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| 型号： | LT1580IT7-2.5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC LDO REGULATOR 7A 2.5V TO220-7 |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 50 |
| 应用： | 转换器，Intel Pentium? |
| 输入电压： | 1.79 V ~ 6 V |
| 输出数： | 1 |
| 输出电压： | 2.5V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-7 成形引线 |
| 供应商设备封装： | TO-220-7 |
| 包装： | 管件 |
LT1580/LT1580-2.5
APPLICATIO N S I N FOR M ATIO N
pin and the top of the resistor divider are connected to the
top of the load. The bottom of the resistor divider is
connected to the bottom of the load. R P is now effectively
connected inside the regulating loop of the LT1580 and the
load regulation at the load will be negligible for reasonable
5V
values of R P . Trace B of Figure 3 illustrates the effect on
output regulation. It is important to note that the voltage
drops due to R P are not eliminated. They will add to the
dropout voltage of the regulator regardless of whether
they are inside the loop as in Figure 2 or outside the loop
as in Figure 1. This means that the LT1580 can control the
voltage at the load as long as the input-output voltage is
3.3V
V POWER
V CONTROL
SENSE
greater than the total of the dropout voltage of the LT1580
plus the voltage drop across R P .
LT1580
Stability
ADJ
R2
V OUT
R1
R P
R P
LOAD
+
V OUT
–
The LT1580 requires the use of an output capacitor as part
of the device frequency compensation. The device re-
quires a minimum of 22 μ F tantalum or 150 μ F of aluminum
electrolytic to ensure stability. Larger capacitor values
increase stability and improve transient performance.
1580 F01
Figure 1. Conventional Load Sensing
5V
Many different types of capacitors are available and have
widely varying characteristics. These capacitors differ in
capacitor tolerance (sometimes up to ± 100%), equivalent
series resistance, equivalent series inductance and ca-
3.3V
V POWER
V CONTROL
SENSE
pacitance temperature coefficient. The LT1580 frequency
compensation optimizes frequency response with low
LT1580
ESR capacitors. In general, use capacitors with an ESR of
less than 1 ? .
ADJ
V OUT
R P
+
For microprocessor applications larger value capacitors
R2
R1
R P
LOAD
V OUT
–
1580 F02
will be needed to meet the transient requirements of the
processor. Processor manufacturers require tight voltage
tolerances on the power supply. High quality bypass
capacitors must be used to limit the high frequency noise
generated by the processor. Multiple small ceramic ca-
Figure 2. Remote Load Sensing
( ? I OUT )(R P )
V OUT
FIGURE 1
V OUT
FIGURE 2
I OUT
pacitors in addition to high quality bulk tantalum capaci-
tors are typically required to limit parasitic inductance
(ESL) and resistance (ESR) in the capacitors to acceptable
levels. The LT1580 is stable with the type of capacitors
recommended by processor manufacturers.
Bypassing the adjust terminal on the LT1580 improves
ripple rejection and transient response. The ADJ pin is
brought out on the fixed voltage device specifically to
allow this capability.
TIME
1580 F03
Capacitor values on the order of several hundred microfar-
8
Figure 3. Remote Sensing Improves Load Regulation
ads are used to ensure good transient response with heavy
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1581 | 制造商:LINER 制造商全称:Linear Technology 功能描述:10A, Very Low Dropout Regulators |
| LT-1581-111-012 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
| LT-1581-111-125 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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