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參數(shù)資料
| 型號： | ISL6297 |
| 廠商： | Intersil Corporation |
| 英文描述： | Li-ion/Li Polymer Battery Charger |
| 中文描述： | Li-ion/Li聚合物電池充電器 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 432K |
| 代理商： | ISL6297 |
7
FN9215.0
September 27, 2005
Theory of Operation
The ISL6297 is based on the
Intersil Patent-pending
dual-
mode charging technology. This allows the ISL6297 to
function as a traditional linear charger when powered with a
voltage-source adapter. However, when powered with a
current-limited adapter, the charger minimizes the thermal
dissipation commonly seen in traditional linear chargers.
This dual-mode technology generates very low heat, which
enables the charger to be used in space-limited applications.
The ISL6297 charges a Lithium Ion battery using the
constant current (CC) and constant voltage (CV) profile
specified by battery cell manufacturers.
As a linear charger, the constant charge current I
REF
is
programmable up to 1.5A with an external resistor. The
constant charge voltage V
CH
is regulated by the ISL6297 at
4.2V with a 0.7% accuracy over the entire recommended
operating range.
The ISL6297 always preconditions the battery with 10% of
the programmed current at the beginning of a charge cycle,
until the battery voltage is verified to be above the minimum
fast charge voltage, V
MIN
. This low-current preconditioning
charge mode is named trickle mode.
A thermal-foldback feature removes the thermal concern
typically seen in linear chargers. The charger reduces the
charge current automatically as the IC internal temperature
rises above 100
o
C to prevent further temperature rise. The
thermal-foldback feature guarantees safe operation when
the printed circuit board (PCB) is space limited for thermal
dissipation.
Figure 1 shows the typical charge curves in a traditional
linear charger powered with a constant-voltage adapter. The
power dissipation P
CH
is given by the following equations:
(EQ. 1)
where I
CHARGE
is the charge current. The maximum power
dissipation occurs at the beginning of the CC mode. The
maximum power the IC is capable of dissipating is
dependent on the thermal impedance of the printed-circuit
board (PCB). Figure 1 shows, with dotted lines, two cases in
which the charge currents are limited by the maximum power
dissipation capability due to the thermal foldback.
To take advantage of the low-heat feature of the ISL6297, a
current-limited AC/DC converter is required as the power
supply to the charger. The current-limited supply has the I-V
characteristics shown in Figure 2. The supply is a DC source
before the load current reaches the limited current I
LIM
.
Once the current limit is reached, the supply current cannot
increase further; instead, the supply voltage falls. The
current-limited supply is a voltage source with an equivalent
output impedance or a current source, depending on its
operating region, as shown in Figure 2.
In this mode of operation, the constant current is determined
by the current limit I
LIM
of the supply during the constant-
current charge mode. To ensure dual-mode operation, the
current protection level set by the ISL6297 I
REF
pin should
be higher than I
LIM
. In the constant-voltage charge mode,
the battery voltage is regulated at 4.2V. When the battery
voltage is below the specified V
MIN
voltage, the charger
preconditions the battery using trickle charge mode.
Figure 3 shows the typical waveforms in a charge cycle of
the dual mode operation. When the battery voltage is below
V
MIN
, the trickle charge mode is in effect. Since the charge
current is much less than the I
LIM
, the AC/DC converter
operates in the voltage source region. Once the battery
voltage exceeds V
MIN
, the charger fully turns on the internal
P-channel power MOSFET. The AC/DC converter operates
FIGURE 1. TYPICAL CHARGE CURVES USING A
CONSTANT-VOLTAGE ADAPTER
V
CH
V
MIN
V
IN
I
REF
I
REF
/10
P
1
P
2
P
3
Trickle
Mode
Constant Current
Mode
Constant Voltage
Mode
Inhibit
TIMEOUT
Input Voltage
Battery Voltage
Charge Current
Power Dissipation
P
CH
V
IN
-V
BAT
(
)
I
CHARGE
×
=
FIGURE 2. THE I-V CHARACTERISTICS OF THE CURRENT-
LIMITED AC/DC CONVERTER
V
NL
V
FL
I
LIM
r
O
V
NL
I
LIM
r
O
= (V
NL
- V
FL
)/I
LIM
A
B
C
ISL6297
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL6297_07 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Li-ion/Li Polymer Battery Charger |
| ISL6297CR | 功能描述:IC BATT CHRGR 4.2V LI-ION 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| ISL6297CR-T | 功能描述:IC BATT CHRGR 4.2V LI-ION 16-QFN RoHS:否 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT |
| ISL6297CRZ | 功能描述:IC CHARGER LI-ION POLYMER 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 功能:電池監(jiān)控器 電池化學(xué):堿性，鋰離子，鎳鎘，鎳金屬氫化物 電源電壓:1 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:帶卷 (TR) |
| ISL6297CRZ-T | 功能描述:IC CHARGER LI-ION POLYMER 16-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 其它有關(guān)文件:STC3100 View All Specifications 特色產(chǎn)品:STC3100 - Battery Monitor IC 標(biāo)準(zhǔn)包裝:4,000 系列:- 功能:燃料，電量檢測計/監(jiān)控器 電池化學(xué):鋰離子（Li-Ion） 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:8-MiniSO 包裝:帶卷 (TR) 其它名稱:497-10526-2 |
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