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| LTC3827 Datasheet, PDF (5/36 Pages) Linear Technology – Low IQ, Dual, 2-Phase Synchronous Step-Down Controller | |||
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TYPICAL PERFORMANCE CHARACTERISTICS
LTC3827
Efï¬ciency and Power Loss
vs Output Current
100
Burst Mode OPERATION
90
FORCED CONTINUOUS MODE
PULSE SKIPPING MODE
80
10000
1000
70
60
100
50
40
10
30 VIN = 12V
VOUT = 3.3V
20
1
10
0
0.001 0.01
FIGURE 13 CIRCUIT
0.1
0.1 1 10 100 1000 10000
LOAD CURRENT (mA)
3827 G01
Load Step
(Burst Mode Operation)
Efï¬ciency vs Load Current
100
VIN = 12V
VIN = 5V
90
VOUT = 3.3V
80
70
60
50
40
0.001 0.01
FIGURE 13 CIRCUIT
0.1 1 10 100 1000 10000
LOAD CURRENT (mA)
3827 G02
Load Step
(Forced Continuous Mode)
Efï¬ciency vs Input Voltage
98
96
94
92
90
88
86
84 VOUT = 3.3V
FIGURE 13 CIRCUIT
82
0 5 10 15 20 25 30
INPUT VOLTAGE (V)
35 40
3827 G03
Load Step
(Pulse Skip Mode)
VOUT
100mV/DIV
AC
COUPLED
VOUT
100mV/DIV
AC
COUPLED
IL
2A/DIV
IL
2A/DIV
20μs/DIV
VOUT = 3.3V
FIGURE 13 CIRCUIT
3827 G04
20μs/DIV
VOUT = 3.3V
FIGURE 13 CIRCUIT
Inductor Current at Light Load
Soft Start-Up
FORCED
CONTINUOUS
MODE
2A/DIV
BURST MODE
OPERATION
PULSE
SKIPPING
MODE
4μs/DIV
VOUT = 3.3V
ILOAD = 300μA
FIGURE 13 CIRCUIT
3827 G07
20ms/DIV
FIGURE 13 CIRCUIT
VOUT
100mV/DIV
AC
COUPLED
3827 G05
IL
2A/DIV
20μs/DIV
VOUT = 3.3V
FIGURE 13 CIRCUIT
VOUT2
2V/DIV
VOUT1
2V/DIV
Tracking Start-Up
3827 G08
20ms/DIV
FIGURE 13 CIRCUIT
3827 G06
VOUT2
2V/DIV
VOUT1
2V/DIV
3827 G09
3827ff
5
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