Datasheet LTC3875 (Analog Devices) - 6

LTC3875
TYPICAL PERFORMANCE CHARACTERISTICS Load Step Efficiency vs Output Current and Efficiency vs Output Current and (Figure 16 Application Circuit) Mode (Figure 16 Application Circuit) Mode (Figure 16 Application Circuit) (Burst Mode Operation)
100 100 90 Burst Mode 90 ILOAD OPERATION 40A/DIV 80 80 Burst Mode 5A TO 30A 70 70 OPERATION 60 60 IL1, IL2 CCM CCM 10A/DIV 50 50 PULSE-SKIPPING 40 40 PULSE- EFFICIENCY (%) EFFICIENCY (%) SKIPPING VOUT 30 30 100mV/DIV AC-COUPLED 20 20 10µs/DIV 3875 G03 VIN = 12V 10 VIN = 12V 10 VIN = 12V V V OUT = 1.5V OUT = 1.5V VOUT = 1V 0 0 0.01 0.1 1 10 100 0.01 0.1 1 10 100 LOAD CURRENT (A) LOAD CURRENT (A) 3875 G01 3875 G02
Load Step Load Step (Figure 16 Application Circuit) (Figure 16 Application Circuit) (Forced Continuous Mode) (Pulse-Skipping Mode) Prebiased Output at 1V
ILOAD ILOAD 40A/DIV 40A/DIV VOUT 5A TO 30A 5A TO 30A 1V/DIV IL1, IL2 IL1, IL2 10A/DIV 10A/DIV VOSNS+ VOUT V 500mV/DIV OUT 100mV/DIV 100mV/DIV TK/SS AC-COUPLED AC-COUPLED 500mV/DIV 10µs/DIV 3875 G04 VIN = 12V 10µs/DIV 3875 G05 VIN = 12V 2.5ms/DIV 3875 G06 VIN = 12V VOUT = 1.5V VOUT = 1.5V VOUT = 1.5V CCM: NO LOAD
Tracking Up and Down Quiescent Current Coincident Tracking with External Ramp vs Temperature without EXTVCC
10.0 TK/SS1 9.5 TK/SS2 RUN 2V/DIV 9.0 2V/DIV 8.5 VOUT2 8.0 VOUT1 7.5 VOUT1 V 7.0 OUT1 VOUT2 VOUT1 VOUT2 VOUT2 6.5 1V/DIV 500mV/DIV SUPPLY CURRENT (mA) 6.0 2.5ms/DIV 3875 G07 VIN = 12V 10ms/DIV 3875 G08 VIN = 12V VOUT1 = 1.5V, RLOAD = 12Ω, CCM VOUT1 = 1V, 1Ω LOAD 5.5 VOUT2 = 1V, RLOAD = 6Ω, CCM VOUT2 = 1.5V, 1.5Ω LOAD 5.0–50 –30 –10 10 30 50 70 90 110 130 TEMPERATURE (°C) 3875 G09 3875fb 6 For more information www.linear.com/LTC3875 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Related Parts