Datasheet

LTC3122
5
3122fa
For more information www.linear.com/LTC3122
Typical perForMance characTerisTics
Burst Mode Maximum Output
Current vs V
IN
Burst Mode No Load Input Current
vs V
IN
Burst Mode Quiescent Current
Change vs Temperature
SD Pin Threshold Frequency vs RT Frequency Accuracy
PWM Mode Maximum Output
Current vs V
IN
Peak Current Limit Change
vs Temperature
PWM Operation No Load Input
Current vs V
IN
V
IN
(V)
0.5
OUTPUT CURRENT (A)
2.0
1.8
0.8
0.6
0.4
1.6
1.4
1.2
1.0
0.2
0
3.5 4.51.5
3122 G10
2.5 5.5
V
OUT
= 5V
V
OUT
= 7.5V
V
OUT
= 12V
V
IN
(V)
0
INPUT CURRENT (mA)
70
40
30
20
60
50
10
0
4 521
3122 G12
3 6
V
OUT
= 5V
V
OUT
= 7.5V
V
OUT
= 12V
V
IN
, FALLING (V)
0.5
OUTPUT CURRENT (mA)
350
200
150
100
300
250
50
0
4.52.51.5
3122 G13
3.5 5.5
V
OUT
= 2.2V
V
OUT
= 5V
V
OUT
= 7.5V
V
OUT
= 12V
V
IN
, FALLING (V)
0.5
INPUT CURRENT (µA)
10000
1000
100
10
4.52.51.5
3122 G14
3.5 5.5
V
OUT
= 5V
V
OUT
= 7.5V
V
OUT
= 12V
TEMPERATURE (°C)
–50
CHANGE IN CURRENT FROM 25°C (%)
75
60
45
30
15
0
–15
70 110–10
3122 G14
30 150
TEMPERATURE (°C)
–50
PEAK CURRENT LIMIT CHANGE FROM 25°C (%)
2
1
0
–1
–2
–3
–4
70 110–10
3122 G11
30 150
R
T
(kΩ)
0
FREQUENCY (MHz)
PERIOD (µs)
3.0
2.0
1.5
1.0
2.5
0.5
0
12
8
6
4
10
2
0
400200100
3122 G17
300 600500
FREQUENCY
PERIOD
V
IN
FALLING (V)
0
CHANGE IN FREQUENCY (%)
4
2
1
0
–1
3
–2
–3
–4
421
3122 G18
3 65
V
OUT
= 15V
V
OUT
= 3.6V
V
OUT
= 2.2V
1s/DIV
3122 G16
V
OUT
5V/DIV
V
SD
500mV/DIV
900mV
400mV