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AMS4154S Datasheet(PDF) 2 Page - Advanced Monolithic Systems |
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AMS4154S Datasheet(HTML) 2 Page - Advanced Monolithic Systems |
2 / 5 page Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723 AMS4154 PIN DESCRIPTION AMS4154 PIN NUMBERS NAME DESCRIPTION 1 BST Bootstrap. A capacitor is needed to drive the power switch’s drive above the supply voltage. It is connected between LX and BST pins to form a floating supply across the power switch driver. 2 VIN Supply Voltage. The AMS4154 operates from a+5.5V to +32V unregulated input. C1 is needed to prevent large voltage spikes from appearing at the input. 3 LX Switch. This connects the inductor to VIN through the internal power switch. 4 GND Ground. This pin is the ground for voltage reference and for the regulated output voltage. For this reason care must be taken in its layout. 5 FB Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets the output voltage. 6 COMP Compensation. This node is the output of the transconductance error amplifier and the input to the current comparator. Frequency compensation is done at this node by connecting a series R-C to ground. 7 EN Enable. A voltage greater than 2.5V enables operation. For complete low current shutdown the EN pin voltage needs to be less than 2.3V. 8 REF 5V reference voltage capable of supplying 1mA for other external circuits. |
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Similar Description - AMS4154S |
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