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参数资料
| 型号： | LTC4066EPF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 24/28页 |
| 文件大小： | 0K |
| 描述： | IC USB POWER MANAGER 24-UTQFN |
| 标准包装： | 2,500 |
| 功能： | 电源管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 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： | 24-UFQFN 裸露焊盘 |
| 供应商设备封装： | 24-UTQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
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LTC4066/LTC4066-1
APPLICATIONS INFORMATION
R 1 = R 2 ? ? TH
?
?
– 1 ?
R 1 = 10 k ? ?
– 1 ? = 10 k ? 2 . 67 = 26 . 7 k
V HYST ( Adapter ) ≈ 30 mV ? ? 1 +
? ≈ 110 . 1 mV
Consider an example where the V TH (Adapter) is to be set
somewhere around 4.5V. Resistance on the WALL pin
should be kept relatively low (~10k) in order to prevent
false tripping of the wall comparator due to leakages as-
sociated with the switching element used to connect the
adapter to OUT. Pick R2 to be 10k and solve for R1:
? V ( Adapter ) ?
V WALL
? 4 . 5 V ?
? 1 . 225 V ?
The nearest 1% resistor is 26.7k. Therefore, R1 = 26.7k
and the rising trip point should be 4.50V.
? 26 . 7 k ?
? 10 k ?
However, the approximate ambient temperature at which
the thermal feedback begins to protect the IC is:
T A = 105°C – P D ? θ JA
T A = 105°C – (V OUT – V BAT ) ? I BAT ? θ JA
Example: Consider an LTC4066/LTC4066-1 operating from
a wall adapter with 5V at V OUT providing 0.8A to a 3V
Li-Ion battery. The ambient temperature above which the
LTC4066/LTC4066-1 will begin to reduce the 0.8A charge
current, is approximately:
T A = 105°C – (5V – 3V) ? 0.8A ? 37°C/W
T A = 105°C – 1.6W ? 37°C/W = 105°C – 59°C = 46°C
The LTC4066/LTC4066-1 can be used above 46°C, but the
charge current will be reduced below 0.8A. The charge
current at a given ambient temperature can be approxi-
( V OUT BAT ) ? θ JA
The hysteresis is going to be approximately 110mV for
this example.
Power Dissipation
mated by:
I BAT =
105 ° C – T A
– V
I BAT =
=
= 0 . 675 A
The conditions that cause the LTC4066/LTC4066-1 to
reduce charge current due to the thermal protection
feedback can be approximated by considering the power
dissipated in the part. For high charge currents and a wall
adapter applied to V OUT , the LTC4066/LTC4066-1 power
dissipation is approximately:
P D = (V OUT – V BAT ) ? I BAT
where P D is the power dissipated, V OUT is the supply
voltage, V BAT is the battery voltage and I BAT is the battery
charge current. It is not necessary to perform any worst-
case power dissipation scenarios because the LTC4066/
LTC4066-1 will automatically reduce the charge current
to maintain the die temperature at approximately 105°C.
Consider the above example with an ambient tem-
perature of 55°C. The charge current will be reduced to
approximately:
105 ° C – 55 ° C 50 ° C
( 5 V – 3 V ) ? 37 ° C / W 74 ° C / A
Board Layout Considerations
In order to be able to deliver maximum charge current
under all conditions, it is critical that the Exposed Pad
on the backside of the LTC4066/LTC4066-1 package is
soldered to the board. Correctly soldered to a 2500mm 2
double-sided 1oz. copper board, the LTC4066/LTC4066-1
has a thermal resistance of approximately 37°C/W. Failure
4066fc
24
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| LTC4066EUF#PBF | 功能描述:IC USB POWER MANAGER 24-QFN 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 |
| LTC4066EUF#TRPBF | 功能描述:IC USB POWER MANAGER 24-QFN 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 |
| LTC4066EUF-1#PBF | 功能描述:IC USB POWER MANAGER 24-QFN 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 |
| LTC4066EUF-1#TRPBF | 功能描述:IC USB POWER MANAGER 24-QFN 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 |
| LTC4067 | 制造商:LINER 制造商全称:Linear Technology 功能描述:USB Power Manager with OVP and Li-Ion/Polymer Charger |
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