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| 型号： | MAX8663ETL+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/34页 |
| 文件大小： | 0K |
| 描述： | IC PMIC LI+ SNGL CELL 40TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 手持/移动设备 |
| 电流 - 电源： | 900µA |
| 电源电压： | 4.1 V ~ 8 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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Power-Management ICs for
Single-Cell, Li+ Battery-Operated Devices
Connect CT to GND to disable the prequalification and
fast-charge timers, allowing the battery to charge indef-
a beta of 3500. The relation of thermistor resistance to
temperature is defined by the following equation:
? ? 1 1 ? ?
?? ? T + 273 298 ? ??
initely in top-off mode, or if other system timers are to
be used to control charging.
Charge-Enable Input ( CEN )
R T
= R 25 × e
? β ? ? ? ?
Driving CEN high disables the battery charger. Driving
CEN low enables the charger when a valid source is
connected at DC. CEN does not affect the input limit
current, except that driving CEN high and PEN2 low
activates USB suspend mode.
In many systems, there is no need for the system con-
troller (typically a microprocessor) to disable the charg-
er because the SPS circuitry independently manages
charging and adapter/battery power hand-off. In these
situations, CEN can be connected to ground.
Charge Status Output ( CHG )
CHG is an open-drain output that indicates charger sta-
tus. CHG is low when the battery charger is in prequali-
fication or fast-charge mode. It is high impedance
when the charger is done, in top-off, or disabled.
The charger faults if the charging timer expires in pre-
qualification or fast charge. In this state, CHG pulses at
1Hz to indicate that a fault occurred.
Battery Charger Thermistor Input (THM)
Battery or ambient temperature can be monitored with
a negative temperature coefficient (NTC) thermistor.
Charging is allowed when the thermistor temperature is
within the allowable range.
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 corresponds to a 0
to +50°C range when using a 10k ? NTC thermistor with
where:
R T = The resistance in ohms of the thermistor at tem-
perature T in Celsius
R25 = The resistance in ohms of the thermistor at +25°C
? = The material constant of the thermistor, which typi-
cally ranges from 3000K to 5000K
T = The temperature of the thermistor in °C
Table 2 shows temperature limits for different thermistor
material constants.
Some designs may prefer other trip temperatures. This
can usually be accommodated by connecting a resistor
in series and/or in parallel with the thermistor and/or
using a thermistor with different ?. For example, a
+45°C hot threshold and 0°C cold threshold can be
realized by using a thermistor with a ? of 4250 and con-
necting 120k ? in parallel. Since the thermistor resis-
tance near 0°C is much higher than it is near +50°C, a
large parallel resistance lowers the cold threshold,
while only slightly lowering the hot threshold.
Conversely, a small series resistance raises the cold
threshold, while only slightly raising the hot threshold.
The charger timer pauses when the thermistor resis-
tance goes out of range: charging stops and the timer
counters hold their state. When the temperature comes
back into range, charging resumes and the counters
continue from where they left off. Connecting THM to
GND disables the thermistor function.
Table 2. Fault Temperatures for Different Thermistors
THERMISTOR ? (K)
Resistance at +25°C (k ? )
Resistance at +50°C (k ? )
Resistance at 0°C (k ? )
Nominal Hot Trip Temperature (°C)
Nominal Cold Trip Temperature (°C)
3000 (K)
10
4.59
25.14
55
-3
3250 (K)
10
4.30
27.15
53
-1
3500 (K)
10
4.03
29.32
50
0
3750 (K)
10
3.78
31.66
49
2
4250 (K)
10
3316
36.91
46
4.5
26
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8663EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX8663 EVAL KIT - Boxed Product (Development Kits) |
| MAX8664AEEP+ | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8664AEEP+T | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8664BEEP+ | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8664BEEP+T | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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