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Advanced Monolithic Systems

AMS4122 Datasheet Preview

AMS4122 Datasheet

SINGLE 4A/DUAL 2A BUCK CONVERTER

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Advanced
Monolithic
Systems
AMS4122
SINGLE 4A/DUAL 2A BUCK CONVERTER IN SO8
RoHS compliant
FEATURES
2 Independent Asynchronous Buck Converters in SO-8
Internally compensated
Built in soft start
Enable with Zero current shut down
400KHz switching per output
Interleaved oscillator to reduced supply ripple
Simply re-configures to 2 phase single output
Up to 4A output in 2 phase mode
Independent hiccup current limit
APPLICATIONS
Audio Power Amplifiers
Portable (Notebook) Computers
Point of regulation for high performance electronics
Consumer Electronics
Desktop Computers
LCD TVs and LCD monitors
Distributed Power Systems
Battery Chargers
Pre-Regulator for Linear Regulators
GENERAL DESCRIPTION
AMS4122 is a dual switching regulator capable to deliver 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
Package Type
SOIC EDP
AMS4122S
TEMP. RANGE
-25°C to 125°C
TYPICAL APPLICATION
PINCONNECTIONS
8L SOIC
SO Package (S)
SW2 1
PVIN 2
GND 3
F/B2 4
8 SW1
7 AVIN
6 EN
5 F/B1
Top View
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723




Advanced Monolithic Systems

AMS4122 Datasheet Preview

AMS4122 Datasheet

SINGLE 4A/DUAL 2A BUCK CONVERTER

No Preview Available !

www.DataSheet4U.com
AMS4122
PIN DESCRIPTION
Pin Number
NAME
1 SW2
2 PVIN SW2
3 GND
4 F/B2
5 F/B1
6 EN
7 PVIN SW1/AVIN
8 SW1
DESCRIPTION
This connects the inductor the Internal Switch2
Input Power Pin for SW2 from unregulated power supply
Ground Pin connected to PCB ground plane. This pin is also the ground for internal
voltage reference.
Feedback2. A resistor network of two resistors is used to set-up the output voltage
connected between Output2 to GND. The node between the two resistors is connected to
Feedback2 pin. In Two Phase Mode F/B2 should be connected to a voltage 2.5V or
higher
Feedback1. A resistor network of two resistors is used to set-up the output voltage
connected between Output1 to GND. The node between the two resistors is connected to
Feedback1 pin.
Enable. A voltage greater than 2.5V at this pin enables both devices operation.
Input Power Pin for SW1 and Analog Input Voltage that powers up the chip
This connects the inductor the Internal Switch1
RECOMMANDED OPERATING CONDITIONS: The minimum input voltage should be 4.5V, however the device will
function as low as 4.0V. The maximum operating voltage should be 16V, the device will work at 17V but the switching loss is
higher. The best performance is at 1.5A output load per channel; however it works well with 2A load per channel. The minimum
supply voltage is Vout +1Vfor 1A load and Vout +1.1V for 2A load but higher than 4.0V. There is an internal UVLO that will
turn off the device if the input voltage is below 4.0V. When the input voltage exceeds 12V the output load current should be
maintain below 1.5A, due to switching loss the device will have lower performance.
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723


Part Number AMS4122
Description SINGLE 4A/DUAL 2A BUCK CONVERTER
Maker Advanced Monolithic Systems
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AMS4122 Datasheet PDF





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