Datasheet LT3971A, LT3971A-5 (Analog Devices) - 7

LT3971A/LT3971A-5
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Switching Waveforms; Switching Waveforms; Full Burst Mode Operation Frequency Continuous Operation 3.3V Start-Up and Dropout
800kHz 3kΩ LOAD V V V SW IN SW 5V/DIV 5V/DIV 1V/DIV IL IL 500mA/DIV 500mA/DIV VOUT VOUT VOUT 20mV/DIV 20mV/DIV 5μs/DIV 3971A G28 1μs/DIV 3971A G29 0.5s/DIV 3971A G30 VIN = 12V, VOUT = 3.3V VIN = 12V, VOUT = 3.3V ILOAD = 10mA ILOAD = 1A COUT = 22μF COUT = 22μF
3.3V Start-Up and Dropout 5V Start-Up and Dropout 5V Start-Up and Dropout
800kHz 800kHz 800kHz 6.7kΩ LOAD 5kΩ LOAD VIN 10Ω LOAD VIN VIN 1V/DIV 1V/DIV VOUT 1V/DIV VOUT VOUT 0.5s/DIV 3971A G31 0.5s/DIV 3971A G32 0.5s/DIV 3971A G33
Feedback Regulation Voltage Minimum Input Voltage to Switch
1.6 5 1.2 4 TAGE (V) TAGE (V) 0.8 3 INPUT VOL FEEDBACK VOL 0.4 2 0 1 2 2.5 3 3.5 4 4.5 5 –55 –25 5 35 65 95 125 155 INPUT VOLTAGE (V) TEMPERATURE (°C) 3971A G34 3971A G35 3971af 7 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 TYPICAL APPLICATION RELATED PARTS