LTC4162-L maximum input voltage

Hello robrien_ftr,

The purpose of VIN_OVLO is for the input voltage shutdown protection. The range of 37.6-40.0V is the protection shut-down threshold range. If at some point the input reaches this range, the switching charger will stop delivering power.

Regards,

Nino

Hi Nino,

That does not answer my question. I understand the purpose of VIN_OVLO. My question is whether the absolute maximum rating of 36 V on VIN is correct as the VIN_OVLO range is 37.6-40 V which violates the 36 V rating of VIN.

Hello,

Upon my understanding, the Input Overvoltage Protection is typically higher with an allowance than the Absolute Maximum Rating voltage of the VIN. This is done so the part won't unnecessarily trip the protection especially when operating on a high input voltage range. As an example, if you're operating on Max VIN, there may be overshoots on startup and might already trip the voltage shutdown protection.

Regards,

Nino

Hi Nino,

That does not make sense. The absolute maximum value on VIN is the highest voltage VIN can tolerate without damage. The datasheet states if VIN exceeds VIN_OVLO, the charger will stop delivering power to the battery. However, by the time VIN reaches VIN_OVLO, VIN abs max has already been exceeded and the IC will be damaged. Why would the device implement an overvoltage protection that activates at a voltage higher than the device can sustain?

I have separately reached out to Analog technical support for further assistance. I will post my findings here.

I spoke with an applications engineer at Analog and they verified that the absolute maximum voltage on VIN is indeed 36 V and the recommended maximum is 35 V. The VIN_OVLO values listed in the electrical characteristics table may be incorrect but the abs max value is correct and has precedence.