Datasheet LTC3851A-1 (Analog Devices) - 5

LTC3851A-1
Typical perForMance characTerisTics Efficiency vs Output Current Efficiency vs Output Current and Mode and Mode
100 100 VIN = 12V 90 VOUT = 1.5V 90 BURST 80 80 BURST 70 70 60 PULSE 60 SKIP PULSE 50 50 SKIP CCM 40 40 EFFICIENCY(%) CCM EFFICIENCY(%) 30 30 20 20 VIN = 12V 10 10 VOUT = 3.3V FIGURE 11 CIRCUIT 0 0 10 100 1000 10000 100000 10 100 1000 10000 100000 LOAD CURRENT (mA) LOAD CURRENT (mA) 3851A1 G01 3851A1 G02
Efficiency vs Output Current Efficiency and Power Loss and Mode vs Input Voltage
100 100 10000 90 EFFICIENCY, 95 80 IOUT = 5A POWER LOSS, BURST IOUT = 5A 70 POWER LOSS (mW) 90 60 PULSE SKIP 50 85 1000 CCM EFFICIENCY, 40 IOUT = 0.5A EFFICIENCY (%) EFFICIENCY (%) 80 30 POWER LOSS, I 20 OUT = 0.5A 75 VIN = 12V 10 VIN = 12V VOUT = 3.3V V FIGURE 11 CIRCUIT 0 OUT = 5V 70 100 10 100 1000 10000 100000 4 8 12 16 20 24 28 32 LOAD CURRENT (mA) INPUT VOLTAGE (V) 3851A1 G03 3851A1 G04
Load Step Load Step (Burst Mode Operation) (Forced Continuous Mode)
ILOAD ILOAD 5A/DIV 5A/DIV 0.2A TO 7.5A 0.2A TO 7.5A IL IL 5A/DIV 5A/DIV VOUT VOUT 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED V 3851A1 G05 3851A1 G06 OUT = 1.5V 100µs/DIV VOUT = 1.5V 100µs/DIV VIN = 12V VIN = 12V FIGURE 11 CIRCUIT FIGURE 11 CIRCUIT 3851a1fa 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts