Datasheet

3
LT1109A
CCHARA TERIST
ICS
UW
AT
Y
P
I
CA
LPER
F
O
R
C
E
TEMPERATURE (°C)
–50
FREQUENCY (kHz)
160
140
120
100
80
60
–25
02550
1109A G02
75 100
Efficiency
Oscillator Frequency Duty Cycle
Switch Saturation Voltage
Switch Saturation Voltage
TEMPERATURE (°C)
DUTY CYCLE (%)
80
75
70
65
60
55
50
1109A G03
–50
–25
0 25 50 75 100
INPUT VOLTAGE (V)
4.2
EFFICIENCY (%)
5.8
1109A G01
4.6
5.0
5.4
90
85
80
75
70
4.4 4.8 5.2
5.6
V
IN
= 5V
V
OUT
= 12V
LOAD = 120mA
L = 29µH
I
SWITCH
(A)
0
V
CESAT
(V)
1.2
1109A G04
0.4 0.8 1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.2 0.6 1.0 1.4
V
IN
= 3V
V
IN
= 2V
V
IN
= 5V
TEMPERATURE (°C)
V
CESAT
(V)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1109A G05
–50
–25
0 25 50 75 100
I
SW
= 650mA
Switch On Time
TEMPERATURE (°C)
SWITCH ON TIME (µs)
8
7
6
5
4
3
1109A G06
–50
–25
0 25 50 75 100
Quiescent Current
TEMPERATURE (°C)
QUIESCENT CURRENT (µA)
500
450
400
350
300
250
200
1109A G07
–50
–25
0 25 50 75 100
Quiescent Current
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
500
450
400
350
300
250
16
1109A G08
4
8
12
20
26
10
14 18
T
A
= 25°C