Datasheet LTC3853 (Analog Devices) - 6

LTC3853
TYPICAL PERFORMANCE CHARACTERISTICS Tracking Up and Down Prebiased Output at 2V Coincident Tracking with External Ramp
VOUT TK/SS1 1V/DIV TK/SS2 RUN1 TK/SS3 2V/DIV 2V/DIV VTK/SS 500mV/DIV V V V FB OUT1,2,3 OUT1,2,3 500mV/DIV 1V/DIV 1V/DIV 50ms/DIV 3853 G08 V 3853 G09 3853 G10 IN = 12V 10ms/DIV VIN = 12V 5ms/DIV VOUT1 = 3.3V VOUT1 = 3.3V VOUT2 = 2.5V VOUT2 = 2.5V VOUT3 = 1.8V VOUT3 = 1.8V
Quiescent Current Current Sense Threshold vs Input Voltage Without EXTVCC Internal VCC Line Regulation vs ITH Voltage
6.0 5.25 80 I 5.00 LIM = INTVCC 60 5.5 4.75 ILIM = FLOAT (V) 40 CC 4.50 (mV) 5.0 20 Y CURRENT (mA) 4.25 V SENSE ILIM = GND INTERNAL V 0 SUPPL 4.00 4.5 3.75 –20 4.0 3.50 –40 5 10 15 20 25 0 5 10 15 20 25 0 0.5 1 1.5 2 INPUT VOLTAGE (V) INPUT VOLTAGE (V) VITH (V) 3853 G11 3853 G12 3853 G13
Maximum Current Sense Threshold Maximum Current Sense Maximum Current Sense Voltage vs vs Common Mode Voltage Threshold vs Duty Cycle Feedback Voltage (Current Foldback)
80 100 80 ILIM = INTVCC 70 ILIM = INTVCC 90 70 80 I 60 LIM = INTVCC 60 ILIM = FLOAT 70 I 50 LIM = FLOAT 60 50 ILIM = FLOAT 40 50 40 ILIM = GND I 30 40 LIM = GND ILIM = GND 30 30 20 20 20 CURRENT SENSE THRESHOLD (mV) 10 CURRENT SENSE THRESHOLD (mV) 10 10 MAXIMUM CURRENT SENSE VOLTAGE (mV) 0 0 0 0 1 2 3 4 5 0 20 40 60 80 100 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 VSENSE COMMON MODE VOLTAGE (V) DUTY CYCLE (%) FEEDBACK VOLTAGE (V) 3853 G14 3853 G15 3853 G16 3853fc 6 For more information www.linear.com/LTC3853 Document Outline Features Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts