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| LTC3834 Datasheet, PDF (5/28 Pages) Linear Technology – 30μA IQ Synchronous Step-Down Controller | |||
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LTC3834
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Load Step (Burst Mode Operation)
Load Step
(Forced Continuous Mode)
Load Step (Pulse Skipping Mode)
VOUT
100mV/DIV
AC
COUPLED
VOUT
100mV/DIV
AC
COUPLED
VOUT
100mV/DIV
AC
COUPLED
IL
2A/DIV
IL
2A/DIV
IL
2A/DIV
VOUT = 3.3V
20μs/DIV
FIGURE 11 CIRCUIT
3834 G04
VOUT = 3.3V
20μs/DIV
FIGURE 11 CIRCUIT
Inductor Current at Light Load
FORCED
CONTINUOUS
MODE
2A/DIV
Burst Mode
OPERATION
Soft Start-Up
VOUT
1V/DIV
3834 G05
VOUT = 3.3V
20μs/DIV
FIGURE 11 CIRCUIT
Tracking Start-Up
3834 G06
MASTER
2V/DIV
VOUT
2V/DIV
PULSE
SKIPPING
MODE
VOUT = 3.3V
2μs/DIV
ILOAD = 100μA
FIGURE 11 CIRCUIT
3834 G07
20ms/DIV
FIGURE 11 CIRCUIT
3834 G08
20ms/DIV
FIGURE 11 CIRCUIT
3834 G09
Total Input Supply Current vs
Input Voltage
350
FIGURE 11 CIRCUIT
300
250
200
150
300μA LOAD
100
50
NO LOAD
0
5 10 15 20 25 30 35
INPUT VOLTAGE (V)
3834 G10
EXTVCC Switchover and INTVCC
Voltages vs Temperature
6.0
5.8
5.6
5.4
INTVCC
5.2
5.0
4.8
EXTVCC RISING
4.6
4.4
EXTVCC FALLING
4.2
4.0
â45 â25 â5 15 35 55 75 95
TEMPERATURE (°C)
3834 G11
INTVCC Line Regulation
5.5
5.4
5.3
5.2
5.1
5.0
0
5 10 15 20 25 30 35 40
INPUT VOLTAGE (V)
3834 G12
3834fb
5
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