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参数资料
| 型号： | LTC4062EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER LI-ION 10-DFN |
| 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) |
LTC4062
APPLICATIO S I FOR ATIO
User-Selectable Charge Termination
Connecting the TIMER pin to V CC selects user-selectable
charge termination, in which all of the internal termination
When PROG and I DET are connected in this way, the full-
scale charge current, I CHG , is programmed with a different
equation:
features are disabled. The charge cycle continues indefi-
nitely until the charger is shut down through the EN pin.
The I DET pin programs the behavior of the CHRG output in
R PROG =
500 V
I CHG
, I CHG =
500 V
R PROG
the same manner as when using charge time termination.
If the I DET pin is not connected, the CHRG output remains
in its pull-down state until the charger is shut down.
With user-selectable charge termination, the SmartStart
feature is disabled; when the charger is powered on or
enabled, the LTC4062 automatically begins charging, re-
gardless of the battery voltage. Figure 5 describes charger
operation when user-selectable charge termination is used.
Programming C/10 Current Detection/Termination
In most cases, an external resistor, R DET , is needed to set
the charge current detection threshold, I DETECT . However,
when setting I DETECT to be 1/10th of I CHG , the I DET pin can
be connected directly to the PROG pin. This reduces the
component count, as shown in Figure 6.
500mA
Stability Considerations
The battery charger constant voltage mode feedback loop
is stable without any compensation provided a battery is
connected. However, a 1 μ F capacitor with a 1 ? series
resistor to GND is recommended at the BAT pin to reduce
noise when no battery is present.
When the charger is in constant current mode, the PROG
pin is in the feedback loop, not the battery. The constant
current stability is affected by the impedance at the PROG
pin. With no additional capacitance on the PROG pin, the
charger is stable with program resistor values as high as
10k ? ; however, additional capacitance on this node re-
duces the maximum allowed program resistor value.
Power Dissipation
When designing the battery charger circuit, it is not
V IN
R PROG
2k
R DET
2k
V CC BAT
C/5 LTC4062
PROG
I DET TIMER
GND
+
necessary to design for worst-case power dissipation
scenarios because the LTC4062 automatically reduces
the charge current during high power conditions. The
conditions that cause the LTC4062 to reduce charge
current through thermal feedback can be approximated
by considering the power dissipated in the IC. Most of the
500mA
power dissipation is generated from the internal charger
V IN
V CC BAT
C/5 LTC4062
PROG
+
MOSFET. Thus, the power dissipation is calculated to be
approximately:
R PROG
1k
I DET
TIMER
GND
P D = (V CC – V BAT ) ? I BAT
4062 F06
Figure 6. Two Circuits That Charge at 500mA
Full-Scale Current and Terminate at 50mA
P D is the power dissipated, V CC is the input supply voltage,
V BAT is the battery voltage and I BAT is the charge current.
The approximate ambient temperature at which the ther-
mal feedback begins to protect the IC is:
T A = 105 ° C – P D ? θ JA
T A = 105 ° C – (V CC – V BAT ) ? I BAT ? θ JA
4062fb
15
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相关代理商/技术参数 |
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| LTC4063 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Standalone Linear Li-lon Battery Charger with Thermistor Input |
| LTC4063EDD | 功能描述:IC BATT CHRGR LI-ION LDO 10DFN RoHS:否 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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| LTC4063EDD#TRPBF | 功能描述:IC BATT CHRGR LI-ION LDO 10DFN 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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