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