Datasheet LT3980 (Analog Devices) - 6

LT3980
Typical perFormance characTerisTics TA = 25°C, unless otherwise noted. Minimum Input Voltage, Boost Diode Error Amp Output Current VOUT = 3.3V
1.4 50 6 f = 400kHz 40 1.2 30 TO START 1.0 5 20 (V) F 10 0.8 0 4 0.6 TO RUN –10 PIN CURRENT (µA) BOOST DIODE V 0.4 V C –20 INPUT VOLTAGE (V) 3 –30 0.2 –40 0 –50 2 0 0.5 1.0 1.5 2.0 –200 –100 0 100 200 1 10 100 1000 2000 BOOST DIODE CURRENT (A) FB PIN ERROR VOLTAGE (mV) I 3980 G19 LOAD (mA) 3980 G20 3980 G21
Minimum Input Voltage, VOUT = 5V VC Voltages Power Good Threshold
8 2.50 95 f = 400kHz CURRENT LIMIT CLAMP TO START 2.00 7 90 1.50 6 85 VOLTAGE (V) TO RUN 1.00 V C SWITCHING THRESHOLD INPUT VOLTAGE (V) 5 80 0.50 THRESHOLD VOLTAGE (%) 4 0 75 1 10 100 1000 2000 –50 –25 0 25 50 75 100 125 150 –50 –25 0 25 50 75 100 125 150 I TEMPERATURE (°C) TEMPERATURE (°C) LOAD (mA) 3980 G23 3980 G24 3980 G22
Switching Waveforms: Switching Waveforms: Transition from Burst Mode Switching Waveforms: Full Burst Mode Operation Operation to Full Frequency Frequency Continuous Operation
VSW V V 5V/DIV SW SW 5V/DIV 5V/DIV I I I L L L 0.2A/DIV 0.5A/DIV 0.2A/DIV VOUT VOUT VOUT 10mV/DIV 10mV/DIV 10mV/DIV VIN = 12V 5µs/DIV 3980 G25 3980 G26 VIN = 12V 1µs/DIV 3980 G27 VIN = 12V 1µs/DIV VOUT = 3.3V VOUT = 3.3V VOUT = 3.3V ILOAD = 10mA ILOAD = 110mA ILOAD = 1A 3980fa 6 For more information www.linear.com/LT3980 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 Typical Applications Package Description Revision History Typical Application Related Parts