参数资料
| 型号： | NCP1835BMNR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHARGER LI-ION 10-DFN |
| 产品变化通告： | Product Discontinuation 30/Sept/2011 |
| 标准包装： | 3,000 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 2.8 V ~ 6.5 V |
| 工作温度： | -20°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 带卷 (TR) |
NCP1835B
Charging with Constant Voltage Adapters or Current
Limited Adapters
The NCP1835B can be powered from two types of
regulated adapters: a traditional constant voltage type or a
current limited type. Figure 19 illustrates the operation of
the linear charger powered with a standard constant voltage
adapter. The power dissipation in the linear charger is:
the charge current which limits the power dissipation to the
sustained level P2. Figure 19 shows this.
Using the adapter ’s current limit can provide better
thermal performance than the above example. A current
limited adapter operates as a constant voltage adapter
before the charge current reaches the current limit. I LIM
must be less than the programmed full charge current
Pdis + (VCC * VBAT)
ICHG
(eq. 3)
I FCHG . Once the current limit is reached, the adapter will
The maximum power dissipation P1 happens at the
beginning of a full current charge, since this is the point that
the power supply and the battery voltage have the largest
difference. As the battery voltage rises during charging, the
power dissipation drops. After entering the constant
voltage mode, the power dissipation drops further due to
the decreasing charge current. The maximum power that
the linear charger can dissipate is dependent on the thermal
resistance of the device. In case the device can not handle
the maximum power P1, the thermal foldback loop reduces
source the current limit I LIM while its output voltage will
drop to follow the battery voltage. If the application uses
the adapter to power its systems while the battery is being
charged, this drooping voltage can be an issue.
The worst case power dissipation with a current limited
adapter occurs at the beginning of the constant voltage
mode, which is shown at point P3 in Figure 20. If P3 is
higher than P2, the maximum power dissipation that the
charger can handle, then the thermal foldback function will
be activated.
Trickle
Charge
CC
Charge
CV
Charge
Inhibit
Trickle
Charge
CC
Charge
CV
Charge
Inhibit
V in
V in
V BAT
V REG
Time
V BAT
V REG
Time
V PC
V PC
I charge
I FCHG
Time
I charge
I FCHG
Time
I LIM
P dis
I PC
P1
Time
P dis
I PC
Time
P2
P3
0
Time
0
Time
Figure 19. Typical Charge Curves with a Constant
Voltage Adapter
PCB Layout Recommendations
The recommended footprint for the 3x3 mm DFN
package is included on the Package Dimension page. It is
critical that the exposed metal pad is properly soldered to
the ground copper area and then connected to a ground
plane through thermal vias. The maximum recommended
thermal via diameter is 12 mils (0.305 mm). Limited by the
size of the pad, six thermal vias should allow for proper
thermal regulation without sacrificing too much copper
area within the pad. The copper pad is the primary heatsink
and should be connected to as much top layer metal as
possible to minimize the thermal impedance. Figure 21
illustrates graphically the recommended connection for the
Figure 20. Typical Charge Curves with a Current
Limited Adapter
GND
Figure 21. Recommended Footprint
exposed pad with vias.
http://onsemi.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| NCP1835MN20R2 | 功能描述:电池管理 1A Max Single Cell RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| NCP1835MN20R2G | 功能描述:电池管理 1A Max Single Cell Lithium-Ion Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| NCP1835MN24R2 | 功能描述:电池管理 1A Max Single Cell RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| NCP1835MN24R2G | 功能描述:电池管理 1A Max Single Cell Lithium-Ion Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| NCP1835MN24T2 | 功能描述:电池管理 1A Max Single Cell RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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