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參數(shù)資料
| 型號(hào)： | AAT3680IKS-4.2-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | Lithium-Ion Linear Battery Charge Controller |
| 中文描述： | 鋰離子線性電池充電控制器 |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大?。?/td> | 265K |
| 代理商： | AAT3680IKS-4.2-T1 |
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AAT3680
Lithium-Ion Linear Battery Charge Controller
3680.2003.4.0.91
13
Output Capacitor
The AAT3680 does not need an output capacitor for
stability of the device itself. However, a capacitor
connected between BAT and V
SS
will control the
output voltage when the AAT3680 is powered up
when no battery is connected. The AAT3680 can
become unstable if a high impedance load is placed
across the BAT pin to V
SS
. Such a case is possible
with aging Li-Ion battery cells. As cells age through
repeated charge and discharge cycles, the internal
impedance can rise over time. A10μF or larger out-
put capacitor will compensate for the adverse
effects of a high impedance load and assure device
stability over all operating conditions.
Operation Under No-Load
Under no-load conditions, that is when the
AAT3680 is powered with no battery connected
between the BAT pin and V
SS
, the output capacitor
is charged up very quickly by the trickle charge
control circuit to the BAT pin until the output reach-
es the recharge threshold (V
RCH
). At this point the
AAT3680 will drop into the sleep mode. The output
capacitor will discharge slowly by the capacitor's
own internal leakage until the voltage seen at the
BAT pin drops below the V
RCH
threshold. This
100mV cycle will continue at approximately 3Hz
with a 0.1μF capacitor connected. A larger capaci-
tor value will produce a slower voltage cycle. This
operation mode can be observed by viewing the
STAT LED blinking on and off at the rate estab-
lished by the C
OUT
value.
For Desk Top Charger applications where it might
not be desirable to have a "charger ready" blinking
LED, a large C
OUT
capacitor in the range of 100μF
or more would prevent the operation of this mode.
Reverse Current Blocking Diode
Bi-Polar Circuit Application
When using the AAT3680 with a PNP transistor, a
reverse-blocking diode is not required because
there is no current path from BAT to V
P
. However,
it is advisable to still place a blocking diode
between the bipolar transistor collector and the
BAT pin connection to the circuit output. In the
event where the input supply is interrupted or
removed during the constant current or constant
voltage phases of the charging cycle, the battery
under charge will discharge through the circuit
pass transistor rendering it impossible to turn off. If
the circuit is unable to turn off, the reverse leakage
will eventually discharge the battery. A blocking
diode will prevent this undesirable effect.
MOSFET Circuit Application
An reverse-blocking diode is generally required for
the circuit shown in Figure 5. For this application,
the blocking diode gives the system protection
from a shorted input, when the AAT3680 is used
with a P-Channel MOSFET. If there is no other pro-
tection in the system, a shorted input could dis-
charge the battery through the body diode of the
pass MOSFET. If a reverse-blocking diode is
added to the system, a device should be chosen
which can withstand the maximum constant- cur-
rent charge current at the maximum system ambi-
ent temperature.
Diode Selection
Typically, a Schottky diode is used in reverse cur-
rent blocking applications with the AAT3680. Other
lower cost rectifier type diodes may also be used to
save cost if sufficient input power supply head
room is available.
The blocking diode selection should based on mer-
its of the device forward voltage (V
F
), current rat-
ing, input supply level versus the maximum battery
charge voltage and cost.
First, one must determine what the minimum diode
forward voltage drop must be. Refer to the follow-
ing equation where:
V
IN(MIN)
= Minimum input supply level
V
BAT(MAX)
= Maximum battery charge voltage
required
V
F(TRAN)
= Pass transistor forward voltage drop
V
F(DIODE)
= Blocking diode forward voltage
V
IN(MIN)
= V
BAT(MAX)
+ V
F(TRAN)
+ V
F(DIODE)
Based on the maximum constant current charge
level set for the system, the next step is to determine
the minimum current rating and power handling
capacity for the blocking diode. The constant cur-
rent charge level itself will dictate what the minimum
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3680IKS-8.4-T1 | 制造商:Skyworks Solutions Inc 功能描述:AAT3680 Series 7 V Lithium-Ion/Polymer Linear Battery Charge Controller - MSOP-8 |
| AAT3681AIJS-4.1-5-T1 | 功能描述:電池管理 500mA USB Port/Adptr Li-Ion/Ply Batt Chgr 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 |
| AAT3681AIJS-4.1-T1 | 功能描述:電池管理 500mA USB Port/Adptr Li-Ion/Ply Batt Chgr 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 |
| AAT3681AIJS-4.2-1-T1 | 功能描述:IC BATT CHG LI-ION SC70JW-8 制造商:skyworks solutions inc. 系列:- 包裝:* 零件狀態(tài):上次購(gòu)買時(shí)間 電池化學(xué):鋰離子/聚合物 電池?cái)?shù):1 電流 - 充電:恒流 - 可編程 可編程特性:- 故障保護(hù):超溫，過(guò)壓，短路 充電電流 - 最大值:500mA 電池組電壓:4.2V 電壓 -?供電（最高）:7.5V 接口:USB 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:* 供應(yīng)商器件封裝:* 標(biāo)準(zhǔn)包裝:1 |
| AAT3681AIJS-4.2-2-T1 | 制造商:Skyworks Solutions Inc 功能描述:POWER MANAGEMENT IC |
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