Datasheet LT1676 (Analog Devices) - 4

LT1676
W U TYPICAL PERFORMANCE CHARACTERISTICS SHDN Pin Shutdown Threshold SHDN Pin Input Current SHDN Pin Lockout Thresholds vs Temperature vs Voltage vs Temperature
900 5 1.30 800 µA) 0 1.28 700 UPPER THRESHOLD –5 1.26 600 LOWER THRESHOLD 500 –10 1.24 400 SHDN PIN VOLTAGE (mV) SHDN PIN VOLTAGE (V) –15 25°C 1.22 SHDN PIN INPUT CURRENT ( 300 –55°C 125°C 200 –20 1.20 –50 –25 0 25 50 75 100 125 0 1 2 3 4 5 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) SHDN PIN VOLTAGE (V) TEMPERATURE (°C) LT1676 G04 1676 G05 LT1676 G06
Switching Frequency Minimum Synchronization Voltage Switch Minimum On-Time vs Temperature vs Temperature vs Temperature
106 2.25 600 VIN = 48V R 104 2.00 500 L = 50Ω FB = 102 1.75 400 100 1.50 300 98 1.25 200 SWITCHING FREQUENCY (kHz) 96 1.00 SWITCH MINIMUM ON-TIME (ns) 100 MINIMUM SYNCHRONIZATION VOLTAGE (V) 94 0.75 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 1676 G07 1676 G08 1676 G09
VC Pin Switching Threshold, Boost Threshold, Clamp Voltage Feedback Amplifier Output Error Amplifier Transconductance vs Temperature Current vs FB Pin Voltage vs Temperature
2.2 750 µA) 100 25°C 2.0 –55°C 700 CLAMP 50 125°C 1.8 VOLTAGE µmho) 650 0 1.6 600 BOOST 1.4 THRESHOLD 550 –50 PIN VOLTAGE (V) CV 1.2 SWITCHING 500 THRESHOLD –100 TRANSCONDUCTANCE ( 1.0 450 0.8 FEEDBACK AMPLIFIER OUTPUT CURRENT ( –150 400 –50 –25 0 25 50 75 100 125 1.0 1.1 1.2 1.3 1.4 1.5 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) FB PIN VOLTAGE (V) TEMPERATURE (°C) LT1676 G10 1676 G11 LT1676 G12 4