Datasheet LTC3728L, LTC3728LX (Analog Devices) - 6

LTC3728L/LTC3728LX
Typical perForMance characTerisTics Efficiency vs Output Current Efficiency vs Output Current Efficiency vs Input Voltage and Mode (Figure 13) (Figure 13) (Figure 13)
100 100 100 Burst Mode 90 V OPERATION IN = 7V 80 90 90 70 VIN = 10V FORCED V 60 CONTINUOUS 80 IN = 15V 80 MODE (PWM) 50 VIN = 20V 40 70 70 EFFICIENCY (%) CONSTANT EFFICIENCY (%) EFFICIENCY (%) 30 FREQUENCY (BURST DISABLE) 20 60 60 VIN = 15V VOUT = 5V 10 V V OUT = 5V OUT = 5V IOUT = 3A f = 250kHz f = 250kHz f = 250kHz 0 50 50 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 5 15 25 35 OUTPUT CURRENT (A) OUTPUT CURRENT (A) INPUT VOLTAGE (V) 3728L G01 3728L G02 3728L G03
Supply Current vs Input Voltage INTVCC and EXTVCC Switch and Mode (Figure 13) EXTVCC Voltage Drop Voltage vs Temperature
1000 200 5.05 INTVCC VOLTAGE 5.00 800 150 4.95 600 4.90 BOTH CONTROLLERS ON TAGE DROP (mV) 100 SWITCH VOLTAGE (V) CC Y CURRENT (µA) 400 4.85 VOL SUPPL V CC 4.80 50 200 EXT AND EXTV EXTV CC CC SWITCHOVER THRESHOLD 4.75 SHUTDOWN INTV 0 0 4.70 0 5 10 15 20 25 30 0 10 20 30 40 –50 –25 0 25 50 75 100 125 INPUT VOLTAGE (V) CURRENT (mA) TEMPERATURE (°C) 3728L G04 3728L G05 3728L G06
Maximum Current Sense Maximum Current Sense Threshold vs Percent of Nominal Internal 5V LDO Line Regulation Threshold vs Duty Factor Output 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 INTV 25 4.6 20 4.5 10 4.4 0 0 0 5 10 15 20 25 30 0 20 40 60 80 100 0 25 50 75 100 INPUT VOLTAGE (V) DUTY FACTOR (%) PERCENT ON NOMINAL OUTPUT VOLTAGE (%) 3728L G07 3728L G08 3728L G09 3728lxff 6 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 Applications Package Description Revision History Typical Application Related Parts