STBC03 Datasheet, PDF (20/34 Pages) STMicroelectronics – Li-Ion linear battery charger with LDO and load switches

Functional pin description
6.9
SYS
STBC03
The internal LDO input voltage and external unregulated supply pin. The maximum current
deliverable through this pin depends on the following two conditions: LDO load and battery
status. However, if none of the above loads sinks current, the maximum SYS current
budget is 650 mA, provided that the input voltage source can deliver that amount of
current.
SYS voltage source can be either IN or BAT, depending on the operating conditions (refer
to the following table). A ceramic bypass capacitor of 1 µF must be connected to GND.
VIN
< VUVLO
< VUVLO
> < VUVLO and < VINOVP
> VINOVP
> VINOVP
Table 7: SYS voltage source
VBAT
SYS status
< VODC⁽¹⁾
Not powered
> VODC
VBAT⁽²⁾
X (don’t care)⁽³⁾
VIN
< VODC
Not powered
> VODC
VBAT⁽²⁾
LDO status
Off
On
On
Off
On
Notes:
(1)_{VODCR if the shutdown mode or the over-discharge protection has been previously activated.}
(2)_{Voltage drop over internal MOSFET is not included.}
(3)_{Battery disconnected (0 V) or fully discharged. Resistive short-circuit is not supported for safety reasons.}
6.10
6.11
LDO
LDO output voltage pin. The maximum current capability is anyhow 150 mA. A 1 µF
ceramic bypass capacitor must be connected to GND.
WAKE-UP
Wake-up input pin. To restore normal operations of the STBC03, so to exit from a
shutdown condition, connect the WAKE-UP pin to the battery voltage. The STBC03 is
enabled to operate in normal conditions again, only if the battery voltage is higher than
VODCR (3 V). A deglitch delay is implemented to prevent unwanted false operations. The
above-described WAKE-UP pin functionality is disabled when a valid VIN voltage source is
detected. The pin has an internal 50 kΩ pull-down resistor.
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