Datasheet LT3976 (Analog Devices) - 7

LT3976
Typical perForMance characTerisTics TA = 25°C, unless otherwise noted. Minimum Input Voltage, Minimum Input Voltage, PG Thresholds VOUT = 5V VOUT = 3.3V
1.12 6.5 5.0 VOUT = 5V VOUT = 3.3V 1.11 fSW = 800kHz FRONT PAGE APPLICATION 6.0 4.5 1.10 TO RUN/TO START TO RUN/TO START 1.09 FB RISING 5.5 4.0 1.08 1.07 FB FALLING 5.0 3.5 PG THRESHOLD (V) INPUT VOLTAGE (V) INPUT VOLTAGE (V) 1.06 4.5 3.0 1.05 1.04 4.0 2.5 –55 –25 5 35 65 95 125 155 0 1 2 3 4 5 0 1 2 3 4 5 TEMPERATURE (°C) LOAD CURRENT (A) LOAD CURRENT (A) 3976 G25 3976 G26 3976 G27
Burst Frequency SS Pin Current Boost Capacitor Charger
900 2.6 160 VSS = 0.5V VBST = VIN 800 2.4 140 VOUT = 5V 700 fSW = 800kHz 2.2 120 600 2.0 100 500 1.8 80 400 VOUT = 3.3V fSW = 600kHz 1.6 60 300 SS PIN CURRENT (µA) 1.4 OUT PIN CURRENT (mA) 40 SWITCHING FREQUENCY (kHz) 200 100 1.2 20 0 1.0 0 0 20 40 60 80 100 120 140 160 –55 –25 5 35 65 95 125 155 0 2 4 6 8 10 12 14 16 LOAD CURRENT (mA) TEMPERATURE (°C) OUT PIN VOLTAGE (V) 3976 G28 3976 G29 3976 G30
Boost Diode Forward Voltage Dropout Comparator Thresholds
1.6 600 580 1.4 560 1.2 540 1.0 VOUT RISING 520 0.8 500 0.6 480 VOUT FALLING 460 BOOST DIODE VOLTAGE (V) 0.4 DROPOUT THRESHOLD (mV) 440 0.2 420 0 400 0 0.5 1 1.5 2 –55 –25 5 35 65 95 125 155 BOOST DIODE CURRENT (A) TEMPERATURE (°C) 3976 G31 3976 G32 3976f For more information www.linear.com/3976 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 Typical Application Related Parts