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LM34914 데이터시트(PDF) 2 Page - Texas Instruments |
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LM34914 데이터시트(HTML) 2 Page - Texas Instruments |
2 / 24 page SW BST RTN VCC FB SS VIN 10 9 8 7 6 5 4 3 2 1 RON/SD SGND ISEN LM34914 SNVS453B – MAY 2006 – REVISED MARCH 2013 www.ti.com Connection Diagram 10-Lead WSON PIN DESCRIPTIONS Pin Number Name Description Application Information Internally connected to the buck switch source. Connect to 1 SW Switching Node the inductor, diode, and bootstrap capacitor. Connect a 0.022 µF capacitor from SW to this pin. The 2 BST Boost pin for bootstrap capacitor capacitor is charged each off-time via an internal diode. The re-circulating current flows out of this pin to the free- 3 ISEN Current sense wheeling diode. Re-circulating current flows into this pin to the current sense 4 SGND Sense Ground resistor. Ground for all internal circuitry other than the current limit 5 RTN Circuit Ground detection. Feedback input from the regulated Internally connected to the regulation and over-voltage 6 FB output comparators. The regulation level is 2.5V. An internal current source charges an external capacitor to 7 SS Softstart 2.5V, providing the softstart function. An external resistor from VIN to this pin sets the buck switch 8 RON/SD On-time control and shutdown on-time. Grounding this pin shuts down the 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 9 VCC Output from the startup regulator 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. Exposed metal pad on the underside of the device. It is EP Exposed Pad 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. 2 Submit Documentation Feedback Copyright © 2006–2013, Texas Instruments Incorporated Product Folder Links: LM34914 |
유사한 부품 번호 - LM34914_15 |
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유사한 설명 - LM34914_15 |
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