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| 型号： | LTC1558CGN-3.3#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC BACKUP BATT CNTRLR3.3V 16SSOP |
| 标准包装： | 100 |
| 功能： | 备份管理 |
| 电池化学： | 镍镉 |
| 电源电压： | 2.9 V ~ 3.46 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
LTC1558-3.3/LTC1558-5
APPLICATIO N S I N FOR M ATIO N
Table 2. Recommended Inductors
Table 3. Button/Cylindrical NiCd 1.2V Cells
PART
TYP INDUCTOR
PART
CAPACITY
MANUFACTURER
Sumida
Sumida
NUMBER
CD54-220
CDRH73/74
VALUE
22 μ H ± 20%
22 μ H ± 20%
DCR ( ? )
0.18
0.2/0.11
MANUFACTURER
SAFT
(Memory Backup)
NUMBER
GB60
GB170
GB280
(mAhr)
60
170
280
R SERIES ( ? )
1.1
0.4
0.4
SAFT
VB10E
100
0.038
Capacitor Selection
The LTC1558 requires a minimum V BAK capacitor of 44 μ F
to ensure that the boost converter can regulate the output
at 20mA load. The capacitor’s ESR should be small (< 0.2 ? )
to minimize voltage spikes that might incorrectly trigger
the LTC1558’s internal FB comparators. Note that the
LTC1558 can usually share the output capacitor with the
system regulator. Thus its ratings like V MAX , I RIPPLE(RMS) ,
etc., will all have to meet the system regulator’s specifica-
(Standard)
Sanyo
(Standard)
Panasonic
VB22E
VB30E
VB60E
N-50AAA
N-110AA
N-120TA
N-150N
N-200AAA
N-270AA
N-500A
P-11AA
220
300
600
55
120
130
170
220
305
500
110
0.022
0.017
0.014
0.055
0.03
0.034
0.027
0.021
0.015
0.09
0.08
tions as well.
Battery Selection
A primary application for the LTC1558 is a “bridging”
supply, only providing backup current while the main
system battery is being replaced. In these applications,
the LTC1558 works well with NiCd button cells or small
cylindrical cells, reducing system costs and board space.
It is optimized for use with up to 512mAhr battery
capacities.
The LTC1558 can work with standard or memory backup
specific NiCd cells. Memory backup cells can operate at
higher temperatures and have lower self discharge rates.
The LTC1558’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 3.
14
(Standard)
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 LTC1558’s boost
converter output power drops significantly when the NiCd
cell’s internal resistance increases at the end of its charge.
This is because the inductor charging time will increase
due to a larger R/L time constant, decreasing the switching
frequency. It is advisable, especially for batteries with high
internal resistance, to include a 47 μ F bypass capacitor
across the battery to ensure that the boost converter can
deliver the maximum output power regardless of the NiCd
internal resistance.
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| LTC1558CGN-5 | 功能描述:IC BACKUP BATT CNTRLR 5V 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:2,000 系列:Impedance Track™ 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.4 V ~ 2.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:带卷 (TR) 产品目录页面:1020 (CN2011-ZH PDF) 配用:BQ27350EVM-ND - BQ27350EVM 其它名称:296-21665-2 |
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| LTC1558CGN-5#TRPBF | 功能描述:IC BACKUP BATT CNTRLR 5V 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:1 系列:- 功能:充电管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:3.75 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:剪切带 (CT) 产品目录页面:669 (CN2011-ZH PDF) 其它名称:MCP73831T-2ACI/OTCT |
| LTC1558CS-3.3 | 功能描述:IC BACKUP BATT CNTRLR3.3V 16SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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