DC-DC negative voltage output chip use

静静地期待

DC-DC negative voltage output chip use [Copy link]

LTC is a DC-DC chip that inputs a positive voltage and outputs a corresponding negative voltage. When it is used, can the circuit connection be as shown in the figure above? Can pins 1, 6, and 7 be left floating? What kind of packaging do the two capacitors in the figure generally use?

maychang

How to output negative voltage if V+ is not connected to a positive power supply?

qwqwqw2088

Read the manual carefully, and leave the floating parts floating. Just follow the instructions. LTC1144 is an integrated circuit for charge pump boost. It is used in situations where the output current is not large and the driving capacity is small.

静静地期待

maychang posted on 2017-12-15 21:00 How to output negative voltage if V+ is not connected to the positive power supply?

It should be connected, but it is not specifically connected. Is there any problem with the other parts?

静静地期待

qwqwqw2088 posted on 2017-12-15 21:20 Read the manual carefully, and leave the pins that should be left floating. Just follow the manual. LTC1144 is an integrated circuit for charge pump boost. Its output current is not large, and its driving capability is small...

The output of LTC1144 is connected to an op amp, so as long as the output current of LTC1144 is greater than the input current of the op amp, it will be fine, right?

maychang

Quietly waiting for the post on 2017-12-15 21:32 It is to be connected, but it is not specifically connected. Is there any problem with the other parts?

Look at the datasheet carefully. The output load capacity of LTC1144 is relatively large among charge pump chips.

静静地期待

maychang posted on 2017-12-15 21:43 Look carefully at the datasheet. The output load capacity of LTC1144 is relatively large among charge pump chips.

Thank you very much~