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參數(shù)資料
| 型號： | LT1962EMS8-2.5 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 300mA, Low Noise, Micropower LDO Regulators |
| 中文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.43 V DROPOUT, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 138K |
| 代理商： | LT1962EMS8-2.5 |
6
LT1962 Series
and provide improved transient response for larger load
current changes. Bypass capacitors, used to decouple
individual components powered by the LT1962, will in-
crease the effective output capacitor value. With larger
capacitors used to bypass the reference (for low noise
operation), larger values of output capacitance are needed.
For 100pF of bypass capacitance, 4.7
μ
F of output capaci-
tor is recommended. With a 1000pF bypass capacitor or
larger, a 6.8
μ
F output capacitor is recommended.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
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 capacitance in
a small package, but exhibit strong voltage and tempera-
ture coefficients as shown in Figures 3 and 4. When used
with a 5V regulator, a 10
μ
F Y5V capacitor can exhibit an
effective value as low as 1
μ
F to 2
μ
F over the operating
temperature range. The X5R and X7R dielectrics result in
more stable characteristics and are more suitable for use
as the output capacitor. The X7R type has better stability
across temperature, while the X5R is less expensive and
is available in higher values.
Voltage and temperature coefficients are not the only
sources of problems. Some ceramic capacitors have a
piezoelectric response. A piezoelectric device generates
voltage across its terminals due to mechanical stress,
Figure 4. Ceramic Capacitor Temperature Characteristics
Figure 3. Ceramic Capacitor DC Bias Characteristics
DC BIAS VOLTAGE (V)
C
1962 F04
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
TEMPERATURE (
°
C)
–50
40
20
0
–20
–40
–60
–80
–100
25
75
1962 F04
–25
0
50
100
125
Y5V
C
X5R
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10
μ
F
similar to the way a piezoelectric accelerometer or micro-
phone works. For a ceramic capacitor the stress can be
induced by vibrations in the system or thermal transients.
The resulting voltages produced can cause appreciable
amounts of noise, especially when a ceramic capacitor is
used for noise bypassing. A ceramic capacitor produced
Figure 5’s trace in response to light tapping from a pencil.
Similar vibration induced behavior can masquerade as
increased output voltage noise.
Figure 5. Noise Resulting from Tapping on a Ceramic Capacitor
LT1962-5
C
OUT
= 10
μ
F
C
BYP
= 0.01
μ
f
I
LOAD
= 100mA
V
500
μ
V/DIV
100ms/DIV
1962 F05
Thermal Considerations
The power handling capability of the device will be limited
by the maximum rated junction temperature (125
°
C). The
power dissipated by the device will be made up of two
components:
APPLICATIOU
W
U
U
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| LT1962 | 300mA, Low Noise, Micropower LDO Regulators |
| LT1962EMS8-5 | 300mA, Low Noise, Micropower LDO Regulators |
| LT1962EMS8-3.3 | 300mA, Low Noise, Micropower LDO Regulators |
| LT1963AEST-1.5 | 1.5A, Low Noise, Fast Transient Response LDO Regulators |
| LT1963AES8-1.5 | 1.5A, Low Noise, Fast Transient Response LDO Regulators |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1962EMS83 | 制造商:LTC 功能描述: |
| LT1962EMS8-3 | 功能描述:IC REG LDO 3V .3A 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:50 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.3V 輸入電壓:最高 15V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 800mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:800mA 電流 - 限制（最?。?800mA 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-4，D²Pak（3 引線+接片），TO-263AA 供應(yīng)商設(shè)備封裝:D2PAK-3 包裝:管件 |
| LT1962EMS8-3#PBF | 功能描述:IC REG LDO 3V .3A 8-MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:MIC5365/66 Ultra-small LDO Regulators 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:3V 輸入電壓:最高 5.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.155V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?200mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:4-UDFN 裸露焊盤，4-TMLF? 供應(yīng)商設(shè)備封裝:4-TMLF?（1x1） 包裝:Digi-Reel® 其它名稱:576-3192-6 |
| LT1962EMS8-3#PBF | 制造商:Linear Technology 功能描述:IC VOLT REG FIXED +3V BIPOLAR TSSO 制造商:Linear Technology 功能描述:IC, ADJ LDO REG 1.22V TO 20V 0.3A MSOP-8 |
| LT1962EMS8-3#TR | 功能描述:IC REG LDO 3V .3A 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:50 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3.3V 輸入電壓:最高 15V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 800mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:800mA 電流 - 限制（最?。?800mA 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-4，D²Pak（3 引線+接片），TO-263AA 供應(yīng)商設(shè)備封裝:D2PAK-3 包裝:管件 |
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