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| LTC3864 Datasheet, PDF (5/28 Pages) Linear Technology – 60V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability | |||
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LTC3864
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted.
Pulse-Skipping Mode Operation
Waveforms
Burst Mode Operation
Waveforms
Transient Response:
Pulse-Skipping Mode Operation
VOUT
50mV/DIV
VSW
10V/DIV
IL
500mA/DIV
2µs/DIV
VIN = 12V
VOUT = 5V
ILOAD = 100mA
FIGURE 8 CIRCUIT
Transient Response:
Burst Mode Operation
ILOAD
2A/DIV
VOUT
500mV/DIV
IL
2A/DIV
100µs/DIV
VIN = 12V
VOUT = 5V
TRANSIENT = 100mA TO 2A
FIGURE 8 CIRCUIT
Normal Soft Start-Up
VOUT
50mV/DIV
VSW
10V/DIV
ILOAD
2A/DIV
VOUT
500mV/DIV
IL
500mA/DIV
3864 G01
10µs/DIV
VIN = 12V
VOUT = 5V
ILOAD = 100mA
FIGURE 8 CIRCUIT
3864 G02
Dropout Behavior (100% Duty
Cycle)
VIN
2V/DIV
IL
2A/DIV
100µs/DIV
VIN = 12V
VOUT = 5V
TRANSIENT = 100mA TO 2A
FIGURE 8 CIRCUIT
Low VIN Operation
3864 G03
VOUT
2V/DIV
GATE
10V/DIV
VOUT = VIN IN DROPOUT
3864 G04
50ms/DIV
3864 G05
VIN TRANSIENT: 12V TO 4V
AND BACK TO 12V
VOUT = 5V, ILOAD = 100mA, FIGURE 8 CIRCUIT
Soft Start-Up into a Prebiased
Output
VIN
1V/DIV
VOUT
1V/DIV
VOUT PROGRAMMED TO 5V,
BUT STARTS UP IN DROPOUT
SINCE VIN < 5V
SW
5V/DIV
20ms/DIV
VIN = 0V TO 3.8V
THEN BACK TO 0V
ILOAD = 100mA
FIGURE 8 CIRCUIT
Output Tracking
3864 G06
VIN
5V/DIV
SS
200mV/DIV
VOUT
1V/DIV
1ms/DIV
VIN = 12V, VOUT = 5V
FIGURE 8 CIRCUIT
RUN
5V/DIV
VOUT
1V/DIV
SS
200mV/DIV
VOUT PREBIASED
TO 2.9V
3864 G07
1ms/DIV
VIN = 12V, VOUT = 5V
ILOAD = 0.5mA
FIGURE 8 CIRCUIT
SS
200mV/DIV
VOUT
2V/DIV
3864 G08
20ms/DIV
VIN = 12V, VOUT = 5V
ILOAD = 100mA
FIGURE 8 CIRCUIT
3864 G09
3864f
5
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