Are there any recommendations for 5V boost switching chips?

wangerxian

Are there any recommendations for 5V boost switching chips? [Copy link]

 

I recently used an MT3608 boost switch chip, but found that it could not be completely powered off. After the EN pin was pulled low, VOUT still had output (3.0+V voltage), which did not meet the requirements of my current project. What 5V boost switch chips do you use? It would be best if they were made in China.

Supplement: The input is 4.2V lithium battery, boosted to 5V, with a maximum current of 1A.

maychang

"After the EN pin is pulled low, VOUT still has output (3.0+V voltage)"

I guess changing the chip won't solve the problem.

When the chip is not working, the SW pin is in high impedance state. At this time, Vin can still be transmitted to Vout through L and D. Therefore, there is still voltage at the Vout end after the chip stops working.

tagetage

Please tell me about the input voltage range requirements and output current requirements, otherwise I can't help you.

qwqwqw2088

5V boost to several V

What is the current size?

qwqwqw2088

The first floor said that it is impossible to completely cut off the power.

The boost chip EN is low and cannot shut down the output voltage.

It can be understood that EN turns on the boost function, not turns off the output voltage.

yaoquan5201314

maychang posted on 2022-6-1 11:54 "After the EN pin is pulled low, VOUT still has output (3.0+V voltage)" I guess changing the chip won't solve the problem. When the chip doesn't work, SW ...

Yes, because of the inductance, there is still output even if the EN pin is pulled low. When I encounter this situation in actual applications, I always add a MOS tube in front of the boost IC, or add a pair of transistors to the boost IC output LDO to shut down the output drive.

wangerxian

tagetage posted on 2022-6-1 12:53 Please tell me about the input voltage range requirements and output current requirements, otherwise I can’t help you.

Single lithium battery 4.2V input, boost to 5V, maximum current 1A.

wangerxian

qwqwqw2088 posted on 2022-6-1 13:11 5V boost to a few V and current size

Single lithium battery 4.2V input, boost to 5V, maximum current 1A.

wangerxian

yaoquan5201314 posted on 2022-6-1 13:22 Yes, because there is an inductor, even if the EN pin is pulled low, there is still output. When I encounter this situation in actual applications, I add MO before the boost IC...

You just need to add a MOS or transistor control in front

wangerxian

qwqwqw2088 posted on 2022-6-1 13:19 The first floor said that it is impossible to completely cut off the power. The boost chip EN is low and cannot shut down the output voltage. It can be understood that EN turns on the boost function, not...

Yes, if there is a chip that meets my needs, I will use the corresponding chip. If not, I can only add a control circuit in front of the boost chip.

dcexpert

wangerxian posted on 2022-6-1 13:28 Single lithium battery 4.2V input, boost to 5V, maximum current 1A.

Using a mobile power chip also solves the charging problem.

wangerxian

dcexpert posted on 2022-6-1 16:55 Using a mobile power chip also solves the charging problem.

Do you have any recommended models? I'll take a look.

cat3902982

You can consider adding a MOS tube to control the on and off

wangerxian

cat3902982 posted on 2022-6-1 17:47 The OP can consider adding a MOS tube to control the on and off function

There is this consideration

dcexpert

wangerxian posted on 2022-6-1 17:32 Do you have any recommended models? I'll take a look.

There are many models, the simplest one is the IP53xx series in SO-8 package, such as IP5305.

wangerxian

dcexpert posted on 2022-6-1 21:22 There are many models, the simplest one is the IP53xx series in SO-8 package, such as IP5305.

I'll take a look

Fred_1977

You can look for brands and models of DC-DC synchronous boost ICs, and there are quite a few in China.

chipsimi003

G5177 can.

wangerxian

chipsimi003 posted on 2022-6-10 11:12 G5177 is OK.

I'll go take a look.

VX13600169521

Try FP6291