AAT3682 데이터 시트보기 (PDF) - Skyworks Solutions

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AAT3682

Li-Ion/Polymer Linear Battery Charger

Skyworks Solutions 

VF = Diode forward voltage

ICC = Constant current charge level for the system

Schottky Diodes

Schottky diodes are selected for this application because

they have a low forward voltage drop, typically between

0.3V and 0.4V. A lower VF permits a lower voltage drop

at the constant current charge level set by the system;

less power will be dissipated in this element of the cir-

cuit. A Schottky diode allows for lower power dissipation,

smaller component package sizes, and greater circuit

layout densities.

DATA SHEET

AAT3682

Li-Ion/Polymer Linear Battery Charger

Rectifier Diodes

Any general purpose rectifier diode can be used with the

AAT3682 application circuit in place of a higher cost

Schottky diode. The design trade-off is that a rectifier

diode has a high forward voltage drop. VF for a typical

silicon rectifier diode is in the range of 0.7V. A higher VF

will place an input supply voltage requirement for the

battery charger system. This will also require a higher

power rated diode since the voltage drop at the constant

current charge amplitude will be greater. Refer to the

previously stated equations to calculate the minimum VIN

and diode PD for a given application.

Figure 6: Evaluation Board Top Side Layout.

Figure 7: Evaluation Board Bottom Side Layout.

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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201884B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • April 25, 2012

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