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LM34914 Datasheet(PDF) 3 Page - Texas Instruments |
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LM34914 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 21 page LM34914 www.ti.com SNVS453A – MAY 2007 – REVISED DECEMBER 2007 Pin Descriptions (continued) Pin Number Name Description Application Information 5 RTN Circuit Ground Ground for all internal circuitry other than the current limit detection. 6 FB Feedback input from the regulated Internally connected to the regulation and over-voltage output comparators. The regulation level is 2.5V. 7 SS Softstart An internal current source charges an external capacitor to 2.5V, providing the softstart function. 8 RON/SD On-time control and shutdown An external resistor from VIN to this pin sets the buck switch on-time. Grounding this pin shuts down the regulator. 9 VCC Output from the startup regulator Nominally regulated at 7.0V. Connect a 0.1 µF capacitor from this pin to RTN. An external voltage (8V to 14V) can be applied to this pin to reduce internal dissipation. An internal diode connects VCC to VIN. 10 VIN Input supply voltage Operating input range is 8.0V to 40V. EP Exposed Pad Exposed metal pad on the underside of the device. It is recommended to connect this pad to the PC board ground plane to aid in heat dissipation. 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 to RTN 44V BST to RTN 52V SW to RTN (Steady State) -1.5V BST to VCC 44V VIN to SW 44V BST to SW 14V VCC to RTN 14V SGND to RTN -0.3V to +0.3V Current out of ISEN See text SS to RTN -0.3V to 4V All Other Inputs to RTN -0.3 to 7V ESD Rating (2) Human Body Model 2kV Storage Temperature Range -65°C to +150°C JunctionTemperature 150°C (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 human body model is a 100pF capacitor discharged through a 1.5k Ω resistor into each pin. Operating Ratings (1) VIN Voltage 8.0V to 40V 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 under which operation of the device is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics. Copyright © 2007, Texas Instruments Incorporated Submit Documentation Feedback 3 Product Folder Links: LM34914 |
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