Datasheet LTC3646, LTC3646-1 (Analog Devices) - 5

LTC3646/LTC3646-1
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, SVIN/PVIN = 12V, fO = 1MHz unless otherwise noted. Efficiency vs Load Current, Efficiency vs Load Current, Burst Mode Operation Forced Continuous Mode Operation Efficiency vs Load Current
100 100 100 VOUT = 1.8V VOUT = 1.8V 90 f Burst Mode OPERATION O = 1.5MHz 90 fO = 1.5MHz 90 80 80 80 70 70 70 60 60 60 50 50 50 40 40 40 FORCED CONTINUOUS EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) OPERATION 30 30 30 20 V 20 20 IN = 5V VIN = 5V 10 VIN = 8V 10 VIN = 8V 10 VOUT = 5V VIN = 12V VIN = 12V VOUT = 3.3V 0 0 0 0.001 0.01 0.1 1 0.001 0.01 0.1 1 0.001 0.01 0.1 1 LOAD CURRENT (A) LOAD CURRENT (A) LOAD CURRENT (A) 36461 G01 36461 G02 36461 G03
Efficiency vs Input Voltage, Reference Voltage Burst Mode Operation vs Temperature RDS(ON) vs Temperature
100 608 0.35 95 606 0.30 LOAD = 500mA MAIN SWITCH 90 604 0.25 85 LOAD = 1A 602 0.20 80 (mV) 600 ANCE (Ω) V REF 0.15 EFFICIENCY (%) 75 598 LOAD = 100mA RESIST 0.10 70 SYNCHRONOUS SWITCH 596 65 L = 6.8µH 0.05 594 VOUT = 3.3V 60 592 0 0 5 10 15 20 25 30 35 40 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –30 –10 10 30 50 70 90 110 130 150 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 36461 G04 36461 G05 36461 G06
Switch Pin Leakage Oscillator Internal Set Frequency Oscillator Externally Set Frequency vs Temperature and Supply vs Temperature vs Temperature
20 2.50 1.8 VDS = 12V, MAIN SWITCH VRT = VINTVCC RRT = 60k 18 VDS = 12V, SYNCHRONOUS SWITCH 2.45 V 1.7 16 DS = 40V, MAIN SWITCH V 2.40 DS = 40V, SYNCHRONOUS SWITCH 14 2.35 1.6 12 2.30 10 2.25 1.5 8 2.20 1.4 6 FREQUENCY (MHz) 2.15 FREQUENCY (MHz) SW LEAKAGE CURRENT (µA) 4 2.10 1.3 2 2.05 0 2.00 1.2 –50 –30 –10 10 30 50 70 90 110 130 150 –40 –20 0 20 40 60 80 100 120 140 –40 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 36461 G07 36461 G08 36461 G09 36461fc For more information www.linear.com/LTC3646 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 Typical Applications Typical Application Related Parts