STBC03 datasheet(19/34 Pages) STMICROELECTRONICS

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STBC03

Functional pin description

DocID029927 Rev 2

19/34

6.5

BATSNS, BATSNSFV

Battery voltage sense pin. The BATSNS pin must be connected as close as possible to the

battery positive terminal to ensure the maximum accuracy on the floating voltage and on

the battery voltage protection thresholds. The BATSNSFV pin can be used to fix the VFLOAT

value by connecting a proper external series resistor to BATSNSFV. The battery floating

voltage can be set up to 4.45 V according to the following equation:

Equation 2:

�� = �� ∗ (1 +

��

1��Ω

) �� = 4.2 ∗ (1 +

��

1��Ω

) ��

Example: to set the battery floating voltage for 4.35 V, refer to the following equation.

Equation 3:

�� = 1��Ω ∗ (

��

4.2��

− 1) = 1��Ω ∗ (

4.35��

4.2��

− 1) = 35.7��Ω

If the BATSNSFV pin is connected to the battery positive terminal, the floating voltage is

set for its 4.2 V default value.

6.6

BAT

External battery connection pin (positive terminal). A 4.7 µF ceramic bypass capacitor must

be connected to GND.

6.7

5 V input supply voltage pin. The STBC03 is powered off from this pin when a valid voltage

source is detected, meaning a voltage higher than VUVLO and lower than VINOVP. A 10 µF

ceramic bypass capacitor must be connected to GND.

STBC03 Scheda tecnica(PDF) 19 Page - STMicroelectronics