Datasheet LT8471 (Analog Devices) - 3

LT8471
orDer inForMaTion LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8471EFE#PBF LT8471EFE#TRPBF LT8471FE 20-Lead Plastic TSSOP –40°C to 125°C LT8471IFE#PBF LT8471IFE#TRPBF LT8471FE 20-Lead Plastic TSSOP –40°C to 125°C LT8471HFE#PBF LT8471HFE#TRPBF LT8471FE 20-Lead Plastic TSSOP –40°C to 150°C LT8471EUFD#PBF LT8471EUFD#TRPBF 8471 28-LEAD (4mm × 5mm) Plastic QFN –40°C to 125°C LT8471IUFD#PBF LT8471IUFD#TRPBF 8471 28-LEAD (4mm × 5mm) Plastic QFN –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 nonstandard 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/
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1 = VIN2 = 5V, unless otherwise noted (Note 2). PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage (VIN1, VIN2) l 2.6 50 V Quiescent Current (VIN1, Skyhook Disabled) VOV/UV = 1.3V, Not Switching 2.2 3.3 mA Quiescent Current (VIN1, Skyhook Enabled) VOV/UV = 1.3V, C3 = 5V, Not Switching 2.4 4 mA Quiescent Current (VIN2) VOV/UV = 1.3V, Not Switching 29 42 µA Quiescent Current in Shutdown (VIN1 + VIN2) VOV/UV = 0V 0.01 1 μA Positive Feedback Voltage (FB1, FB2) l 773 789 805 mV Negative Feedback Voltage (LT8471E,I) l –806 –788 –770 mV (FB1, FB2) (LT8471H) l –806 –788 –767 mV Feedback Pin Bias Current (FB1, FB2) VFB = Positive Feedback Voltage, Current Out of Pin 30 200 nA VFB = Negative Feedback Voltage –100 0 100 nA Error Amp Transconductances Primary Channels, ∆I = 2μA 70 μmhos Error Amp Voltage Gains Primary Channels 95 V/V Reference Line Regulation 2.6V ≤ VIN1 ≤ 50V 0.008 0.05 %/V Switching Frequency, fOSC RT = 46.4k l 1.55 1.8 2.05 MHz RT = 732k l 100 117 135 kHz Switching Frequency in Foldback All Channels. Compared to Normal fOSC 1/8 Ratio Switching Frequency Range Synchronizing l 100 2000 kHz SYNC High Level for Sync l 1.3 V SYNC Low Level for Sync l 0.4 V SYNC Clock Pulse Duty Cycle VSYNC = 0V to 2V 35 65 % Recommended Minimum SYNC Ratio fSYNC/fOSC ¾ Ratio Switching Phase Between Primary Channels RT = 46.4k 170 200 Deg RT = 732k 170 200 Deg Skyhook Boost Voltage VSHOUT – VC2, Skyhook Enabled 3.0 4.25 5.4 V Minimum Switch Off-Time Primary Channels (Note 7) 170 ns Skyhook Channel (Note 7) 100 ns Minimum Switch On-Time Primary Channels(Note 7) 220 ns Skyhook Channel (Note 7) 30 ns 8471fd For more information www.linear.com/8471 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 Related Parts