LTC3122_15 Datasheet, PDF (5/26 Pages) Linear Technology – 15V, 2.5A Synchronous Step-Up DC/DC Converter with Output Disconnect

Typical Performance Characteristics
PWM Mode Maximum Output
Current vs V_IN
2.0
1.8
V_OUT = 5V
V_OUT = 7.5V
1.6
V_OUT = 12V
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0.5 1.5 2.5 3.5 4.5 5.5
V_IN (V)
3122 G10
Peak Current Limit Change
vs Temperature
2
1
0
–1
–2
–3
–4
–50
–10 30
70 110 150
TEMPERATURE (°C)
3122 G11
Burst Mode Maximum Output
Current vs V_IN
350
V_OUT = 2.2V
300
V_OUT = 5V
V_OUT = 7.5V
V_OUT = 12V
250
200
150
100
50
0
0.5 1.5 2.5 3.5 4.5 5.5
V_IN, FALLING (V)
3122 G13
Burst Mode No Load Input Current
vs V_IN
10000
V_OUT = 5V
V_OUT = 7.5V
V_OUT = 12V
1000
100
10
0.5
1.5 2.5 3.5 4.5 5.5
V_IN, FALLING (V)
3122 G14
LTC3122
PWM Operation No Load Input
Current vs V_IN
70
V_OUT = 5V
60
V_OUT = 7.5V
V_OUT = 12V
50
40
30
20
10
0
0
1
2
3
4
5
6
V_IN (V)
3122 G12
Burst Mode Quiescent Current
Change vs Temperature
75
60
45
30
15
0
–15
–50
–10 30
70 110 150
TEMPERATURE (°C)
3122 G14
SD Pin Threshold
V_OUT
5V/DIV
900mV
V_SD
500mV/DIV
400mV
1s/DIV
3122 G16
Frequency vs RT
3.0
2.5
12
FREQUENCY
PERIOD
10
2.0
8
1.5
6
1.0
4
0.5
2
0
0
0 100 200 300 400 500 600
R_T (kΩ)
3122 G17
For more information www.linear.com/LTC3122
Frequency Accuracy
4
V_OUT = 15V
3
V_OUT = 3.6V
V_OUT = 2.2V
2
1
0
–1
–2
–3
–4
0
1
2
3
4
V_IN FALLING (V)
5
6
3122 G18
3122fa
5