Datasheet LTC3779 (Analog Devices) - 9

LTC3779
TYPICAL PERFORMANCE CHARACTERISTICS VINOV Transient Forced Peak Current Threshold vs VITH Continuous Mode Buck Region Current Foldback Limit (Boost)
200 200 SW1 BOOST 100V/DIV 150 150 SW2 100 100 100A/DIV IL 50 50 10A/DIV 0 0 VOUT 50V/DIV –50 –50 10ms/DIV 3779 G27 V –100 –100 IN = 120V V BUCK OUT = 48V CURRENT LIMIT (SENSEP – SENSEN) (mV) CURRENT LIMIT (SENSEP – SENSEN) (mV) 50Ω RESISTIVE LOAD –150 –150 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 VFB (V) VITH (V) 3779 G28 3779 G29
Valley Current Threshold vs VITH Maximum Current Limit Regulated Feedback Voltage (Buck) vs Temperature vs Temperature
100 200 1220 150 50 BOOST 1210 100 50 TAGE (mV) 0 1200 0 –50 –50 BUCK FEEDBACK VOL 1190 –100 CURRENT LIMIT (SENSEP – SENSEN) (mV) CURRENT LIMIT (SENSEP – SENSEN) (mV) –100 –150 1180 0 0.2 0.4 0.6 0.8 1.1 1.3 1.5 1.7 1.9 2.1 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 VITH (V) TEMPERATURE (°C) TEMPERATURE (°C) 3779 G30 3779 G31 3779 G32
Undervoltage Lockout Threshold V5 Low Dropout Regulation (V5) vs Temperature Voltage vs Temperature EXTVCC LDO vs Temperature
4.4 5.7 12 EXTVCC = 30V 4.3 11 RISING 4.2 5.6 DRVSET = V5 10 4.1 DRVSET = 3/4 • V5 TAGE (V) 9 4.0 5.5 DRVSET = 1/2 • V5 VCC (V) 8 3.9 DR DRVSET = 1/4 • V5 UVLO THRESHOLD (V) V5 LDO VOL 7 3.8 5.4 DRVSET = GND FALLING 3.7 6 3.6 5.3 5 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3779 G33 3779 G34 3779 G35 Rev A For more information www.analog.com 9 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 REVISION HISTORY TYPICAL APPLICATION RELATED PARTS