Datasheet > AAT3686

AAT3686

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		电池
页数	文件大小	规格书
24页	481K
描述
USB Port/AC Adapter Lithium-Ion/Polymer Battery Charger

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中文翻译

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数据手册

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AAT3686 数据手册

AAT3686

USB Port/AC Adapter

Lithium-Ion/Polymer Battery Charger

Timing Diagram

SQ_PULSE

P_DATA

System Reset

System Start

T_SYNC

T_LAT

T_OFF

Data

T_DATA(RPT)= T_SYNC+ T_LAT< 2.5 P_DATA

T_OFF> 2 P_DATA

N=3

N=1

N=2

V_BAT= Battery voltage as seen at the BAT pin

Thermal Considerations

The AAT3686 is offered in a 4x4mm TDFN pack-

age which can provide up to 2.7W of power dissi-

pation when it is properly bonded to a printed cir-

cuit board and has a maximum thermal resistance

of 37°C/W. Many considerations should be taken

into account when designing the printed circuit

board layout, as well as the placement of the

charger IC package in proximity to other heat gen-

erating devices in a given application design. The

ambient temperature around the charger IC will

also have an effect on the thermal limits of a bat-

tery charging application. The maximum limits that

can be expected for a given ambient condition can

be estimated by the following discussion:

I_CC= Maximum constant fast charge current pro-

grammed for the application

I_OP= Quiescent current consumed by the charg-

er IC for normal operation

Next, the maximum operating ambient temperature

for a given application can be estimated based on

the thermal resistance of the 4x4mm TDFN pack-

age when sufficiently mounted to a PCB layout and

the internal thermal loop temperature threshold.

Eq. 2:

T_A= T_J- (θ_JA· P_D)

First, the maximum power dissipation for a given

situation should be calculated:

Where:

T_A

T_J

= Ambient temperature in degrees C

Eq. 1:

P_D= [(V_IN- V_BAT) · I_CC+ (V_IN· I_OP)]

= Maximum device junction temperature

below the thermal loop threshold

P_D= Total power dissipation by the device

Where:

θ_JA= Package thermal resistance in °C/W

P_D= Total power dissipation by the device

V_IN= Either V_ADPor V_USB, depending on which

mode is selected

3686.2006.06.1.5

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中文翻译

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