AP1184K518A

AP1184 4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Feature 0.7V maximum dropout voltage at 4A load current Built-in Thermal shutdown • Output current limiting • Adjustable or fixed output voltage 1.5V, 1.8V, 2.5V, 3.3V, 5.0V • Fast transient response • Good noise rejection • Packages: SOP-7L, TO220-5L and TO263-5L • • General Description AP1184 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 AP1184 X X X X Low Dropout Regulator Package S7:SOP-7L K5:TO263-5L T5:TO220-5L Vout Blank : Adj 15 = 1.5V 18 = 1.8V 25 = 2.5V 33 = 3.3V 50 = 5.0V Lead Free Blank : Normal L : Lead Free Package Packing Blank : Tube A : Taping Typical Application 3.3V + 470uF GND Vsense 5V + 470uF Vin Vin Vctrl NC Vout 2.5V/4A Vout + 470uF AP1184-2.5V This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev.1.1 Sep 7, 2004 1/11 AP1184 4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Block Diagram Vin Vctrl + + CURRENT LIMIT THERMAL SHUTDOWN 1.25V + Adj + Vout Vsense Pin Configuration FRONT VIEW 5 4 3 2 1 Tab is Vout Vin Vctrl Vout Adj(GND) Vsense Adj(GND) Vsense Vctrl Vin 1 2 3 4 8 7 6 5 NC Vout Vin FRONT VIEW 5 4 3 2 1 Tab is Vout Vin Vctrl Vout Adj(GND) Vsense (AP1184K5) ( AP1184S7 ) (AP1184T5) Pin Descriptions Pin Numbers with standard type are for TO220-5L, TO263-5L packages, and those with boldface type are for SOP-7L Name Adj (GND) Vsense I/O I Vin I Vctrl NC Vout 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. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability. 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. No connection The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground to insure stability. Anachip Corp. www.anachip.com.tw 2/11 Rev.1.1 Sep 7, 2004 AP1184 4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Absolute Maximum Ratings Symbol VIN Vctrl PD TST TOP Input Voltage Control Input voltage Power dissipation Storage temperature Range Operation Junction Temperature Range Parameter Rating 16 18 Internally limited -65 to +150 0 to +150 o o Unit V V C C Electrical Characteristics Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and Tj=0 to 150 C. Typical value refer to Tj=25 C. Vout=Vsense. o o Sym. Parameter Test Condition Io=10mA, Tj=25 C, (Vin-Vout)=0.7V, AP1184-Adj Vctrl=VIN+1V o IO=10mA, VOUT+0.7V