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| LTC3850-1_15 Datasheet, PDF (6/38 Pages) Linear Technology – Dual, 2-Phase Synchronous Step-Down Switching Controller | |||
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LTC3850/LTC3850-1
TYPICAL PERFORMANCE CHARACTERISTICS
Load Step
(Burst Mode Operation)
ILOAD
2A/DIV
200mA TO 2.5A
IL
2A/DIV
VOUT
100mV/DIV
AC COUPLED
40µs/DIV
CIRCUIT OF FIGURE 14
VIN = 12V, VOUT = 1.8V
38501 G04
Load Step
(Forced Continuous Mode)
ILOAD
2A/DIV
200mA TO 2.5A
IL
2A/DIV
VOUT
100mV/DIV
AC COUPLED
40µs/DIV
CIRCUIT OF FIGURE 14
VIN = 12V, VOUT = 1.8V
38501 G05
Load Step
(Pulse-Skipping Mode)
ILOAD
2A/DIV
200mA TO 2.5A
IL
2A/DIV
VOUT
100mV/DIV
AC COUPLED
40µs/DIV
CIRCUIT OF FIGURE 14
VIN = 12V, VOUT = 1.8V
38501 G06
Inductor Current at Light Load
FORCED
CONTINUOUS
MODE
2A/DIV
Burst Mode
OPERATION
2A/DIV
PULSE-SKIPPING
MODE
2A/DIV
1µs/DIV
CIRCUIT OF FIGURE 14
VIN = 12V, VOUT = 1.8V
ILOAD = 100µA
38501 G07
Prebiased Output at 2V
VOUT
2V/DIV
VFB
500mV/DIV
VTK/SS
500mV/DIV
2.5ms/DIV
38501 G08
Coincident Tracking
RUN1
2V/DIV
VOUT1, 3.3V
3⦠LOAD, 1V/DIV
VOUT2, 1.8V
1.5⦠LOAD
1V/DIV
1ms/DIV
38501 G09
38501fc
6
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