PDF AX1184 Data sheet ( Hoja de datos )

Número de pieza	AX1184
Descripción	4A Ultra Low Dropout Positive Linear Regulator
Fabricantes	AXElite
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No Preview Available ! AX1184 4A Ultra Low Dropout Positive Linear Regulator Feature • 0.7V maximum dropout voltage at 4A load current • Built-in Thermal shutdown • Output current limiting • Adjustable output voltage: 1.250V • Fast transient response • Good noise rejection • Packages: SOP-8L, TO220-5L and TO263-5L General Description AX1184 is a 4A regulator with extremely low dropout voltage. This product is specifically designed to provide well regulated supply for applications requiring 2.8V or lower voltages from 3.3V ATX power supplies where high efficiency of the switch can be achieved without the cost and complexity associated with switching regulator. One such application is the new graphic chipsets that requires anywhere from 2.4V to 2.7V supply. Ordering Information AX1184 X X Package S:SOP-8L M5:TO263-5L T5:TO220-5L Packing Blank : Tube A : Taping Typical Application VIN+2.5V VIN+5V C1 100uF C2 100uF AX1184-ADJ 1 Vsense 2 ADJ/GND 4 Vctrl VOUT 5 VIN 3 VOUT = VREF x (1+ R2 ) VREF = 1.250V R1 Vout=1.8V R1 100 C3 100uF R2 220 Axelite Confidential Materials, do not copy or distribute without written consent 1/11 1/10 Rev.1.0 Jan.16, 2008 1 page 0755-8398 3377 135 9011 2223 http://www.gofotech.com AX1184 Vin Vctrl Vin Vctrl AX1184 Adj Vout Vsense R1 R2 RL Stability The AX1184 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. Typical designs for the microprocessor applications use standard electrolytic capacitors with typical ESR in the range of 50 to 100mΩ and an output capacitance of 100uF to 1000uF. Fortunately as the capacitance increases, the ESR decreases resulting in a fixed RC time constant. The AX1184 takes advantage of the phenomena in making the overall regulator loop stable. For most applications a minimum of 100uF aluminum electrolytic capacitor insures both stability and good transient response. Thermal Design The AX1184 incorporates an internal thermal shutdown that protects the device when the junction temperature exceeds the allowable maximum junction temperature. Although this device can operate with junction temperatures in the range of 150oC, it is recommended that the selected heat sink be chosen such that during maximum continuous load operation, the junction temperature is kept below this number. The example below shows the steps in selecting the proper surface mount package. Assuming, the following conditions: Vout=2.5V Vin=3.3V Vctrl=5V Iout=2A DC Avg. Calculate the maximum power dissipation using the following equation: Pd=Iout(Vin-Vout)+(Iout/60)(Vctrl-Vout) Pd=2(3.3-2.5)+(2/60)(5-2.5)=1.68W Using table below select the proper package and the amount of copper board needed. Package SOP8 TO263 Copper Area 2.0” X 2.0” Pad Size-2”X2” θJA (oC/W) 65 25-45 Max Pd (Ta=25oC) 1.7W 2.4W-4.4W Max Pd (Ta=45oC) 1.4W 2.0W-3.6W Note: Above table is based on the maximum junction temperature of 135oC. As shown in the above table, any of the two packages will do the job. For low cost applications the SOP7 package is recommended. Axelite Confidential Materials, do not copy or distribute without written consent 4/11 Rev.0.1 May.02, 2007 5 Page

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