参数资料
型号: LTC1559CS8-3.3#PBF
厂商: Linear Technology
文件页数: 15/20页
文件大小: 0K
描述: IC BACKUP BATT CNTRLR 3.3V 8SOIC
标准包装: 100
功能: 备份管理
电池化学: 镍镉
电源电压: 2.9 V ~ 3.5 V
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 8-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOIC
包装: 管件
LTC1559-3.3/LTC1559-5
APPLICATIO N S I N FOR M ATIO N
The LTC1559 works with standard or memory backup
Table 4. Button/Cylindrical NiCd 1.2V Cells
specific NiCd cells. Memory backup cells can operate at
higher temperatures and have lower self-discharge rates.
The LTC1559’s trickle charger is designed to accommo-
date both memory backup cells (with low self-discharge)
and standard cells (with higher self-discharge). Some
recommended manufacturers and part numbers are listed
in Table 4.
The internal resistance of the backup cell increases power
dissipation as the boost converter draws current from it
during switching, degrading efficiency. Due to the fixed
inductor peak current architecture, the LTC1559’s boost
converter output power drops significantly when the NiCd
cell’s internal resistance increases at the end of its charge.
The inductor charging time increases due to a larger R/L
MANUFACTURER
(TYPE)
SAFT
(Memory Backup)
SAFT
(Standard)
Sanyo
(Standard)
Panasonic (Standard)
PART
NUMBER
GB60
GB170
GB280
VB10E
VB22E
VB30E
VB60E
N-50AAA
N-110AA
N-120TA
N-150N
N-200AAA
N-270AA
N-500A
P-11AA
CAPACITY
(mAhr)
60
170
280
100
220
300
600
55
120
130
170
220
305
500
110
R SERIES
( ? )
1.1
0.4
0.4
0.038
0.022
0.017
0.014
0.055
0.03
0.034
0.027
0.021
0.015
0.09
0.08
time constant, decreasing the switching frequency. It is
advisable, especially for batteries with high internal resis-
tance, to include a 1 μ F or larger bypass capacitor across
the battery to ensure that the boost converter can deliver
the maximum output power regardless of the NiCd inter-
nal resistance.
15
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