Has anyone used a 15v to 3.3v converter?

yym86202

Has anyone used a 15v to 3.3v converter? [Copy link]

To power the fpga, 15v is directly converted to 3.3v. I bought someone else's before, but the chip model was worn off. Now I want to make my own board. I already know that the same function board used in our small instrument is RT9169, which directly converts to 3.3, and then uses KRC107_9S to stabilize the current. Does anyone know what this big chip is? The principle should also be directly converted to 3.3v and then stabilize the current. I don't know much about power supply. Please help me.

btty038

Wouldn't the voltage drop be too big? LDO should be a lot

yym86202

btty038 posted on 2018-12-19 09:18 Isn't the voltage drop big in this way? There should be a lot of LDOs

It's OK for us to use it this way. I guess the KRC107_9S current stabilization should work. The main thing is that we have certain requirements for temperature. Downhole instruments must withstand a temperature of 8.90 degrees, and occasionally more than 100 degrees~~

btty038

yym86202 posted on 2018-12-19 10:25 It is OK for us to use it this way. I guess the KRC107_9S steady flow should work. The main thing is that we have certain requirements for temperature. For downhole instruments, how can we...

The requirements are a bit high, but it is okay to choose military-grade and industrial-grade ones. It is better not to use ordinary ones.

qwqwqw2088

From the conversion principle, the voltage difference between 15v and 3.3v is slightly large. Such chips must exist, whether they are generated through ADJ or directly. Mature products generally do not convert directly in this way.

chunyang

It is best to use a switching power supply chip, there are so many to choose from.

kuake0618

DC-DC

Buck Products Input Voltage Output Voltage Output Current Frequency Package

PW2057 2.0V～6.0V 3.3V,1.8V,1.2V 0.7A 1.5MHz SOT23-5

PW2058 2.0V～6.0V 1V～5V 0.8A 1.5MHz SOT23-5

PW2051 2.5V～5.5V 1V～5V 1.5A 1.5MHz SOT23-5

PW2052 2.5V～5.5V 1V～5V 2.0A 1.0 MHz SOT23-5

PW2053 2.5V～5.5V 1V～5V 3.0A 1.0 MHz SOT23-5

PW2162 4.5V～16V 1V～15V 2A 600KHZ SOT23-6

PW2163 4.5V～16V 1V～15V 3A 600KHZ SOT23-6

PW2205 4.5V～30V 1V～28V 5A 500KHZ SOP8-EP

PW2312 4.0V～30V 1V～28V 1.2A 1.4 MHz SOT23-6

PW2330 4.5V～30V 1V～28V 3A 500KHz SOP8-EP

PW2431 4.5V～40V 1V～30V 3A 340KHz SOP8-EP

PW2558 4.5V～55V 1.25V～30V 0.8A 1.2 MHz SOT23-6

PW2608 5.5V～60V 1.5-30V 0.8A 0.3-1Mhz SOP8-EP

PW2815 4.5V～80V 1.5V～30V 1.5A 400KHZ SOP8-EP

PW2906 12V～90V 1.25V～20V 0.6A 150KHZ SOP8-EP

PW2902 8V～90V 5V～30V 2A 140KHZ SOP8-EP

PW2153 8V～140V 5V～30V 4A 140KHZ SOP8

LDO Products	Input voltage	Output voltage	Output Current	Static power consumption	Encapsulation
PW6566	1.8V～5.5V	1.2V1.5V,1.8V,2.0V,2.5, .2.8V,3.0V,3.3V,5V	250mA	2uA	SOT23-3
PW6218	4V～18V	3V,3.3V,5V	100MA	3uA	Sot23-3
PW6206	4.5V～40V	3V,3.3V,5V	150MA	4.2uA	Sot23/89
PW8600	4.5V～80V	3V,3.3V,5V	150MA	2uA	Sot23-3