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參數(shù)資料
| 型號(hào)： | LT1965IDDTRPBF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.1A, Low Noise, Low Dropout Linear Regulator |
| 中文描述： | 1.1A的，低噪聲，低壓差線性穩(wěn)壓器 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 213K |
| 代理商： | LT1965IDDTRPBF |
LT1965
8
1965f
APPLICATIONS INFORMATION
The LT1965 is a 1.1A low dropout regulator with shut-
down. The device is capable of supplying 1.1A at a typical
dropout voltage of 290mV. The low operating quiescent
current (500μA) drops to less than 1μA in shutdown. In
addition to its low quiescent current, the LT1965 regulator
incorporates several protection features that make it ideal
for use in battery-powered systems. The device protects
itself against both reverse input and reverse output volt-
ages. In battery backup applications, if a backup battery
holds up the output when the input is pulled to ground,
the LT1965 performs like it has a diode in series with its
output, preventing reverse current flow. Also, in dual sup-
ply applications where the regulator load is returned to a
negative supply, the output can be pulled below ground
by as much as 20V. The LT1965 still starts and operates
normally in this situation.
Adjustable Operation
The LT1965 has an output voltage range of 1.20V to 20V.
Figure 1 illustrates that the ratio of two external resistors
sets the output voltage. The device servos the output to
maintain the ADJ pin voltage at 1.20V referenced to ground.
R1’s current equals 1.20V/R1. R2’s current equals R1’s
current plus the ADJ pin bias current. The ADJ pin bias
current, 1.3μA at 25°C, flows through R2 into the ADJ pin.
Use the formula in Figure 1 to calculate output voltage.
Linear Technology recommends that R1’s value be less
than 12.1k to minimize output voltage errors due to the
ADJ pin bias current. In shutdown, the output turns off
and the divider current is zero. For curves depicting ADJ
Pin Voltage vs Temperature and ADJ Pin Bias Current vs
Temperature, see the Typical Performance Characteristics
section.
The adjustable device is tested and specified with the ADJ
pin tied to the OUT pin for an output voltage of 1.20V.
Specifications for output voltages greater than 1.20V are
proportional to the ratio of the desired output voltage to
1.20V: V
OUT
/1.20V. For example, load regulation for an
output current change of 1mA to 1.1A is typically –4.25mV
at V
OUT
= 1.20V. At V
OUT
= 5V, load regulation is:
5
1 20
V
.
17 71
.
V
mV
mV
–4 25
–
=
Output Capacitance
The LT1965’s design is stable with a wide range of out-
put capacitors. The ESR of the output capacitor affects
stability, most notably with small capacitors. A minimum
output capacitor of 10μF with an ESR of 3
Ω
or less is
recommended to prevent oscillations. The LT1965 is a
low quiescent current device and output load transient
response is a function of output capacitance. Larger values
of output capacitance decrease the peak deviations and
provide improved transient response for larger current
changes.
Ceramic capacitors require extra consideration. Manufac-
turers make ceramic capacitors with a variety of dielectrics,
each with different behavior across temperature and applied
voltage. The most common dielectrics used are specified
with EIA temperature characteristic codes of Z5U, Y5V,
X5R and X7R. The Z5U and Y5V dielectrics provide high
C-V products in a small package at low cost, but exhibit
strong voltage and temperature coefficients as shown in
Figures 2 and 3. When used with a 5V regulator, a 16V
10μF Y5V capacitor can exhibit an effective value as low
as 1μF to 2μF for the DC bias applied and over the operat-
ing temperature range. The X5R and X7R dielectrics yield
much more stable characteristics and are more suitable
for use as the output capacitor. The X7R type works over
a wider temperature range and has better temperature
stability whereas X5R is less expensive and is available in
higher values. Care still must be exercised when using X5R
and X7R capacitors; the X5R and X7R codes only specify
operating temperature range and maximum capacitance
change over temperature. Capacitance change due to DC
bias with X5R and X7R capacitors is better than Y5V and
Z5U capacitors, but can still be significant enough to drop
Figure 1. Adjustable Operation
IN
1965 F01
R2
OUT
V
IN
V
OUT
ADJ
GND
LT1965
R1
+
V
V
R
R
I
R
V
I
AD
OUTPUTRANGE
V
OUT
ADJ
ADJ
=
+
+
1
=
1 20
.
1
2
2
1 20
.
μA AT
1 3
.
J
C
.
V TO
V
=
=
25
1 20
19 5
o
.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1965IDD-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.1A, Low Noise, Low Dropout Linear Regulator |
| LT1965IMS8E#PBF | 功能描述:IC REG LDO ADJ 1.1A 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(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(biāo)準(zhǔn)）: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 |
| LT1965IMS8E#PBF | 制造商:Linear Technology 功能描述:IC VOLT REGULATOR ADJUSTABLE +1.2 TO |
| LT1965IMS8E#TRPBF | 功能描述:IC REG LDO ADJ 1.1A 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:800 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.5V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.7V @ 4A 穩(wěn)壓器數(shù)量:1 電流 - 輸出:4A 電流 - 限制（最?。?4.2A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-6，D²Pak（5 引線+接片），TO-263BA 供應(yīng)商設(shè)備封裝:TO-263-5 包裝:帶卷 (TR) 其它名稱:AP1184K525L-13AP1184K525LDITR |
| LT1965IMS8E-1.5#PBF | 功能描述:IC REG LDO 1.5V 1.1A 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:800 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.5V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.7V @ 4A 穩(wěn)壓器數(shù)量:1 電流 - 輸出:4A 電流 - 限制（最?。?4.2A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-6，D²Pak（5 引線+接片），TO-263BA 供應(yīng)商設(shè)備封裝:TO-263-5 包裝:帶卷 (TR) 其它名稱:AP1184K525L-13AP1184K525LDITR |
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