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LM3485MMX Folha de dados(PDF) 2 Page - Texas Instruments |
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LM3485MMX Folha de dados(HTML) 2 Page - Texas Instruments |
2 / 23 page LM3485 SNVS178G – JANUARY 2002 – REVISED FEBRUARY 2013 www.ti.com Connection Diagram Figure 1. Top View 8-Lead Plastic VSSOP-8 Package Number DGK (S-PDSO-G8) PIN DESCRIPTIONS Pin Name Pin Description No. ISENSE 1 The current sense input pin. This pin should be connected to Drain node of the external PFET. GND 2 Signal ground. NC 3 No connection. FB 4 The feedback input. Connect the FB to a resistor voltage divider between the output and GND for an adjustable output voltage. ADJ 5 Current limit threshold adjustment. It connects to an internal 5.5µA current source. A resistor is connected between this pin and the input Power Supply. The voltage across this resistor is compared with the VDS of the external PFET to determine if an over-current condition has occurred. PWR GND 6 Power ground. PGATE 7 Gate Drive output for the external PFET. PGATE swings between VIN and VIN-5V. VIN 8 Power supply input pin. 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) VIN Voltage −0.3V to 36V PGATE Voltage −0.3V to 36V FB Voltage −0.3V to 5V ISENSE Voltage −1.0V to 36V ADJ Voltage −0.3V to 36V Maximum Junction Temperature 150°C Power Dissipation 417mW at TA = 25°C ESD Susceptibility Human Body Model(2) 2kV Lead Temperature Vapor Phase (60 sec.) 215°C Infrared (15 sec.) 220°C Storage Temperature −65°C to 150°C (1) Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to be functional, but device parameter specifications may not be ensured. For specifications and test conditions, see the Electrical Characteristics. (2) The human body model is a 100 pF capacitor discharged through a 1.5k Ω resistor into each pin. Operating Ratings (1) Supply Voltage 4.5V to 35V Operating Junction Temperature −40°C to +125°C (1) Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended to be functional, but device parameter specifications may not be ensured. For specifications and test conditions, see the Electrical Characteristics. 2 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: LM3485 |
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