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参数资料
| 型号： | LTC4075EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARG BATT LI-ON USB 10DFN |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 4.3 V ~ 8 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： | 带卷 (TR) |
LTC4075/LTC4075X
APPLICATIO S I FOR ATIO
Using a Single Charge Current Program Resistor
The LTC4075 can program the wall adapter charge current
and USB charge current independently using two program
In this circuit, the programmed charge current from both the
wall adapter supply is the same value as the programmed
charge current from the USB supply:
resistors, R IDC and R IUSB . Figure 2 shows a charger circuit
that sets the wall adapter charge current to 800mA and
the USB charge current to 500mA.
I CHRG ? DC = I CHRG ? USB =
1000V
R ISET
WALL
ADAPTER
LTC4075
DCIN
BAT
800mA (WALL)
500mA (USB)
Stability Considerations
The constant-voltage mode feedback loop is stable without
USB
PORT
1 μ F
1 μ F
USBIN
IUSB
+
any compensation provided a battery is connected to the
charger output. However, a 1μF capacitor with a 1 Ω series
R IUSB
2k
1%
R IDC
1.24k
1%
IDC
ITERM
GND
R ITERM
1k
1%
resistor is recommended at the BAT pin to keep the ripple
voltage low when the battery is disconnected.
4075 F02
Figure 2. Full Featured Dual Input Charger Circuit
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 3 shows a charger circuit that uses one
charge current program resistor.
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 char-
ger is stable with program resistor values as high as 20k
(I CHRG = 50mA); however, additional capacitance on these
nodes reduces the maximum allowed program resistor.
Power Dissipation
WALL
ADAPTER
LTC4075
DCIN
BAT
500mA
When designing the battery charger circuit, it is not neces-
sary to design for worst-case power dissipation scenarios
USB
PORT
1 μ F
1 μ F
R ISET
2k
1%
USBIN
IUSB
IDC
ITERM
GND
+
R ITERM
1k
1%
because the LTC4075 automatically reduces the charge
current during high power conditions. The conditions
that cause the LTC4075 to reduce charge current through
thermal feedback can be approximated by considering the
Figure 3. Dual Input Charger Circuit. The Wall
Adapter Charge Current and USB Charge Current
are Both Programmed to be 500mA
4075 F03
power dissipated in the IC. Most of the power dissipation
is generated from the internal charger MOSFET. Thus, the
power dissipation is calculated to be:
P D = (V IN – V BAT ) ? I BAT
4075Xfa
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4075HVX | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Dual Input Li-Ion/Polymer Battery Charger |
| LTC4075HVXEDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Voltage Dual Input Li-Ion/Polymer Battery Charger |
| LTC4075HVXEDD#PBF | 功能描述:IC CHARGER LI-ION 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 |
| LTC4075HVXEDD#PBF | 制造商:Linear Technology 功能描述:BATT CHARGER LI ON DUAL 10DFN 制造商:Linear Technology 功能描述:BATT CHARGER, LI ON, DUAL, 10DFN |
| LTC4075HVXEDD#TRPBF | 功能描述:IC CHARGER LI-ION 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 |
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