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LM5068 Datasheet(PDF) 3 Page - Texas Instruments |
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LM5068 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 30 page LM5068 www.ti.com SNVS254B – MAY 2004 – REVISED DECEMBER 2004 Pin Description (continued) PIN NAME DESCRIPTION APPLICATION INFORMATION 5 SENSE Current Sense Input Load current is monitored via an external current sense resistor (Rs). If the voltage across Rs exceeds 50mV the fault timer is initiated. Load current is actively limited to 100mV/Rs. If the sense voltage exceeds 200mV due to a catastrophic fault, the fast gate pull down circuit will reduce the MOSFET gate voltage and initiate active current limiting. 6 GATE N-Channel MOSFET Gate Drive Output This output is pulled high by a 60 µA current source to turn on the MOSFET. 7 TIMER Timer Input An external capacitor connected to this pin sets the initial start-up delay and the delay to shutdown in the event of an over-current condition. This pin is also used for the automatic re-try timing sequence, following fault shutdown (-2 and –4 versions). 8 VDD Positive Supply Voltage Input Configuration Table Part Number Latch Off /Successive Re-try Power Good Polarity Package LM5068MM-1/MMX-1 Latch Off Active HIGH MSOP- 8 LM5068MM-2/MMX-2 Auto Re-try Active HIGH LM5068MM-3/MMX-3 Latch Off Active LOW LM5068MM-4/MMX-4 Auto Re-try Active LOW These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Absolute Maximum Ratings (1) VDD (VDD to VEE) 100V PWRGD (PWRGD to VEE) 100V SENSE (SENSE to VEE) 8V UV/OV (Clamped) (UV/OV to VEE) 8V All Other Inputs to VEE 16V Junction Temperature (TJ) +150°C Storage Temperature (TS) -55°C to +150°C Soldering Information ESD Rating (2) 2kV (1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics. (2) The ESD rating of Pin 7 is 1.5kV. It is recommended that proper ESD precautions are taken to avoid performance degradation or loss of functionality. Operating Ratings Supply Voltage Range (VDD) 10V to 90V Junction Temp. Range −40°C to +105°C Copyright © 2004, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM5068 |
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