The ETA9635 is a fully integrated power management unit
specifically designed for Power Bank, Mobile Charger,
Backup Battery Charger applications. It consists of a high
efficiency synchronous step-up boost converter and a
linear battery charger. The boost can provide up to 1A
output current at 5V of from a Li-Ion battery input voltage,
while the charger can charge up to 1A of current from an
AC adapter input. The boost incorporates circuits that
disconnect the input from output, during shutdown,
short-circuit, output current overloading, or other events
when output is higher than the input. This not only
eliminates the need for an external MOSFET and its control
circuitry to disconnect the input from output, also provides
robust output overload protection. Using a patent pending
technique to drive the charger LED indicator, it eliminates
the need for a micro-controller normally needed in mobile
chargers. While saving the cost of a micro-controller, since
the whole units only consumes less than 50uA of quiescent
current during no load, when considering standby time for
one charge, it is a much superior solution comparing to the
traditional solution that needs a micro-controller which
normally consumes up to 1mA current.
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