Datasheet

4
LT1619
1619fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Shutdown Supply Current
vs Input Voltage
Idle Mode Supply Current
vs Temperature
Frequency Deviation from
Nominal vs Temperature
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (µA)
45
40
35
30
25
20
15
10
5
16
1619 G04
4 8 12 20142 6 10 18
T
A
= –40°C
T
A
= 85°C
T
A
= 25°C
TEMPERATURE (°C)
–40
140
IDLE MODE SUPPLY CURRENT (µA)
150
160
170
180
040
80
120
1619 G05
190
200
–20 20
60
100
V
IN
= 2.5V
TEMPERATURE (°C)
–40
DEVIATION FROM NOMINAL FREQUENCY (%)
8
20
1619 G06
2
–2
–20 0 40
–4
–6
–8
–10
10
6
4
0
60 80 100
V
IN
= 2.5V
NOMINAL FREQUENCY = 300kHz
Maximum Duty Ratio
vs Temperature
Deviation from Nominal
Frequency vs Input Voltage
Current Limit Threshold
vs Temperature
TEMPERATURE (°C)
–40 –20
90
DUTY RATIO (%)
92
95
0
40
60
1619 G07
91
94
93
20
80
100
V
IN
= 2.5V
INPUT VOLTAGE (V)
0
FREQUENCY DEVIATION (%)
2
4
6
16
1619 G08
0
–2
–4
4
8
10
20
8
12
2
6
18
14
T
A
= 25°C
NOMINAL FREQUENCY = 300kHZ
TEMPERATURE (°C)
–40
CURRENT LIMIT THRESHOLD (mV)
57
20
1619 G09
54
52
–20 0 40
51
50
58
56
55
53
60 80 100
V
IN
= 2.5V
Burst Mode Operation Current
Limit Threshold vs Temperature
SENSE Pin Input Bias Current
vs Temperature
SENSE Pin Input Bias Current
vs Sense Voltage
TEMPERATURE (°C)
–40
8
10
14
20 60
1619 G10
6
4
–20 0
40 80 100
2
0
12
CURRENT LIMIT THRESHOLD (mV)
V
IN
= 2.5V
DUTY CYCLE = 0
TEMPERATURE (°C)
–40
SENSE PIN CURRENT (µA)
–115
–117
–119
–121
–123
–125
–127
–129
–131
–133
–135
0
40
60
1619 G11
–20
20
80
100
V
SENSE
= 0V
V
SENSE
(mV)
–10
SENSE PIN CURRENT (µA)
60
1619 G12
010
20 30
40 50
–90
–95
–100
–105
–110
–115
–120
–125
–130
T
A
= 25°C