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参数资料
| 型号： | MAX8568AETE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC BATT MANAGE LITH 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 功能： | 备份管理 |
| 电池化学： | 锂离子（Li-Ion）；镍金属氢化物（NiMH） |
| 电源电压： | 2.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（3x3） |
| 包装： | 管件 |
Complete Backup-Management ICs
for Lithium and NiMH Batteries
The lithium charger acts like a current-limited voltage
source. The battery regulation voltage for lithium mode,
V BK(LIMAX) , is:
V BK(LIMAX) = 3.5 x V TERMV
If V TERMV = 1.2V, then the final charge voltage is 4.2V.
Connect TERMV to a resistor-divider from REF to GND.
Adjust V TERMV with resistors R11 and R12 (Figure 2).
Select R12 to be in the 100k ? to 1M ? range. Calculate
R11 as follows:
ues to rise when trickle charged, all charging ceases at
V BK(NIMAX) . V BK(NILO) , V BK(NIHI) , and V BK(NIMAX) are
set as follows:
BK voltage where fast charge begins:
V BK(NILO) = V STRTV
BK voltage where trickle charge begins:
V BK(NIHI) = 1.163 x V TERMV
BK voltage where all charging stops:
? 3 . 5 × V REF
R 11 = R 12 ?
1 ?
where V REF =1.25V.
? V BK ( LIMAX )
?
?
?
V BK(NIMAX) = 1.493 x V TERMV
Resistor-dividers (see Figure 3) set V STRTV and V TERMV
by dividing down REF. To minimize operating current,
resistors between 100k ? and 1M ? should be used for
R14 and R16 in Figure 3. The formulas for the upper
Using an NiMH Backup Battery
The MAX8568 can charge NiMH backup batteries from
divider-resistors in terms of V BK(NILO) , V BK(NIHI) , and
V BK(NIMAX) are:
R 13 = R 14 ?
1 ?
the main battery connected at IN. Connect NI/LI to
BKSU for NiMH backup battery charging. V TERMV sets
the maximum cell voltage and also the trip point for the
fast-charge-to-trickle-charge transition. V STRTV sets the
?
?
V REF
V BK ( NILO )
?
?
?
? 1 . 163 × V REF
R 15 = R 16 ?
1 ?
trickle-to-fast-charge transition threshold.
In NiMH charge mode (NI/LI connected to BKSU), the
charger ramps the battery between two thresholds
? V BK ( NIHI )
?
?
?
measured at the battery connection BK, V BK(NILO) and
V BK(NIHI) . When the battery falls to V BK(NILO) , trickle
charging stops and fast charging starts. When the bat-
tery rises to V BK(NIHI) , fast charging stops and trickle
charging begins. If, for any reason, the battery contin-
Once V BK(NIHI) is selected, the maximum battery volt-
age is:
V BK(NIMAX) = 1.283 x V BK(NIHI)
REF
16
REF
16
R13
R15
R11
TERMV
15
TERMV
15
R16
R12
STRTV
14
STRTV
14
R14
Figure 2. Resistor-Divider for Setting the Maximum Battery
Voltage, V BK(LIMAX) , for Rechargeable Lithium-Type Backup
Batteries
Figure 3. 2-Resistor-Dividers for Setting V BK(NILO) and V BK(NIHI)
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8568AETE+ | 功能描述:电池管理 Backup-Mgt IC for Li & NiMH Bat 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 |
| MAX8568AETE+T | 功能描述:电池管理 Backup-Mgt IC for Li & NiMH Bat 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 |
| MAX8568AETE-T | 功能描述:电池管理 Backup-Mgt IC for Li & NiMH Bat 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 |
| MAX8568BETE | 功能描述:电池管理 Backup-Mgt IC for Li & NiMH Bat 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 |
| MAX8568BETE-T | 功能描述:电池管理 Backup-Mgt IC for Li & NiMH Bat 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 |
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