LTC3124_15 Datasheet, PDF (4/28 Pages) Linear Technology – 15V, 5A 2-Phase Synchronous Step-Up DC/DC Converter with Output Disconnect

LTC3124
TYPICAL PERFORMANCE CHARACTERISTICS
Configured as front page application at T_A = 25°C, unless otherwise specified.
Efficiency vs Load Current,
V_OUT = 5V
100
Burst Mode
90 OPERATION
80
PWM
70
60
50
40
30
20
10
0
0.01
f_SW = 1MHz
V_IN = 4.2V
V_IN = 3.3V
V_IN = 0.6V
0.1
1
10 100
LOAD CURRENT (mA)
1000
3124 G01
Efficiency vs Load Current,
V_OUT = 7.5V
100
Burst Mode
90 OPERATION
80
70
PWM
60
50
40
30
20
10
0
0.01
f_SW = 1MHz
V_IN = 5.4V
V_IN = 3.8V
V_IN = 2.3V
0.1 1
10 100
LOAD CURRENT (mA)
1000
3124 G02
PWM Mode Operation
Load Transient Response
Efficiency vs Load Current,
V_OUT = 12V
100
90
Burst Mode
OPERATION
80
PWM
70
60
50
40
30
20
10
0
0.01
f_SW = 1MHz
V_IN = 5.4V
V_IN = 4.2V
V_IN = 2.6V
0.1
1
10 100
LOAD CURRENT (mA)
1000
3124 G03
Inrush Current Control
V_OUT
20mV/DIV
AC-COUPLED
PHASE A
INDUCTOR
CURRENT
500mA/DIV
PHASE B
INDUCTOR
CURRENT
500mA/DIV
I_LOAD = 500mA 2µs/DIV
Feedback vs Temperature
0.05
V_OUT
500mV/DIV
AC-COUPLED
OUTPUT
CURRENT
500mA/DIV
150mA
1500mA
3124 G04
R_C = 169k
C_C = 330pF
NO C_F
500µs/DIV
R_DS(ON) vs Temperature,
Both NMOS and PMOS
80
SD
5V/DIV
V_OUT
5V/DIV
INDUCTOR A
CURRENT
150mA
1A/DIV
INDUCTOR B
CURRENT
1A/DIV
3124 G05
I_LOAD = 100mA
2ms/DIV
Switching Frequency
vs Temperature
0.5
3124 G06
0
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
60
0
40
–0.5
20
–1.0
0
–20
–1.5
–0.35
–40
0
40
80
120 160
TEMPERATURE (°C)
3124 G07
–40
–50
–10 30
70 110 150
TEMPERATURE (°C)
3124 G08
–2.0
–50 –20
10 40 70 100 130 160
TEMPERATURE (°C)
3124 G09
3124f
4
For more information www.linear.com/LTC3124