<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">The data sheet Figure 12 says that at 100mA load current you will be around 90% +-5% efficient for Battery 5.5V to 2.6 V after 2.6V you are on your own! For 250mA the efficiency will be a bit worse particularly at the lower voltages. </div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">The voltage will stay at 3.3 V very precisely over that range but will have a small ripple that will not change.</div>
<div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small">I think it will do what you want if used correctly.</div>
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