Datasheet LT3971, LT3971-3.3, LT3971-5 (Analog Devices) - 3

LT3971/LT3971-3.3/LT3971-5
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3971EDD-5#PBF LT3971EDD-5#TRPBF LFRP 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT3971IDD-5#PBF LT3971IDD-5#TRPBF LFRP 10-Lead (3mm × 3mm) Plastic DFN –40°C to 125°C LT3971EMSE-5#PBF LT3971EMSE-5#TRPBF LTFRQ 10-Lead Plastic MSOP –40°C to 125°C LT3971IMSE-5#PBF LT3971IMSE-5#TRPBF LTFRQ 10-Lead Plastic MSOP –40°C to 125°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, VEN = 12V, VBD = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage (Note 4) l 4 4.3 V Quiescent Current from VIN VEN Low 0.7 1.2 μA VEN High, VSYNC Low 1.7 2.7 μA VEN High, VSYNC Low l 4.5 μA LT3971 FB Pin Current VFB = 1.19V l 0.1 12 nA Internal Feedback Resistor Divider (LT3971-X) 10 MΩ Feedback Voltage 1.175 1.19 1.205 V l 1.165 1.19 1.215 V LT3971-3.3 Output Voltage 3.25 3.3 3.35 V l 3.224 3.3 3.376 V LT3971-5 Output Voltage 4.93 5 5.07 V l 4.89 5 5.11 V FB Voltage Line Regulation 4.3V < VIN < 38V (Note 4) 0.0002 0.01 %/V Switching Frequency RT = 11k 1.6 2 2.4 MHz RT = 35.7k 0.8 1 1.2 MHz RT = 255k 160 200 240 kHz Minimum Switch On Time 80 ns Minimum Switch Off Time 110 150 ns Switch Current Limit 1.8 2.4 3 A Switch VCESAT ISW = 1A 330 mV Switch Leakage Current 0.02 1 μA Boost Schottky Forward Voltage ISH = 100mA 770 mV Boost Schottky Reverse Leakage VREVERSE = 12V 0.02 1 μA Minimum Boost Voltage (Note 3) VIN = 5V l 1.4 1.8 V BOOST Pin Current ISW = 1A, VBOOST = 15V 20 28 mA EN Voltage Threshold EN Rising l 0.95 1.01 1.07 V EN Voltage Hysteresis 30 mV EN Pin Current 0.2 20 nA LT3971 PG Threshold Offset from VFB VFB Rising 60 100 140 mV LT3971 PG Hysteresis 20 mV LT3971-X PG Threshold Offset from VOUT VOUT Rising 5.5 9 12.5 % LT3971-X PG Hysteresis 1.3 % 3971fd 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 Related Parts