请教一个输出1.25V的电源芯片

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 楼主| qljqlj 发表于 2007-9-18 13:39 | 显示全部楼层 |阅读模式
如题:请大家给个型号.谢谢
hzieeboy 发表于 2007-9-22 02:49 | 显示全部楼层

AP1513

我曾经用在IPTV上做过,价格很便宜2.5元,性能很好。
xwj 发表于 2007-9-22 04:24 | 显示全部楼层

TLV431、TL432、LM385-1.25V

Maxim也有很多,不过又贵又没货 <br /> 相关链接:<a href='http://para.maxim-ic.com/cache/en/results/39726.html'>http://para.maxim-ic.com/cache/en/results/39726.html</a>
xwj 发表于 2007-9-22 04:27 | 显示全部楼层

TI 德州仪器> 电压电流基准

<table class=ubb cellspacing=0><TR><td class=ubb>TI&nbsp;德州仪器>&nbsp;电压电流基准&nbsp;</td></TR><TR><td class=ubb>Texas&nbsp;Instruments&nbsp;美国&nbsp;TI&nbsp;德州仪器半导体公司&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;电压基准与电流基准&nbsp;</td></TR><TR><td class=ubb><b>产品概述</b>&nbsp;<br />并联电压基准&nbsp;<br />串联电压基准&nbsp;<br />电流基准&nbsp;</td></TR></table><br />非隔离式开关&nbsp;DC/DC&nbsp;调节器&nbsp;产品概述&nbsp;<table class=ubb cellspacing=0><TR><td class=ubb><b>Part&nbsp;Number&nbsp;</b></td><td class=ubb><b>Description&nbsp;</b>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;当前页面搜索:Ctrl+F</td></TR><TR><td class=ubb>并联电压基准</td></TR><TR><td class=ubb>LM236-2.5</td><td class=ubb>LM236-2.5&nbsp;2.5V&nbsp;集成参考电路</td></TR><TR><td class=ubb>LM285-1.2</td><td class=ubb>LM285-1.2&nbsp;微功耗电压参考</td></TR><TR><td class=ubb>LM285-2.5</td><td class=ubb>LM285-2.5&nbsp;微功耗电压参考</td></TR><TR><td class=ubb>LM336-2.5</td><td class=ubb>LM336-2.5&nbsp;2.5V&nbsp;集成参考电路</td></TR><TR><td class=ubb>LM336B-2.5</td><td class=ubb>LM336B-2.5&nbsp;精密电压参考</td></TR><TR><td class=ubb>LM385-1.2</td><td class=ubb>LM385-1.2&nbsp;微功耗电压参考</td></TR><TR><td class=ubb>LM385-2.5</td><td class=ubb>LM385-2.5&nbsp;微功耗电压参考</td></TR><TR><td class=ubb>LM385B-1.2</td><td class=ubb>LM385B-1.2&nbsp;微功耗电压参考</td></TR><TR><td class=ubb>LM385B-2.5</td><td class=ubb>LM385B-2.5&nbsp;微功耗电压参考</td></TR><TR><td class=ubb>LM4040A10</td><td class=ubb>LM4040A10&nbsp;10V&nbsp;精密微功耗并联电压参考,0.1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040A20</td><td class=ubb>LM4040A20&nbsp;2.048V&nbsp;精密微功耗并联电压参考,0.1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040A25</td><td class=ubb>LM4040A25&nbsp;2.5V&nbsp;精密微功耗并联电压参考,0.1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040A30</td><td class=ubb>LM4040A30&nbsp;3V&nbsp;精密微功耗并联电压参考,0.1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040A41</td><td class=ubb>LM4040A41&nbsp;4.096V&nbsp;精密微功耗并联电压参考,0.1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040A50</td><td class=ubb>LM4040A50&nbsp;5V&nbsp;精密微功耗并联电压参考,0.1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040A82</td><td class=ubb>LM4040A82&nbsp;8.192V&nbsp;精密微功耗并联电压参考,0.1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040B10</td><td class=ubb>LM4040B10&nbsp;10V&nbsp;精密微功耗并联电压参考,0.2%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040B20</td><td class=ubb>LM4040B20&nbsp;2.048V&nbsp;精密微功耗并联电压参考,0.2%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040B25</td><td class=ubb>LM4040B25&nbsp;2.5V&nbsp;精密微功耗并联电压参考,0.2%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040B30</td><td