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LTC1558CS-3.3 数据表(PDF) 14 Page - Linear Technology

部件名 LTC1558CS-3.3
功能描述  Backup Battery Controller with Programmable Output
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1558CS-3.3 数据表(HTML) 14 Page - Linear Technology

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LTC1558-3.3/LTC1558-5
Table 2. Recommended Inductors
PART
TYP INDUCTOR
MANUFACTURER
NUMBER
VALUE
DCR (
Ω)
Sumida
CD54-220
22
µH ±20%
0.18
Sumida
CDRH73/74
22
µH ±20%
0.2/0.11
Capacitor Selection
The LTC1558 requires a minimum VBAK capacitor of 44µF
to ensure that the boost converter can regulate the output
at 20mA load. The capacitor’s ESR should be small (< 0.2
Ω)
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 VMAX, IRIPPLE(RMS),
etc., will all have to meet the system regulator’s specifica-
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.
APPLICATIONS INFORMATION
Table 3. Button/Cylindrical NiCd 1.2V Cells
PART
CAPACITY
MANUFACTURER
NUMBER
(mAhr)
RSERIES (Ω)
SAFT
GB60
60
1.1
(Memory Backup)
GB170
170
0.4
GB280
280
0.4
SAFT
VB10E
100
0.038
(Standard)
VB22E
220
0.022
VB30E
300
0.017
VB60E
600
0.014
Sanyo
N-50AAA
55
0.055
(Standard)
N-110AA
120
0.03
N-120TA
130
0.034
N-150N
170
0.027
N-200AAA
220
0.021
N-270AA
305
0.015
N-500A
500
0.09
Panasonic
P-11AA
110
0.08
(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
µF 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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