Datasheet LT8705A (Analog Devices) - 3

LT8705A
orDer inForMaTion http://www.linear.com/product/LT8705A#orderinfo LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT8705AEUHF#PBF LT8705AEUHF#TRPBF 8705A 38-Lead (5mm × 7mm) Plastic QFN –40°C to 125°C LT8705AIUHF#PBF LT8705AIUHF#TRPBF 8705A 38-Lead (5mm × 7mm) Plastic QFN –40°C to 125°C LT8705AEFE#PBF LT8705AEFE#TRPBF LT8705AFE 38-Lead Plastic TSSOP –40°C to 125°C LT8705AIFE#PBF LT8705AIFE#TRPBF LT8705AFE 38-Lead Plastic TSSOP –40°C to 125°C LT8705AHFE#PBF LT8705AHFE#TRPBF LT8705AFE 38-Lead Plastic TSSOP –40°C to 150°C LT8705AMPFE#PBF LT8705AMPFE#TRPBF LT8705AFE 38-Lead Plastic TSSOP –55°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. 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.
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, SHDN = 3V unless otherwise noted. (Note 3) PARAMETER CONDITIONS MIN TYP MAX UNITS Voltage Supplies and Regulators
VIN Operating Voltage Range EXTVCC = 0V l 5.5 80 V EXTVCC = 7.5V l 2.8 80 V VIN Quiescent Current Not Switching, VEXTVCC = 0 2.65 4.2 mA VIN Quiescent Current in Shutdown VSHDN = 0V 0 1 µA EXTVCC Switchover Voltage IINTVCC = 20mA, VEXTVCC Rising l 6.15 6.4 6.6 V EXTVCC Switchover Hysteresis 0.18 V INTVCC Current Limit Maximum Current Draw from INTVCC and LDO33 Pins Combined. Regulated from VIN or EXTVCC (12V) INTVCC = 5.25V l 90 127 165 mA INTVCC = 4.5V l 28 42 55 mA INTVCC Voltage Regulated from VIN, IINTVCC = 20mA l 6.15 6.35 6.55 V Regulated from EXTVCC (12V), IINTVCC = 20mA l 6.15 6.35 6.55 V INTVCC Load Regulation IINTVCC = 0mA to 50mA –0.5 –1.5 % INTVCC, GATEVCC Undervoltage Lockout INTVCC Falling, GATEVCC Connected to INTVCC l 4.45 4.65 4.85 V INTVCC, GATEVCC Undervoltage Lockout Hysteresis GATEVCC Connected to INTVCC 160 mV INTVCC Regulator Dropout Voltage VIN-VINTVCC, IINTVCC = 20mA 245 mV LDO33 Pin Voltage 5mA from LDO33 Pin l 3.23 3.295 3.35 V LDO33 Pin Load Regulation ILDO33 = 0.1mA to 5mA –0.25 –1 % LDO33 Pin Current Limit l 12 17.25 22 mA LDO33 Pin Undervoltage Lockout LDO33 Falling 2.96 3.04 3.12 V LDO33 Pin Undervoltage Lockout Hysteresis 35 mV
Switching Regulator Control
Maximum Current Sense Threshold (VCSP – VCSN) Boost Mode, Minimum M3 Switch Duty Cycle (LT8705AE, LT8705AI) l 102 117 132 mV (LT8705AH, LT8705AMP) l 100 117 134 mV Maximum Current Sense Threshold (VCSN – VCSP) Buck Mode, Minimum M2 Switch Duty Cycle (LT8705AE, LT8705AI) l 69 86 102 mV (LT8705AH, LT8705AMP) l 67 86 104 mV 8705af For more information www.linear.com/LT8705A 3 Document Outline Features Description Applications 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 Typical Application Related Parts