LM2623 as buck-boost?

J. Larox

Other Parts Discussed in Thread: LM2623

How can I transform an LM2623 into a buck-boost topology by using this example diagram?

An LM2623 has the EN pin connected to the output and has a single GND.

0 Frank De Stasi over 11 years ago

The LM2623 should work in this application; although I do not know of anyone who has tested it.

Be careful about the maximum input voltage on the gate of Q1. The abs max on the LM2623 EN pin is 10V; so

it can be connected to Vin if that restriction is respected.

0 J. Larox over 11 years ago in reply to Frank De Stasi

Problem is, the input voltage is variable (cells) I noticed that the output drops a few 100mV when voltage on EN pin drops.

How can I limit the voltage on the EN, BOOT and Vdd and FB pins without limiting the output voltage?

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