LTC3826_15 Datasheet, PDF (5/36 Pages) Linear Technology – 30A IQ, Dual, 2-Phase Synchronous Step-Down Controller

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3826
Efficiency and Power Loss
vs Output Current
100
Burst Mode OPERATION
90
PULSE SKIPPING MODE
80
FORCED
CONTINUOUS
70
10000
1000
60
100
50
40
10
30
20
1
10
0
0.00001 0.0001 0.001 0.01
V_IN = 12V
V_OUT = 3.3V _0.1
0.1 1 10
OUTPUT CURRENT (A)
FIGURE 13 CIRCUIT
3826 G01
Efficiency vs Output Current
100
V_OUT = 3.3V
90
80
70
60
50
40
30
20
10
0
0.00001 0.0001 0.001 0.01
V_IN = 12V
V_IN = 5V
0.1 1 10
OUTPUT CURRENT (A)
FIGURE 13 CIRCUIT
3826 G02
Efficiency vs Input Voltage
98
96
94
92
90
88
86
84
82
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
FIGURE 13 CIRCUIT
35 40
3826 G03
Load Step
(Burst Mode Operation)
V_OUT
100mV/DIV
AC
COUPLED
I_L
2A/DIV
20μs/DIV
FIGURE 13 CIRCUIT
V_OUT = 3.3V
Load Step
(Forced Continuous Mode)
V_OUT
100mV/DIV
AC
COUPLED
I_L
2A/DIV
Load Step
(Pulse Skipping Mode)
V_OUT
100mV/DIV
AC
COUPLED
I_L
2A/DIV
3826 G04
20μs/DIV
FIGURE 13 CIRCUIT
V_OUT = 3.3V
3826 G05
20μs/DIV
FIGURE 13 CIRCUIT
V_OUT = 3.3V
3826 G06
Inductor Current at Light Load
FORCED
CONTINUOUS
MODE
2A/DIV
Burst Mode
OPERATION
PULSE
SKIPPING
MODE
2μs/DIV
FIGURE 13 CIRCUIT
V_OUT = 3.3V
I_LOAD = 100μA
3826 G07
Soft-Start-Up
V_OUT2
2V/DIV
V_OUT1
2V/DIV
20ms/DIV
FIGURE 13 CIRCUIT
3826 G08
Tracking Start-Up
V_OUT2
2V/DIV
V_OUT1
2V/DIV
20ms/DIV
FIGURE 13 CIRCUIT
3826 G09
3826fc
5