Datasheet LTC3789 (Analog Devices) - 5

LTC3789
Typical perForMance characTerisTics TA = 25°C unless otherwise noted. Efficiency vs Output Current Efficiency vs Output Current Efficiency vs Output Current (Boost Region) (Buck-Boost Region) (Buck Region)
100 100 100 VIN = 6V VIN = 12V VIN = 18V 90 VOUT = 12V 90 VOUT = 12V 90 VOUT = 12V 80 80 80 70 70 70 60 60 60 50 50 50 40 40 40 EFFICIENCY (%) EFFICIENCY (%) EFFICIENCY (%) 30 30 30 20 20 20 10 DCM 10 DCM 10 DCM CIRCUIT OF FIGURE 13 FCM CIRCUIT OF FIGURE 13 FCM CIRCUIT OF FIGURE 13 FCM 0 0 0 10 100 1000 10000 10 100 1000 10000 10 100 1000 10000 LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA) 3789 G01 3789 G02 3789 G03
Internal 5.5V LDO Line Efficiency vs VIN Regulation EXTVCC LDO Line Regulation
99 6.0 6 CIRCUIT OF FIGURE 13 98 5 5.5 97 4 96 5.0 (V) 95 3 VOLTAGE (V) V CC CC 4.5 INT EFFICIENCY (%) 94 FREQUENCY 2 93 INTV 200kHz 300kHz 4.0 92 400kHz 1 520kHz 91 3.5 0 0 10 20 30 40 4 9 14 19 24 29 34 4 5 6 7 8 9 10 11 12 13 14 VIN (V) INPUT VOLTAGE (V) EXTV 3789 G05 CC (V) 3789 G06 3789 G04
INTVCC and EXTVCC Switch RUN Pin Threshold Voltage vs Temperature Supply Current vs Input Voltage vs Temperature
6 4.0 1.5 3.5 1.4 5 RISING TAGE (V) 1.3 RISING FALLING 3.0 1.2 4 2.5 FALLING 1.1 SWITCH VOL 3 2.0 1.0 V CC 1.5 0.9 2 0.8 SUPPLY CURRENT (mA) 1.0 AND EXT 0.7 V CC 1 0.5 0.6 INT 0 UNDERVOLTAGE RESET VOLTAGE AT RUN (V) 0.5 0 4 9 14 19 24 29 34 –60 –40 –20 0 20 40 60 80 100 –60 –40 –20 0 20 40 60 80 100 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 3789 G08 3789 G07 3789 G09 3789fc For more information www.linear.com/LTC3789 5 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration order information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Typical Application Related Parts