Datasheet LTC3605A (Analog Devices) - 4

LTC3605A
Typical perForMance characTerisTics TA = 25°C unless otherwise specified. Efficiency vs Load Current Quiescent Current vs VIN Shutdown Current vs VIN
100 2.0 20 VIN = 12V 90 fSW = 1MHz 80 1.5 15 70 60 50 1.0 10 40 EFFICIENCY (%) 30 QUIESCENT CURRENT (mA) 0.5 SHUTDOWN CURRENT (µA) 5 20 VOUT = 3.3V 10 VOUT = 2.5V VOUT = 1.8V 0 0 0 0.01 0.1 1 10 0 4 8 12 16 20 0 4 8 12 16 20 LOAD CURRENT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 3605A G01 3605A G02 3605A G03
I R INTVCC Current vs Frequency DS(ON) vs Temperature Load Regulation
25 120 1.5 MODE = 3.3V VIN = 12V NO LOAD VOUT = 1.2V 100 1.0 INTERNAL ITH f = 1MHz 20 COMPENSATION TOP FET MODE = INTVCC (ITH = 3.3V) 80 0.5 15 (mA) (mΩ) 60 0 I INTVCC 10 BOTTOM FET R DS(ON) 40 NORMALIZED (%) –0.5 EXTERNAL ITH COMPENSATION 5 20 –1.0 0 0 –1.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 –45 –20 5 30 55 80 105 130 0 1 2 3 4 5 6 7 FREQUENCY (MHz) TEMPERATURE (°C) IOUT (A) 3605A G04 3605A G05 3605A G06
Load Step Load Step (External ITH Compensation) (Internal ITH Compensation) Output Tracking
VOUT VOUT 100mV/DIV 100mV/DIV AC-COUPLED AC-COUPLED IL IL 5A/DIV 5A/DIV VTRACK VFB ILOAD ILOAD 5A/DIV 5A/DIV VIN = 12V 20µs/DIV 3605A G07 VIN = 12V 20µs/DIV 3605A G08 VIN = 12V 500µs/DIV 3605A G09 VOUT = 1.2V VOUT = 1.2V VOUT = 1.2V ILOAD = 0.4A ILOAD = 0.4A ITH = 3.3V 3605afg 4 For more information www.linear.com/LTC3605A Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Typical Applications Package Description Revision History Typical Application Related Parts