Datasheet LTC3425 (Analog Devices) - 4

LTC3425
W U TYPICAL PERFOR A CE CHARACTERISTICS SW Pin and Inductor Current in Discontinous Mode. Antiring SWA, SWB, SWC, SWD Circuit Eliminates High Frequency at 1MHz/Phase SW Pin and Oscillator SYNCOUT Ringing
IL SWA 0.2A/DIV 2V/DIV SWA TO SWD 5V/DIV SYNCOUT 2V/DIV SW 2V/DIV 250ns/DIV 3425 G01 250ns/DIV 3425 G02 VIN = 2.4V 250ns/DIV 3425 G03 VOUT = 3.3V COUT = 220µF
Output Voltage Ripple at 2.5A Output Voltage Ripple at 2.5A Transient Response 0.5A to 1.5A Load with Only Four 4.7
µ
F Load with a 47
µ
F Ceramic Bulk Fixed Frequency Mode Operation Ceramic Capacitors Capacitor
VOUT AC 100mV/DIV VOUT AC VOUT AC 50mV/DIV 10mV/DIV LOAD CURRENT 0.5A/DIV VIN = 2.4V 100µs/DIV 3425 G04 VIN = 2.4V 500ns/DIV 3425 G05 VIN = 2.4V 500ns/DIV 3425 G06 VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V COUT = 220µF FREQUENCY = 1MHz/PHASE FREQUENCY = 1MHz/PHASE
Soft-Start and Inrush Current Transient Response 10mA to 1A Limiting Burst Mode Operation Automatic Burst Mode Operation
I I IN OUT 0.5A/DIV 1A/DIV SWA 2V/DIV SS Pin BURST PIN 1V/DIV 1V/DIV VOUT AC VOUT 50mV/DIV 2V/DIV VOUT AC 200mV/DIV VIN = 2.4V 500µs/DIV 3425 G07 VIN = 2.4V 25µs/DIV 3425 G08 VIN = 2.4V 1ms/DIV 3425 G10 VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V CSOFTSTART = 0.015µF COUT = 220µF COUT = 220µF 3425f 4