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參數(shù)資料
| 型號(hào)： | MAX712-MAX713 |
| 廠(chǎng)商： | Maxim Integrated Products, Inc. |
| 英文描述： | NiCd/NiMH Battery Fast-Charge Controllers |
| 中文描述： | 鎳鎘/鎳氫電池快速充電控制器 |
| 文件頁(yè)數(shù)： | 8/18頁(yè) |
| 文件大?。?/td> | 168K |
| 代理商： | MAX712-MAX713 |
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M
NiCd/NiMH Battery
Fast-Charge Controllers
8
_______________________________________________________________________________________
_______________Detailed Desc ription
The MAX712/MAX713 fast charge NiMH or NiCd batter-
ies by forcing a constant current into the battery. The
MAX712/MAX713 are always in one of two states: fast
charge or trickle charge. During fast charge, the
current level is high; once full charge is detected, the
current reduces to trickle charge. The device monitors
three variables to determine when the battery reaches
full charge: voltage slope, battery temperature, and
charge time.
Figure 1 shows the block diagram for the MAX712/
MAX713. The timer, voltage-slope detection, and temper-
ature comparators are used to determine full charge
state. The voltage and current regulator controls output
voltage and current, and senses battery presence.
Figure 2 shows a typical charging scenario with batteries
already inserted before power is applied. At time 1, the
MAX712/MAX713 draw negligible power from the bat-
tery. When power is applied to DC IN (time 2), the
power-on reset circuit (see the
POWER
_ON
_RESET
sig-
nal in Figure 1) holds the MAX712/MAX713 in trickle
charge. Once
POWER
_ON
_RESET
goes high, the device
enters the fast-charge state (time 3) as long as the cell
voltage is above the undervoltage lockout (UVLO) volt-
age (0.4V per cell). Fast charging cannot start until (bat-
tery voltage) / (number of cells) exceeds 0.4V.
When the cell voltage slope becomes negative, fast
charge is terminated and the MAX712/MAX713 revert
to trickle-charge state (time 4). When power is removed
(time 5), the device draws negligible current from the
battery.
Figure 3 shows a typical charging event using tempera-
ture full-charge detection. In the case shown, the bat-
tery pack is too cold for fast charging (for instance,
brought in from a cold outside environment). During
time 2, the MAX712/MAX713 remain in trickle-charge
state. Once a safe temperature is reached (time 3), fast
charge starts. When the battery temperature exceeds
the limit set by THI, the MAX712/MAX713 revert to trick-
le charge (time 4).
0
A
mA
μ
A
1
0.4
TIME
VOLTAGE
C
C
C
1.4
1.5
1.3
2
4
5
3
1. NO POWER TO CHARGER
2. CELL VOLTAGE LESS THAN 0.4V
3. FAST CHARGE
4. TRICKLE CHARGE
5. CHARGER POWER REMOVED
TEMPERATURE
Figure 2. Typical Charging Using Voltage Slope
A
mA
μ
A
1
TIME
C
C
TLO
THI
2
4
3
1. NO POWER TO CHARGER
2. CELL TEMPERATURE TOO LOW
3. FAST CHARGE
4. TRICKLE CHARGE
Figure 3. Typical Charging Using Temperature
A
1.5
1.4
1.3
mA
μ
A
1
TIME
VREF = VLIMIT
C
C
2
4
3
1. BATTERY NOT INSERTED
2. FAST CHARGE
3. TRICKLE CHARGE
4. BATTERY REMOVED
Figure 4. Typical Charging with Battery Insertion
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX712EPE | Octal Buffers And Line Drivers With 3-State Outputs 20-CFP -55 to 125 |
| MAX712ESE | Octal Buffers And Line Drivers With 3-State Outputs 20-CDIP -55 to 125 |
| MAX712MJE | Octal Buffers And Line Drivers With 3-State Outputs 20-LCCC -55 to 125 |
| MAX713CPE | NiCd/NiMH Battery Fast-Charge Controllers |
| MAX713CSE | NiCd/NiMH Battery Fast-Charge Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX712MJE | 功能描述:電池管理 NiCd/NiMH Battery Fast-Charge Ctlr RoHS:否 制造商:Texas Instruments 電池類(lèi)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 |
| MAX713 | 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:Switch-Mode Battery Charger Delivers 5A |
| MAX713C/D | 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:NiCd/NiMH Battery Fast-Charge Controllers |
| MAX713CPE | 功能描述:電池管理 NiCd/NiMH Battery Fast-Charge Ctlr RoHS:否 制造商:Texas Instruments 電池類(lèi)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 |
| MAX713CPE+ | 功能描述:電池管理 NiCd/NiMH Battery Fast-Charge Ctlr RoHS:否 制造商:Texas Instruments 電池類(lèi)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 |
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