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参数资料
| 型号： | MAX8601ETD/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC CHARGER LI+ DUAL 14TDFN |
| 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： | 0 V ~ 14 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
Single-/Dual-Input 1-Cell Li+ Chargers with
OVP Protection and Programmable Charge Timer
Table 1. Fault Temperatures for Different Thermistors
THERMISTOR BETA
Resistance at +25 ° C
Resistance at +50 ° C
Resistance at 0 ° C
Nominal Hot Trip Temperature
Nominal Cold Trip Temperature
3000
10,000 Ω
4587.78 Ω
25,140.55 Ω
+55.14 ° C
-3.24 ° C
3250
10,000 Ω
4299.35 Ω
27,148.09 Ω
+52.60 ° C
-1.26 ° C
3500
10,000 Ω
4029.06 Ω
29,315.94 Ω
+50.46 ° C
+0.46 ° C
3750
10,000 Ω
3775.75 Ω
31,656.90 Ω
+48.63 ° C
+1.97 ° C
? ? ? 1 ? ? 1 ? ? ?
? β ? ? ? ? ? ? ? ?
? ? 298 ? ? ? ?
R T = R 25 ° C × e ? ? ? T + 273
Charge Current Selection
The maximum charging current from a supply connect-
ed to DC is programmed by an external resistor (R SETI )
connected from SETI to GND. Calculate the R SETI value
as follows:
R SETI = 1500 / I CHARGE(MAX)
where I CHARGE(MAX) is in amps and R SETI is in ohms.
SETI can also be used to monitor the actual charge-
current level. The output voltage at SETI is proportional
to the charging current as follows:
V SETI = (I CHARGE x R SETI ) / 1000
Note that the prequal current for both USB and DC
input operation is 1/10 of the fast-charge current set by
R SETI . Also, the top-off charge-current threshold for
both USB and DC input operation is set to 7.5% of the
fast-charge current set by R SETI .
I PREQUAL = 150 / R SETI
I TOP-OFF = 112.5 / R SETI
Timer Capacitor Selection
The MAX8600/MAX8601 contain timers for prequal,
fast-charge, and top-off operation. These time periods
are determined by the capacitance from CT to GND. To
set the charge times, calculate C CT as follows:
T FASTCHARGE = 334min x (C CT / 0.068μF)
T PREQUAL = T TOPOFF = 34.8min x (C CT / 0.068μF)
Note that when charging at 100mA from the USB input
(MAX8601), the fast-charge timer is inhibited. When THM
halts charging, the timers stop and hold their value.
Battery Temperature Control
The MAX8600/MAX8601 monitor battery temperature
through a negative TC thermistor which is in close ther-
mal contact with the battery. Select a thermistor resis-
tance that is 10k Ω at +25°C and has a beta of 3500.
The IC compares the resistance from THM to GND and
suspends charging when it is greater than 28.3k Ω or
less than 3.94k Ω , which translates to a temperature of
0°C to +50°C. Table 1 shows the nominal temperature
limits that result from a wide range of available thermis-
tor temperature curves. The curves are defined by the
following equation:
?
where β is the BETA term in Table 1.
Connect THM to GND to disable the temperature-con-
trol function. When R THM disables charging, all timers
pause and hold their value.
Capacitor Selection
Connect a 2.2μF ceramic capacitor from BAT to GND
for proper stability. Connect a 1μF ceramic capacitor
from DC to GND. If using the USB input for the
MAX8601, bypass USB to GND with a 1μF ceramic
capacitor. Use a larger input bypass capacitor for high
charging currents to reduce supply noise. All capaci-
tors should be X5R dielectric or better. Be aware that
some capacitors have large voltage coefficients and
should be avoided.
Thermal Considerations
The MAX8600/MAX8601 are in a thermally enhanced
TDFN package with an exposed paddle. Connect the
exposed paddle of the package to a large copper
ground plane to provide a thermal contact between the
device and the circuit board. The exposed paddle
transfers heat away from the device, allowing the IC to
charge the battery with maximum current, while mini-
mizing the increase in die temperature. Note that the
MAX8600/MAX8601s’ thermal-limit control allows the
charger to be tolerant of thermally restricted PC board
layouts that are sometimes unavoidable in compact
portable designs. With such non-optimal layouts, the
charger still operates, but may reduce charge current
to manage temperature rise.
8
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