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AMS4122S Datasheet(PDF) 1 Page - Advanced Monolithic Systems

No. de pieza AMS4122S
Descripción Electrónicos  SINGLE 4A/DUAL 2A BUCK CONVERTER IN SO8
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Fabricante Electrónico  ADMOS [Advanced Monolithic Systems]
Página de inicio  http://www.advanced-monolithic.com
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AMS4122S Datasheet(HTML) 1 Page - Advanced Monolithic Systems

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Advanced Monolithic Systems, Inc.
www.advanced-monolithic.com
Phone (925) 443-0722 Fax (925) 443-0723
Advanced
AMS4122
Monolithic
SINGLE 4A/DUAL 2A BUCK CONVERTER IN SO8
Systems
RoHS compliant
FEATURES
APPLICATIONS
• 2 Independent Asynchronous Buck Converters in SO-8
• Audio Power Amplifiers
• Internally compensated
• Portable (Notebook) Computers
• Built in soft start
• Point of regulation for high performance electronics
• Enable with Zero current shut down
• Consumer Electronics
• 400KHz switching per output
• Desktop Computers
• Interleaved oscillator to reduced supply ripple
• LCD TVs and LCD monitors
• Simply re-configures to 2 phase single output
• Distributed Power Systems
• Up to 4A output in 2 phase mode
• Battery Chargers
• Independent hiccup current limit
• Pre-Regulator for Linear Regulators
GENERAL DESCRIPTION
AMS4122 is a dual switching regulator capable to deliver up to 2A for each channel. Internally Compensated internal Soft Start
makes AMS4122 one of the simplest and easiest switching regulators to use with the minimum external components. Each
regulator has independent hiccup current limit. The Enable pin turns both devices on when a voltage of 2.5V or higher it is
applied to EN pin. Since both devices share one single package the thermal protection turns off both devices when the die
temperature exceeds approximately 135°C. Both regulators are adjustable using a 0.600V reference for low output voltage
settings. The oscillators are 180° phase to each other to reduce the ripples on the input power supply and minimize the power
dissipation on the package. The device can be easily configured for Two Phase single output switching regulator capable of 5A
output load. By applying a 2.5V or greater on feedback pin of the second switching regulator the device enters in Two Phase
Mode. The first benefit of having a Two Phase device is reducing the output ripples by a factor of four as the single phase. The
second benefit is higher output current capability at overall low cost. AMS4122 combined with AMS4123 (2A Switching
Regulator + 1A LDO in SO-8) makes complete solution for LCD TV power requirements.
ORDERING INFORMATION
PINCONNECTIONS
TYPICAL APPLICATION
Package Type
SOIC EDP
TEMP. RANGE
AMS4122S
-25°C to 125°C
8L SOIC
SO Package (S)
2
8
3
4
7
6
5
EN
F/ B 1
F/ B 2
P1+AVIN
P2VIN
GND
1
SW 1
SW 2
Top View


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