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| 型号： | LT1962EMS8-1.8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V .3A 8MSOP |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.8V |
| 输入电压： | 最高 20V |
| 电压 - 压降（标准）： | 0.27V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA |
| 电流 - 限制（最小）： | 320mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
| 配用： | DC1075A-ND - BOARD COMPANION |
LT1962 Series
APPLICATIO S I FOR ATIO
IN
OUT
V OUT
(see LT1962-5 Transient Response in the Typical Perfor-
V IN
LT1962
R2
+
mance Characteristics). However, regulator start-up time
GND
ADJ
R1
1962 F02
is inversely proportional to the size of the bypass capaci-
tor, slowing to 15ms with a 0.01 μ F bypass capacitor and
10 μ F output capacitor.
V OUT = 1 . 22 V ? 1 +
? + ( I ADJ )( R 2 )
V ADJ = 1 . 22 V
?
?
R2 ?
R 1 ?
Output Capacitance and Transient Response
The LT1962 regulators are designed to be stable with a
I ADJ = 30 nA AT 25 ° C
OUTPUT RANGE = 1.22V TO 20V
Figure 2. Adjustable Operation
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.
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
be proportional to the ratio of the desired output voltage to
1.22V: V OUT /1.22V. For example, load regulation for an
output current change of 1mA to 300mA is – 2mV typical
at V OUT = 1.22V. At V OUT = 12V, load regulation is:
(12V/1.22V)(–2mV) = – 19.7mV
Bypass Capacitance and Low Noise Performance
The LT1962 regulators may be used with the addition of a
bypass capacitor from V OUT to the BYP pin to lower output
voltage noise. A good quality low leakage capacitor is
recommended. This capacitor will bypass the reference of
wide range of output capacitors. The ESR of the output
capacitor affects stability, most notably with small capaci-
tors. A minimum output capacitor of 3.3 μ F with an ESR of
3 ? or less is recommended to prevent oscillations. The
LT1962-X is a micropower device and output transient
response will be a function of output capacitance. Larger
values of output capacitance decrease the peak deviations
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.
The shaded region of Figure 3 defines the range over which
the LT1962 regulators are stable. The minimum ESR
needed is defined by the amount of bypass capacitance
used, while the maximum ESR is 3 ? .
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
4.0
3.5
the regulator, providing a low frequency noise pole. The
noise pole provided by this bypass capacitor will lower the
output voltage noise to as low as 20 μ V RMS with the
addition of a 0.01 μ F bypass capacitor. Using a bypass
capacitor has the added benefit of improving transient
response. With no bypass capacitor and a 10 μ F output
capacitor, a 10mA to 300mA load step will settle to within
1% of its final value in less than 100 μ s. With the addition
of a 0.01 μ F bypass capacitor, the output will settle to
within 1% for a 10mA to 300mA load step in less than
10 μ s, with total output voltage deviation of less than 2%
3.0
2.5
2.0
1.5
1.0
0.5
0
1
STABLE REGION
C BYP = 0
C BYP = 100pF
C BYP = 330pF
C BYP ≥ 1000pF
2 3 4 5 6 7 8 9 10
OUTPUT CAPACITANCE ( μ F)
1962 F03
Figure 3. Stability
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1962EMS8-2.5 | 功能描述:IC REG LDO 2.5V .3A 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
| LT1962EMS8-2.5#PBF | 功能描述:IC REG LDO 2.5V .3A 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:MIC5365/66 Ultra-small LDO Regulators 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:最高 5.5V 电压 - 压降（标准）:0.155V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:200mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:4-UDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1x1） 包装:Digi-Reel® 其它名称:576-3192-6 |
| LT1962EMS8-2.5#PBF | 制造商:Linear Technology 功能描述:IC VOLT REG FIXED +2.5V BIPOLAR TS |
| LT1962EMS8-2.5#TR | 功能描述:IC REG LDO 2.5V .3A 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
| LT1962EMS8-2.5#TRPBF | 功能描述:IC REG LDO 2.5V .3A 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 产品培训模块:More Information on LDOs 标准包装:50 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 15V 电压 - 压降（标准）:1.1V @ 800mA 稳压器数量:1 电流 - 输出:800mA 电流 - 限制（最小）:800mA 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-4，D²Pak（3 引线+接片），TO-263AA 供应商设备封装:D2PAK-3 包装:管件 |
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