參數(shù)資料
型號(hào)： AAT3697
廠商： Advanced Analog Technology,lnc.
英文描述： 2A Lithium-Ion/Polymer Battery Charger
中文描述： 第2A鋰離子電池充電器
文件頁(yè)數(shù)： 13/22頁(yè)
文件大?。?/td> 1269K
代理商： AAT3697
AAT3697
2A Lithium-Ion/Polymer Battery Charger
3697.2007.02.1.1
13
Protection Circuitry
Programmable Watchdog Timer
The AAT3697 contains a watchdog timing circuit to
shut down charging functions in the event of a defec-
tive battery cell not accepting a charge over a preset
period of time. Typically, a 0.1
μ
F ceramic capacitor
is connected between the CT pin and ground. When
a 0.1
μ
F ceramic capacitor is used, the device will
time out a shutdown condition if the trickle charge
mode exceeds 25 minutes and a combined trickle
charge plus fast charge mode of 3 hours. When the
device transitions to the constant voltage mode, the
timing counter is reset and will time out after an addi-
tional 3 hours if the charge current does not drop to
the charge termination level.
Table 2: Summary for a 0.1
μ
F Ceramic
Capacitor Used for the Timing Capacitor.
The CT pin is driven by a constant current source
and will provide a linear response to increases in the
timing capacitor value. Thus, if the timing capacitor
were to be doubled from the nominal 0.1
μ
F value,
the time-out periods would be doubled.
If the programmable watchdog timer function is not
needed, it can be disabled by terminating the CT
pin to ground. The CT pin should not be left float-
ing or un-terminated, as this will cause errors in the
internal timing control circuit.
The constant current provided to charge the timing
capacitor is very small, and this pin is susceptible
to noise and changes in capacitance value.
Therefore, the timing capacitor should be physical-
ly located on the printed circuit board layout as
close as possible to the CT pin. Since the accura-
cy of the internal timer is dominated by the capaci-
tance value, a 10% tolerance or better ceramic
capacitor is recommended. Ceramic capacitor
materials, such as X7R and X5R types, are a good
choice for this application.
Over-Voltage Protection
An over-voltage event is defined as a condition
where the voltage on the BAT pin exceeds the
maximum battery charge voltage and is set by the
over-voltage protection threshold (V
OVP
). If an
over-voltage condition occurs, the AAT3697 charge
control will shut down the device until the voltage
on the BAT pin drops below V
OVP
. The AAT3697
will resume normal charging operation after the
over-voltage condition is removed. During an over-
voltage event, the STAT LEDs will report a system
fault, and the actual fault condition can be read via
the DATA pin signal.
Over-Temperature Shutdown
The AAT3697 has a thermal protection control cir-
cuit which will shut down charging functions should
the internal die temperature exceed the preset
thermal limit threshold.
Battery Temperature Fault Monitoring
In the event of a battery over-temperature condi-
tion, the charge control will turn off the internal pass
device and report a battery temperature fault on the
DATA pin function. The STAT LEDs will also dis-
play a system fault. After the system recovers from
a temperature fault, the device will resume charg-
ing operation.
The AAT3697 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 AAT3697 checks to see that
the voltage at TS is within a voltage window bound-
ed by V
TS1
and V
TS2
. Please see the equations
below for specifying resistors:
R
T1
and R
T2
for use with
NTC
Thermistor
Eq. 2:
5
R
TH
R
TC
3
(R
TC
- R
TH
)
5
R
TH
R
TC
(2
R
TC
) - (7
R
TH
)
R
T1
=
R
T2
=
Mode
Time
Trickle Charge (TC) Time Out
Trickle Charge (TC) +
Fast Charge (CC) Time Out
Constant Voltage (VC) Mode
Time Out
25 minutes
3 hours
3 hours
相關(guān)PDF資料
PDF描述
AAT3697IWP-4.2-T1 2A Lithium-Ion/Polymer Battery Charger
AAT4280AIJS-1-T1 Slew Rate Controlled Load Switch
AAT4280AIJS-2-T1 Slew Rate Controlled Load Switch
AAT4280AIJS-3-T1 Slew Rate Controlled Load Switch
AAT4296 Five/Six Channel Push/Pull I/O Expander
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AAT3697IWP-4.2-T1 制造商:Advanced Analogic Tech 功能描述:AAT3697 Series 5.5 V 2 A Lithium-Ion/Polymer Battery Charger - TDFN-12 制造商:SKYWORKS SOLUTIONS 功能描述:AAT3697 Series 5.5 V 2 A Lithium-Ion/Polymer Battery Charger - TDFN-12 制造商:Skyworks Solutions Inc 功能描述:POWER MANAGEMENT IC
AAT3698IWO-4.2-1-T1 功能描述:電池管理 1.6A Linear Li-Ion Battery Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
AAT3698IWO-4.2-2-T1 功能描述:電池管理 1.6A Linear Li-Ion Battery Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
AAT3783AIRN-4.2-DB1 制造商:SKYWORKS SOLUTIONS 功能描述:AAT3783 Series 1 A Linear Li-Ion/Polymer Battery Charger Evaluation Board
AAT3783AIRN-4.2-T1 制造商:Skyworks Solutions Inc 功能描述:IC CHARGER LI-ION/POLY 制造商:SKYWORKS SOLUTIONS 功能描述:AAT3783 Series 7.5 V 1-A Linear Li-Ion/Polymer Battery Charger - TDFN33-16 制造商:Skyworks Solutions Inc 功能描述:POWER MANAGEMENT IC
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*