Datasheet LTC3612 (Analog Devices) - 5

LTC3612
Typical perForMance characTerisTics VIN = 3.3V, RT/SYNC = SVIN, unless otherwise noted. Efficiency vs Load Current Efficiency vs Load Current (VMODE = 0V) (VMODE = 0V) Efficiency vs Load Current
100 100 100 VOUT = 1.8V VOUT = 1.2V VOUT = 1.8V 90 90 90 80 80 80 70 70 70 Burst Mode EXTERNAL 60 60 60 CLAMP = 0.7V Burst Mode 50 50 50 INTERNAL 40 40 40 CLAMP EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) PULSE- 30 30 30 SKIPPING 20 20 MODE V 20 IN = 5V VIN = 5V FORCED 10 VIN = 3.3V 10 VIN = 3.3V 10 CONTINUOUS V V MODE 0 IN = 2.5V 0 IN = 2.5V 0 1 10 100 1000 10000 1 10 100 1000 10000 1 10 100 1000 10000 OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) OUTPUT CURRENT (mA) 3612 G01 3612 G02 3612 G03
Efficiency vs Input Voltage Efficiency vs Frequency (VMODE = 0V) (VMODE = 0V), IOUT = 1A Load Regulation
100 95 1.5 VOUT = 1.8V 94 VOUT = 1.8V FORCED CONTINUOUS MODE 90 1.3 INTERNAL Burst Mode OPERATION 93 PULSE-SKIPPING MODE 92 1.1 80 91 0.9 90 70 89 0.7 88 60 ERROR (%) 0.5 87 EFFICIENCY (%) EFFICIENCY (%) V OUT 0.3 50 86 IOUT = 3mA 85 0.1 I 40 OUT = 300mA 84 1µH IOUT = 1A 0.68µH –0.1 I 83 OUT = 3A 0.33µH VOUT = 1.8V 30 82 –0.3 2.25 2.75 3.25 3.75 4.25 4.75 5.25 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 0 500 1000 1500 2000 2500 3000 INPUT VOLTAGE (V) FREQUENCY (MHz) OUTPUT CURRENT (mA) 3612 G04 3612 G05 3612 G06
Line Regulation Burst Mode Operation
0.3 0.2 VOUT 20mV/DIV 0.1 0 IL ERROR (%) 500mA/DIV V OUT –0.1 20µs/DIV 3612 G08 VOUT = 1.8V IOUT = 75mA –0.2 VMODE = 0V –0.32.20 2.75 3.30 3.85 4.40 4.95 5.50 INPUT VOLTAGE (V) 3612 G07 3612fc For more information www.linear.com/LTC3612 5 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Package Description Typical Application Related Parts