LT1109
ELECTRICAL CHARACTERISTICS
T
A
= 25°C, V
IN
= 3V (LT1109CN8, LT1109CS8), unless otherwise specified.
SYMBOL
V
IH
V
IL
I
IH
I
IL
PARAMETER
Switch Leakage Current
SHUTDOWN Pin High
SHUTDOWN Pin Low
SHUTDOWN Pin Input Current
SHUTDOWN Pin Input Current
CONDITIONS
V
SW
= 12V
N8, S8 Package
N8, S8 Package
N8, S8 Package, V
SHUTDOWN
= 4V
N8, S8 Package, V
SHUTDOWN
= 0V
q
q
q
q
MIN
2.0
TYP
1
MAX
10
0.8
10
20
UNITS
µA
V
V
µA
µA
The
q
denotes the specifications which apply over the full operating
temperature range.
TYPICAL PERFOR A CE CHARACTERISTICS
Oscillator Frequency
160
140
OSCILLATOR FREQUENCY (kHz)
FREQUENCY (kHz)
124
122
120
118
116
114
112
120
SWITCH ON TIME (µs)
0
2
4
6
8
10 12 14 16 18 20
LT1109 • TPC03
100
80
60
–50
–25
0
25
50
TEMPERATURE (°C)
LT1109 • TPC02
Duty Cycle
70
65
60
700
600
500
DUTY CYCLE (%)
V
CESAT
(mV)
400
300
200
100
0
–50
50
45
40
35
30
–50
–25
0
25
50
75
100
V
CESAT
(V)
55
TEMPERATURE (°C)
LT1109 • TPC05
U W
75
Oscillator Frequency
130
128
126
6
7
Switch ON Time
5
4
100
110
INPUT VOLTAGE (V)
3
–50
–25
0
25
50
75
100
TEMPERATURE (°C)
LT1109 • TPC04
Switch Saturation Voltage
1.2
I
SW
= 500mA
1.0
0.8
0.6
0.4
0.2
0
–25
0
25
50
75
100
Switch Saturation Voltage
V
IN
= 5V
T
A
= 25°C
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
SWITCH CURRENT (A)
LT1109 • TPC07
TEMPERATURE (°C)
LT1109 • TPC06
3
LINER [ LINEAR TECHNOLOGY ]
