Datasheet LT3971, LT3971-3.3, LT3971-5 (Analog Devices) - 7

LT3971/LT3971-3.3/LT3971-5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Transient Load Response, Load Current Stepped from 25mA Boost Diode Forward Voltage Power Good Threshold (Burst Mode Operation) to 525mA
1.6 95 1.4 94 93 1.2 VOUT 92 100mV/DIV 1.0 TAGE (%) 91 0.8 90 0.6 89 BOOST DIODE VF (V) 88 0.4 THRESHOLD VOL 87 0.2 IL 86 500mA/DIV 0 85 0 250 500 750 1000 1250 1500 –55 –25 5 35 65 95 125 155 10µs/DIV 3971 G24 BOOST DIODE CURRENT (mA) TEMPERATURE (°C) VIN = 12V, VOUT = 3.3V 3971 G22 3971 G23 COUT = 47µF
Transient Load Response, Load Current Stepped from Switching Waveforms; Switching Waveforms; Full 0.5A to 1A Burst Mode Operation Frequency Continuous Operation
VOUT V 100mV/ V SW SW 5V/DIV DIV 5V/DIV IL I 500mA/DIV L 500mA/DIV IL 500mA/ DIV VOUT VOUT 20mV/DIV 20mV/DIV 10µs/DIV 3971 G25 5µs/DIV 3971 G26 1µs/DIV 3971 G27 VIN = 12V, VOUT = 3.3V VIN = 12V, VOUT = 3.3V VIN = 12V, VOUT = 3.3V COUT = 47µF ILOAD = 10mA ILOAD = 1A COUT = 22µF COUT = 22µF
3.3V Start-Up and Dropout 3.3V Start-Up and Dropout 5V Start-Up and Dropout
VIN VIN VIN /DIV /DIV /DIV 1V 1V 1V VOUT VOUT VOUT 0.5s/DIV 3971 G31 0.5s/DIV 3971 G32 0.5s/DIV 3971 G33 800kHz 800kHz 800kHz 3kΩ LOAD 6.7Ω LOAD 5kΩ LOAD 3971fd 7 Document Outline Features Applications Description 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 Related Parts