class=ubb>LM4040B30&nbsp;3V&nbsp;精密微功耗并联电压参考,0.2%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040B41</td><td class=ubb>LM4040B41&nbsp;4.096V&nbsp;精密微功耗并联电压参考,0.2%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040B50</td><td class=ubb>LM4040B50&nbsp;5V&nbsp;精密微功耗并联电压参考,0.2%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040B82</td><td class=ubb>LM4040B82&nbsp;8.192V&nbsp;精密微功耗并联电压参考,0.2%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040C10</td><td class=ubb>LM4040C10&nbsp;10V&nbsp;精密微功耗并联电压参考,0.5%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040C20</td><td class=ubb>LM4040C20&nbsp;2.048V&nbsp;精密微功耗并联电压参考,0.5%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040C25</td><td class=ubb>LM4040C25&nbsp;2.5V&nbsp;精密微功耗并联电压参考,0.5%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040C30</td><td class=ubb>LM4040C30&nbsp;3V&nbsp;精密微功耗并联电压参考,0.5%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040C41</td><td class=ubb>LM4040C41&nbsp;4.096V&nbsp;精密微功耗并联电压参考,0.5%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040C50</td><td class=ubb>LM4040C50&nbsp;5V&nbsp;精密微功耗并联电压参考,0.5%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040C82</td><td class=ubb>LM4040C82&nbsp;8.192V&nbsp;精密微功耗并联电压参考,0.5%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040D10</td><td class=ubb>LM4040D10&nbsp;10V&nbsp;精密微功耗并联电压参考,1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040D20</td><td class=ubb>LM4040D20&nbsp;2.048V&nbsp;精密微功耗并联电压参考,1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040D25</td><td class=ubb>LM4040D25&nbsp;2.5V&nbsp;精密微功耗并联电压参考,1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040D30</td><td class=ubb>LM4040D30&nbsp;3V&nbsp;精密微功耗并联电压参考,1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040D50</td><td class=ubb>LM4040D50&nbsp;5V&nbsp;精密微功耗并联电压参考,1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4040D82</td><td class=ubb>LM4040D82&nbsp;8.192V&nbsp;精密微功耗并联电压参考,1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4041A12</td><td class=ubb>LM4041A12&nbsp;1.2V&nbsp;精密微功耗并联电压参考,0.1%&nbsp;精确度</td></TR><TR><td class=ubb>LM4041B</td><td class=ubb>LM4041B&nbsp;可调节精密微功耗并联电压参考,0.2%&nbsp;精确度</td></TR><TR><td class=ubb>LM4041B12</td><td class=ubb>LM4041B12&nbsp;1.2V&nbsp;精密微功耗并联电压参考,0.2%&nbsp;精确度</td></TR><TR><td class=ubb>LM4041C</td><td class=ubb>LM4041C&nbsp;可调节精密微功耗并联电压参考,0.5%&nbsp;精确度</td></TR><TR><td class=ubb>LM4041C12</td><td class=ubb>LM4041C12&nbsp;1.2V&nbsp;精密微功耗并联电压参考,0.5%&nbsp;精确度</td></TR><TR><td class=ubb>LM4041D</td><td class=ubb>LM4041D&nbsp;可调节精密微功耗并联电压参考,1.0%&nbsp;精确度</td></TR><TR><td class=ubb>LM4041D12</td><td class=ubb>LM4041D12&nbsp;1.2V&nbsp;精密微功耗并联电压参考,1.0%&nbsp;精确度</td></TR><TR><td class=ubb>LT1004-1.2</td><td class=ubb>LT1004-1.2&nbsp;微功耗集成精确电压基准</td></TR><TR><td class=ubb>LT1004-2.5</td><td class=ubb>LT1004-2.5&nbsp;微功耗集成精密电压参考</td></TR><TR><td class=ubb>LT1009</td><td class=ubb>LT1009&nbsp;2.5V&nbsp;集成参考电路</td></TR><TR><td class=ubb>REF1004-1.2</td><td class=ubb>REF1004-1.2&nbsp;微功耗电压参考</td></TR><TR><td class=ubb>REF1004-2.5</td><td class=ubb>REF1004-2.5&nbsp;微功耗电压参考</td></TR><TR><td