参数资料
| 型号： | LT1581CT7 |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC LDO REGULATOR 10A ADJ TO220-7 |
| 标准包装： | 50 |
| 应用： | 转换器，Intel Pentium? |
| 输入电压： | 1.68 V ~ 6 V |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 4.65 V |
| 工作温度： | 0°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 |
LT1581/LT1581-2.5
APPLICATIO N S I N FOR M ATIO N
5V
LT1581 can control the voltage at the load as long as the
input/output voltage is greater than the total of the dropout
3.3V
POWER
CONTROL
SENSE
voltage of the LT1581 plus the voltage drop across R P .
LT1581
Stability
ADJ
R2
OUTPUT
R1
R P
R P
LOAD
+
V OUT
–
The LT1581 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.
Figure 1. Conventional Load Sensing
5V
1581 F01
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-
pacitance temperature coefficient. The LT1581 frequency
3.3V
POWER
CONTROL
LT1581
SENSE
compensation optimizes frequency response with low
ESR capacitors. In general, use capacitors with an ESR of
less than 1 ? .
ADJ
OUTPUT
R P
+
For microprocessor applications larger value capacitors
will be needed to meet the transient requirements of the
R2
R1
R P
LOAD
V OUT
–
processor. Processor manufacturers require tight voltage
tolerances on the power supply. High quality bypass
capacitors must be used to limit the high frequency noise
Figure 2. Remote Load Sensing
( ? I OUT )(R P )
V OUT
FIGURE 1
V OUT
FIGURE 2
I OUT
1581 F02
generated by the processor. Multiple small ceramic ca-
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 LT1581 is stable with the type of capacitors
recommended by processor manufacturers.
Bypassing the adjust terminal on the LT1581 improves
ripple rejection and transient response. The ADJUST pin is
brought out on the fixed voltage device specifically to
allow this capability.
Capacitor values on the order of several hundred microfar-
TIME
1581 F03
ads are used to ensure good transient response with heavy
Figure 3. Remote Sensing Improves Load Regulation
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
load current changes. Output capacitance can increase
without limit and larger values of output capacitance
further improve the stability and transient response of the
LT1581.
Modern microprocessors generate large high frequency
current transients. The load current step contains higher
order frequency components that the output coupling
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1581CT7#06 | 制造商:Linear Technology 功能描述:10A Linear Regulator |
| LT1581CT7#06PBF | 制造商:Linear Technology 功能描述:LDO Regulator Pos 1.25V to 4.65V 10A 7-Pin(7+Tab) TO-220 |
| LT1581CT7#45PBF | 制造商:Linear Technology 功能描述:SP-LINREG, 10A Linear Regulator |
| LT1581CT7#PBF | 功能描述:IC LDO REGULATOR 10A ADJ TO220-7 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| LT1581CT7-2.5 | 功能描述:IC LDO REGULATOR 10A 2.5V TO2207 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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