Datasheet LT3959 (Analog Devices) - 3

LT3959
orDer inForMaTion LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3959EUHE#PBF LT3959EUHE#TRPBF 3959 36-Lead (5mm × 6mm) Plastic QFN –40°C to 125°C LT3959IUHE#PBF LT3959IUHE#TRPBF 3959 36-Lead (5mm × 6mm) Plastic QFN –40°C to 125°C LT3959EFE#PBF LT3959EFE#TRPBF LT3959FE 38-Lead Plastic TSSOP –40°C to 125°C LT3959IFE#PBF LT3959IFE#TRPBF LT3959FE 38-Lead Plastic TSSOP –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, VIN = 12V, EN/UVLO = 12V, INTVCC = 4.75V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Operating Voltage l 1.6 40 V VIN Start-Up Voltage RT = 27.4kΩ, FBX = 0 l 2.5 2.65 V VIN Shutdown IQ EN/UVLO < 0.4V 0.1 1 µA EN/UVLO = 1.15V 6 µA VIN Operating IQ 350 450 µA DRIVE Shutdown Quiescent Current EN/UVLO < 0.4V 0.1 1 µA EN/UVLO = 1.15V 0.1 2 µA DRIVE Quiescent Current (Not Switching) RT = 27.4kΩ, DRIVE = 6V 2.0 2.5 mA SW Pin Current Limit l 6.0 7.0 8.0 A SW Pin On Voltage ISW = 3A 100 mV SW Pin Leakage Current SW = 40V 5 µA
Error Amplifier
FBX Regulation Voltage (VFBX(REG)) FBX > 0V l 1.580 1.6 1.620 V FBX < 0V l –0.815 –0.80 –0.785 V FBX Pin Input Current FBX = 1.6V 80 130 nA FBX = –0.8V –10 10 nA Transconductance gm (∆IVC/∆VFBX) FBX = VFBX(REG) 240 µs VC Output Impedance 5 MΩ FBX Line Regulation [∆VFBX(REG)/(∆VIN • VFBX(REG))] 1.6V < VIN < 40V, FBX >0 0.02 0.05 %/V 1.6V < VIN < 40V, FBX <0 0.02 0.05 %/V VC Source Current FBX = 0V, VC = 1.3V –13 µA VC Sink Current FBX = 1.7V, VC = 1.3V 13 µA FBX = –0.85V, VC = 1.3V 10 µA
Oscillator
Switching Frequency RT = 27.4k to SGND, VFBX = 1.6V l 250 300 340 kHz RT = 86.6k to SGND, VFBX = 1.6V 100 kHz RT = 6.81k to SGND, VFBX = 1.6V 1000 kHz RT Voltage FBX = 1.6V, –0.8V 1.13 V SW Minimum Off-Time 150 200 ns SW Minimum On-Time 150 200 ns 3959fa For more information www.linear.com/LT3959 3 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts