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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)： | 11/16頁 |
| 文件大小： | 228K |
| 代理商： | LT1763-1.5 |
11
LT1763 Series
APPLICATIO
S I
FOR
ATIO
U
The LT1763 series are 500mA low dropout regulators with
micropower quiescent current and shutdown. The devices
are capable of supplying 500mA at a dropout voltage of
300mV. Output voltage noise can be lowered to 20
μ
V
RMS
over a 10Hz to 100kHz bandwidth with the addition of a
0.01
μ
F reference bypass capacitor. Additionally, the refer-
ence bypass capacitor will improve transient response of
the regulator, lowering the settling time for transient load
conditions. The low operating quiescent current (30
μ
A)
drops to less than 1
μ
A in shutdown. In addition to the low
quiescent current, the LT1763 regulators incorporate sev-
eral protection features which make them ideal for use in
battery-powered systems. The devices are protected
against both reverse input and reverse output voltages. In
battery backup applications where the output can be held
up by a backup battery when the input is pulled to ground,
the LT1763-X acts like it has a diode in series with its
output and prevents reverse current flow. Additionally, in
dual supply applications where the regulator load is re-
turned to a negative supply, the output can be pulled below
ground by as much as 20V and still allow the device to start
and operate.
W
U
U
Adjustable Operation
The adjustable version of the LT1763 has an output
voltage range of 1.22V to 20V. The output voltage is set by
the ratio of two external resistors as shown in Figure 2. The
device servos the output to maintain the ADJ pin voltage
at 1.22V referenced to ground. The current in R1 is then
equal to 1.22V/R1 and the current in R2 is the current in R1
plus the ADJ pin bias current. The ADJ pin bias current,
30nA at 25
°
C, flows through R2 into the ADJ pin. The
output voltage can be calculated using the formula in
Figure 2. The value of R1 should be no greater than 250k
to minimize errors in the output voltage caused by the ADJ
pin bias current. Note that in shutdown the output is turned
off and the divider current will be zero. Curves of ADJ Pin
Voltage vs Temperature and ADJ Pin Bias Current vs
Temperature appear in the Typical Performance Charac-
teristics section.
The adjustable device is tested and specified with the ADJ
pin tied to the OUT pin for an output voltage of 1.22V.
Specifications for output voltages greater than 1.22V will
PI
FU
CTIO
N
S
U
U
used for reducing output voltage noise to a typical 20
μ
V
RMS
over a 10Hz to 100kHz bandwidth. If not used, this pin
must be left unconnected.
GND (Pins 3, 6, 7):
Ground.
SHDN (Pin 5):
Shutdown. The SHDN pin is used to put the
LT1763 regulators into a low power shutdown state. The
output will be off when the SHDN pin is pulled low. The
SHDN pin can be driven either by 5V logic or open-
collector logic with a pull-up resistor. The pull-up resistor
is required to supply the pull-up current of the open-
collector gate, normally several microamperes, and the
SHDN pin current, typically 1
μ
A. If unused, the SHDN pin
must be connected to V
IN
. The device will be in the low
power shutdown state if the SHDN pin is not connected.
IN (Pin 8):
Input. Power is supplied to the device through
the IN pin. A bypass capacitor is required on this pin if the
device is more than six inches away from the main input
filter capacitor. In general, the output impedance of a
battery rises with frequency, so it is advisable to include a
bypass capacitor in battery-powered circuits. A bypass
capacitor in the range of 1
μ
F to 10
μ
F is sufficient. The
LT1763 regulators are designed to withstand reverse
voltages on the IN pin with respect to ground and the OUT
pin. In the case of a reverse input, which can happen if a
battery is plugged in backwards, the device will act as if
there is a diode in series with its input. There will be no
reverse current flow into the regulator and no reverse
voltage will appear at the load. The device will protect both
itself and the load.
Figure 2. Adjustable Operation
IN
1763 F02
R2
OUT
V
IN
V
OUT
ADJ
GND
LT1763
R1
+
V
V
R
R
I
R
V
I
ADJ
OUTPUT RANGE = 1.22V TO 20V
V
AT 25 C
nA
OUT
ADJ
ADJ
=
+
(
1
)( )
=
=
°
1 22
.
1
2
2
1 22
30
.
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| 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) |
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相關(guān)代理商/技術(shù)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(yīng)商設(shè)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 |
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