Datasheet LT8608, LT8608B (Analog Devices) - 7

LT8608/LT8608B
TYPICAL PERFORMANCE CHARACTERISTICS Minimum Load to Full Frequency (SYNC Float to 1.9V) Soft-Start Tracking (MSOP Package) Frequency Foldback (MSOP Package) Soft-Start Tracking
125 2500 1.0 L = 2.2µH V 0.9 OUT = 5V 2250 100 RT = 18.2k 2000 0.8 1750 0.7 75 1500 0.6 1250 TAGE (V) 0.5 50 1000 0.4 FB VOL LOAD CURRENT (mA) FREQUENCY (kHz) 750 0.3 25 500 0.2 250 SYNC = 0V OR LT8608 DFN 0.1 R 0 T = 18.2k 0 0 0 5 10 15 20 25 30 35 40 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 0.1 0.2 0.4 0.5 0.6 0.7 0.8 1.0 1.1 1.2 INPUT VOLTAGE (V) FB VOLTAGE (V) SS VOLTAGE (V) 8608 G19 8608 G21 8608 G20
Steady State Case Temperature Soft-Start Current vs Temperature V Soft Start Current Vs Temperature VIN UVLO Rise vs Load Current (5V (MSOP Package) (5V out) OUT) IN UVLO
2.5 3.25 50 VIN = 6V 2.4 45 VIN = 12V 2.3 3.00 V 40 IN = 36V 2.2 35 2.1 2.75 30 2.0 25 T CURRENT (µA) UVLO (V) AR 1.9 2.50 V IN 20 T-ST 1.8 15 CASE TEMP RISE (°C) SOF 1.7 2.25 10 1.6 5 L = 2.2µH fSW = 2MHz 1.5 2.00 0 –50 –30 –10 10 30 50 70 90 110 130 150 –50 –30 –10 10 30 50 70 90 110 130 150 0.00 0.25 0.50 0.75 1.00 1.25 1.50 TEMPERATURE (°C) TEMPERATURE (°C) IOUT (A) 8608 G22 8608 G23 8608 G24
Steady State Case Temperature Rise vs Load (3.3VOUT) Start-Up Dropout Start–Up Droupout Start-Up Dropout Start-Up Droupout
50 7 7 7 7 V RLOAD = 50Ω RLOAD = 5Ω IN = 12V 45 VIN = 36V 6 6 6 6 40 OUTPUT VOL OUTPUT VOL 35 5 5 5 5 30 4 4 TAGE (V) 4 V TAGE (V) IN 4 25 VIN V T T 3 OUT 3 AGE (V) V 3 OUT 3 AGE (V) 20 15 CASE TEMP RISE (°C) INPUT VOL 2 2 INPUT VOL 2 2 10 1 1 1 1 L = 2.2µH 5 fSW = 2MHz 0 0 0 0 0 0.00 0.25 0.50 0.75 1.00 1.25 1.50 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 IOUT (A) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 8608 G25 8608 G26 8608 027 Rev. E For more information www.analog.com 7 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts