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參數(shù)資料
| 型號(hào)： | LT1963A-2.5 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1.5A, Low Noise, Fast Transient Response LDO Regulators |
| 中文描述： | 1.5A的，低噪聲，快速瞬態(tài)響應(yīng)LDO穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 11/20頁(yè) |
| 文件大?。?/td> | 278K |
| 代理商： | LT1963A-2.5 |
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11
LT1963A Series
1963af
Figure 2. Adjustable Operation
IN
1963 F02
R2
OUT
V
IN
V
OUT
ADJ
GND
LT1963A
R1
+
V
V
R
R
I
R
V
I
ADJ
OUTPUT RANGE = 1.21V TO 20V
V
A
OUT
ADJ
ADJ
=
+
ê
(
1
)( )
=
=
1 21
.
1
2
2
1 21
3
m
AT 25 C
.
Figure 3. Ceramic Capacitor DC Bias Characteristics
APPLICATIU
The LT1963A series are 1.5A low dropout regulators op-
timized for fast transient response. The devices are ca-
pable of supplying 1.5A at a dropout voltage of 350mV.
The low operating quiescent current (1mA) drops to less
than 1
m
A in shutdown. In addition to the low quiescent
current, the LT1963A regulators incorporate several pro-
tection 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 LT1963A-X
acts like it has a diode in series with its output and prevents
reverse current flow. Additionally, in dual supply applica-
tions where the regulator load is returned 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
DC BIAS VOLTAGE (V)
C
1963 F03
20
0
–20
–40
–60
–80
–1000
4
8
10
2
6
12
14
X5R
Y5V
16
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10
μ
F
Adjustable Operation
The adjustable version of the LT1963A has an output
voltage range of 1.21V 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 voltage at the ADJ
pin at 1.21V referenced to ground. The current in R1 is
then equal to 1.21V/R1 and the current in R2 is the current
in R1 plus the ADJ pin bias current. The ADJ pin bias
current, 3
m
A 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 less than 4.17k 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.
The adjustable device is tested and specified with the ADJ
pin tied to the OUT pin for an output voltage of 1.21V.
Specifications for output voltages greater than 1.21V will
be proportional to the ratio of the desired output voltage to
1.21V: V
OUT
/1.21V. For example, load regulation for an
output current change of 1mA to 1.5A is –3mV typical at
V
OUT
= 1.21V. At V
OUT
= 5V, load regulation is:
(5V/1.21V)(–3mV) = –12.4mV
Output Capacitance and Transient Response
The LT1963A regulators are designed to be stable with a
wide range of output capacitors. The ESR of the output
capacitor affects stability, most notably with small capaci-
tors. A minimum output capacitor of 10
m
F with an ESR of
3
W
or less is recommended to prevent oscillations. Larger
values of output capacitance can decrease the peak devia-
tions and provide improved transient response for larger
load current changes. Bypass capacitors, used to decouple
individual components powered by the LT1963A, will
increase the effective output capacitor value.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior over
temperature and applied voltage. The most common
dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and
Y5V dielectrics are good for providing high capacitances
in a small package, but exhibit strong voltage and tem-
perature coefficients as shown in Figures 3 and 4. When
used with a 5V regulator, a 10
m
F Y5V capacitor can exhibit
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PDF描述 |
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| LT1963A | 1.5A, Low Noise, Fast Transient Response LDO Regulators |
| LT1963A-1.5 | 1.5A, Low Noise, Fast Transient Response LDO Regulators |
| LT1963A-1.8 | 1.5A, Low Noise, Fast Transient Response LDO Regulators |
| LT1963AEQ | 1.5A, Low Noise, Fast Transient Response LDO Regulators |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1963A-3.3 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1.5A, Low Noise, Fast Transient Response LDO Regulators |
| LT1963AEFE | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.21V to 20V 1.5A 16-Pin TSSOP EP |
| LT1963AEFE#PBF | 功能描述:IC REG LDO ADJ 1.5A 16TSSOP 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(yè)面:1075 (CN2011-ZH PDF) 其它名稱:296-24390-1 |
| LT1963AEFE#TR | 制造商:Linear Technology 功能描述:SP-LINREG, 1.5A, Fast Transient LDO in FE-16 |
| LT1963AEFE#TRPBF | 功能描述:IC REG LDO ADJ 1.5A 16TSSOP 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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