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參數(shù)資料
| 型號(hào)： | ISL6291-1CRZ |
| 廠商： | INTERSIL CORP |
| 元件分類(lèi)： | 電源管理 |
| 英文描述： | Li-ion/Li Polymer Linear Battery Charger |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封裝： | 5 X 5 MM, THERMALLY ENHANCED, LEAD FREE, PLASTIC, MO-220VHHB, QFN-16 |
| 文件頁(yè)數(shù)： | 9/11頁(yè) |
| 文件大?。?/td> | 357K |
| 代理商： | ISL6291-1CRZ |
9
FN9102.2
May 2, 2005
Charge Termination Voltage Regulation
As the battery voltage rises to the 4.1V or 4.2V termination
voltage, the voltage amplifier starts to output positive voltage
and to source current. This current partially cancels the
current of the reference current I
R
to reduce the charge
current. If the battery voltage increases further due to the
charging, the voltage amplifier increases its output current to
reduce the equivalent reference current. As a result, after the
battery voltage reaches the termination voltage, the charge
current starts to decrease.
As the charging current drops to the end-of-charge current
level programmed by the IMIN pin, the charge stops. The
large voltage control loop gain guarantees that the battery
voltage is regulated within the 1% error specification.
Internal Thermal Management
The temperature rise of a linear charger is always a concern
in real applications. The temperature rise is caused by the
power dissipation of the charger. Maximum power
dissipation occurs when the battery is charged in the
constant current mode. The advanced thermal management
function of the ISL6291 frees users from the temperature
rise concern. The ISL6291 adopts a current-foldback
technique against the temperature rise. Under normal
operation, the ISL6291 charges the battery with the
programmed I
REF
. If the internal thermal monitoring circuit
detects 100°C temperature in the IC, it starts to reduce the
charge current to prevent further temperature rise. The gain
for the current-foldback is 40mA/°C (or 0.4
μ
A°C for the
reference current I
R
) after the internal temperature reaches
100°C; therefore, for a charger with the constant charge
current set at 1A, the charge current is reduced to zero when
the internal temperature rises to 125°C. The actual internal
temperature should settle between 100°C to 125°C,
depending on the operating conditions, if the temperature
does rise above 100°
C
.
Battery Pack Temperature Monitoring
The ISL6291 uses two comparators to form a window
comparator. Figure 3 shows the internal circuit. When the
TEMP pin voltage is “out of the window,” as determined by
the V
TMIN
and V
TMAX
, the charging is stopped. The two
MOSFETs, Q1 and Q2, produce hysteresis for both upper
and lower threshold. Figure 4 shows all the critical voltage
levels and the output of the two comparators versus the
TEMP pin voltage.
The external thermistor circuit is shown in Figure 3. The NTC
thermistor R
T
requires a pull-up resistor R
U
to form a
resistive divider. R
U
should be pulled up to the 2.8V V2P8
pin. Assume the resistance of the NTC thermistor is R
TH
at
the high temperature limit, and is R
TL
at the low limit. It can
be shown that:
Select an NTC thermistor whose resistance value satisfies
the above equation. A curve-1 NTC thermistor from Vishay is
a good candidate for this application. If a thermistor does not
meet this requirement, using a resistor in parallel or series
with the thermistor may solve the problem. Once the
thermistor is selected, the pull-up resistor should be chosen
as:
If a parallel or series resistor is used, the R
TL
value is the
combined value at the low temperature limit. The
temperature hysteresis can be calculated once the thermistor
is selected. The typical hysteresis is about 3°C to 5°C.
R
TL
9 R
TH
=
R
U
R
TL
=
FIGURE 3. THE INTERNAL AND EXTERNAL CIRCUIT FOR THE
BATTERY PACK TEMPERATURE MONITORING
+
-
+
-
V2P8
TEMP
GND
2.8V
R1
100K
R2
75K
R3
5K
R4
20K
R5
4K
Q1
Q2
CP1
CP2
Under
Temp
Over
Temp
ISL6291
R
U
To TEMP Pin
V
TMIN
V
TMAX
R
T
FIGURE 4. CRITICAL VOLTAGE LEVELS FOR TEMP PIN
2.8V
V
TMIN
(1.4V)
0V
Under
Temp
Over
Temp
TEMP
Pin
Voltage
V
TMIN-
(1.2V)
V
TMAX
(0.28V)
V
TMAX+
(0.33V)
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| ISL6291-1CRZ-T | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-SOIC -40 to 85 |
| ISL6291-2CR | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-SOIC -40 to 85 |
| ISL6291-2CR-T | Li-ion/Li Polymer Linear Battery Charger |
| ISL6291-2CRZ | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-SOIC -40 to 85 |
| ISL6291-2CRZ-T | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-SOIC -40 to 85 |
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| ISL6291-1CRZ-T | 功能描述:IC BATT CHRGR LI-ION 4.1V 16-QFN RoHS:是 類(lèi)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(lèi)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) |
| ISL62912CR | 制造商:Intersil Corporation 功能描述: |
| ISL6291-2CR | 功能描述:IC CHARGER LI-ION 4.2V 16-QFN RoHS:否 類(lèi)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(lèi)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(yè)面:669 (CN2011-ZH PDF) 其它名稱(chēng):MCP73831T-2ACI/OTCT |
| ISL6291-2CR-T | 功能描述:IC BATT CHRGR LI-ION 4.2V 16-QFN RoHS:否 類(lèi)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(lèi)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(yè)面:669 (CN2011-ZH PDF) 其它名稱(chēng):MCP73831T-2ACI/OTCT |
| ISL6291-2CRTR5155 | 制造商:INTERSIL 制造商全稱(chēng):Intersil Corporation 功能描述:Li-ion/Li Polymer Linear Battery Charger |
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