ETA9640

www.etasolution.com

1

Powering Minds of the Smart

5V/1A Synchronous Boost with 1A Linear Charger for Power Bank

DESCRIPTION

FEATURES

The ETA9640 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 100uA 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.

ETA9640 is available in ESOP8 package.



2in 1: A Synchronous boost plus A Charger



Short-circuit Protection



5W Output Power for the Boost



Boost Output to Input Reversed Current Protection



Up to 1A Charging



Up to 96% Efficiency during Boosting





Programmable Charging Current

APPLICATIONS



Portable Power Bank



Portable 3G/4G WiFi Hotspot



Tablet PC



Portable Device power with Li-ion battery and USB output

ORDERING INFORMATION

PART

PACKAGE PIN

TOP MARK

ETA9640E8A

ESOP-8

ETA9640

YWWPL ( Date Code)

TYPICAL APPLICATION

Typical Application Circuit

8

7

6

5

1

2

3

4

ETA9640

18650

锂电池

22uF

10uF

2.2-4.7uH

1nF

47K

10K

10uF

1.2K

Mini USB

USB

V+

D+

D-

V-

120K

36K

100K

放电指示部分，可省略

充电电流(A)

1000/1.2K

电量指示灯

1uF