Design review of power circuit for EC200U

[Abhishek_Singh]

Attaching the power schematic for EC200U. It includes 74LVC1G00GV NAND IC which acts as flipflop to enable short press ON and Long press On of the main Power IC.

LN2220 is a step up IC which boost the battery 3.7V to 5V. It gets merged with USB supply through schkttky diode. LN5059SOT converts it to 4V, required to drive 4G module and LN6215 converts to 3.3V for other peripheral ICs.

Attaching the datasheet of each ICs(Most ICs datasheet are in Chinese, can’t help here)

Kindly review and suggest if the power circuit is good enough to drive 4G module both in terms of stability and current sourcing.

LN5059_C.pdf (640.3 KB)
LN6215_C.pdf (1018.0 KB)
LN2220_C(1).pdf (456.8 KB)

[FelixCheng-Q]

Hi
Please find the local operator or the module acquirer to solve the schematic diagram check, thank you

[rajvignesh]

@Abhishek_Singh any luck / update on this? I have been stuck with the same situation. I tried powering EC200U, straight from a boost regulator TPS61023DRLT and no luck. Tried other regulators like TLV61070ADBVR & STBB1APUR. Yet no luck. But I see you boosted it to 5V and again stepped it down to 4V. Any reason for this instead of just stepping it up to 4V? I understand you have a parallel 5V from USB. But if it were not to be there, still would you have done the step-up and then down thing?