Datasheet LT3681 (Analog Devices) - 6

LT3681
W U TYPICAL PERFOR A CE CHARACTERISTICS TA = 25°C unless otherwise noted. Error Amp Output Current Minimum Input Voltage Minimum Input Voltage
100 4.5 6.5 80 4.0 6.0 60 µA) 40 3.5 5.5 20 0 3.0 5.0 PIN CURRENT ( –20 C INPUT VOLTAGE (V) INPUT VOLTAGE (V) V –40 2.5 VOUT = 3.3V 4.5 VOUT = 5.0V –60 L = 4.7m L = 4.7m f = 800kHz f = 800kHz –80 2.0 4.0 1.065 1.165 1 .265 1.365 1.465 0.001 0.01 0.1 1 10 0.001 0.01 0.1 1 10 FB PIN VOLTAGE (V) LOAD CURRENT (A) LOAD CURRENT (A) 3681 G19 3681 G20 3681 G20
Switching Waveforms; VC Voltages Power Good Threshold Burst Mode
2.50 1.200 VIN = 12V; FRONT PAGE APPLICATION ILOAD = 10mA I 2.00 L 1.180 0.5A/DIV CURRENT LIMIT CLAMP 1.50 1.160 VSW 5V/DIV 1.00 1.140 SWITCHING THRESHOLD THRESHOLD VOLTAGE (V) THRESHOLD VOLTAGE (V) V 0.50 OUT 1.120 10mV/DIV PG RISING 0 1.100 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 2 3681 G24 µs/DIV TEMPERATURE (°C) TEMPERATURE (°C) 3681 G22 3681 G23
Switching Waveforms; Transition from Burst Mode to Full Switching Waveforms; Full Power Schottky Diode Forward Frequency Frequency Continuous Operation Voltage vs Current
6000 IL I 0.5A/DIV L 5000 0.5A/DIV 4000 V V RUN/SS RUN/SS 5V/DIV 5V/DIV 3000 CURRENT (mA) 2000 VOUT VOUT 10mV/DIV 10mV/DIV 1000 VIN = 12V; FRONT PAGE APPLICATION VIN = 12V; FRONT PAGE APPLICATION ILOAD = 140mA ILOAD = 1A 0 3681 G25 1µs/DIV 3681 G26 1µs/DIV 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 FORWARD VOLTAGE (V) 3681 G29 3681f 6