What low Iq LDO do you use?

[Mad ID]

Hi,
for my battery powered designs I usually use NCP4587 LDO from ON Semiconductor. It's a great LDO because it's quiescent current is only 1uA when the CPU is sleeping but can deliver great transient performance by adjusting it's ground current quickly.

The problem is that it is very small and it's not suitable for some boards (SOT-23 version not easily available).

Can you recommend a LDO which has very little ground current when the output current is low (<100uA) but can provide very good load transient on higher currents. In other words, the LDO should increase it's internal current on higher loads to provide performance and be ready for load steps.

I find it difficult to find a LDO similar to NCP but in bigger package.

Thanks

[rvalente]

MCP1711 is available in SOT-223 as well, active current of 600nA...
http://ww1.microchip.com/downloads/en/DeviceDoc/20005415A.pdf

MC1700 you can get even in TO-92, SOT-89 and SOT-223 (or even DFN), the acitve current is bigger, 1.6uA.
http://ww1.microchip.com/downloads/en/DeviceDoc/20001826C.pdf

Have you check TI's parts?

Sometimes I find myself in similar situations, I was looking for a boost buck converter, which would take one LiPo and output 3V3, lots and lots of parts available from all vendors, but they're all tiny tiny, probable smartphone market oriented.

[Mad ID]

MCP1711 is available in SOT-223 as well, active current of 600nA...
http://ww1.microchip.com/downloads/en/DeviceDoc/20005415A.pdf

MC1700 you can get even in TO-92, SOT-89 and SOT-223 (or even DFN), the acitve current is bigger, 1.6uA.
http://ww1.microchip.com/downloads/en/DeviceDoc/20001826C.pdf

Have you check TI's parts?

Sometimes I find myself in similar situations, I was looking for a boost buck converter, which would take one LiPo and output 3V3, lots and lots of parts available from all vendors, but they're all tiny tiny, probable smartphone market oriented.

Heh, these regulators are very very slow. If I have any device which can draw 50mA in transient output voltage would drop which can reset the CPU and cause all kind of problems. That's why this is hard

I want to avoid using two LDO, one for sleep and other during operation..

[rvalente]

Hum, can't you fit one or two tantalum capacitor?

[Mad ID]

Hum, can't you fit one or two tantalum capacitor?

In a lot of cases no, that is why I'm searching for a good LDO.
10uF should be enough to provide me with good transient response from 5 -> 50mA.

[mikerj]

LP2981-N maybe?

[Mad ID]

LP2981-N maybe?

65uA Iq..not good

[ralphd]

I have recently been looking for something similar.  The xc6206(662k) is one I'm thinking of buying.  Ive seen them even cheaper than the ams1117.
http://www.torex-europe.com/products/range/120