APL3202 datasheet(13/18 Pages) ANPEC

13 / 18 page

Rev. A.3 - Mar., 2012

APL3202

www.anpec.com.tw

Application Information

Input and Output Capacitors

Typically, a 4.7

µF ceramic capacitor is used to connect

from VIN to GND. Place the capacitor as close as pos-

sible to the VIN pin and GND pin for well operation. In

some start-up conditions, it maybe necessary to protect

the device against a hot plug input voltage. Adding a 6V

input zener diode between the VIN pin and GND clamps

the input voltage peak. In most applications, it is also

recommended to connect an X5R ceramic capacitor (1

µF,

typical) from BATT to GND for proper stability.

STAT Pin

The STAT pin can be used to drive a LED or communicate

with the host processor to show the charge status. When

the status is displayed by a LED, which has a current

rating less than 5mA, a resistor should be selected to

connect the LED in series, for programming at the de-

sired current value. The resistor is calculated by the fol-

lowing equation:

LED

)

(

−

When STAT pin is monitored by a processor, there should

be a 10k

Ω to 100kΩ pull-up resistor to connect the STAT

pin and the supply voltage of the processor.

Thermal Consideration

The most common measure of package thermal perfor-

mance is thermal resistance measured from the device

junction to the air surrounding the package surface (

JA).

The

JA can be calculated by the following equation:

−

where:

J= device junction temperature, maximum TJ=120°C

A= ambient temperature

D= device power dissipation

The device power dissipation, P

D, is a function of the

charge rate and the voltage drop across the internal FET.

It can be calculated by the following equation:

PCB Layout Consideration

Connect the battery to BATT as close as possible to pro-

vide accurate battery voltage sensing. The input and out-

put decoupling capacitors and the programmed resistor

SET should be placed as close as possible to the device.

The high-current charge paths into VIN and from the BATT

pins must be short and wide to minimize voltage drops.

Recommended Minimum Footprint

0.02

0.038

0.076

Unit : Inch

SOT-23-5

CHG

BATT

)

(

−

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