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参数资料
| 型号： | ISL6292-2CR4Z |
| 厂商： | INTERSIL CORP |
| 元件分类： | 电源管理 |
| 英文描述： | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset 14-SOIC -40 to 85 |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC16 |
| 封装： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, MO-220VGGC, QFN-16 |
| 文件页数： | 12/19页 |
| 文件大小： | 647K |
| 代理商： | ISL6292-2CR4Z |
12
FN9105.6
July 25, 2005
End-of-Charge (EOC) Current
The end-of-charge current I
MIN
sets the level at which the
charger starts to indicate the end of the charge with the
STATUS pin, as shown in Figure 19. The charger actually
does not terminate charging until the end of the TIMEOUT,
as described in the Total Charge Time section. The I
MIN
is
set in two ways, by connecting a resistor between the IMIN
pin and ground, or by connecting the IMIN pin to the V2P8
pin. When programming with the resistor, the I
MIN
is set in
the equation below.
(EQ. 6)
where R
IMIN
is the resistor connected between the IMIN pin
and the ground. When connected to the V2P8 pin, the I
MIN
is set to 1/10 of I
REF
, except when the IREF pin is shorted to
GND. Under this exception, I
MIN
is 5mA. For the ISL6292 in
the 3X3 DFN package, the IMIN pin is bonded internally to
V2P8.
Charge Current Thermal Foldback
Over-heating is always a concern in a linear charger. The
maximum power dissipation usually occurs at the beginning
of a charge cycle when the battery voltage is at its minimum
but the charge current is at its maximum. The charge current
thermal foldback function in the ISL6292 frees users from
the over-heating concern.
Figure 20 shows the current signals at the summing node of
the current error amplifier CA in the Block Diagram. I
R
is the
reference. I
T
is the current from the Temperature Monitoring
block. The I
T
has no impact on the charge current until the
internal temperature reaches approximately 100°C; then I
T
rises at a rate of 1
μ
A/°C. When I
T
rises, the current control
loop forces the sensed current I
SEN
to reduce at the same
rate. As a mirrored current, the charge current is 100,000
times that of the sensed current and reduces at a rate of
100mA/°C. For a charger with the constant charge current
set at 1A, the charge current is reduced to zero when the
internal temperature rises to 110°C. The actual charge
current settles between 100°C to 110°C.
Usually the charge current should not drop below I
MIN
because of the thermal foldback. For some extreme cases if
that does happen, the charger does not indicate end-of-
charge unless the battery voltage is already above the
recharge threshold.
2.8V Bias Voltage
The ISL6292 provides a 2.8V voltage for biasing the internal
control and logic circuit. This voltage is also available for
external circuits such as the NTC thermistor circuit. The
maximum allowed external load is 2mA.
NTC Thermistor
The ISL6292 uses two comparators (CP2 and CP3) to form a
window comparator, as shown in Figure 22.
When the TEMP
pin voltage is “out of the window,” determined by the V
TMIN
and V
TMAX
, the ISL6292 stops charging and indicates a fault
condition. When the temperature returns to the set range, the
charger re-starts a charge cycle. The two MOSFETs, Q1 and
Q2, produce hysteresis for both upper and lower thresholds.
The temperature window is shown in Figure 21.
I
MIN
10000
V
IMIN
----------------
IMIN
R
4
×
10
A
( )
=
=
FIGURE 20. CURRENT SIGNALS AT THE AMPLIFIER CA INPUT
Temperature
100
O
C
I
R
I
T
I
SEN
FIGURE 21. 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
(0.35V)
V
TMAX+
(0.406V)
+
-
+
-
V2P8
TEMP
GND
2.8V
R2
60K
R3
75K
R4
25K
R5
4K
Q1
Q2
CP2
CP3
Under
Temp
Over
Temp
ISL6292
R
U
To TEMP Pin
V
TMIN
V
TMAX
R
T
+
-
R1
40K
Battery
Removal
CP1
V
RMV
FIGURE 22. THE INTERNAL AND EXTERNAL CIRCUIT FOR
THE NTC INTERFACE
ISL6292
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PDF描述 |
|---|---|
| ISL6292-2CR5 | Li-ion/Li Polymer Battery Charger |
| ISL6292-2CR5-T | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset 14-SSOP -40 to 85 |
| ISL6292-2CR5Z | Dual Positive-Edge-Triggered D-Type Flip-Flops With Clear and Preset 14-SSOP -40 to 85 |
| ISL6292 | Li-ion/Li Polymer Battery Charger |
| ISL6292-1CR3Z | Octal D-Type Edge-Triggered Flip-Flops with 3-State Outputs 20-PDIP -40 to 85 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6292-2CR4Z-T | 功能描述:电池管理 LD VER OF ISL6292-2CR4-T RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| ISL6292-2CR5 | 功能描述:IC BATT CHRGR LI-ION 4.2V 16-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| ISL6292-2CR5-T | 功能描述:IC BATT CHRGR LI-ION 4.2V 16-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| ISL6292-2CR5Z | 功能描述:电池管理 LD VER OF ISL6292-2CR5 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| ISL6292-2CR5Z-T | 功能描述:电池管理 LD VER OF ISL6292-2CR5-T RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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