參數(shù)資料
型號(hào): LTC1559CS8-5
廠商: LINEAR TECHNOLOGY CORP
元件分類: 穩(wěn)壓器
英文描述: Backup Battery Controller with Fixed Output
中文描述: BATTERY CHARGE CONTROLLER, PDSO8
封裝: PLASTIC, SO-8
文件頁(yè)數(shù): 15/20頁(yè)
文件大?。?/td> 344K
代理商: LTC1559CS8-5
15
LTC1559-3.3/LTC1559-5
The LTC1559 works with standard or memory backup
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
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.
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Table 4. Button/Cylindrical NiCd 1.2V Cells
MANUFACTURER
(TYPE)
SAFT
(Memory Backup)
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
SAFT
(Standard)
Sanyo
(Standard)
Panasonic (Standard)
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