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| 型号： | LTC4096XEDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI-ION DL 10-DFN |
| 标准包装： | 121 |
| 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： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 管件 |
LTC4096/LTC4096X
APPLICATIONS INFORMATION
800mA (WALL)
WALL
ADAPTER
LTC4096
DCIN
BAT
500mA (USB)
WALL
ADAPTER
USB
PORT
1 μ F
1 μ F
R ISET
2k
1%
LTC4096
USBIN
IUSB
IDC ITERM
GND
DCIN BAT
500mA
+
R ITERM
1k
1%
4.2V
1-CELL
Li-Ion
BATTERY
USB
PORT
R IUSB
2k
1%
1 μ F
R IDC
1.24k
1%
1 μ F
USBIN
IUSB CHRG
IDC ITERM
GND
PWR
1k
R ITERM
1k
1%
+
4.2V
1-CELL
Li-Ion
BATTERY
I BAT =
I BAT =
=
4096 F03
Figure 3. Dual Input Charger Circuit. The
Wall Adapter Charge Current and USB Charge
Current are Both Programmed to be 500mA
Power Dissipation
When designing the battery charger circuit, it is not neces-
sary to design for worst-case power dissipation scenarios
because the LTC4096 automatically reduces the charge
current during high power conditions. The conditions
that cause the LTC4096 to reduce charge current through
thermal feedback can be approximated by considering the
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:
P D = (V IN – V BAT ) ? I BAT
PD is the power dissipated, V IN 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
4096 F04
Figure 4. Full Featured Dual Input Charger Circuit
T A = 115°C – (5V – 3.3V) ? (800mA) ? 40°C/W
T A = 115°C – 1.36W ? 40°C/W = 115°C – 54.4°C
T A = 60.6°C
The LTC4096 can be used above 60.6°C ambient, but
the charge current will be reduced from 800mA. The ap-
proximate current at a given ambient temperature can be
approximated by:
105 ° C – T A
( V IN – V BAT ) ? θ JA
Using the previous example with an ambient temperature
of 70°C, the charge current will be reduced to approxi-
mately:
105 ° C – 60 ° C 45 ° C
( 5 V – 3 . 3 V ) ? 40 ° C / W 68 ° C / A
protect the IC is:
I BAT
= 662 mA
T A = 115°C – P D ? θ JA
T A = 115°C – (V IN – V BAT ) ? I BAT ? θ JA
Example: An LTC4096 operating from a 5V wall adapter (on
the DCIN input) is programmed to supply 800mA full-scale
current to a discharged Li-Ion battery with a voltage of 3.3V.
Assuming θ JA is 40°C/W (see Thermal Considerations),
the ambient temperature at which the LTC4096 will begin
It is important to remember that LTC4096 applications do
not need to be designed for worst-case thermal conditions,
since the IC will automatically reduce power dissipation
when the junction temperature reaches approximately
115°C. Moreover a thermal shut down protection circuit
around 150°C safely prevents any damage putting LTC4096
into shut down mode.
to reduce the charge current is approximately:
4096xf
13
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相关代理商/技术参数 |
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| LTC4097EDDB#TRPBF | 功能描述:IC CHARGER LI-ION/POLY 12-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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