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| 型号： | MAX8671XETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 31/44页 |
| 文件大小： | 0K |
| 描述： | IC PMIC W/CHARGER 40-TQFN-EP |
| 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： | 4.1 V ~ 6.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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PMIC with Integrated Charger and
Smart Power Selector for Handheld Devices
Table 3. Charge Status Outputs
Table 4. Charge Times vs. C CT
CST1
0
0
1
CST2
0
1
0
CHARGING
Yes
No
No
STATE
Prequalification or
fast charge
Thermistor suspend
Timer fault
C CT (nF)
68
100
150
t PQ (min)
15.0
22.0
33.0
t FC (min)
100% to 50%
299
440
660
t FC (min)
50% to 20%
598
880
1320
No input power or
220
48.4
968
1936
1
1
No
top-off or
470
103.4
2068
4136
done
Note: CST1 and CST2 are active-low, open-drain outputs. “0”
indicates that the output device is pulling low. “1” indicates
that the output is high impedance.
CHARGE, PREQUALIFICATION,
AND TOP-OFF CURRENT
Charge Timer (CT)
As shown in Figure 7, a fault timer prevents the battery
from charging indefinitely. In prequalification and fast-
charge modes, the timer is controlled by the capaci-
tance at CT (C CT ). The MAX8671X supports values of
C CT from 0.01μF to 1μF. Calculate the prequalification
and fast-charge times as follows (Table 4, Figure 8):
1000
100
vs. CHARGE SETTING RESISTOR
I CHGMAX
I PQ
t PQ = 33 min ×
C CT
0 . 15 μ F
10
I TO
t FC = 660 min ×
C CT
0 . 15 μ F
1
When the charger exits fast-charge mode, a fixed 15s
0
5
R CISET (k Ω )
10
15
top-off mode is entered:
t TO = 15 s
While in the constant-current fast-charge mode (Figure
6), if the MAX8671X reduces the battery charge current
due to its internal die temperature or large system
loads, it slows down the charge timer. This feature elim-
inates nuisance charge timer faults. When the battery
charge current is between 100% and 50% of its pro-
grammed fast-charge level, the fast-charge timer runs
at full speed. When the battery charge current is
between 50% and 20% of the programmed fast-charge
level, the fast-charge timer is slowed by 2x. Similarly,
when the battery charge current is below 20% of the
programmed fast-charge level, the fast-charge timer is
paused. The fast-charge timer is not slowed or paused
Figure 8. Programming Charge Current
Connect CT to AGND to disable the prequalification
and fast-charge timers. With the internal timers of the
MAX8671X disabled, an external device, such as a μP,
can control the charge time through the CEN input.
Setting the Charger Currents (CISET)
As shown in Table 5 and Figure 9, a resistor from
CISET to ground (R CISET ) sets the maximum fast-
charge current (I CHGMAX ), the charge current in pre-
qualification mode (I PQ ), and the top-off threshold (I TO ).
The MAX8671X supports values of I CHGMAX from
200mA to 1000mA. Select the R CISET as follows:
when the charger is in the constant voltage portion of
its fast-charge mode (Figure 6) where charge current
reduces normally.
R CISET = 2000 ×
1 . 5 V
I CHGMAX
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