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參數(shù)資料
| 型號(hào)： | MAX1679EUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Single-Cell Li Battery Charger for Current-Limited Supply |
| 中文描述： | BATTERY CHARGE CONTROLLER, PDSO8 |
| 封裝： | UMAX-8 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 138K |
| 代理商： | MAX1679EUA |
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:
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%.
R
10k
V
V
BR
'
￠
1
ADJ
BR
=
M
Single-Cell Li+ Battery Charger
for Current-Limited Supply
_______________________________________________________________________________________
9
CHG
High impedance
No battery or no charger, or
cell voltage < 2.2V
CONDITION
Low (LED on)
Fast-charge or pulsed top-
off charge in progress
LED blinking 0.5sec on (low),
3.5sec off (high impedance)
Charge cycle complete
2Hz, 50% duty factor (LED
flashing)
Fast-charge timer expiration
or initial prequalification state
(V
BATT
< 2.5V or initial tem-
perature fault)
Table 2.
CHG
Output States
THERM
ADJ
0.001
μ
F
IN
CHG
GATE
PMOS FET
FAIRCHILD FDC638P
-4.5A, -20V
0.07
AT V
GS
= -2.5V
CURRENT-LIMITED
WALL CUBE
(800mA, 6V max)
BATT
TSEL*
10k
SINGLE
Li+
CELL
2.2
μ
F
*SEE TABLE 3 FOR TSEL POSITION AND ASSOCIATED TIMER SETTINGS.
MAX1679
NTC THERMISTOR
FENWAL
140-103LAG-RBI
(10k
AT 25
°
C)
THERM
IN
CHG
GATE
PMOSFET
FAIRCHILD FDC638P
-4.5A, -20V
0.07
AT V
GS
= -2.5V
SCHOTTKY DIODE
30V, 1A
ZETEX ZHCS1000
CURRENT LIMITED
WALL CUBE
(800mA, 6V max)
BATT
TSEL*
R
410k
1%**
SINGLE
Li+
CELL
2.2
μ
F
0.001
μ
F
5mA
LED
*SEE TABLE 3 FOR TSEL POSITION AND ASSOCIATED TIMER SETTINGS.
** R
SETS BATTERY REGULATION VOLTAGE TO 4.10V; LEAVE OPEN
FOR 4.2V.
MAX1679
ADJ
Figure 3. Simple Application Circuit
Figure 4. Application Circuit Including LED, Thermistor, and
Reverse-Current Protection Diode
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1679EUA+ | 功能描述:電池管理 Battery Charger Current-Limited Sply RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1679EUA+T | 功能描述:電池管理 Battery Charger Current-Limited Sply RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX1679EUA-T | 功能描述:電池管理 Battery Charger Current-Limited Sply RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
| MAX167ACNG | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| MAX167ACNG+ | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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