Datasheet > AAT3686IXN-4.2-T1

AAT3686IXN-4.2-T1

更新时间： 2024-02-18 00:46:31

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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AAT3686IXN-4.2-T1 技术参数

生命周期：	Transferred	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.69
Base Number Matches：	1

AAT3686IXN-4.2-T1 数据手册

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AAT3686

USB Port/AC Adapter

Lithium-Ion/Polymer Battery Charger

Example:

1µF to 22µF is recommended. If the source supply

is unregulated, it may be necessary to increase the

capacitance to keep the input voltage above the

under-voltage lockout threshold during device

enable and when battery charging is initiated.

For an application where the fast charge current for

the adapter mode is set to 1A, V_ADP= 5.0V, and the

worst case battery voltage is 3.0V, what is the max-

imum ambient temperature where the thermal lim-

iting will become active?

If the AAT3686 adapter input is to be used in a sys-

tem with an external power supply source, such as

a typical AC-to-DC wall adapter, then a C_INcapaci-

tor in the range of 10µF should be used. A larger

input capacitor in this application will minimize

switching or power bounce effects when the power

supply is "hot plugged." Likewise, a 10µF or greater

input capacitor is recommended for the USB input

to help buffer the effects of USB source power

switching, noise, and input cable impedance.

Given:

V_ADP= 5.0V

V_BAT= 3.0V

I_CC= 1A

I_OP= 0.75mA

T_J

= 110°C

θ_JA= 37°C/W

Output Capacitor

The AAT3686 only requires a 1µF ceramic capaci-

tor on the BAT pin to maintain circuit stability. This

value should be increased to 10µF or more if the

battery connection is made any distance from the

charger output. If the AAT3686 is to be used in

applications where the battery can be removed

from the charger, such as in the case of desktop

charging cradles, an output capacitor greater than

10µF may be required to prevent the device from

cycling on and off when no battery is present.

Using Equation 3, calculate the device power dissi-

pation for the stated condition:

Eq. 3:

P_D= (5.0V - 3.0V)(1A) + (5.0V · 0.75mA)

= 2.00375W

The maximum ambient temperature before the

AAT3686 thermal loop becomes active can now be

calculated using Equation 4:

Printed Circuit Board Layout

Considerations

Eq. 4:

T_A= 110°C - (37°C/W · 2.00375W) = 35.86°C

= 35.86°C

For the best results, it is recommended to physical-

ly place the battery pack as close to the AAT3686

BAT pin as possible. To minimize voltage drops on

the PCB, keep the high current carrying traces ade-

quately wide. For maximum power dissipation of the

AAT3686 TDFN package, the metal substrate

should be solder bonded to the board. It is also rec-

ommended to maximize the substrate contact to the

PCB ground plane layer to further increase local

heat dissipation. Refer to the AAT3686 evaluation

board for a good layout example.

Therefore, under the stated conditions for this

worst case power dissipation example, the

AAT3686 will enter the thermal loop and lower the

fast charge constant current when the ambient

operating temperature rises above 35.86°C.

Capacitor Selection

Input Capacitor

In general, it is good design practice to place a

decoupling capacitor between the V_ADPand V_USB

pins and ground. An input capacitor in the range of

3686.2006.06.1.5

1...17 18 192021 22 23 24

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