LTC1558-5 Linear Technology, LTC1558-5 Datasheet - Page 4

• Manufacturer Part Number: LTC1558-5
• Description: Backup Battery Controller with Programmable Output
• Manufacturer: Linear Technology

LTC1558-3.3/LTC1558-5
4
TYPICAL PERFORMANCE CHARACTERISTICS
150
125
100
100
75
50
25
80
60
40
20
60
50
40
30
20
10
0
0
0
1.0
64
2
Output Power vs Battery Voltage
Boost Converter Switching
Duty Cycle
Fast Recharge Time (Assume
Fully Exhausted NiCd Battery)
V
V
I
V
V
PK
BATT
CC
CC
BAK
= 330mA
= 3.3V (LTC1558-3.3)
= 5V (LTC1558-5)
= 6V
= 1.2V
NiCd TERMINAL VOLTAGE (V)
BATTERY CAPACITY (mAHr)
OUTPUT VOLTAGE, V
1.1
4
128
1.2
6
256
BAK
1.3
8
(V)
W
1558 G01
1558 G04
1558 G07
U
512
1.4
10
10.5
10.0
3.0
2.5
2.0
1.5
1.0
0.5
9.5
9.0
8.5
8.0
7.5
0
6
5
4
3
2
1
0
0.05
0
0
Backup Time vs Battery Capacity
Trickle Charge Multiplier Factor
RESET Output Voltage
vs Supply Voltage
P
V
V
V
V
BATT
BAK
OUT
BATT
CC
NiCd BATTERY TRICKLE CURRENT (mA)
= 5V (LTC1558-5)
= 6V
= 100mW
1
= 1.2V
= 1.2V
NiCd CELL CAPACITY (mAHr)
125
SUPPLY VOLTAGE (V)
0.1
2
250
3
4.55V
4.7V
1
4
375
5
1558 G02
1558 G05
1558 G08
500
2
6
0.965
0.960
1.005
1.000
0.995
0.990
0.985
0.980
0.975
0.970
0.955
0.950
125
100
3.5
3.0
2.5
0.5
2.0
1.5
1.0
75
50
25
0
0
2
0
0
Boost Converter Switching
Frequency
Normalized Fast Recharge
Current vs Temperature
RESET Output Voltage
vs Supply Voltage
V
V
V
I
PK
CC
BATT
CC
= 330mA
= 3.3V (LTC1558-3.3)
= 3.3V (LTC1558-3.3)
= 1.2V
OUTPUT VOLTAGE, V
4
1
SUPPLY VOLTAGE (V)
TEMPERATURE ( C)
25
2
6
3.10V
3V
50
BAK
3
8
(V)
1558 G03
1558 G06
1558 G09
10
75
4