Datasheet

5
LT1956/LT1956-5
1956f
Switching Frequency
BOOST Pin Current
V
C
Pin Shutdown Threshold
Minimum Input Voltage with 5V
Output
Switch Voltage Drop
TYPICAL PERFOR A CE CHARACTERISTICS
UW
JUNCTION TEMPERATURE (°C)
–50
FREQUENCY (kHz)
50 100
1956 G10
0
25 75
575
550
525
500
475
450
425
–25 125
LOAD CURRENT (A)
0
INPUT VOLTAGE (V)
1956 G11
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
7.5
7.0
6.5
6.0
5.5
5.0
MINIMUM INPUT
VOLTAGE TO START
MINIMUM INPUT
VOLTAGE TO RUN
V
OUT
= 5V
L = 18µH
SWITCH CURRENT (A)
0 0.5 1 1.5
BOOST PIN CURRENT (mA)
1956 G12
45
40
35
30
25
20
15
10
5
0
JUNCTION TEMPERATURE (°C)
–50
1.5
1.7
2.1
25 75
1956 G13
1.3
1.1
–25 0
50 100 125
0.9
0.7
1.9
THRESHOLD VOLTAGE (V)
SWITCH CURRENT (A)
0 0.5 1 1.5
SWITCH VOLTAGE (mV)
1766 G14
450
400
350
300
250
200
150
100
50
0
T
J
= 125°C
T
J
= 25°C
T
J
= –40°C
JUNCTION TEMPERATURE (°C)
–50
SWITCH MINIMUM ON TIME (ns)
50 100
1956 G15
0
25 75
600
500
400
300
200
100
0
–25 125
Switch Minimum ON Time
vs Temperature