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| 型号： | LTC4097EDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION/POLY 12-DFN |
| 标准包装： | 1 |
| 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： | 4.25 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN-EP（3x2） |
| 包装： | 标准包装 |
| 产品目录页面： | 1341 (CN2011-ZH PDF) |
| 其它名称： | LTC4097EDDB#TRMPBFDKR |
LTC4097
APPLICATIONS INFORMATION
Using a Single Charge Current Program Resistor
In applications where the programmed wall adapter charge
current and USB charge current are the same, a single
program resistor can be used to set both charge currents.
Figure 2 shows a charger circuit that uses one charge cur-
rent program resistor. In this circuit, one resistor programs
the same charge current for each input supply.
Power Dissipation
When designing the battery charger circuit, it is not neces-
sary to design for worst-case power dissipation scenarios
because the LTC4097 automatically reduces the charge
current during high power conditions. The conditions
that cause the LTC4097 to reduce charge current through
thermal feedback can be approximated by considering the
I CHRG ( DC ) = I CHRG ( USB ) =
1000 V
R SET
power dissipated in the IC. Most of the power dissipation
is generated from the internal MOSFET pass device. Thus,
the power dissipation is calculated to be:
The LTC4097 can also program the wall adapter charge
currentandUSBchargecurrentindependentlyusingtwo
program resistors, R IDC and R IUSB . Figure 3 shows a
charger circuit that sets the wall adapter charge current
to 800mA and the USB charge current to 500mA.
Stability Considerations
The constant-voltage mode feedback loop is stable without
any compensation provided a battery is connected to the
charger output. However, a 4.7μF capacitor with a 1 Ω series
resistor is recommended at the BAT pin to keep the ripple
voltage low when the battery is disconnected. When the
charger is in constant-current mode, the charge current
program pin (IDC or IUSB) is in the feedback loop, not the
battery. The constant-current mode stability is affected by
the impedance at the charge current program pin. With no
additional capacitance on this pin, the charger is stable
with program resistor values as high as 20K Ω (I CHRG =
50mA); however, additional capacitance on these nodes
reduces the maximum allowed program resistor.
100mA
P D = (V CC – V BAT ) ? I BAT
P D is the power dissipated, V CC is the input supply volt-
age (either DCIN or USBIN), V BAT is the battery voltage
and I BAT is the charge current. The approximate ambient
temperature at which the thermal feedback begins to
protect the IC is:
T A = 115°C – P D ? θ JA
T A = 115°C – (V CC – V BAT ) ? I BAT ? θ JA
Example: An LTC4097 operating from a 5V USB adapter
(on the USBIN input) is programmed to supply 500mA
full-scale current to a discharged Li-Ion battery with a
voltage of 3.3V. Assuming θ JA is 60°C/W (see Thermal
Considerations), the ambient temperature at which the
LTC4097 will begin to reduce the charge current is ap-
proximately:
T A = 115°C – (5V – 3.3V) ? (500mA) ? 60°C/W
T A = 115°C – 0.85W ? 60°C/W = 115°C – 51°C
T A = 64°C
800mA (WALL)
R NTC
100k
WALL
ADAPTER
USB
PORT
1 μ F
1 μ F
R ISET
2k
1%
LTC4097
DCIN BAT
USBIN HPWR
IUSB
IDC ITERM
GND
(USB, HPWR = LOW)
500mA
4.2V
+ 1-CELL
Li-Ion
BATTERY
R ITERM
2k
1%
WALL
ADAPTER
USB
PORT
1 μ F
R IUSB
2k
R IDC
1.24k
1 μ F
LTC4097
DCIN BAT
USBIN VNTC
HPWR
NTC
IUSB CHRG
IDC ITERM
GND
R NTCBIAS
100k
R ITERM
2k
100mA/500mA (USB)
1k
4.2V
+ 1-CELL
Li-Ion
BATTERY
Figure 2. Dual Input Charger Circuit. The
4097 F02
1%
1%
1%
4097 F03
Wall Adapter Charge Current and USB Charge
Current are Both Programmed to be 500mA
Figure 3. Full Featured Dual Input Charger Circuit
4097f
15
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| LTC4098EPDC#PBF | 功能描述:IC CHARGER USB COMP 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:Bat-Track™, PowerPath™ 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 |
| LTC4098EPDC#TRPBF | 功能描述:IC CHARGER USB COMP 20-UTQFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:Bat-Track™, PowerPath™ 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 |
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