MP2610 – 2A, 24V INPUT, 1.1MHz 1-2CELL SWITCHING LI-ION BATTERY CHARGER

MP2610 Rev. 0.91

www.MonolithicPower.com

14

7/13/2010

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PC Board Layout

The high frequency and high current paths (GND,

IN and SW) should be placed to the device with

short, direct and wide traces. The input capacitor

needs to be as close as possible to the IN and

GND pins. The external feedback resistors

should be placed next to the FB pin. Keep the

switching node SW short and away from the

feedback network.

Application for USB Input

When a USB is selected as the power source of

the switching charger, the typical application

circuit is as figure 7 shows. One PMOS is used

instead of the block diode D1 to low down the

voltage drop, and realizing less minimum input to

charge a single cell battery full. The charge

current is set to be 1A to satisfy turbo USB or

5Vin Wall-Adapter specification requirement and

realize the fast charging.

Figure 8 is the typical charging curve. The charge

current can’t keep constant at the setting value

during the operation at the constant current

charging mode. It drops down when the

maximum duty of the part is hit. Set the charge

current lower, the constant current charge

duration will be extended. Results illuminates that

MP2610 is reasonable for the usual USB input

application.