Datasheet LT3504 (Analog Devices) - 3

LT3504
elecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V unless otherwise noted. SYMBOL CONDITIONS MIN TYP MAX UNITS
RUN/SS Pin Source Current VRUN/SS = 0V 1.3 µA RUN/SS Pin Threshold for Switching VFB = 0V 50 100 mV Feedback Voltage 790 800 810 mV l 784 800 816 mV FB Pin Current VFB = Measured VFB (Note 5) l 15 150 nA Reference Line Regulation VIN = 5V to 40V –0.015 %/V SKY Pin Current ISW = 1A 27 40 mA SKY Voltage above VIN Voltage VSKY – VIN 4.85 V Switching Frequency RT = 6.34k l 1.8 2.1 2.4 MHz RT = 18.2k l 0.85 1 1.15 MHz RT = 100k l 200 250 300 kHz Switching Phase RT = 18.2k 150 180 210 Deg SYNC Threshold Voltage 1.25 V SYNC Input Frequency 0.35 2.2 MHz Switch Current Limit (SW1,2,3,4) (Note 6) 1.45 1.75 2.1 A Switch VCESAT (SW1,2,3,4) ISW = 1A 400 mV Switch Leakage Current (SW1,2,3,4) 0.1 2 µA Catch Diode Current Limit (SW1,2,3,4) FB = 0V 0.75 1.15 1.33 A FB = 0.7V 1.0 1.45 1.67 A Switch Current Limit (SW5) (Note 6) 220 320 mA Switch VCESAT (SW5) ISW = 200mA 230 mV Switch Leakage Current (SW5) 0.1 2 µA Boost Diode Current Limit (SW5) VIN = 5V 350 450 mA PG Threshold Offset VFB Rising 65 90 125 mV PG Hysteresis VFB Rising – VFB Falling 35 mV PG Voltage Output Low IPG = 250µA 180 300 mV PG Pin Leakage VPG = 2V 0.01 1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Current flows into pin. may cause permanent damage to the device. Exposure to any Absolute
Note 4:
Quiescent current (VIN) is measured at VEN/UVLO = 1V Maximum Rating condition for extended periods may affect device
Note 5:
Current flows out of pin. reliability and lifetime.
Note 6:
Current limit is guaranteed by design and/or correlation to static
Note 2:
The LT3504EUF is guaranteed to meet performance specifications test. Slope compensation reduces current limit at higher duty cycles. from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design,
Note 7:
This IC includes overtemperature protection that is intended characterization and correlation with statistical process controls. The to protect the device during momentary overload conditions. Junction LT3504IUF is guaranteed over the full –40°C to 125°C operating junction temperature will exceed 125°C when overtemperature protection is active. temperature range. Continuous operation above the specified maximum operating junction temperature may impair device reliability. 3504fa For more information www.linear.com/LT3504 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 Package Description Revision History Typical Application Related Parts