BUCK CONVERTER. AMS4154 Datasheet

AMS4154 CONVERTER. Datasheet pdf. Equivalent

Part AMS4154
Description 2A OUTPUT PWM BUCK CONVERTER
Feature www.DataSheet4U.com Advanced Monolithic Systems AMS4154 2A OUTPUT PWM BUCK CONVERTER RoHS complia.
Manufacture Advanced Monolithic Systems
Total Page 5 Pages
Datasheet
Download AMS4154 Datasheet



AMS4154
Advancedwww.DataSheet4U.com
Monolithic
Systems
FEATURES
Stable with low ESR Output Ceramic Capacitors
Up to 99% On time
2A Output Current
Wide Operating Input Voltage Range 5.5V to 32V
Fixed 330 kHz Frequency
Thermal Shutdown
Cycle-by-cycle Over Current Protection
Under Voltage Lockout
5V reference output
Adjustable output from 0.6V
AMS4154
2A OUTPUT PWM BUCK CONVERTER
RoHS compliant
APPLICATIONS
Battery Chargers
Portable (Notebook) Computers
Industrial power supply
Point of regulation for high performance electronics
Consumer Electronics
Audio Power Amplifiers
Distributed Power Systems
Pre-Regulator for Linear Regulators
LCD TVs and LCD monitors
Automotive electronics
GENERAL DESCRIPTION
The AMS4154 is a step-down converter for high voltage applications. Current mode operation provides easier compensation
and fast transient response. Internal cycle-by-cycle current limiting and thermal shutdown provides the necessary protection in
faults situation. A 5V reference voltage is available that can supply up to 2mA current.
ORDERING INFORMATION
OUTPUT PACKAGE TYPE TEMP. RANGE
VOLTAGE 8 Lead SOIC
Adjustable AMS4154S
-25°C to 125°C
TYPICAL APPLICATION
ON
OFF
VIN
EN
BST
LX
10µF
3.9K
COMP
VREF
GND
F/B
4.7n
470n
L1
4.7µH
B 220
2.5V/2A
31.7K
22µF
10K
PIN CONNECTIONS
8L SOIC
SO Package (S)
BST 1
VIN 2
LX 3
GND 4
8 REF
7 EN
6 COMP
5 F/B
Top View
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723



AMS4154
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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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