Dual Ultra-Low Dropout Regulator

luckyCY

Dual Ultra-Low Dropout Regulator [Copy link]

Please recommend a dual-channel ultra-low dropout regulator similar to LP3986TL-3333. The input voltage is 3.3V, the output voltage is also 3.3V, and the output current is about 150mA. The main thing is that the cost should be low. Waiting online.

qwqwqw2088

Didn't I post something like this yesterday? The same question should be asked in one thread. https://bbs.eeworld.com.cn/thread-520578-1-1.html

luckyCY

qwqwqw2088 posted on 2017-2-21 10:59 Didn’t I post something like this yesterday? The same question should be asked in one thread https://bbs.eeworld.com.cn/thread-520578-1-1.ht ...

Because no one has replied. So I want to post it again. It’s my first time posting, I don’t know the rules, sorry

maychang

"The input voltage is 3.3V, and the output voltage is also 3.3V" The input and output are the same, that's not the case.

luckyCY

maychang posted on 2017-2-21 12:09 "The input voltage is 3.3V, and the output voltage is also 3.3V" The input and output are the same, but that is not the case.

It can also be a range value, but it must include 3.3V

maychang

luckyCY posted on 2017-2-21 14:28 It can also be a range value, but it must include 3.3V

That is not available either. Low voltage difference is not zero voltage difference. When the voltage is zero, the current is also zero. This is the internal block diagram of LP3986. The voltage between the drain and source of the MOS tube is zero, so how can there be current?

luckyCY

maychang posted on 2017-2-21 14:50 That's not true either. Low voltage difference is not zero voltage difference. When the voltage is zero, the current is also zero. This is the internal block diagram of LP3986. Between the drain and source of the MOS tube...

Um, I don't know about this. I am also learning, and I saw that the solution given by the teacher uses LP3986TL-3333. But because the package is too small and difficult to solder, I didn't verify whether this chip can work, so I wanted to change the chip. As long as it has this function, it's fine. It feels like a switch. When EN1 is enabled, out1 has a voltage output. When EN2 is enabled, out2 has a voltage output. Otherwise, the voltage is turned off. I just want to save energy. So the input and output voltages don't need to change. Just recommend a chip that can achieve this function. Thank you!

maychang

luckyCY posted on 2017-2-21 15:36 Um, I don't know about this. I am also learning, and I saw that the solution given by the teacher is to use LP3986TL-3333. But because the package is too small, it is difficult to solder, ...

"It feels like a switch. When EN1 is enabled, out1 has a voltage output. When EN2 is enabled, out2 has a voltage output. Otherwise, the voltage is turned off." Relays have this function. If you think the relay life is short and the mechanical action noise is loud, you can use two P-channel MOS tubes instead. Anyway, you don't need voltage regulation (then you don't need a reference voltage) or overcurrent protection.

luckyCY

maychang posted on 2017-2-21 15:46 "It feels like a switch. When EN1 is enabled, out1 has voltage output. When EN2 is enabled, out2 has voltage output. Otherwise, the voltage is turned off." ...

Can you give me a chip model? ? We designed the ARM development board ourselves. So we need a ready-made chip. .

maychang

luckyCY posted on 2017-2-21 16:02 Can you give me a chip model? ? We are designing our own ARM development board. So we need a ready-made chip. .

"I saw that the solution given by the teacher is to use LP3986TL-3333. But because the package is too small, it is difficult to solder." Then you should still retain the voltage regulation function. There are various models of single or dual-channel low-dropout voltage regulators. Go to http://www.datasheetcatalog.com/ and search for Low-Dropout CMOS Voltage Regulator as a keyword.

luckyCY

maychang posted on 2017-2-21 16:21 "I saw that the solution given by the teacher is to use LP3986TL-3333. But because the package is too small, it is difficult to solder." Then you should still retain the voltage regulation function. ...

OK. I will try it. Thank you