General description:

The GD30WS8855x is a highly integrated, programmable, low quiescent current powermanagement integrated circuit (PMIC) that integrates the most common needs for wearablesand low power battery applications.The GD30WS8855x integrates a switching charger of programmable charging current (up to1.2A) and a synchronous boost converter at fixed 5V output. The IC also includes a 12-bitADC for battery gauge monitoring, and a low quiescent current, low noise LDO capable ofdelivering 50mA load current.The device integrates advanced power path management and control that allow the deviceto provide power to the system while charging the battery even with poor adapters. Thedynamic power path management automatically balances the currents delivered to thesystem and battery charging. A high voltage and over current protection circuit is implementedin the IC to protect it from high input voltage as high as 30V.The GD30WS8855x device supports charge current up to 1.2A and termination current downto 5mA. The maximum charge current is set at a default of 1.2A and is programmable byconnecting an external resistor from ISET pin to ground. The battery is charged using astandard Li-Ion charge profile with three phases: pre-charge, constant current and constantvoltage regulation.The device has several power saving modes to increase battery life whether the product is instorage or in operation. The quiescent current could be as low as 5uA when it is in sleepmode and thus most battery could sustain more than a year in shelf.The versatile features of GD30WS8855x allow for it to best used in wearable applicationssuch as headsets, earbuds and hearing aids, or low battery applications such as smartwatches and fitness accessories, or patient monitors and portable medical equipment.

Features:

 Extreme low quiescent current, <5µA in sleep mode

 Charging features

– Switching charging up to 1.2A maximum current programmable through ISET

– Support variety of battery chemistries, 4.15/4.25/4.35/4.4/4.45V @0.5%

– Full charge cycle: pre-charge, constant current and constant voltage

– Charging current and pre-charging current are all programmable through I2C

 Boost converter

– Support up to 600mA load current

– High efficiency synchronous boost converter @95%

– Output current limit programmable through I2C, 1.6A/1.8A/2.0A/2.2A

 Power path management

– Power path management allows simultaneous battery charging and system supply,system discharge priority

– When the system load increases, the charging current is reduced dynamicallyaccording to the input current and system voltage

– USB current limit programmable through I2C, 95%/100%/105%/110% @ICCCH +0.5A (Maximum current 3A)

– Over voltage protection up to 6V, VSYS voltage regulation limit: 4.6/4.68/4.77/4.85V

 Protection features

– Short Circuit Protection

– Over/Under temperature protection

– Input Over Voltage/Current Protection

– Boost over voltage (OV) during charge @5.5V

– Boost under voltage (UV) when charge/discharge @4.3V

 Additional features

– 3.3V LDO support 50mA

– Programmable LED driver

– Low external component count

– Simple I2C compatible interface

Applications:

 TWS earbuds charging case

 Headsets and hearing aids

 Low battery applications such as smart watches and fitness accessories

 Patient monitors and portable medical equipment