Operating description

PM6613N

20/30

DocID024974 Rev 3

4.8

Input current limit protection

An input current limit protection is integrated into the PM6613N. When the input current,

sensed by ACP and ACN pins, reaches 2 A more than the value stored on INPUT_AMP, the

internal circuit stops any charging process and sets the AOC bit of the STATUS register.

When the fault condition is not more present for 2.5 ms, the charging process is recovered

by a soft-start.

4.9

Thermal shutdown

exceeds 165 °C, the internal circuitry stops any charging process and the bit TS of STATUS

after 2.5 ms the charging process resumes by a soft-start.

4.10

Battery protection

Several protection features disable the charging process if the battery condition falls in one

of the following conditions:

•

battery undervoltage

•

battery overvoltage

•

battery overcurrent

A voltage fault is detected sensing the battery voltage on SRN pin. A battery undervoltage

condition occurs when the SRN voltage is below 2.5 V: the LB bit of the STATUS register is

set. A battery overvoltage occurs when SRN voltage exceeds the charging voltage

according to the Table 13:

Battery current is sensed by the current flowing through a small resistor connected between

SRP and SRN pins. An overcurrent condition occurs when the battery average current

exceeds the value set in the CHRG_AMP register by 2 A: the BOC bit of the STATUS

register is set.

4.11

Adapter insertion

sleep mode. If BSE of CHRG_OPT register is set, the BATFET selector is kept closed,

allowing the battery to supply the system. When the adapter is inserted, the ACDIV pin

voltage rises, and when it reaches a 0.65 V threshold, the PM6613N goes out of the sleep

mode. When the ACDIV pin reaches 2 V threshold, an internal comparator monitors this

condition for a programmable deglitch time, set to 250 ms at power-on reset. If the condition

is stable after this time, the ACOK pin goes high. This time can be reduced setting the AD bit

Table 13. Battery overvoltage detection ranges

Battery type

Overvoltage threshold

Li-Ion

CHRG_VOLT[mV]+170 mV* cells

CHRG_VOLT[mV]+144 mV* cells