STBC15 Datasheet Ultra-low current consumption linear battery charger Features Charges thin film battery with CC-CV algorithm L version suitable for Li-Ion batteries Charging current up to 40 mA (selectable by dedicated pins) QFN12 1.7 x 2.0 250 nA battery leakage current Reverse current protection from battery to supply input Programmable floating voltage with 0.5% accuracy Battery overcurrent protection Battery over-discharge protection switch totally disconnects battery for cell Flip-chip12 durability Shelf-mode supported, no battery mechanical switch needed Power-Good open-drain output Valid source open drain output Peak mode input to avoid over-discharge false triggering Available packages: QFN12 1.7 x 2.0 mm, thickness 0.55 mm max. Flip-chip12 1.1 x 1.4 mm, 300 m pitch Applications Fitness portable Internet of Things Energy harvesting application Maturity status link Smart cards STBC15 Wireless sensor nodes Portable health care devices Fitness and wellness wearable devices Description The STBC15 is a linear charger thin film battery with a maximum charging current of 40 mA. The device uses a CC/CV algorithm to charge the battery. Thanks to the ultra-low consumption architecture, the charger is suitable for low-capacity cells such as thin film batteries and can use low energy sources such as energy harvesters. A 5 V input like a standard USB port can be used as a voltage source as well. A specific version (-L) is available to charge Li-Ion cells. The STBC15 integrates an over-discharge and overcurrent protection circuitry to prevent the battery from being damaged under fault conditions. The floating voltage value can be set to four different values by using dedicated selection inputs. A higher set of floating voltages, suitable for Li-Ion batteries, is available in the -L version of the product. A dedicated pin allows the device to be set in shelf-mode. In this condition, the STBC15 consumes less than 10 nA, thus not discharging the battery before the final device is activated by the end user. The ultra-low power architecture allows the STBC15 to consume less than 250 nA when the input power source is removed and less than 10 nA in over-discharge-mode. The device is available in a (1.7 2.0 mm) 12-lead QFN package, 400 m pitch, 0.55 mm max. thickness or in Flip-chip 1.1 x 1.4 mm 12 bumps 300 m pitch. DS12551 - Rev 2 - July 2021 www.st.com For further information contact your local STMicroelectronics sales office.STBC15 Application schematic 1 Application schematic Figure 1. STBC15 application schematic V to SET0,12 CHGIN for 4.2 V FLOAT OUT System CHGIN Source R R 1 2 C 1 C 2 V SET0 CHGIN OK V SET1 PG STBC15 I SET0 I BAT SET1 I to SET0,1 CHGIN for 40mA PKM from MCU GND SM Table 1. Typical bill of material (BOM) Symbol Value Description Note C1 10 F (16 V) Input supply voltage capacitor Ceramic type C2 10 F (10 V) System output capacitor Ceramic type R1, R2 10 k Pull-up resistors Film type DS12551 - Rev 2 page 2/22