, Low Noise, LDO Micropower Regulators in SOT-23(3.3V輸出，100mA,低噪聲，低壓差穩(wěn)壓器（SOT-23封裝）) |
| LT1761-5 | 100mA, Low Noise, LDO Micropower Regulators in SOT-23(5V輸出，100mA,低噪聲，低壓差穩(wěn)壓器（SOT-23封裝）) |
| LT1886 | Dual 700MHz, 200mA Operational Amplifier |
| LT1886CS8 | Dual 700MHz, 200mA Operational Amplifier |
| LT1941EFE | Triple Monolithic Switching Regulator |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1761CS5-2.5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LT1761CS5-3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LT1761CS5-3.3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LT1761CS5-5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| LT1761CS5-BYP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Adjustable Voltage Regulator |
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