Datasheet LT3973, LT3973-3.3, LT3973-5 (Analog Devices) - 3

LT3973/LT3973-3.3/LT3973-5
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3973EDD-5#PBF LT3973EDD-5#TRPBF LGGF 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT3973IDD-5#PBF LT3973IDD-5#TRPBF LGGF 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT3973HDD-5#PBF LT3973HDD-5#TRPBF LGGF 10-Lead (3mm × 3mm) Plastic DFN –40°C to 150°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VBD = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage (Note 3) l 3.8 4.2 V Quiescent Current from VIN VEN/UVLO Low 0.75 1.3 µA VEN/UVLO High 1.8 2.8 µA VEN/UVLO High, –40°C to 125°C l 6 µA VEN/UVLO High, –40°C to 150°C l 12 µA LT3973 Feedback Voltage 1.195 1.21 1.225 V l 1.185 1.21 1.235 V LT3973-3.3 Output Voltage 3.26 3.3 3.34 V l 3.234 3.3 3.366 V LT3973-5 Output Voltage 4.94 5 5.06 V l 4.9 5 5.1 V LT3973 FB Pin Bias Current VFB = 1.21V l 0.1 20 nA FB/Output Voltage Line Regulation 4.2V < VIN < 40V 0.0002 0.01 %/V Switching Frequency RT = 41.2k, VIN = 6V 1.72 2.15 2.58 MHz RT = 158k, VIN = 6V 632 790 948 kHz RT = 768k, VIN = 6V 156 195 234 kHz Switch Current Limit VIN = 5V, VFB = 0V l 1.237 1.65 1.98 A Catch Schottky Current Limit VIN = 5V l 0.92 1.15 1.44 A Switch VCESAT ISW = 500mA 250 mV Switch Leakage Current 0.05 2 µA Catch Schottky Forward Voltage ISCH = 200mA, VIN = VBD = NC 550 mV Catch Schottky Reverse Leakage VSW = 12V 0.05 2 µA Boost Schottky Forward Voltage ISCH = 50mA, VIN = NC, VBOOST = 0V 820 mV Boost Schottky Reverse Leakage VREVERSE = 12V 0.02 2 µA Minimum Boost Voltage (Note 4) VIN = 5V l 1.4 1.8 V BOOST Pin Current ISW = 500mA, VBOOST = 15V 10 13 mA Dropout Comparator Threshold (VIN - OUT) Falling, VIN = 5V l 400 490 580 mV Dropout Comparator Hysteresis 40 mV 3973fb For more information www.linear.com/LT3973 3 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 Typical Application Related Parts