class=ubb>REF1112</td><td class=ubb>REF1112&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;1uA&nbsp;静态电流&nbsp;10ppm/℃&nbsp;漂移并联电压参考</td></TR><TR><td class=ubb>TL1431</td><td class=ubb>TL1431&nbsp;精密可调节(可编程)并联参考</td></TR><TR><td class=ubb>TL430</td><td class=ubb>TL430&nbsp;可调节并联稳压器</td></TR><TR><td class=ubb>TL431</td><td class=ubb>TL431&nbsp;可调节精密并联稳压器</td></TR><TR><td class=ubb>TL431A</td><td class=ubb>TL431A&nbsp;可调节精密并联稳压器</td></TR><TR><td class=ubb>TL431A-Q1</td><td class=ubb>TL431A-Q1&nbsp;可调节精密并联稳压器</td></TR><TR><td class=ubb>TL431B</td><td class=ubb>TL431B&nbsp;可调节精密并联稳压器</td></TR><TR><td class=ubb>TL431B-Q1</td><td class=ubb>TL431B-Q1&nbsp;Automotive&nbsp;Catalog&nbsp;Adjustable&nbsp;Precision&nbsp;Shunt&nbsp;Regulator</td></TR><TR><td class=ubb>TL432</td><td class=ubb>TL432&nbsp;可调节精密并联稳压器</td></TR><TR><td class=ubb>TL432A</td><td class=ubb>TL432A&nbsp;可调节精密并联稳压器</td></TR><TR><td class=ubb>TL432B</td><td class=ubb>TL432B&nbsp;可调节精密并联稳压器</td></TR><TR><td class=ubb>TLV431</td><td class=ubb>TLV431&nbsp;低电压可调节精密并联稳压器</td></TR><TR><td class=ubb>TLV431A</td><td class=ubb>TLV431A&nbsp;低电压可调节精密并联稳压器</td></TR><TR><td class=ubb>TLV431B</td><td class=ubb>TLV431B&nbsp;低电压可调节精密并联稳压器</td></TR><TR><td class=ubb>TLVH431</td><td class=ubb>TLVH431&nbsp;低电压可调节精密并联稳压器</td></TR><TR><td class=ubb>TLVH431A</td><td class=ubb>TLVH431A&nbsp;低电压可调节精密并联稳压器</td></TR><TR><td class=ubb>TLVH431B</td><td class=ubb>TLVH431B&nbsp;低电压可调节精密并联稳压器</td></TR><TR><td class=ubb>TLVH432</td><td class=ubb>TLVH432&nbsp;低电压可调节精密并联稳压器</td></TR><TR><td class=ubb>TLVH432A</td><td class=ubb>TLVH432A&nbsp;低电压可调节精度并联稳压器</td></TR><TR><td class=ubb>TLVH432B</td><td class=ubb>TLVH432B&nbsp;低电压可调节精度并联稳压器</td></TR><TR><td class=ubb>UC3910</td><td class=ubb>UC3910&nbsp;4&nbsp;位&nbsp;DAC&nbsp;和电压监视器</td></TR><TR><td class=ubb>串联电压基准&nbsp;</td></TR><TR><td class=ubb>REF2912</td><td class=ubb>REF2912&nbsp;采用&nbsp;SOT23-3&nbsp;系统封装的&nbsp;1.25V&nbsp;输出&nbsp;100ppm/℃&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压基准系列</td></TR><TR><td class=ubb>REF3112</td><td class=ubb>REF3112&nbsp;采用&nbsp;SOT23-3&nbsp;封装最大漂移&nbsp;20ppm/℃&nbsp;静态电流&nbsp;100uA&nbsp;的电压参考系列</td></TR><TR><td class=ubb>REF3012</td><td class=ubb>REF3012&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;1.25V&nbsp;输出&nbsp;50ppm/℃&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3212</td><td class=ubb>REF3212&nbsp;采用&nbsp;SOT23-6&nbsp;封装的&nbsp;1.25V&nbsp;输出&nbsp;4ppm/°C&nbsp;温漂静态电流为&nbsp;100uA&nbsp;的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF102</td><td class=ubb>REF102&nbsp;精密电压参考</td></TR><TR><td class=ubb>REF2920</td><td class=ubb>REF2920&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;2.048V&nbsp;输出&nbsp;100ppm/℃&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3120</td><td class=ubb>REF3120&nbsp;采用&nbsp;SOT23-3&nbsp;封装最大漂移&nbsp;20ppm/℃&nbsp;静态电流&nbsp;100&micro;A&nbsp;的电压参考系列</td></TR><TR><td class=ubb>REF3020</td><td class=ubb>REF3020&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;2.048V&nbsp;输出&nbsp;50ppm/℃&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3220</td><td