Datasheet LT8608, LT8608B (Analog Devices) - 3

LT8608/LT8608B
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS
Feedback Reference Voltage MSOP Package VIN = 6V, ILOAD = 100mA 0.774 0.778 0.782 V VIN = 6V, ILOAD = 100mA l 0.762 0.778 0.798 V DFN Package VIN = 6V, ILOAD = 100mA 0.773 0.778 0.783 V VIN = 6V, ILOAD = 100mA l 0.753 0.778 0.803 V Feedback Voltage Line Regulation VIN = 4.0V to 40V l ±0.02 ±0.06 %/V Feedback Pin Input Current VFB = 1V l ±20 nA Minimum On-Time ILOAD = 1A, SYNC = 0V or LT8608 DFN l 35 65 ns ILOAD = 1A, SYNC = 1.9V or LT8608B DFN l 35 60 ns Minimum Off Time 93 130 ns Oscillator Frequency MSOP Package RT = 221k, ILOAD = 500mA l 155 200 245 kHz RT = 60.4k, ILOAD = 500mA l 640 700 760 kHz RT = 18.2k, ILOAD = 200mA l 1.90 2.00 2.10 MHz DFN Package RT = 221k, ILOAD = 500mA l 130 200 270 kHz RT = 60.4k, ILOAD = 500mA l 610 700 790 kHz RT = 18.2k, ILOAD = 200mA l 1.85 2.00 2.15 MHz Top Power NMOS On-Resistance ILOAD = 0.5A 350 mΩ Top Power NMOS Current Limit l 2.1 2.9 3.9 A Bottom Power NMOS On-Resistance 230 mΩ SW Leakage Current VIN = 36V l 15 µA EN/UV Pin Threshold EN/UV Rising l 0.99 1.05 1.11 V EN/UV Pin Hysteresis 50 mV EN/UV Pin Current VEN/UV = 2V l ±20 nA PG Upper Threshold Offset from VFB VFB Rising l 5.0 8.5 13.0 % PG Lower Threshold Offset from VFB VFB Falling l 5.0 8.5 13.0 % PG Hysteresis 0.5 % PG Leakage VPG = 42V l ±200 nA PG Pull-Down Resistance VPG = 0.1V 550 1200 Ω Sync Low Input Voltage MSOP Only l 0.4 0.9 V Sync High Input Voltage INTVCC = 3.5V, MSOP Only l 2.7 3.2 V TR/SS Source Current MSOP Only l 1 2 3 µA TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V, MSOP Only 300 900 Ω Spread Spectrum Modulation VSYNC = 3.3V, MSOP Only l 0.5 3 6 kHz Frequency
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings temperature range. The LT8608H is guaranteed over the full –40°C to may cause permanent damage to the device. Exposure to any Absolute 150°C operating junction temperature range. High junction temperatures Maximum Rating condition for extended periods may affect device degrade operating lifetimes. Operating lifetime is derated at junction reliability and lifetime. Absolute Maximum Ratings are those values beyond temperatures greater than 125°C. which the life of a device may be impaired.
Note 3:
This IC includes overtemperature protection that is intended to
Note 2:
The LT8608E is guaranteed to meet performance specifications protect the device during overload conditions. Junction temperature will from 0°C to 125°C junction temperature. Specifications over the –40°C exceed 150°C when overtemperature protection is active. Continuous to 125°C operating junction temperature range are assured by design, operation above the specified maximum operating junction temperature characterization, and correlation with statistical process controls. The will reduce lifetime. LT8608I is guaranteed over the full –40°C to 125°C operating junction Rev C For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts