Datasheet > 电源电路 > 电源管理电路> AAT3687IWP-4.2-2-T1

AAT3687IWP-4.2-2-T1

更新时间： 2024-02-22 00:02:00

品牌	Logo	应用领域
ANALOGICTECH		电源电路电池电源管理电路
页数	文件大小	规格书
22页	553K
描述
Lithium-Ion/Polymer Battery Charger

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技术参数
数据手册

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AAT3687IWP-4.2-2-T1 技术参数

生命周期：	Obsolete	包装说明：	,
Reach Compliance Code：	unknown	风险等级：	5.72
Is Samacsys：	N	Base Number Matches：	1

AAT3687IWP-4.2-2-T1 数据手册

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AAT3687

Lithium-Ion/Polymer Battery Charger

Where:

Thermal Considerations

The AAT3687 is offered in a 3x3mm TDFN pack-

age which can provide up to 2.0W of power dissi-

pation when it is properly bonded to a printed cir-

cuit board and has a maximum thermal resistance

of 50°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.

T_A= Ambient Temperature in °C

T_J= Maximum Device Junction Temperature

Below the Thermal Loop Threshold

P_D= Total Power Dissipation by the Device

θ_JA= Package Thermal Resistance in °C/W

Example:

For an application where the fast charge current for

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

battery voltage at 3.6V, what is the maximum ambi-

ent temperature at which the thermal loop will

become active?

Given:

First, the maximum power dissipation for a given

situation should be calculated:

V_ADP= 5.0V

V_BAT= 3.6V

I_CC= 1A

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

Eq. 5:

I_OP= 0.75mA

T_J

= 110°C

Where:

θ_JA= 50°C/W

P_D= Total Power Dissipation by the Device

V_IN= Input Voltage Amplitude, V_ADP

Using Equation 5, calculate the device power dissi-

pation for the stated condition:

V_BAT= Battery Voltage as Seen at the BAT Pin

I_CC= Maximum Constant Fast Charge Current

Programmed for the Application

P_D= (5.0V - 3.6V)(1A) + (5.0V

= 1.40375W

· 0.75mA)

Eq. 7:

I_OP= Quiescent Current Consumed by the

Charger IC for Normal Operation

Next, the maximum operating ambient temperature

for a given application can be estimated based on

the thermal resistance of the 3x3mm TDFN pack-

age when sufficiently mounted to a PCB layout and

the internal thermal loop temperature threshold.

The maximum ambient temperature before the

AAT3687 thermal loop becomes active can now be

calculated using Equation 6:

T_A= 110°C -

(

50°C/W

· 1.40375W)

Eq. 8:

= 39.8125°C

T_A= T_J- (θ_JA

· P_D)

Eq. 6:

Therefore, under the stated conditions for this

worst case power dissipation example, the

AAT3687 will enter the thermal loop and lower the

fast charge constant current when the ambient

operating temperature rises above 39.8°C.

3687.2006.06.1.5

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