Battery powered boost and buck circuit solution

Knight97538

Battery powered boost and buck circuit solution [Copy link]

The circuit requires battery power supply, and the voltage fluctuation range of the buck-boost voltage is between 10-13V. Now a stable output of 12V is required, and automatic buck-boost is required to achieve automatic voltage stabilization and uninterrupted output. The current selection options are LM2577 and LTC3780.

Which teacher uses and is familiar with these two chips? Please give me some advice. Thank you.

1. The LM2577 series is a boost switching regulator produced by NSC. The output voltage is 12V, 15V and adjustable (ADJ). The input voltage range is wide, the minimum input voltage is +3.5V, and the maximum input voltage is +40V. The maximum duty cycle can reach 95% and the conversion efficiency is 80%. The
boost regulator circuit composed of LM2577-ADJ is shown in the figure below:

2. The LTC3780 is a high performance buck-boost switching regulator controller that can operate with an input voltage higher, lower or equal to the output voltage. The constant frequency current mode architecture provides a phase-lockable frequency of up to 400kHz. With a wide input and output range of 4V to 30V (36V maximum) and seamless switching between different operating modes, the LTC3780 is ideal for automotive, telecommunications and battery-powered systems.

tagetage

You need to use a buck-boost DC/DC chip to meet your requirement. The LM2577 series is a step-up switching regulator produced by NSC, so it cannot be used. However, the LTC3780 can be used. Also, you have to consider the output current.

chunyang

It is necessary to check whether the maximum current of the load can be met. If it can be met, it can be used.

chunyang

tagetage posted on 2023-5-24 15:18 You need to use a buck-boost DC/DC chip to meet your requirement. The LM2577 series is a boost switching regulator produced by NSC, so it cannot be used. LTC3780...

LM2577 is also a buck-boost type.

tagetage

Thanks for the reminder on the 4th floor. I checked and found that LM2577 is a buck-boost type. I would like to correct it.

led2015

Compared with LM2577, is LTC3780 more suitable for this application scenario?

不亦心

tagetage posted on 2023-5-24 18:57 Thanks for the reminder on the 4th floor. I checked and found that LM2577 is a buck-boost type. I hereby correct it.

Not a boost chip?

不亦心

You can use a SEPIC or buck & boost. Of course, if you have enough money, you can also use a four-switch buck-boost.

Knight97538

Bu Yixin posted on 2023-5-25 13:02 You can use a sepic, or buck&boost. Of course, if you have enough money, you can also use a four-switch buck-boost.

All right,

This suggestion is reliable, I understand