PKM

Min. VBAT_OVD [V]

Max. VBAT_OVD [V]

1

2.2

2.3

Table 10. Battery over-discharge voltages for the STBC15L

PKM

Min. VBAT_OVD [V]

Max. VBAT_OVD [V]

x

2.65

2.75

7.6

Shelf mode

The STBC15 provides an ultra-low power mode with current consumption less than 10 nA in order to support long

period of shelf storage of the final equipment with minimum battery discharge.

In this case, even if the battery is charged and its voltage is above the cut-off voltage, it can be disconnected from

the system by applying a positive pulse to SM pin.

7.7

Reverse current protection

The STBC15 avoids reverse current flowing from the battery to the input voltage source when the CHGIN voltage

is lower than BAT voltage. This is particularly important when a photovoltaic panel is used as an input voltage

source. This function is accomplished by turning off M1 switch when CHGIN voltage drops below CHGIN UVLO

threshold.

7.8

STBC15 / STBC15L difference summary

The STBC15 is dedicated to thin film batteries while the STBC15L to li-Ion batteries. Here below a summary of

the main differences:

Table 11. STBC15 / STBC15L difference summary

Name

PKM

STBC15

STBC15L

VFLOAT

x

4.0 V to 4.2 V

4.2 V to 4.4 V

VBAT_OVD

PKM=0

3.25 V

2.7 V

PKM=1

2.25 V

2.7 V

VBAT_CONN

PKM=0

4.10 V

3.6 V

PKM=1

4.10 V

3.9 V

STBC15

Shelf mode

DS12551 - Rev 1

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