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LM34930 Fiches technique(PDF) 2 Page - Texas Instruments |
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LM34930 Fiches technique(HTML) 2 Page - Texas Instruments |
2 / 24 page VCC D 1 SW SW VIN VIN BST ISEN RT SS D3 D2 C3 C2 C1 A3 A2 A1 B1 B2 B3 SGND nOV FB A3 A2 A1 B3 B2 B1 D3 D2 D1 C3 C2 C1 LM34930 SNVS571B – MAY 2008 – REVISED APRIL 2013 www.ti.com Connection Diagram Figure 1. Bump Side Figure 2. Top View PIN DESCRIPTIONS Pin No. Name Description Application Information A1 GND Ground Ground for all internal circuitry A2 nOV Input over-voltage indicator Open drain output switches low when Vin exceeds the over-voltage indicator threshold A3 FB Output voltage feedback Internally connected to the regulation comparator. The regulation level is 2.52V. B1 ISEN Current sense The re-circulating current flows out of this pin to the free-wheeling diode. B2 RT On-time control An external resistor from VIN to this pin sets the buck switch on-time, and the switching frequency. B3 SS Soft-Start An internal current source charges an external capacitor to provide the soft-start function. C1, C2 VIN Input supply voltage Operating input range is 8V to 33V, with over-voltage shutdown internally set at 36V. Absolute maximum transient capability is 44V. C3 VCC Output of the internal bias regulator Nominally regulated at 7V. D1, D2 SW Switching node Internally connected to the buck switch source. Connect to the external inductor, free wheeling diode, and bootstrap capacitor. D3 BST Bootstrap capacitor connection of the Connect a 0.022 µF capacitor from SW to this pin. The capacitor is buckswitch gate driver charged during the buck switch off-time via an internal diode. 2 Submit Documentation Feedback Copyright © 2008–2013, Texas Instruments Incorporated Product Folder Links: LM34930 |
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