LTC3124_15 Datasheet, PDF (6/28 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.
Frequency Accuracy
2
1
0
–1
V_OUT = 15V
V_OUT = 3.6V
V_OUT = 2.5V
–2
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
V_IN, FALLING (V)
3124 G19
Efficiency vs Frequency
100
90
80
70
60
50
40
30
20
10
0
10
100kHz EFFICIENCY
1MHz EFFICIENCY
3MHz EFFICIENCY
100
OUTPUT CURRENT (mA)
1000
3124 G20
V_CC vs V_IN
4.5
Burst Mode Operation
CAP Pin Voltage vs V_OUT
0
–1
–2
–3
–4
–5
–6
–7
0 2 4 6 8 10 12 14
V_OUT (V)
3124 G21
Burst Mode Operation to
PWM Mode
V_OUT
4.0
100mV/DIV
AC-COUPLED
V_SWA
10V/DIV
3.5
V_OUT
50mV/DIV
AC-COUPLED
3.0
2.5
0
V_IN FALLING
V_IN RISING
1
2
3
4
V_IN (V)
PHASE A
INDUCTOR
CURRENT
500mA/DIV
5
6
3124 G22
5µs/DIV
OUTPUT CURRENT = 50mA
PWM Mode to Burst Mode
Operation
Burst Mode Transient
V_PWM/SYNC
2V/DIV
3124 G23
50µs/DIV
3124 G24
OUTPUT CURRENT = 100mA
TYPE III COMPENSATION—SEE FIGURE 10 FOR
COMPONENT VALUES
Synchronized Operation
V_OUT
50mV/DIV
AC-COUPLED
V_PWM/SYNC
2V/DIV
V_OUT
100mV/DIV
AC-COUPLED
OUTPUT
CURRENT
100mA/DIV
10mA
100mA
10mA
V_SWB
10V/DIV
V_SWA
10V/DIV
SYNCHRONIZED TO 1.3MHz
SYNCHRONIZATION SIGNAL SET TO 2.6MHz
V_PWM/SYNC
5V/DIV
50µs/DIV
3124 G25
OUTPUT CURRENT = 100mA
TYPE III COMPENSATION—SEE FIGURE 10 FOR
COMPONENT VALUES
200µs/DIV
3124 G26
1µs/DIV
OUTPUT CURRENT = 1A
3124 G27
3124f
6
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