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| 型号： | MAX1898EUB41+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI+ SNGL 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 4.5 V ~ 12 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 带卷 (TR) |
Linear Charger for Single-Cell Li+ Battery
Selecting External Components
The MAX1898 drives an external transistor to control
charging current. The most important specifications for the
pass transistor (MOSFET or bipolar) are current rating and
package power dissipation. Since the MAX1898 operates
as a linear charger, heat will dissipate in the external tran-
sistor. The worst-case power dissipation will be:
P DISS(MAX) = I FASTCHG (V IN - 2.5V)
The pass transistor and heatsinking (typically an expand-
ed PC board plane) must be rated for P DISS(MAX) .
The pass device will most commonly be a P-channel
MOSFET. Its operating voltage must exceed the
expected input voltage, but MOSFET on-resistance is
important only in low-dropout designs where V IN is only
slightly higher than the battery regulation voltage. In
most charger designs, a fairly low-cost FET (around
100m ? to 200m ? R DS(ON) ) performs more than ade-
quately. Lower resistance FETs perform well also, but
are not worth the added cost in this case.
A PNP bipolar transistor may also be used as a pass
device. DRV can sink up to 4mA, so reasonable high
current gain (h FE or Beta) is required to allow DRV to
drive the base of a bipolar pass transistor. For a 500mA
fast-charge current, an h FE of 125 is required. Although
their current gain is high, Darlington PNP transistors are
not recommended due to stability limitations.
If V IN is less than V BATT , the body diode inherent in the
external enhancement-mode FET allows current to flow
from the cell back to the source. To prevent this, add a
Schottky diode between the drain and BATT, as shown
in Figure 4.
Chip Information
TRANSISTOR COUNT: 1816
PROCESS: BiCMOS
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1898EUB42 | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB42+ | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB42+T | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB42-T | 功能描述:电池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EVKIT | 功能描述:电池管理 Evaluation Kit for the MAX1898 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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