Datasheet LT8609, LT8609A, LT8609B (Analog Devices) - 9

LT8609/LT8609A/LT8609B
TYPICAL PERFORMANCE CHARACTERISTICS Minimum Load to Full Frequency Burst Frequency vs Load Current (SYNC Float to 1.9V) Frequency Foldback
2500 100 2500 L = 2.2µH VOUT = 5V V V IN = 12V OUT = 3.3V 90 fSW = 700kHz VOUT = 3.3V 2000 VIN = 12V SYNC = FLOAT R SYNC = 0V 80 2000 T = 18.2k 70 1500 60 1500 50 1000 40 1000 FREQUENCY (kHz) FREQUENCY (kHz) LOAD CURRENT (mA) 30 500 20 500 10 0 0 0 0 200 400 600 0 10 20 30 40 50 0 0.2 0.4 0.6 0.8 1 LOAD CURRENT (mA) INPUT VOLTAGE (V) FB VOLTAGE (V) 8609 G22 8609 G23 8609 G24
Soft-Start Tracking Soft-Start T Soft-Start Current vs Temperature Soft Start Current Vs T VIN UVLO
1.0 2.5 3.5 V 0.9 2.4 SS = 0.1V 3 0.8 2.3 2.5 0.7 2.2 0.6 2.1 2 TAGE (V) 0.5 2.0 T CURRENT (µA) UVLO (V) 1.5 0.4 AR 1.9 V IN FB VOL 0.3 T ST 1.8 1 0.2 SOF 1.7 0.5 0.1 1.6 0 1.5 0 0 0.1 0.2 0.4 0.5 0.6 0.7 0.8 1.0 1.1 1.2 –50 –30 –10 10 30 50 70 90 110 130 150 –55 –25 5 35 65 95 125 155 SS VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) 8609 G25 8609 G26 8609 G30
Case Temperature vs Case Temperature vs Load Current 3A Pulsed Load Case Temperature vs 3A Pulsed Load
60 50 VOUT = 5V VIN = 12V f 45 SW = 2MHz VIN = 24V 50 STANDBY LOAD = 50mA 40 PULSED LOAD = 3A 35 40 VOUT = 5V fSW = 2MHz 30 TURE RISE (°C) 30 TURE RISE (°C) 25 20 20 15 CASE TEMPERA 10 10 CASE TEMPERA VIN = 12V 5 VIN = 24V 0 0 0 0.5 1 1.5 2 2.5 3 0 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (A) DUTY CYCLE (%) 8609 G31 8609 G32 Rev. I For more information www.analog.com 9 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts