参数资料
| 型号： | SPX1582T5-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 4/7页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 3A TO263-5 |
| 标准包装： | 500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.25 V ~ 6 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.4V @ 3A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 3A |
| 电流 - 限制（最小）： | 3.1A |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-263-6，D²Pak（5 引线+接片），TO-263BA |
| 供应商设备封装： | TO-263-5 |
| 包装： | 带卷 (TR) |
APPLICATION INFORMATION
The SPX1582 is designed as a high performance
and low cost solution for applications requiring
a lower dropout than traditional NPN regulators.
The SPX1582 uses a separate input voltage V CTRL
( V CTRL ≥ V OUT + 1.3V) to minimize the dropout
voltage. This allows the 2.5V power for the load
to come from a 3.3V system supply. As an added
benefit this will reduce the heat dissipation*, and
lower heatsink and cooling fan costs.
The SPX1582 can power the 2.5V core voltage
for microprocessors such as a PentiumPC TM ,
P55C TM , AMD5k86 TM and K6 TM and the IBM
PowerPC TM 603EV and 604EV processors.
A typical application would use 3.3V for V IN and
5.0V for V CTRL from a motherboard power sup-
ply to provide a nominal 2.5V output. Using the
sense pin provides a Kelvin measurement of
output for reducing resistance-associated errors.
Power Up Sequencing
The SPX1582 requires a power up sequence in
that V IN must be applied before V CTRL to prevent
a latchup condition. If this is not possible, then a
10 Ω series resistor should be added to the V CTRL
input to prevent the device from entering into
latchup if V CTRL is applied before V IN .
Adjustable Regulator Design
1.25V reference voltage is being developed be-
tween the SENSE pin and the ADJ pin of the
SPX1582. Adding two external resistors (see fig
1.) will allow setting the output voltage from
1.25V to 6V. R 1 is chosen so that this current is
specified at a minimum load current of 10mA.
R 2 is given by the formula:
V OUT = V REF (1+ R 2 /R 1 ) + I ADJ (R 2 ).
The current flowing from the ADJ pin is typicaly
50 μ A. This ADJ pin contributes to the final
V OUT but is usually neglected. Connecting the
sense pin to the top of the resistor divider will
improve load regulation.
Lowering Noise
For the fixed voltage device, adding a capacitor
at the GND pin will improve transient response.
This capacitor is chosen in the range of 1 μ F to
0.1 μ F and will depend on the amount of output
capacitance in the system.
Jun 17-06 Rev F
SPX1582 3A Ultra Low Dropout Voltage Regulator
4
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SPX1582U | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed |
| SPX1582U-2.5 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed |
| SPX1582U-2.8 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed |
| SPX1582U-3.3 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed |
| SPX1582U5 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed |
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