class=ubb>REF3220&nbsp;采用&nbsp;SOT23-6&nbsp;封装的&nbsp;2.048V&nbsp;输出&nbsp;4ppm/C&nbsp;漂移&nbsp;100uA&nbsp;系列(带隙)电压参考</td></TR><TR><td class=ubb>REF2925</td><td class=ubb>REF2925&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;2.5V&nbsp;输出&nbsp;100ppm/℃&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3125</td><td class=ubb>REF3125&nbsp;采用&nbsp;SOT23-3&nbsp;封装最大漂移&nbsp;20ppm/℃&nbsp;静态电流&nbsp;100uA&nbsp;的电压参考系列</td></TR><TR><td class=ubb>REF3025</td><td class=ubb>REF3025&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;2.5V&nbsp;输出&nbsp;50ppm/℃&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3225</td><td class=ubb>REF3225&nbsp;采用&nbsp;SOT23-6&nbsp;封装的&nbsp;2.5V&nbsp;输出&nbsp;4ppm/C&nbsp;漂移&nbsp;100uA&nbsp;系列(带隙)电压参考</td></TR><TR><td class=ubb>REF2930</td><td class=ubb>REF2930&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;3.0V&nbsp;100ppm/℃,50uA&nbsp;系列(带隙)电压基准</td></TR><TR><td class=ubb>REF3130</td><td class=ubb>REF3130&nbsp;采用&nbsp;SOT23-3&nbsp;封装最大漂移&nbsp;20ppm/℃&nbsp;静态电流&nbsp;100uA&nbsp;的电压参考系列</td></TR><TR><td class=ubb>REF3030</td><td class=ubb>REF3030&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;3.0V&nbsp;输出&nbsp;50ppm/℃&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3230</td><td class=ubb>REF3230&nbsp;采用&nbsp;SOT23-6&nbsp;封装的&nbsp;3.0V&nbsp;输出&nbsp;4ppm/C&nbsp;漂移&nbsp;100uA&nbsp;系列(带隙)电压参考</td></TR><TR><td class=ubb>REF2933</td><td class=ubb>REF2933&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;3.3V&nbsp;输出&nbsp;100ppm/C&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3133</td><td class=ubb>REF3133&nbsp;采用&nbsp;SOT23-3&nbsp;封装最大漂移&nbsp;20ppm/℃&nbsp;静态电流&nbsp;100&micro;A&nbsp;的电压参考系列</td></TR><TR><td class=ubb>REF3033</td><td class=ubb>REF3033&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;3.3V&nbsp;输出&nbsp;50ppm/℃&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3233</td><td class=ubb>REF3233&nbsp;采用&nbsp;SOT23-6&nbsp;封装的&nbsp;3.3V&nbsp;输出&nbsp;4ppm/°C&nbsp;温漂静态电流为&nbsp;100uA&nbsp;的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF2940</td><td class=ubb>REF2940&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;4.096V&nbsp;输出&nbsp;100ppm/C&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3140</td><td class=ubb>REF3140&nbsp;采用&nbsp;SOT23-3&nbsp;封装最大漂移&nbsp;20ppm/℃&nbsp;静态电流&nbsp;100uA&nbsp;的电压参考系列</td></TR><TR><td class=ubb>REF3040</td><td class=ubb>REF3040&nbsp;采用&nbsp;SOT23-3&nbsp;封装的&nbsp;4.096V&nbsp;输出&nbsp;50ppm/℃&nbsp;漂移&nbsp;50uA&nbsp;静态电流的(带隙)电压参考系列</td></TR><TR><td class=ubb>REF3240</td><td class=ubb>REF3240&nbsp;采用&nbsp;SOT23-6&nbsp;封装的&nbsp;4.096V&nbsp;输出&nbsp;4ppm/C&nbsp;漂移&nbsp;100uA&nbsp;系列(带隙)电压参考</td></TR><TR><td class=ubb>REF02</td><td class=ubb>REF02&nbsp;+5V&nbsp;精密电压参考</td></TR><TR><td class=ubb>电流基准&nbsp;</td></TR><TR><td class=ubb>REF200</td><td class=ubb>REF200&nbsp;双路电流源/电流吸入器</td></TR></table>
tuwen 发表于 2007-9-22 07:06 | 显示全部楼层

LM317就是输出1.25V的。

  
grant_jx 发表于 2007-9-22 11:26 | 显示全部楼层

LZ没说清楚

到底是问需要基准源呢,还是固定输出的LDO呢?这两个冬冬可是不相干的。
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