Table 6. STBC15 floating voltage selection

VSET1

VSET0

Floating voltage [V]

0

0

4.00

0

1

4.05

1

0

4.10

1

1

4.20

Table 7. STBC15L floating voltage selection

VSET1

VSET0

Floating voltage [V]

0

0

4.20

0

1

4.25

1

0

4.35

1

1

4.40

7.3

Charge current selection

The charge current is defined by external pin configuration shown in the table below.

Table 8. Charge current selection

ISET1

ISET0

Battery charging current [mA]

0

0

10

0

1

20

1

0

30

1

1

40

7.4

Battery recharge

When CHGIN voltage drops below the level defined by VBAT - VBAT_ASD, the device turns M3 on and the OUT pin

is supplied by the battery (BPS state). The battery recharge restarts again when the voltage on CHGIN exceeds

the level defined by VBAT + VBAT_RECHG voltage. The device goes to CHG state.

7.5

Over-discharge protection and peak mode

The STBC15 protects the battery by disconnecting it when its voltage is below a certain level defined by the

VBAT_OVD threshold. This function protects the battery from over-discharging. In order to maintain the over-

discharge status, the battery voltage should, in any condition, stay above the VBAT_FF threshold.

In some application conditions, such as during RF transmission bursts, it is requested that the battery sustains

short transients below the typical VBAT_OVD level. In order to support this behavior and avoid false triggering of the

over-discharge mechanism, it is possible to lower the VBAT_OVD threshold by using the PKM pin. When this pin is

pulled low, the VBAT_OVD threshold is decreased to a lower level according to the table below.

Table 9. Battery over-discharge voltages for the STBC15

PKM

Min. VBAT_OVD [V]

Max. VBAT_OVD [V]

0

3.2

3.3

STBC15

Charge current selection

DS12551 - Rev 1

page 12/23