Datasheet LT8471 (Analog Devices) - 4

LT8471
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN1 = VIN2 = 5V, unless otherwise noted (Note 2). PARAMETER CONDITIONS MIN TYP MAX UNITS
Switch Current Limit (Primary Channels) Minimum Duty Cycle (Note 3) l 2.1 2.55 3.2 A Maximum Duty Cycle (Notes 3, 4) l 1.35 1.8 2.5 A Switch Current Limit (Skyhook) (Note 3) l 400 500 600 mA Primary Switches VCESAT IC1 or IC2 = 1.5A 300 mV Skyhook Switch VCESAT IC3 = 250mA 250 mV C1, C2 Leakage Current VC1 = VC2 = 12V, VE1 = VE2 = 0V, VOV/UV = 0V, 0.01 1 μA Current into Pin C3 Leakage Current VC3 = 12V, VOV/UV = 0V 0.01 1 μA E1, E2 Leakage Current VOV/UV = 0V, Current Out of Pin VC1 = VC2 = 20V, VE1 = VE2 = 5V 0.01 1 µA VC1 = VC2 = 5V, VE1 = VE2 = –10V 0.01 1 µA Schottky Reverse Leakage VREVERSE = 12V 0.01 1 µA VREVERSE = 50V 0.02 2 µA Schottky Forward Voltage IDIODE = 100mA 650 mV
Start-Up Characteristics
Soft-Start Charge Current VSS1, VSS2 = 50mV, Current Flows Out of l 5.5 8.5 11.5 µA SS1, SS2 Pins OV/UV Current for OVLO Current into OV/UV Pin. VOV/UV Internally Clamped l 76 80 84 µA to 1.37V, Current Rising OV/UV Pin Bias Current VOV/UV =1V 0.01 0.5 µA OV/UV Minimum Input Voltage High Active Mode, OV/UV Rising l 1.165 1.215 1.265 V Active Mode, OV/UV Falling l 1.13 1.18 1.22 V OV/UV Input Voltage Low Shutdown Mode l 0.3 V FB Pin Threshold for Power Good FB Rising l 715 740 765 mV (Positive Output Voltage) FB Falling l 708 730 752 mV FB Pin Threshold for Power Good FB Falling l –766 –736 –706 mV (Negative Output Voltage) FB Rising l –755 –727 –699 mV PG1, PG2 Voltage Output Low VFB = 0.6V, IPG = 250μA 0.32 0.6 V PG1, PG2 Leakage VPG1, VPG2 = 12V, PG Driver Off 0.01 1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Current limit guaranteed by design and/or correlation to static test. may cause permanent damage to the device. Exposure to any Absolute
Note 4:
Current Limit measured at equivalent switching frequency of 1MHz. Maximum Rating condition for extended periods may affect device
Note 5:
This IC includes overtemperature protection that is intended reliability and lifetime. to protect the device during momentary overload conditions. Junction
Note 2:
The LT8471E is guaranteed to meet performance specifications from temperature will exceed 150°C when overtemperature protection is active. 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C Continuous operation above the specified maximum operating junction operating junction temperature range are assured by design, characterization temperature may impair device reliability. and correlation with statistical process controls. The LT8471I is guaranteed
Note 6:
Low side and high side configurations are discussed in the Switch over the full –40°C to 125°C. The LT8471H is guaranteed over the full –40°C Configurations and the Skyhook Regulator section. to 150°C operating junction temperature range. Operating lifetime is derated at junction temperatures greater than 125°C.
Note 7:
Minimum switch on-time, off-time is guaranteed by design. 8471fd 4 For more information www.linear.com/8471 Document Outline Features Applications Description 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 Related Parts