AMS4154 データシートの表示（PDF） - Advanced Monolithic Systems Inc
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AMS4154 Datasheet PDF : 5 Pages
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PIN DESCRIPTION
AMS4154
PIN
NUMBERS
1
NAME
BST
2
VIN
3
LX
4
GND
5
FB
6
COMP
7
EN
8
REF
AMS4154
DESCRIPTION
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.
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.
Switch. This connects the inductor to VIN through the internal power switch.
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.
Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets
the output voltage.
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.
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.
5V reference voltage capable of supplying 1mA for other external circuits.
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723
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