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| 型号： | MAX8903YETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 21/30页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CHARGER LI+ 2A 28-TQFN |
| 产品培训模块： | Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | Smart Power Selector™ |
| 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 ~ 16 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
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MAX8903A–E/G/H/J/N/Y
2A 1-Cell Li+ DC-DC Chargers
for USB and Adapter Power
CEN
THERMISTOR
VL
CIRCUITRY
VL
MAX8903_
MAX8903B/MAX8903E/
THERMISTOR
R TB
0.87 VL
MAX8903G ONLY
DETECTOR
ALTERNATE
THERMISTOR
CONNECTION
THM
0.74 VL
COLD
R TS
R T
R TP
R T
0.28 VL
0.03 VL
HOT
ENABLE THM
THM
OUT OF
RANGE
DISABLE
CHARGER
ALL COMPARATORS
GND
Figure 7. Thermistor Monitor Circuitry
Table 3. Fault Temperatures for Different
Thermistors
60mV HYSTERESIS
Thermistor Input (THM)
The THM input connects to an external negative tem-
perature coefficient (NTC) thermistor to monitor battery
Thermistor β (K)
R TB (k ? ) (Figure 7)
Resistance at +25°C
(k ? )
Resistance at +50°C
(k ? )
3000
10
10
4.59
3250
10
10
4.30
3500
10
10
4.03
3750
10
10
3.78
4250
10
10
3.316
or system temperature. Charging is suspended when
the thermistor temperature is out of range. The charge
timers are suspended and hold their state but no fault is
indicated. When the thermistor comes back into range,
charging resumes and the charge timer continues from
where it left off. Connecting THM to GND disables the
thermistor monitoring function. Table 3 lists the fault
Resistance at 0°C (k ? )
25.14
27.15
29.32 31.66
36.91
temperature of different thermistors.
Nominal Hot Trip
55 53 50 49 46
Temperature (°C)
Nominal Cold Trip
-3 -1 0 2 4.5
Temperature (°C)
VL Regulator
VL is a 5V linear regulator that powers the MAX8903’s
internal circuitry and charges the BST capacitor. VL is
used externally to bias the battery’s thermistor. VL takes
its input power from USB or DC. When input power is
available from both USB and DC, VL takes power from
DC. VL is enabled whenever the input voltage at USB
or DC is greater than ~1.5V. VL does not turn off when
the input voltage is above the overvoltage threshold.
Similarly, VL does not turn off when the charger is dis-
Since the thermistor monitoring circuit employs an exter-
nal bias resistor from THM to VL (R TB , Figure 7), the ther-
mistor is not limited only to 10k ? (at +25°C). Any
resistance thermistor can be used as long as the value is
equivalent to the thermistor’s +25°C resistance. For
example, with a 10k ? at +25°C thermistor, use 10k ? at
R TB , and with a 100k ? at +25°C thermistor, use 100k ? .
For a typical 10k ? (at +25°C) thermistor and a 10k ?
R TB resistor, the charger enters a temperature suspend
state when the thermistor resistance falls below 3.97k ?
(too hot) or rises above 28.7k ? (too cold). This corre-
sponds to a 0°C to +50°C range when using a 10k ?
NTC thermistor with a beta of 3500. The general relation
of thermistor resistance to temperature is defined by
the following equation:
? β ?
298 ° C ? ? ?
abled (CEN = high). Connect a 1μF ceramic capacitor
from VL to GND.
R T = R 25 × e
? ? 1
?? ? T + 273 ° C
?
1 ? ?
? ?
Maxim Integrated
21
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相关代理商/技术参数 |
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