参数资料
| 型号： | MAX1925ETC+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI+ 12-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 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： | 12-WQFN 裸露焊盘 |
| 供应商设备封装： | 12-TQFN-EP（4x4） |
| 包装： | 管件 |
Switch-Mode 1-Cell Li+ Chargers
FULL TOPOFF
CHG LED OFF
CVM
4V
3V
2V
1V
PREQUAL1
PREQUAL2
FASTCHG
CCM
4mA
C/10
C/8
C
CHARGE CURRENT
CVM
4V
NORMAL VOLTAGE
PROFILE
4.2V
CHG LED OFF
3V
CCM
C
2V
FAULT
FASTCHG
NORMAL
CURRENT
FAULT
1V
PROFILE
C/8
C/10
2mA
t PREQUAL1 = t/1024
t PREQUAL2 = t/16
CHARGE TIME (t FULLCHG = 3 HOURS WITH C CT = 100nF)
t
Figure 3. Charging Current and Voltage Timing Diagrams
linear 4mA current source (PREQUAL1). When the cell
voltage exceeds 2V, the cell is charged with 10% of the
programmed fast-charge current (I FASTCHG ) until it
reaches 3V. When the cell voltage is above 3V, fast
charging occurs at the full set current. If the cell fails to
reach the next prequalification threshold before a set
time (see t PREQUAL1 and t PREQUAL2 in the Timer
Capacitor and Fault Modes section), charging stops, a
fault alarm is set, and the CHG output blinks.
Figures 2 and 3 show charging behavior typical Li+ cell.
The MAX1925/MAX1926 remain in fast-charge mode
until the battery voltage reaches regulation and the
charge current drops below 1/8th of I FASTCHG . The
charger then enters full topoff mode and the CHG LED
is turned off. In full topoff mode, the controller continues
to operate as in fast-charge mode, except that it
remains in constant-voltage mode (CVM) unless the bat-
tery voltage falls. After every t PREQUAL1 (see the Timer
Capacitor and Fault Modes section) the charger enters
the Kelvin state (for 2 CT clock cycles, 60ms with C CT =
100nF) where charge current is interrupted so that the
battery voltage can be accurately measured.
The MAX1925/MAX1926 do not enter done mode until
t FULLCHG has been reached. If the battery is removed
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1925ETC+ | 功能描述:电池管理 Switch-Mode 1-Cell Li+ 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 |
| MAX1925ETC+T | 功能描述:电池管理 Switch-Mode 1-Cell Li+ 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 |
| MAX1925ETC-T | 功能描述:电池管理 Switch-Mode 1-Cell Li+ 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 |
| MAX1926ETC | 功能描述:电池管理 Switch-Mode 1-Cell Li+ 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 |
| MAX1926ETC+ | 功能描述:电池管理 Switch-Mode 1-Cell Li+ 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 |
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