LTC3122_15 Datasheet, PDF (4/26 Pages) Linear Technology – 15V, 2.5A Synchronous Step-Up DC/DC Converter with Output Disconnect

LTC3122
Typical Performance Characteristics
Configured as front page application unless otherwise specified.
Efficiency vs Load Current,
V_OUT = 5V
100
90
BURST
80
70
60
50
PWM
40
30
20
10
0
0.01
V_IN = 4.2V
V_IN = 3.3V
V_IN = 0.6V
0.1 1 10 100 1000 10000
LOAD CURRENT (mA)
3122 G01
Efficiency vs Load Current,
V_OUT = 7.5V
100
90
BURST
80
70
60
50
PWM
40
30
20
10
0
0.01
V_IN = 5.4V
V_IN = 3.8V
V_IN = 2.3V
0.1 1 10 100 1000 10000
LOAD CURRENT (mA)
3122 G02
Efficiency vs Load Current,
V_OUT = 12V
100
90
BURST
80
70
60
50
PWM
40
30
20
10
0
0.01
V_IN = 5.4V
V_IN = 4.2V
V_IN = 2.6V
0.1
1
10
100 1000
LOAD CURRENT (mA)
3122 G03
PWM Mode Operation
Load Transient Response
Inrush Current Control
V_OUT
20mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
1A/DIV
V_OUT
500mV/DIV
AC-COUPLED
1µs/DIV
I_LOAD = 200mA
3122 G04
OUTPUT
CURRENT
500mA/DIV
80mA
800mA
500µs/DIV
SD
5V/DIV
V_OUT
5V/DIV
80mA
INPUT
CURRENT
1A/DIV
3122 G05
2ms/DIV
3122 G06
Feedback vs Temperature
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
–0.6
–60
–10
40
90
TEMPERATURE (°C)
140
3122 G07
4
R_DS(ON) vs Temperature,
Both NMOS and PMOS
80
60
40
20
0
–20
–40
–50
–10 30
70 110 150
TEMPERATURE (°C)
3122 G08
Oscillator Frequency
vs Temperature
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–60
–10
40
90
TEMPERATURE (°C)
140
3122 G09
3122fa
For more information www.linear.com/LTC3122