Datasheet LTC3856 (Analog Devices) - 7

LTC3856
Typical perForMance characTerisTics Quiescent Current vs Input Load Step without AVP Load Step with AVP Voltage without EXTVCC
4.5 108mV 4.3 VOUT VOUT 4.1 50mV/DIV 50mV/DIV 54mV 3.9 3.7 50A 50A 3.5 3.3 IL I 25A L 25A 3.1 20A/DIV 20A/DIV QUIESCENT CURRENT (mA) 2.9 3856 G07 3856 G07a 100µs/DIV 100µs/DIV VIN = 12V VIN = 12V 2.7 VOUT = 1.5V VOUT = 1.5V 2.5 5 10 15 20 25 30 35 40 INPUT VOLTAGE (V) 3856 G08
Current Sense Threshold Maximum Current Sense Threshold INTVCC Line Regulation vs ITH Voltage vs Common Mode Voltage
5.25 80 80 I 5.00 LIM = INTVCC 70 ILIM = INTVCC 60 4.75 60 4.50 ILIM = FLOAT I 40 LIM = FLOAT 50 TAGE (V) 4.25 (mV) 20 40 VOL 4.00 ILIM = GND ILIM = GND V CC V SENSE 30 INT 3.75 0 3.50 20 –20 3.25 CURRENT SENSE THRESHOLD (mV) 10 3.00 –40 0 0 5 10 15 20 25 30 35 40 0 0.5 1 1.5 2 0 1 2 3 4 5 INPUT VOLTAGE (V) VITH (V) VSENSE COMMON MODE VOLTAGE (V) 3856 G09 3856 G10 3856 G11
Maximum Current Sense Voltage Maximum Current Sense Voltage vs Feedback Voltage TK/SS Pull-Up Current vs Duty Cycle (Current Foldback) vs Temperature
100 100 1.5 90 90 80 ILIM = INTVCC 80 ILIM = INTVCC 1.4 70 70 60 60 1.3 ILIM = FLOAT ILIM = FLOAT 50 50 40 40 1.2 ILIM = GND ILIM = GND 30 30 TK/SS CURRENT (µA) 20 20 1.1 10 10 MAXIMUM CURRENT SENSE VOLTAGE (mV) MAXIMUM CURRENT SENSE VOLTAGE (mV) 0 0 1.0 0 10 20 30 40 50 60 70 80 90 100 0 0.1 0.2 0.3 0.4 0.5 0.6 –50 –25 0 25 50 75 100 125 DUTY CYCLE (%) FEEDBACK VOLTAGE (V) TEMPERATURE (°C) 3856 G12 3856 G13 3856 G14 3856fa For more information www.linear.com/LTC3856 7 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 Application Typical Application Related Parts