My customer have some problem with TPS61021A.
Their spec is input 0.9V~2.7V.
Output is 4V@0.5A.
No load
When input is 0.9 V, Vref is 240mV and output voltage is 1.0V
When input is 1.1 V, Vref is 360mV and output voltage is 1.6V
When input is 1.3 V, Vref is 440mV and output voltage is 1.8V.
When input is 1.5 V, Vref is 560mV and output voltage is 3.2V.
When input is 1.8 V, Vref is 800mV~900mV and output voltage is 4.1V~4.2V
under 1.8V, Vref is unstable and out voltage is untable.
How do I fix this issue?
