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| 型号： | MAX1679EUA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC BATT CHRGR 1CELL LITH 8-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 功能： | 充电管理 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 5 V ~ 22 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-uMAX |
| 包装： | 管件 |
Single-Cell Li+ Battery Charger
for Current-Limited Supply
Applications Information
The MAX1679 was designed to offer the maximum inte-
gration and functionality in the smallest, most basic
application circuit possible. The only necessary exter-
nal components are a current-limited wall cube, a
PMOS FET, two small capacitors, and a 10k ? thermis-
tor/resistor. This simple application circuit appears in
Figure 3. Optionally (as shown in Figure 4), an LED can
be added as a charge-state indicator, a resistor (R ADJ )
can be used to trim down the maximum charge voltage
from 4.2V, and/or a reverse-current-protection diode
can be added in line at the source.
If the input is shorted, the MAX1679 will not allow current
to flow from BATT back through IN to the source.
However, the body diode inherent in the enhancement-
mode FET would still allow the cell to discharge rapidly.
To prevent this, add a power Schottky diode between
the source and IN as in Figure 4.
Adjusting the Battery Regulation Voltage
A typical Li+ cell should be charged at a constant cur-
rent until it reaches a voltage of about 4.2V, then
charged at this voltage until the current decays below a
predetermined level. The MAX1679 provides a simple
way to reduce this maximum target voltage with a sin-
gle resistor between ADJ and GND. Internally, ADJ
connects to a precision 1.4V reference through a 10k ?
resistor. Leave ADJ open for a battery regulation volt-
age (V BR ) of 4.2V; connect a 1% resistor from ADJ to
GND to form a voltage divider for lower battery regula-
tion voltage (V BR ￠ ) . Select the external value using:
V BR
Table 2. CHG Output States
CONDITION
CHG
R ADJ =
10k ?
? 1
V BR ' ￠
No battery or no charger, or
cell voltage < 2.2V
Fast-charge or pulsed top-
off charge in progress
Fast-charge timer expiration
or initial prequalification state
(V BATT < 2.5V or initial tem-
perature fault)
Charge cycle complete
High impedance
Low (LED on)
2Hz, 50% duty factor (LED
flashing)
LED blinking 0.5sec on (low),
3.5sec off (high impedance)
A 1% tolerance resistor at ADJ degrades system accu-
racy by only a fraction of a percent. For example, an
R ADJ of 410k ? ±1% reduces the battery regulation volt-
age by 2.4% (V BR ￠ = 4.1V from equation above, and
(V BR ￠ - V BR ) / V BR = (4.1 - 4.2) / 4.2 = -2.4%). Therefore,
the additional system error is simply the R ADJ tolerance
multiplied by the percent change in the battery regula-
tion voltage, or (1%)(2.4%) = 0.024%.
CURRENT-LIMITED
WALL CUBE
(800mA, 6V max)
PMOS FET
FAIRCHILD FDC638P
-4.5A, -20V
0.07 ? AT V GS = -2.5V
CURRENT LIMITED
WALL CUBE
(800mA, 6V max)
SCHOTTKY DIODE
30V, 1A
ZETEX ZHCS1000
PMOSFET
FAIRCHILD FDC638P
-4.5A, -20V
0.07 ? AT V GS = -2.5V
GATE
GATE
IN
MAX1679
BATT
5mA
LED
IN
MAX1679
BATT
SINGLE
CHG
0.001 μ F
ADJ
THERM
10k
TSEL*
2.2 μ F
SINGLE
Li+
CELL
0.001 μ F
R ADJ
410k
1%**
CHG
TSEL*
ADJ THERM 2.2 μ F
NTC THERMISTOR
FENWAL
140-103LAG-RBI
(10k ? AT 25 ° C)
Li+
CELL
*SEE TABLE 3 FOR TSEL POSITION AND ASSOCIATED TIMER SETTINGS.
*SEE TABLE 3 FOR TSEL POSITION AND ASSOCIATED TIMER SETTINGS.
Figure 3. Simple Application Circuit
** R ADJ SETS BATTERY REGULATION VOLTAGE TO 4.10V; LEAVE OPEN
FOR 4.2V.
Figure 4. Application Circuit Including LED, Thermistor, and
Reverse-Current Protection Diode
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1679EUA+ | 功能描述:电池管理 Battery Charger Current-Limited Sply RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1679EUA+T | 功能描述:电池管理 Battery Charger Current-Limited Sply RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX1679EUA-T | 功能描述:电池管理 Battery Charger Current-Limited Sply RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX167ACNG | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX167ACNG+ | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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