參數(shù)資料
型號(hào)： MAX1925
廠商： Maxim Integrated Products, Inc.
元件分類： 數(shù)字信號(hào)處理
英文描述： Fixed-Point Digital Signal Processor 548-FCBGA
中文描述： 開關(guān)模式單節(jié)Li+電池充電器
文件頁(yè)數(shù)： 11/16頁(yè)
文件大?。?/td> 443K
代理商： MAX1925
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
M
Switch-Mode 1-Cell Li+ Chargers
______________________________________________________________________________________
11
CVM
1V
2V
3V
4V
4mA
C/10
C
C/8
PREQUAL1
CHARGE CURRENT
C
1V
2V
3V
4V
C
2mA
C/10
C
C
t
t
PREQUAL2
= t/16
4.2V
C/8
FAULT
NORMAL VOLTAGE
PROFILE
NORMAL
CURRENT
PROFILE
FASTCHG
FULL TOPOFF
CCM
CVM
CCM
FASTCHG
PREQUAL2
FAULT
t
PREQUAL1
= t/1024
CHARGE TIME (t
FULLCHG
= 3 HOURS WITH C
CT
= 100nF)
CHG LED OFF
CHG LED OFF
Figure 3. Charging Current and Voltage Timing Diagrams
相關(guān)PDF資料
PDF描述
MAX1926 Switch-Mode 1-Cell Li+ Chargers
MAX1926ETC Switch-Mode 1-Cell Li+ Chargers
MAX1925ETC Switch-Mode 1-Cell Li+ Chargers
MAX192AMJP Low-Power, 8-Channel, Serial 10-Bit ADC
MAX192AEAP Low-Power, 8-Channel, Serial 10-Bit ADC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1925ETC 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1925ETC+ 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1925ETC+T 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1925ETC-T 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
MAX1926ETC 功能描述:電池管理 Switch-Mode 1-Cell Li+ Charger RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel
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