Datasheet LTC3835 (Analog Devices) - 3

LTC3835
ORDER INFORMATION (Note 2) LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3835EFE#PBF LTC3835EFE#TRPBF LTC3835EFE 20-Lead Plastic TSSOP –40°C to 85°C LTC3835IFE#PBF LTC3835IFE#TRPBF LTC3835IFE 20-Lead Plastic TSSOP –40°C to 85°C LTC3835EUFD#PBF LTC3835EUFD#TRPBF 3835 20-Pin (4mm × 5mm) Plastic DFN –40°C to 85°C LTC3835IUFD#PBF LTC3835IUFD#TRPBF 3835 20-Pin (4mm × 5mm) Plastic DFN –40°C to 85°C
AUTOMOTIVE PRODUCTS**
LTC3835EUFD#WPBF LTC3835EUFD#WTRPBF 3835 20-Pin (4mm × 5mm) Plastic DFN –40°C to 85°C LTC3835IUFD#WPBF LTC3835IUFD#WTRPBF 3835 20-Pin (4mm × 5mm) Plastic DFN –40°C to 85°C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
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Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a #W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models.
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VRUN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Main Control Loops
VFB Regulated Feedback Voltage (Note 4); ITH Voltage = 1.2V l 0.792 0.800 0.808 V IVFB Feedback Current (Note 4) –5 –50 nA VREFLNREG Reference Voltage Line Regulation VIN = 4V to 30V (Note 4) 0.002 0.02 %/V VLOADREG Output Voltage Load Regulation (Note 4) Measured in Servo Loop; ∆ITH Voltage = 1.2V to 0.7V l 0.1 0.5 % Measured in Servo Loop; ∆ITH Voltage = 1.2V to 2V l –0.1 –0.5 % gm Transconductance Amplifier gm ITH = 1.2V; Sink/Source 5µA (Note 4) 1.55 mmho IQ Input DC Supply Current (Note 5) Sleep Mode RUN = 5V, VFB = 0.83V (No Load) 80 125 µA Shutdown VRUN = 0V 10 20 µA UVLO Undervoltage Lockout VIN Ramping Down l 3.5 4 V VOVL Feedback Overvoltage Lockout Measured at VFB Relative to Regulated VFB 8 10 12 % ISENSE Sense Pins Total Source Current VSENSE– = VSENSE+ = 0V –660 µA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRACK/SS Soft-Start Charge Current VTRACK = 0V 0.75 1.0 1.35 µA VRUN ON RUN Pin ON Threshold VRUN Rising 0.5 0.7 0.9 V VSENSE(MAX) Maximum Current Sense Threshold VFB = 0.7V, VSENSE– = 3.3V 90 100 110 mV VFB = 0.7V, VSENSE– = 3.3V l 80 100 115 mV TG Transition Time: (Note 6) TG tr Rise Time CLOAD = 3300pF 50 90 ns TG tf Fall Time CLOAD = 3300pF 50 90 ns BG Transition Time: (Note 6) BG tr Rise Time CLOAD = 3300pF 40 90 ns BG tf Fall Time CLOAD = 3300pF 40 80 ns Rev. F For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts