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AX1184 Dataheets PDF



Part Number AX1184
Manufacturers AXElite
Logo AXElite
Description 4A Ultra Low Dropout Positive Linear Regulator
Datasheet AX1184 DatasheetAX1184 Datasheet (PDF)

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.

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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 VÛm w`R •yÑb € ww w.g ofot ec h.co m Packing Blank : Tube A : Taping „ Typical Application VIN+2.5V VIN+5V 1 2 4 5 C1 100uF C2 100uF AX1184-ADJ Vsense ADJ/GND Vctrl VIN VOUT 3 R1 100 R2 220 Vout=1.8V C3 100uF VOUT = VREF x (1+ R2 ) R1 VREF = 1.250V 1/10 Axelite Confidential Materials, do not copy or distribute without written consent 1/11 Rev.1.0 Jan.16, 2008 cˆgCNãtUFÿmñW3^VÛmw`R•yÑb€g–PQlSø u5‹Ýÿ 0755-8398 3377 135 9011 2223 http://www.gofotech.com 4A Ultra Low Dropout Positive Linear Regulator AX1184 „ Block Diagram Vin Vctrl CURRENT LIMIT + + 1.25V + THERMAL SHUTDOWN Adj/ GND + Vout Vsense „ Pin Configuration TOP VIEW 5 4 3 2 1 Vsense Vin Vctrl Adj(GND) Vout Vctrl Adj(GND) Vsense Vin 1 2 3 4 TOP VIEW 8 7 6 5 Vout Vout Vout Vout Tab is Vout TOP VIEW 5 4 3 2 1 Vin Vctrl Vout Adj(GND) Vsense Tab is Vout (AX1184M5) VÛm w`R •yÑb € ( AX1184S ) (AX1184T5) „ Pin Descriptions Name Adj (GND) Vsense Vin I/O Description A resistor divider from this pin to the Vout pin and ground sets the output voltage. (GND only for fixed mode) This pin is the positive side of the reference that allows remote load sensing to achieve excellent load regulation. The input of the regulator. Typically a large storage capacitor is connected from this pin to ground to insure that the input voltage does not sag below the minimum dropout voltage during the load transient response. This pin must always be higher than Vout in order for the device to regulate. This pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor. This pin must always by higher than the Vout pin in order the device to regulate. A minimum of 100uF capacitor must be connected from this pin to ground to insure stability. ww w.g ofot ec h.co m I I Vctrl I Vout O The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground to insure stability. 2/10 Axelite Confidential Materials, do not copy or distribute without written consent Rev.1.0 Jan.16, 2008 cˆgCNãtUFÿmñW3^VÛmw`R•yÑb€g–PQlSø u5‹Ýÿ 0755-8398 3377 135 9011 2223 http://www.gofotech.com 4A Ultra Low Dropout Positive Linear Regulator AX1.


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