SINGLE 4A/DUAL BUCK CONVERTER RoHS compliant APPLICATIONS

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SINGLE 4A/DUAL BUCK CONVERTER RoHS compliant APPLICATIONS

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AMS4122
SINGLE 4A/DUAL BUCK CONVERTER
RoHS compliant
APPLICATIONS
Audio Power Amplifiers Portable (Notebook) Computers Point regulation high performance electronics Consumer Electronics Desktop Computers monitors Distributed Power Systems Battery Chargers Pre-Regulator Linear Regulators Independent Asynchronous Buck Converters SO-8 Internally compensated Built soft start Enable with Zero current shut down 400KHz switching output Interleaved oscillator reduced supply ripple Simply re-configures phase single output output phase mode Independent hiccup current limit
GENERAL DESCRIPTION
AMS4122 dual switching regulator capable deliver each channel. Internally Compensated internal Soft Start makes AMS4122 simplest easiest switching regulators with minimum external components. Each regulator independent hiccup current limit. Enable turns both devices when voltage 2.5V higher applied pin. Since both devices share single package thermal protection turns both devices when temperature exceeds approximately 135°C. Both regulators adjustable using 0.600V reference output voltage settings. oscillators 180° phase each other reduce ripples input power supply minimize power dissipation package. device easily configured Phase single output switching regulator capable output load. applying 2.5V greater feedback second switching regulator device enters Phase Mode. first benefit having Phase device reducing output ripples factor four single phase. second benefit higher output current capability overall cost. AMS4122 combined with AMS4123 Switching Regulator SO-8) makes complete solution power requirements.
ORDERING INFORMATION
Package Type SOIC AMS4122S TEMP. RANGE
PINCONNECTIONS
-25°C 125°C SOIC Package
PVIN F/B2 AVIN F/B1
TYPICAL APPLICATION
View
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS4122
DESCRIPTION
Number NAME PVIN F/B2 DESCRIPTION This connects inductor Internal Switch2 Input Power from unregulated power supply Ground connected ground plane. This also ground internal voltage reference. Feedback2. resistor network resistors used set-up output voltage connected between Output2 GND. node between resistors connected Feedback2 pin. Phase Mode F/B2 should connected voltage 2.5V higher Feedback1. resistor network resistors used set-up output voltage connected between Output1 GND. node between resistors connected Feedback1 pin. Enable. voltage greater than 2.5V this enables both devices operation. Input Power Analog Input Voltage that powers chip This connects inductor Internal Switch1
F/B1
PVIN SW1/AVIN
RECOMMANDED OPERATING CONDITIONS: minimum input voltage should 4.5V, however device will function 4.0V. maximum operating voltage should 16V, device will work switching loss higher. best performance 1.5A output load channel; however works well with load channel. minimum supply voltage Vout +1Vfor load Vout +1.1V load higher than 4.0V. There internal UVLO that will turn device input voltage below 4.0V. When input voltage exceeds output load current should maintain below 1.5A, switching loss device will have lower performance.
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS4122
ABSOLUTE MAXIMUM RATINGS
4.0V -0.3 +12.0V -0.3V +20V Junction Temperature Storage Temperature Lead temperature
ELECTRICAL CHARACTERISTICS
Electrical Characteristics VIN=12V (unless otherwise noted). PARAMETER Feedback voltage Full Load Output Current Feedback2 (note Phase Shift between Outputs Current Limit Phase current match Oscillator Frequency Maximum Duty Cycle Enable Threshold Enable Hysteresis Enable Pull-up Current Under Voltage Lockout Threshold Rising Under Voltage Lockout Threshold Hysteresis Supply Current (Shutdown) Supply Current (Quiescent) Thermal Shutdown Total Power dissipation Note TEST CONDITIONS F/B-1 F/B-2 Measured each channel (note Phase Mode Dual Output Mode Output Dual Phase Single Output Mode Note(2) Min. 0.590 AMS4122 Typ. Max. 0.610 Units
0.4V 2.8V; 1.5V
Notes: When 1.3V greater applied F/B2, device enters Phase Mode operation.
oscillators each switching regulator shifted each-other accommodate dual phase operation reduce ripples input power supply. power dissipation SO-8 package limited 2.5W rated 25°C ambient temperatures. thermal resistance Junction Case 45°C/W. Total power dissipation both switching regulators should taken consideration when calculating output current each regulator. load current specified output configuration. phase single output maximum load current double.
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS4122
TYPICAL PERFORMANCE WAVEFORM
AMS4122 DUAL OUTPUT Vin=12V Output Current
AMS4122 DUAL OUTPUT Vin=12V Full Load Output Current
DUAL OUTPUT Vin=7V Full Load Output Current
DUAL PHASE Full Load Output Current
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS4122
TYPICAL APPLICATION Phase Single Output Application
VOUT VREF R1/R2)
Dual Output Application
VOUT1 VREF R1/R2) VOUT2 VREF R3/R4)
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723
AMS4122
PACKAGE DIMENSIONS inches (millimeters) unless otherwise noted.
LEAD SOIC PLASTIC PACKAGE
0.189-0.197* (4.801-5.004)
0.123 (3.12) 0.137 (3.48)
0.228-0.244 (5.791-6.197)
150-0.157** (3.810-3.988)
0.090 (2.28) 0.102 (2.59)
0.053-0.069 (1.346-1.752)
0.010-0.020 (0.254-0.508) 0.004-0.010 (0.101-0.254) 0.008-0. (0.203-0.254) 0°-8
0.014-0.019 (0.355-0.483)
0.050 (1.270)
0.016-0.050 (0.406-1.270)
(SO- DRW# 042293
0.024(0.61) 0.063(1.60)
0.050(1.27)
*DIMENSION DOES INCLUDE MOLD FLASH. MOLD FLASH SHALL EXCEED 0.006" (0.152mm) SIDE **DIMENSION DOES INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL EXCEED 0.010" (0.254mm) SIDE
0.105(2.67)
0.213(5.41)
0.138 (3.50) RECOMMENDED LAYOUT PATTERN
Advanced Monolithic Systems, Inc. www.advanced-monolithic.com
Phone (925) 443-0722
(925) 443-0723

SINGLE 4A/DUAL BUCK CONVERTER RoHS compliant APPLICATIONS

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