Q
I'd like to use the ADP1607 to supplying the ADAU1761 for a mobile audio
project (single cell). For suppling by USB or external supply I inteded a LDO.
To avoid voltage drop I shoudn't use a diode for connecting Vout of the LDO to
the Vout of the ADP1607. Thats why I'm looking for a DC/DC stepup converter
with reverse current protection both the EN PIN is OFF or ON.
A
The ADP1607 has an internal high side P-FET. So there is a body diode
conducting from the switch node to Vout. The Vout pin is specified as abs max
rating from -0.3V to +3.6V independent of Vin. By definition boost regulators
prevent reverse current, since without a diode from switch node to Vout, the
output voltage could not get boosted up to higher values than Vin. The body
diode of the high side P-FET as shown in the block diagram on page 10 is
implemented regardless of the EN high or EN low.
