About the npm1300 Vout1 output voltage

RE: About the npm1300 Vout1 output voltage

Kazi Afroza Sultana — Thu, 12 Mar 2026 14:54:33 GMT

VDD_POR is the voltage required to start the chip from reset.

''Why is the minimum required voltage for VDD_POR higher than the minimum VDD voltage? ''

Circuit needs extra voltage margin to start on reliably.

''Is there a risk of failure to start if I power the nRF54L15 with VDD = 1.71 V?''

yes there is a risk. As a design rule, choose a nominal VDD (for example 1.8 V, 2.5 V, 3.0 V, or 3.3 V) such that even with worst‑case tolerances you remain above both 1.7 V and the specified VDDPOR.

RE: About the npm1300 Vout1 output voltage

daxueseng — Thu, 12 Mar 2026 04:01:13 GMT

What do VDD_POR mean? Why is the minimum required voltage for VDD_POR higher than the minimum VDD voltage? Is there a risk of failure to start if I power the nRF54L15 with VDD = 1.71 V?

RE: About the npm1300 Vout1 output voltage

Kazi Afroza Sultana — Wed, 11 Mar 2026 13:47:37 GMT

Hello,

you can get 1.8V as output on nPM1304 (Buck startup configuration).

The levels are discrete, you cannot fine tune it with resistor. Maybe with TWI register write you could increase it. But the output voltage accuracy specification is +/-5% so the output voltage can be 1.71V in some cases/devices.