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LM2695MHX Datasheet(PDF) 3 Page - National Semiconductor (TI) |
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LM2695MHX Datasheet(HTML) 3 Page - National Semiconductor (TI) |
3 / 14 page Pin Descriptions Pin Number Name Description Application Information LLP-10 TSSOP-14 1 2 SW Switching Node Internally connected to the buck switch source. Connect to the inductor, free-wheeling diode, and bootstrap capacitor. 2 3 BST Boost pin for bootstrap capacitor Connect a 0.022 µF capacitor from SW to this pin. The capacitor is charged from V CC via an internal diode during each off-time. 34 I SEN Current sense The re-circulating current flows through the internal sense resistor, and out of this pin to the free-wheeling diode. Current limit is nominally set at 1.25A. 45 S GND Sense Ground Re-circulating current flows into this pin to the current sense resistor. 5 6 RTN Circuit Ground Ground for all internal circuitry other than the current limit detection. 6 9 FB Feedback input from the regulated output Internally connected to the regulation and over-voltage comparators. The regulation level is 2.5V. 7 10 SS Softstart An internal 12.3 µA current source charges an external capacitor to 2.5V, providing the softstart function. 811 R ON/SD On-time control and shutdown An external resistor from V IN to this pin sets the buck switch on-time. Grounding this pin shuts down the regulator. 912 V CC Output from the startup regulator Nominally regulates at 7.0V. An external voltage (8V-14V) can be applied to this pin to reduce internal dissipation. An internal diode connects V CC to V IN. 10 13 V IN Input supply voltage Nominal input range is 8.0V to 30V. 1,7,8,14 NC No connection. No internal connection. 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. www.national.com 3 |
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