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AAT3680ITP-4.2-T1 PDF预览

AAT3680ITP-4.2-T1

更新时间： 2024-01-03 18:49:33
品牌 Logo 应用领域
AAT 电池光电二极管控制器
页数 文件大小 规格书
18页 213K
描述
Lithium-Ion/Polymer Linear Battery Charge Controller

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AAT3680ITP-4.2-T1 技术参数

是否Rohs认证： 符合生命周期：Obsolete
包装说明：TSOJ, TSSOJ12,.11,20Reach Compliance Code：unknown
风险等级：5.84JESD-30 代码：R-PDSO-J12
湿度敏感等级：1端子数量：12
最高工作温度：70 °C最低工作温度：-20 °C
封装主体材料：PLASTIC/EPOXY封装代码：TSOJ
封装等效代码：TSSOJ12,.11,20封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, THIN PROFILE电源：4.5/12 V
认证状态：Not Qualified子类别：Power Management Circuits
最大供电电流 (Isup)：3 mA表面贴装：YES
温度等级：COMMERCIAL端子形式：J BEND
端子节距：0.5 mm端子位置：DUAL
Base Number Matches：1

AAT3680ITP-4.2-T1 数据手册

 浏览型号AAT3680ITP-4.2-T1的Datasheet PDF文件第9页浏览型号AAT3680ITP-4.2-T1的Datasheet PDF文件第10页浏览型号AAT3680ITP-4.2-T1的Datasheet PDF文件第11页浏览型号AAT3680ITP-4.2-T1的Datasheet PDF文件第13页浏览型号AAT3680ITP-4.2-T1的Datasheet PDF文件第14页浏览型号AAT3680ITP-4.2-T1的Datasheet PDF文件第15页 
AAT3680  
Lithium-Ion/Polymer  
Linear Battery Charge Controller  
5. Calculate the required threshold voltage to  
deliver ICHARGE(REG)  
Where ICHARGE(REG) is the desired typical charge cur-  
rent during constant current charge mode. VP-VCSI  
is the voltage across RSENSE, shown in the Electrical  
Characteristic table as VCS. To program a nominal  
500mA charge current during fast-charge, a 200mΩ  
value resistor should be selected. Calculate the  
worst case power dissipated in the sense resistor  
according to the following equation:  
:
VGS = (VCS + VOL@DRV) - VP(MIN)  
= (0.1V + 0.1V) - 4.5V  
= -4.3V  
where VGS is the available gate-to-source voltage  
provided by the AAT3680, VCS is the voltage  
across the sense resistor, VOL@DRV is the rated  
low voltage at the DRV pin, and VP(MIN) is the  
worst case input voltage (assuming 10% toler-  
ance on the 5V supply). Choose a MOSFET  
device with sufficiently low VGS(TH) so the device  
(VCS)2  
P =  
RSENSE  
(0.1)2  
=
0.2  
= 50mW  
will conduct the desired ICHARGE(REG)  
.
6. Calculate the worst case maximum allowable  
RDS(ON) at worst case VGS voltage:  
A 500mW LRC type sense resistor from IRC is  
adequate for this purpose. Higher value sense  
resistors can be used, decreasing the power dissi-  
pated in the sense resistor and pass transistor.  
The drawback of higher value sense resistors is  
that the charge cycle time is increased, so tradeoffs  
should be considered when optimizing the design.  
(VP(MIN) - VCS(MAX) - VBAT(MAX)  
)
RDS(ON)  
=
=
ICHARGE(REG)  
(4.5V - 0.11V - 4.242V)  
0.75A  
= 197mΩ  
Thermistor  
The AAT3680 checks battery temperature before  
starting the charge cycle, as well as during all  
stages of charging. This is accomplished by mon-  
itoring the voltage at the TS pin. Either a negative  
temperature coefficient thermistor (NTC) or posi-  
tive temperature coefficient thermistor (PTC) can  
be used because the AAT3680 checks to see that  
the voltage at TS is within a voltage window bound-  
ed by VTS1 and VTS2. Please see the equations  
below for specifying resistors:  
Select a P-channel power MOSFET with RDS(ON)  
lower than 197mΩ at VGS = -4.3V.  
In summary, select a P-channel MOSFET with ratings  
VDS ≥ 12V, RθJA ≤ 79°C/W and RDS(ON) ≤ 197mΩ at  
VGS = -4.3V in a SOT223 (or better thermal) package.  
Choosing a Sense Resistor  
The charging rate recommended by lithium-  
ion/polymer cell vendors is normally 1C, with a 2C  
absolute maximum rating. Charging at the highest  
recommended rate offers the advantage of short-  
ened charging time without decreasing the battery  
lifespan. This means that the suggested fast  
charge rate for a 500mAH battery pack is 500mA.  
The current sense resistor, RSENSE, programs the  
charge current according to the following equation:  
RT1 and RT2 for use with NTC Thermistor  
5 ⋅ RTH ⋅ RTC  
3 ⋅ (RTC - RTH)  
RT1  
RT2  
=
=
5 ⋅ RTH ⋅ RTC  
(2 ⋅ RTC) - (7 ⋅ RTH)  
(VP - VCSI  
)
RSENSE  
=
ICHARGE(REG)  
12  
3680.2006.03.1.6  
1...9101112131415...18

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