參數(shù)資料
型號(hào)： AAT3687IWP-4.2-1-T1
廠商： Advanced Analog Technology,lnc.
英文描述： Lithium-Ion/Polymer Battery Charger
中文描述： 鋰離子電池充電器
文件頁(yè)數(shù)： 13/22頁(yè)
文件大?。?/td> 526K
代理商： AAT3687IWP-4.2-1-T1
AAT3687
Lithium-Ion/Polymer Battery Charger
3687.2006.10.1.7
13
Figure 2: I
FASTCHARGE
vs. R
SET
.
Protection Circuitry
Programmable Watchdog Timer
The AAT3687 contains a watchdog timing circuit to
shut down charging functions in the event of a
defective 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 (AAT3687
and AAT3687-1 only) 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 additional
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 AAT3687 charge
control will shut down the device until the voltage
on the BAT pin drops below V
OVP
. The AAT3687
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 AAT3687 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 AAT3687 checks battery temperature before
starting the charge cycle, as well as during all
stages of charging. This is accomplished by moni-
toring the voltage at the TS pin. This system is
intended for use with negative temperature coeffi-
cient thermistors (NTC) which are typically inte-
grated into the battery package. Most of the com-
monly used NTC thermistors in battery packs are
Mode
Time
Trickle Charge (TC)
Time Out
Trickle Charge (TC) + Fast
Charge (CC) Time Out
Constant Voltage (VC)
Mode Time Out
25 minutes (AAT3687
(and AAT3687-1 only)
3 hours
3 hours
R
SET
(k
Ω
)
I
F
10
100
1000
10000
1
10
100
相關(guān)PDF資料
PDF描述
AAT3687IWP-4.2-2-T1 Lithium-Ion/Polymer Battery Charger
AAT3687IWP-4.2-T1 Lithium-Ion/Polymer Battery Charger
AAT3688 USB Port Lithium-Ion/Polymer Battery Charger
AAT3688IWP-4.2-T1 USB Port Lithium-Ion/Polymer Battery Charger
AAT3689 0.5A/1.0A USB Port/Adapter Lithium-Ion/Polymer Battery Charger
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AAT3688AIWP-4.2-DB1 制造商:Skyworks Solutions Inc 功能描述:AAT3688 Series USB Port Lithium-Ion/Polymer Battery Charger Evaluation Board
AAT3688AIWP-4.2-T1 制造商:Skyworks Solutions Inc 功能描述:Battery Management 1A USB Port LI-Ion Polymer Battery Chgr 制造商:Skyworks Solutions Inc 功能描述:POWER MANAGEMENT IC
AAT3688IWP-4.2-T1 制造商:SKYWORKS SOLUTIONS 功能描述:AAT3688 Series 5.5 V USB Port Lithium-Ion/Polymer Battery Charger - TDFN33-12 制造商:Skyworks Solutions Inc 功能描述:POWER MANAGEMENT IC
AAT3690IWP-4.2-T1 制造商:Advanced Analogic Tech 功能描述:AAT3690 Series 4 - 5.5 V 1A USB Port/Adapter Lithium-Ion/Polymer Battery Charger 制造商:SKYWORKS SOLUTIONS 功能描述:AAT3690 Series 4 - 5.5 V 1A USB Port/Adapter Lithium-Ion/Polymer Battery Charger 制造商:Skyworks Solutions Inc 功能描述:POWER MANAGEMENT IC
AAT3691IRN-4.2-T1 制造商:SKYWORKS SOLUTIONS 功能描述:AAT3691 Series 1.6 A 28 V Dual Input 1.6 A Linear Charger - TDFN-16
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

*
*
*