STEVAL-ISB033V1 STMicroelectronics

S T E VA L - I S B 0 3 3 V 1 Evaluation board for STBCFG01 single-cell Li+ battery charger with OTG boost, voltage mode fuel gauge and 200 mA LDO Data brief USB OTG VBUS generation (500 mA) USB overvoltage protection Programmable battery overcurrent protection Automatic 60 mA input pre-bias IC compatible control interface Interrupt output pin RoHS compliant Description The STEVAL-ISB033V1 is an evaluation board to test the first-of-its-kind STBCFG01 switch mode battery charger for single cell Li-Ion batteries, which integrates a highly accurate voltage mode fuel gauge to monitor a battery s state of charge. The device also provides a 5 V output to supply USB OTG (on-the-go) bus-powered devices in addition to an LDO linear voltage regulator to support system boot in dead battery conditions. The STBCFG01 uses accurate measurements of Features the battery voltage which allows the estimation of High-efficiency switching battery charger the battery s state-of-charge (SOC) without a 2 MHz or 3 MHz switching frequency current-sensing resistor. The switching charger 1.2 A max. charging current works together with the fuel gauge to simplify monitoring features and to save current 20 V tolerant input with OVP consumption when the device is not charging. Programmable input current limitation The battery charger features a smart input and dynamic input current limit current limit the maximum input current can be Battery overvoltage protection selected through the IC interface, and if the input Auto-recharge voltage drops below a programmable threshold, Integrated current sensing resistor even if the selected maximum current limit USB compatible current has not been reached yet the dynamic Voltage mode fuel gauge input current limit function is activated, preventing External sensing resistor not needed the input current from increasing further. The Battery swap detection through ID dynamic input current limit function can be resistor disabled, if necessary. An automatic input pre- Low battery voltage and low SOC bias load makes the device suitable for programmable alarms applications using voltage sources requiring a 50 mA LDO for system boot in dead battery minimum external load for correct regulation. condition April 2015 DocID027724 Rev 1 1/4 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ISB033V1 1 Schematic diagram Figure 1: STEVAL-ISB033V1 circuit schematic 2/4 DocID027724 Rev 1