LT1579 LINER [Linear Technology], LT1579 Datasheet - Page 7

• Manufacturer Part Number: LT1579
• Description: 300mA Dual Input Smart Battery Backup Regulator
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFORMANCE CHARACTERISTICS
1.5
2.5
2.0
1.0
0.5
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
8
7
6
5
4
3
2
0
1
– 50 – 25
– 50
0
Ground Pin Current
Shutdown Pin Current
Secondary Select Pin Current
V
V
V
SS
IN1
SHDN
–25
= 0V
= V
50
= 0V
IN2
OUTPUT CURRENT (mA)
0
0
= V
TEMPERATURE ( C)
TEMPERATURE ( C)
100
OUT(NOMINAL)
25
25
150
50
50
200
+ 1V
75
75
W
250
100
100
1579 G16
1579 G19
1579 G37
U
125
125
300
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
0
0
1 A
– 50
– 50
Minimum Input Voltage
Logic Flag Output Voltage
(Output Low)
Secondary Select Threshold
(Switch to V
I
LOAD
–25
–25
= 1mA
10 A
LOGIC FLAG SINK CURRENT
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
IN2
25
25
)
100 A
50
50
75
75
1mA
100
100
1579 G17
1579 G14
1579 G20
10mA
125
125
1.0
0.8
0.6
0.4
0.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1.2
1.0
0.4
0.8
0.6
0.2
0
0
0
– 50 – 25
– 50
– 50
Shutdown Pin Threshold
Secondary Select Threshold
(Switch to V
Logic Flag Output Voltage
(Output Low)
I
LOAD
– 25
–25
= 1mA
0
0
0
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
IN1
I
I
SINK
SINK
25
25
25
)
= 20 A
I
= 5mA
LOAD
I
50
50
LOAD
50
LT1579
= 1mA
= 300mA
75
75
75
100
100
100
1579 G21
1579 G15
1579 G18
7
125
125
125