Datasheet LTC3864 (Analog Devices) - 5

LTC3864
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Pulse-Skipping Mode Operation Burst Mode Operation Transient Response: Waveforms Waveforms Pulse-Skipping Mode Operation
VOUT VOUT ILOAD 50mV/DIV 50mV/DIV 2A/DIV VSW VSW 10V/DIV 10V/DIV VOUT 500mV/DIV IL IL 500mA/DIV IL 500mA/DIV 2A/DIV 2µs/DIV 10µs/DIV 3864 G02 100µs/DIV 3864 G03 VIN = 12V VIN = 12V VIN = 12V VOUT = 5V VOUT = 5V VOUT = 5V I 3864 G01 LOAD = 100mA ILOAD = 100mA TRANSIENT = 100mA TO 2A FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT
Transient Response: Dropout Behavior (100% Duty Burst Mode Operation Cycle) Low VIN Operation
VIN 2V/DIV ILOAD 2A/DIV V V OUT PROGRAMMED TO 5V, IN V BUT STARTS UP IN DROPOUT OUT 500mV/DIV V 1V/DIV OUT SINCE VIN < 5V 2V/DIV VOUT 1V/DIV GATE VOUT = VIN IN DROPOUT 10V/DIV IL SW 2A/DIV 5V/DIV 100µs/DIV 3864 G04 50ms/DIV 3864 G05 20ms/DIV 3864 G06 V V IN = 12V IN TRANSIENT: 12V TO 4V VIN = 0V TO 3.8V V AND BACK TO 12V OUT = 5V THEN BACK TO 0V TRANSIENT = 100mA TO 2A VOUT = 5V, ILOAD = 100mA, FIGURE 8 CIRCUIT ILOAD = 100mA FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT
Soft Start-Up into a Prebiased Normal Soft Start-Up Output Output Tracking
RUN 5V/DIV VIN 5V/DIV VOUT PREBIASED TO 2.9V SS VOUT 200mV/DIV 1V/DIV SS SS 200mV/DIV 200mV/DIV VOUT VOUT 1V/DIV 2V/DIV 1ms/DIV 3864 G07 1ms/DIV 3864 G08 20ms/DIV 3864 G09 VIN = 12V, VOUT = 5V VIN = 12V, VOUT = 5V VIN = 12V, VOUT = 5V FIGURE 8 CIRCUIT ILOAD = 0.5mA ILOAD = 100mA FIGURE 8 CIRCUIT FIGURE 8 CIRCUIT 3864fa For more information www.linear.com/LTC3864 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts