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| LTC3811_15 Datasheet, PDF (6/48 Pages) Linear Technology – High Speed Dual, Multiphase Step-Down DC/DC Controller | |||
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LTC3811
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step (Pulse Skip Mode)
VOUT
50mV/DIV
AC COUPLED
Load Step (Forced Continuous)
Load Step (Forced Continuous
with Voltage Positioning)
VOUT
50mV/DIV
AC COUPLED
VOUT
50mV/DIV
AC COUPLED
IL
5A/DIV
VIN = 12V
20μs/DIV
VOUT = 1.5V
ILOAD = 0.5A TO 8A
IL
5A/DIV
3811 G01
VIN = 12V
20μs/DIV
VOUT = 1.5V
ILOAD = 0.5A TO 8A
3811 G02
IL1
5A/DIV
IL2
5A/DIV
VIN = 12V
50μs/DIV
VOUT = 1.5V (2-PHASE)
ILOAD = 0A TO 15A
3811 G03
Low Duty Cycle Waveforms
Light Load Waveforms
(Forced Continuous Mode)
Light Load Waveforms
(Pulse Skip Mode)
SW
10V/DIV
IL
2A/DIV
VIN = 20V
VOUT = 1.2V
ILOAD = 1.5A
250ns/DIV
SW
5V/DIV
VOUT
20mV/DIV
AC COUPLED
IL
5A/DIV
3811 G04
VIN = 12V
VOUT = 1.5V
ILOAD = 300mA
1μs/DIV
SW
5V/DIV
VOUT
20mV/DIV
AC COUPLED
IL
5A/DIV
3811 G05
VIN = 12V
VOUT = 1.5V
ILOAD = 300mA
1μs/DIV
Efï¬ciency vs Load Current with
RSENSE = 1.5mΩ
100
VIN = 12V
95 VOUT = 2V
90
85
80
75
70
65
60
1
DISCONTINUOUS
FORCED CONTINUOUS
10
100
LOAD CURRENT (A)
3811 G07
Efï¬ciency vs Load Current with
DCR Sensing
100
VIN = 12V
95 VOUT = 2V
90
85
80
75
70
65
60
1
DISCONTINUOUS
FORCED CONTINUOUS
10
100
LOAD CURRENT (A)
3811 G08
Short-Circut Waveforms
IL
5A/DIV
PGOOD
5V/DIV
VOUT
1V/DIV
VIN = 12V
VOUT = 1.5V
200μs/DIV
3811 G06
3811 G09
3811f
6
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