Datasheet LTC3729 (Analog Devices) - 5

LTC3729
TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Output Current Efficiency vs Output Current Efficiency vs Input Voltage (Figure 12) (Figure 12) (Figure 12)
100 100 100 VOUT = 3.3V VEXTVCC = 5V VEXTVCC = 5V 80 90 IOUT = 20A VIN = 5V f = 250kHz VIN = 8V VEXTVCC = 0V 90 60 V 80 IN = 12V VIN = 20V 40 70 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 80 20 VOUT = 3.3V V 60 EXTVCC = 5V IOUT = 20A VOUT = 3.3V f = 250kHz f = 250kHz 0 50 70 0.1 1 10 100 1 10 100 5 10 15 20 OUTPUT CURRENT (A) OUTPUT CURRENT (A) VIN (V) 3729 G01 3729 G02 3729 G03
Supply Current vs Input Voltage INTVCC and EXTVCC Switch and Mode EXTVCC Voltage Drop Voltage vs Temperature
1000 250 5.05 INTVCC VOLTAGE 5.00 800 200 4.95 600 150 4.90 ON SWITCH VOLTAGE (V) CC 400 4.85 VOLTAGE DROP (mV) 100 CC SUPPLY CURRENT (µA) 4.80 200 EXTV 50 AND EXTV EXTV CC CC SWITCHOVER THRESHOLD 4.75 SHUTDOWN INTV 0 0 4.70 0 5 10 15 20 25 30 35 0 10 20 30 40 50 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) CURRENT (mA) TEMPERATURE (°C) 3729 G04 3729 G05 3729 G06
Maximum Current Sense Threshold Maximum Current Sense Threshold vs Percent of Nominal Output Internal 5V LDO Line Reg vs Duty Factor Voltage (Foldback)
5.1 75 80 ILOAD = 1mA 5.0 70 60 4.9 50 50 4.8 (mV) (mV) 40 VOLTAGE (V) 4.7 CC V SENSE V SENSE 30 25 INTV 4.6 20 4.5 10 4.4 0 0 0 5 10 15 20 25 30 35 0 20 40 60 80 100 0 25 50 75 100 INPUT VOLTAGE (V) DUTY FACTOR (%) PERCENT ON NOMINAL OUTPUT VOLTAGE (%) 3729 G07 3729 G08 3729 G09 3729fb 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions functional Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts