Datasheet LT8609, LT8609A, LT8609B (Analog Devices) - 5

link to page 2 link to page 2 LT8609/LT8609A/LT8609B
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
Oscillator Frequency LT8609/LT8609A: RT = 221k, ILOAD = 0.5A l 155 200 245 kHz RT = 60.4k, ILOAD = 0.5A l 640 700 760 kHz RT = 18.2k, ILOAD = 0.5A l 1.925 2.00 2.075 MHz LT8609B: RT = 18.2k, ILOAD = 0.5A l 1.875 2.00 2.125 MHz Top Power NMOS On-Resistance ILOAD = 1A 185 mΩ Top Power NMOS Current Limit l 3.4 4.5 5.7 A Bottom Power NMOS On-Resistance 115 mΩ SW Leakage Current VIN = 42V, VSW = 40V 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 LT8609/LT8609A: VEN/UV = 2V l ±20 nA LT8609B: VEN/UV = 2V l ±30 nA PG Upper Threshold Offset from VFB LT8609/LT8609A: VFB Rising l 5 8.5 13 % LT8609B: VFB Rising l 4 8.5 14 % PG Upper Threshold Offset from VOUT LT8609A-3.3/LT8609A-5 VOUT Rising l 5 7.5 11 % PG Lower Threshold Offset from VFB LT8609/LT8609A: VFB Falling l 5 8.5 13 % LT8609B: VFB Falling l 4 8.5 14 % PG Lower Threshold Offset from VOUT LT8609A-3.3/LT8609A-5 VOUT Falling l 5 7.5 11 % 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 LT8609/LT8609A l 0.4 0.9 V Sync High Input Voltage LT8609/LT8609A: l 2.7 3.2 V INTVCC = 3.5V TR/SS Source Current l 1 2 3 µA TR/SS Pull-Down Resistance Fault Condition, TR/SS = 0.1V 300 900 Ω Spread Spectrum Modulation Frequency LT8609/LT8609A: VSYNC = 3.3V 1 3 6 kHz
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings guaranteed over the full –40°C to 125°C operating junction temperature may cause permanent damage to the device. Exposure to any Absolute range. The LT8609H/LT8609AH/LT8609AJ is guaranteed over the full Maximum Rating condition for extended periods may affect device –40°C to 150°C operating junction temperature range. High junction reliability and lifetime. Absolute Maximum Ratings are those values temperatures degrade operating lifetimes. Operating lifetime is derated at beyond which the life of a device may be impaired. junction temperatures greater than 125°C.
Note 2:
The LT8609E/LT8609AE/LT8609BE is guaranteed to meet
Note 3:
This IC includes overtemperature protection that is intended to performance specifications from 0°C to 125°C junction temperature. protect the device during overload conditions. Junction temperature will Specifications over the –40°C to 125°C operating junction temperature exceed 150°C when overtemperature protection is active. Continuous range are assured by design, characterization, and correlation with operation above the specified maximum operating junction temperature statistical process controls. The LT8609I/LT8609AI/LT8609BI is will reduce lifetime. Rev. I For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts