S5U1284 Datasheet | SeCoS Halbleitertechnologie GmbH

Description The S5U1284 is 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 pliexity associated with switching regulator. One such application is the new graphic chipsets that requires anywhere from 2.4V to 2.7V supply. Features - 0.7V Max. Dropout Voltage At 4A Load Current - Adjustable or Fixed Output Voltage 1.5V,1.8V,2.5V,3.3V,5.0V - Output Current Limiting - Good Noise Rejection - Fast Transient Response - Built-in Thermal Shutdown REF. A b L4 c L1 E Millimeter Min. Max. 4.40 4.80 0.66 0.91 0.00 0.30 B 0.36 0.5 2.29 2.79 9.80 10.4 REF. c2 L2 D e L Millimeter Min. Max. 1.25 1.45 1.27 REF. 8.6 9.0 1.70 REF. 14.6 15.8 0˚ 8˚ Typical Circuit S5U1284-25 Block Diagram Pin Descriptions Name Adj (Gnd) Vsense Vin I I I/O Description A resistor divider from this pin to the Vout pin and ground sets the output voltage. (Gnd only for fixed mode) The pin is the positive side of the reference that allows remote load sensing to achieve excellent load regulation. A minimum of 10u F capacitor must be connected from this pin to ground to insure stability. The input pin of 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 100u F capacitor must be connected from this pin to ground to insure stability. The output of the regulator. A minimum of 100u F capacitor must be connected from this pin to ground to insure stability. Any changing...