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參數資料
| 型號： | MAX1898EUB41 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Linear Charger for Single-Cell Li Battery |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封裝： | MICRO MAX PACKAGE-10 |
| 文件頁數： | 9/12頁 |
| 文件大?。?/td> | 210K |
| 代理商： | MAX1898EUB41 |
power is present at IN. If there is no (or insufficient)
voltage at IN, EN/OK will remain low and the charger
will remain off.
Battery Drain Current
The MAX1898 uses advanced CMOS circuitry to com-
pletely monitor battery state, while drawing minimal current
from the cell itself. When the input voltage is less than the
battery, battery drain is typically 3μA. When input power is
present and charging is complete (the charge timer
expires), battery drain is then typically 40μA. This current
may be reduced to 4μA by disabling the restart feature.
Applications Information
The MAX1898 basic application circuit is shown in
Figure 4.
An LED can be added as a charge-state indicator. A
10μF bypass capacitor must be added to the BATT pin.
A Schottky diode should be added between the exter-
nal transistor drain/collector and BATT, to avoid battery
discharge in the event of an input source short circuit.
Figure 5 shows a charger circuit using an external PNP
pass transistor.
Selecting Maximum Charge Time
The maximum charge time can be set with an external
capacitor connected from CT to GND. Select the timing
capacitor using:
where:
t
CHG
= nominal charge time limit in hours.
The maximum charge timer is intended as a safety timer.
It is normally not intended to be part of the charge-con-
trol loop. When charging a Li+ cell at a 1C rate, normal
charge time is approximately 1.5 hours, but this may
have wide variations that depend on temperature and
cell type. In most cases, 3 hours is recommended for the
maximum charge time limit when fast-charging at 1C so
that normal-charging is never interrupted by the charge
timer. Consult the battery manufacturer for details on rec-
ommended timer settings.
The charge safety timer may also be completely dis-
abled by connecting CT to ground.
Note:
If the charge
timer is disabled, both the restart function and prequali-
fication fault indication are also disabled. Only the indi-
cation (blinking LED) is disabled, the prequalification
function itself is not modified.
Controlling Automatic Restart
The MAX1898 features automatic restart that resumes
charging when the cell voltage drops to a predetermined
level. In most timed chargers, once charging times out,
subsequent loading of the battery can discharge the bat-
tery and charging will not resume unless the charger is
restarted by an outside signal. By automatically resuming
charging when the battery voltage drops, the MAX1898
ensures that the cell does not remain partially charged
C
nF
[ ]
=
t
hours
[
CT
CHG
×
]
34 33
.
M
Linear Charger for Single-Cell Li+ Battery
_______________________________________________________________________________________
9
MAX1898
LED
CS
DRV
BATT
GND
8
CT
6
3
2
1
ISET
IN
4
5
7
9
10
EN/OK
RSTRT
CHG
10
μ
F
100nF
Li+ CELL
C
, 100nF CAPACITOR
SETS CHARGE TIME
TO 3hr
OUTPUT VOLTAGE
PROPORTIONAL
TO CHARGE CURRENT
R
SETS
CHARGE
CURRENT
INPUT POWER
OK OUTPUT OR
ENABLE INPUT
CHARGE
INDICATOR
5V TO 12V
Figure 4. Basic Application Circuit
MAX1898
LED
CS
DRV
BATT
GND
8
CT
6
3
2
1
ISET
IN
4
5
7
9
10
EN/OK
RSTRT
CHG
10
μ
F
220nF
Li+ CELL
C
, 100nF CAPACITOR
SETS CHARGE TIME
TO 3hr
OUTPUT VOLTAGE
PROPORTIONAL
TO CHARGE CURRENT
R
SETS
CHARGE
CURRENT
INPUT POWER
OK OUTPUT OR
ENABLE INPUT
CHARGE
INDICATOR
5V TO 12V
Figure 5. Application Circuit with PNP Pass Transistor
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1898EUB41+ | 功能描述:電池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB41+T | 功能描述:電池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB41-T | 功能描述:電池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB42 | 功能描述:電池管理 Linear Charger for 1-Cell Li+ Battery 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 |
| MAX1898EUB42+ | 功能描述:電池管理 Linear Charger for 1-Cell Li+ Battery 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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