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参数资料
| 型号： | LTC4096EDD#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | 3 X 3 MM, LEAD FREE, PLASTIC, MO-229WEED-2, DFN-10 |
| 文件页数： | 5/16页 |
| 文件大小： | 177K |
| 代理商： | LTC4096EDD#PBF |
LTC4096/LTC4096X
13
4096xf
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:
PD = (VIN – VBAT) IBAT
PD is the power dissipated, VIN is the input supply volt-
age (either DCIN or USBIN), VBAT is the battery voltage
and IBAT is the charge current. The approximate ambient
temperature at which the thermal feedback begins to
protect the IC is:
TA = 115°C – PD θJA
TA = 115°C – (VIN – VBAT) IBAT θJA
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
θJA is 40°C/W (see Thermal Considerations),
the ambient temperature at which the LTC4096 will begin
to reduce the charge current is approximately:
TA = 115°C – (5V – 3.3V) (800mA) 40°C/W
TA = 115°C – 1.36W 40°C/W = 115°C – 54.4°C
TA = 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:
I
CT
VV
BAT
A
IN
BAT
JA
=
°
105
–
(–
)
θ
Using the previous example with an ambient temperature
of 70°C, the charge current will be reduced to approxi-
mately:
I
CC
VV
C W
C
C A
ImA
BAT
=
°°
°
=
°
=
105
60
53 3
40
45
68
662
–
(– .
)
/
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.
APPLICATIONS INFORMATION
LTC4096
DCIN
USBIN
IUSB
IDC
BAT
ITERM
RISET
2k
1%
RITERM
1k
1%
WALL
ADAPTER
USB
PORT
1
F
1
F
+
500mA
4096 F03
GND
4.2V
1-CELL
Li-Ion
BATTERY
LTC4096
DCIN
USBIN
IUSB
IDC
RIDC
1.24k
1%
WALL
ADAPTER
USB
PORT
1
F
1
F
+
800mA (WALL)
500mA (USB)
4096 F04
GND
RIUSB
2k
1%
RITERM
1k
1%
4.2V
1-CELL
Li-Ion
BATTERY
BAT
ITERM
1k
PWR
CHRG
Figure 3. Dual Input Charger Circuit. The
Wall Adapter Charge Current and USB Charge
Current are Both Programmed to be 500mA
Figure 4. Full Featured Dual Input Charger Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4096X | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input Standalone Li-Ion Battery Chargers |
| LTC4096XEDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Input Standalone Li-Ion Battery Chargers |
| LTC4096XEDD#PBF | 功能描述:IC CHARGER LI-ION DL 10-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 |
| LTC4096XEDD#TRPBF | 功能描述:IC CHARGER LI-ION DL 10-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 |
| LTC4097 | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB/Wall Adapter Standalone Li-Ion/Polymer Battery Charger |
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