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OB2113VKP is a highly integrated and cost effective controller for Li-Ion Battery Power Bank application. It integrates one synchronous step-down DC-DC Buck converter (5V input, 3.1A output) and one synchronous step-up DC/DC Boost converter (5V/3.1A).
When only external power supply is present, OB2113VKP enters the Buck operation mode to charge the Li-Ion battery. Constant current (trickling current or large current of up to 3.1A) operation mode or constant voltage operation mode is provided to charge the Li-Ion battery depending on the status of the battery. Fully protection functions including input Over Voltage Protection (OVP), battery OVP, battery Over Temperature Protection (OTP), cycle-by-cycle Over Current Protection (OCP) are provided.
When both external power supply and external loading are presented, OB2113VKP enters path-through operation mode. The internal power bridge is turned on to directly connect the external power supply with the external loading. OB2113VKP distributes the maximum allowed external power supply power to satisfy the need of the external loading first and then distributes the rest power to charge up the Li-Ion battery through the Buck operation. In addition to the full set of protection features in Buck operation, output SCP is also provided under this mode.
When only external loading is presented, OB2113VKP enters the Boost operation mode to discharge the Li-Ion battery. Constant voltage operation mode (up to 5V/3.1A) is provided to charge up the loading. Fully protection functions including output Over Voltage Protection (OVP), battery Under Voltage Protection (UVP), battery OTP, output Over Current Protection (OCP), cycle-by-cycle OCP and output Short Circuit Protection (SCP) are provided.
When neither the external power supply nor the external loading is connected to OB2113VKP, OB2113VKP enters idle mode, where no switching is operated. OB2113VKP enters sleep mode after staying in idle mode for more than 10s. Very low power consumption (typically about 30uA at 3.7V battery voltage) is obtained in sleep mode. Either the plug-in of external power supply or external loading or pushing-button will wake up OB2113VKP.
OB2113VKP is offered with TSSOP24 package.
n Integrated Buck, Boost, and power bridge in one SOC
n Up to 3.1A charging current for Type-C input supply, and 2.4A charging current for Micro-B input supply
n Up to 5V/3.1A discharging current
n intelligent power distribution at path-through mode
n Support Apple and Samsung equipment detection
n Input BC1.2 charge detection, compatible host USB charging
n Support load current line compensation
n Support Battery power LED indication
n Very low sleep mode power consumption (typical 25uA, 3.7V battery voltage)
n Drive capacitive load
n Provide trickle charging function when battery is over discharged
n Comprehensive protections: input OVP, output OVP, output SCP, battery OVP, battery UVP, battery OTP, OCP.
n Li-Ion battery power bank
n Single Li-Ion battery portable device
Figure1 OB2113VKP Typical Application Diagram （standalone operation）