Datasheet LTC3875 (Analog Devices) - 3

LTC3875
ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3875EUH#PBF LTC3875EUH#TRPBF 3875 40-Lead (5mm × 5mm) Plastic QFN –40°C to 125°C LTC3875IUH#PBF LTC3875IUH#TRPBF 3875 40-Lead (5mm × 5mm) Plastic QFN –40°C to 125°C LTC3875EUJ#PBF LTC3875EUJ#TRPBF LTC3875 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C LTC3875IUJ#PBF LTC3875IUJ#TRPBF LTC3875 40-Lead (6mm × 6mm) Plastic QFN –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. 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/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = 15V, VRUN1,2 = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VIN Input Voltage Range 4.5 38 V VOUT Output Voltage Range SNSD+ Pin to VOUT 0.6 3.5 V SNSD+ Pin to GND 0.6 5 V V + OSNS1,2 Regulated VOUT Feedback Voltage (Note 4); ITH1,2 Voltage = 1.2V, –40°C to 85°C 0.597 0.600 0.603 V Including Diffamp Error (Note 4); ITH1,2 Voltage = 1.2V,–40°C to 125°C l 0.5965 0.600 0.6045 V I + OSNS1,2 Feedback Current (Note 4) –30 –100 nA VREFLNREG Reference Voltage Line Regulation VIN = 4.5V to 38V (Note 4) 0.002 0.005 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V l 0.01 0.1 % Measured in Servo Loop; ∆ITH Voltage = 1.2V to 1.6V l –0.01 –0.1 % gm1,2 Transconductance Amplifier gm ITH1,2 = 1.2V; Sink/Source 5µA (Note 4) 2.2 mmho
Thermal Functions
ITCOMP1,2 Thermal Sensor Current 29 30 31 µA TSHDN Internal Thermal Shutdown (Note 8) 160 °C THYS Internal TS Hysteresis (Note 8) 10 °C
Fast Transient Functions
IFAST Fast Transient Program Current l 9 10 11 µA
Current Sensing Functions
I + SENSE(AC) AC Sense Pins Bias Current Each Channel; VSNSA (S) = 3.3V ±0.5 ±2 µA I + SENSE(DC) DC Sense Pins Bias Current Each Channel; VSNSD (S) = 3.3V l ±30 ±50 nA AVT(SNS) Total Sense Gain to Current Comp 5 V/V 3875fb For more information www.linear.com/LTC3875 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 Related Parts