Datasheet LTC3773 (Analog Devices) - 6

LTC3773
TYPICAL PERFORMANCE CHARACTERISTICS IVDR and IVCC vs Switching Frequency IVCC and IVDR vs Load Current
120 2.6 100 VIN = 10V, VCC = VDR = 5V, IVDR FORCED CONTINUOUS MODE 100 VOUT1 = 2.5V WITH 5A LOAD 2.5 FORCED CONTINUOUS VOUT2 = 1.8V WITH 5A LOAD I V VCC OUT3 = 1.2V WITH 5A LOAD DISCONTINUOUS 80 2.4 MODE IVCC (mA) (mA) (mA) 60 2.3 VDR 10 I VDR + I 40 2.2 I VCC Burst Mode OPERATION 20 2.1 PLLFLTR = 0V PLLFLTR = 5V PLLFLTR = FLOATS 0 2.0 1 150 250 350 450 550 650 750 0.001 0.01 0.1 1 10 100 SWITCHING FREQUENCY (kHz) CHANNEL 1 LOAD CURRENT (A) 3773 G07 VIN = 12V, VCC = VDR = 5V, VOUT1 = 2.5V VOUT2 = 1.8V (NO LOAD), VOUT3 = 1.2V (NO LOAD) 3773 G08
Forced Continuous Mode Discontinuous Mode 0A to 5A 0A to 10A Load Step Load Step at 5kHz Interval
1.8V VOUT 1.8V V 50mV/DIV OUT 50mV/DIV AC COUPLED AC COUPLED IL 5A/DIV IL 5A/DIV VSW 10V/DIV I I LOAD LOAD 5A/DIV 10A/DIV 50μs/DIV 50μs/DIV V 3773 G09 IN = 12V, fSW = 220kHz V 3773 G10 IN = 12V, fSW = 220kHz
Burst Mode Operation 0A to 5A Load Step at 5kHz Interval
1.8V VOUT 50mV/DIV AC COUPLED IL 5A/DIV VSW 10V/DIV ILOAD 5A/DIV 50μs/DIV V 3773 G11 IN = 12V, fSW = 220kHz 3773fb 6