G5E1286

ISSUED DATE :2005/07/11 REVISED DATE :2006/03/29B G5E1286 The G5E1286 is 1.5A 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. 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator Description Features & maximum dropout voltage at 1.5A load current 0.5V Package Dimensions &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 REF. A b c D E L4 Millimeter Min. Max. 4.40 4.80 0.76 1.00 0.36 0.50 8.60 9.00 9.80 10.4 14.7 15.3 REF. L5 c1 L e L1 Ø Millimeter Min. Max. 6.20 6.60 1.25 1.45 13.25 14.25 1.70 REF. 2.60 2.89 3.71 3.96 Typical Application 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 r egulation. A minimum of 10uF 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 100uF c apacitor must be connected from this pin to ground to insure stability. The output of the regulator. A minimum of 100uF c apacitor must be connected from this pin to ground to insure stability. Vctrl Vout I O G5E1286 Page: 1/4 ISSUED DATE :2005/07/11 REVISED DATE :2006/03/29B Absolute Maximum Ratings Symbol Vin Vctrl PD TST TOP Input Voltage C ontrol Input Voltage P ower Dissipation (with heat sink or amount of copper board needed.) Storage Temperature Range Operating Junction Temperature Range Parameter Ratings 16 18 2.4 ~ 4.4 -65 ~ + 150 0 ~ + 150 Unit V V W Electrical Characteristics Unless otherwise specified, these specifications apply over, Cin=1uF, Cout=10uF, and TJ =0 to 150 : . Typical value refer to TJ =25 : . Vout=Vsense Parameter Conditions MIN TYP MAX UNIT R eference Voltage G5E1286-ADJ G5E1286-15 G5E1286-18 Output Voltage G5E1286-25 G5E1286-33 G5E1286-50 Line Regulator G5E1286-XX G5E1286-ADJ G5E1286-15 Load Regulation G5E1286-18 G5E1286-25 G5E1286-33 G5E1286-50 Dropout Voltage (Vctrl-Vout) G5E1286-ADJ (fixed model) G5E1286-ADJ Dropout Voltage (Vin-Vout) G5E1286-15 G5E1286-18 G5E1286-25 G5E1286-33 G5E1286-50 Current Limit Minimum Load Current Thermal Regulation Ripple Rejection Vctrl=3.0V, Vin=2.05V, Vo=100mV, Vadj=0V Vctrl=5V, Vin=3.3V, Vadj=0V 30ms pulse Vctrl=5V, Vin=5V, Io=1.5A, Vadj=0V, TJ=25 : , Vripple=1Vpp at 120Hz G5E1286-ADJ G5E1286-15 C ontrol Pin Current G5E1286-18 G5E1286-25 G5E1286-33 G5E1286-50 Adjust Pin Current JC ‡ hermal T Io=10mA, TJ =25 : Io=10mA, TJ =25 : Io=10mA, TJ =25 : Io=10mA, TJ =25 : Io=10mA, TJ =25 : Io=10mA, TJ =25 : Io=10mA, TJ =25 : , ( Vin-Vout)=0.5V, Vctrl=Vin+1V , 2.0V Vin 12V, Vctrl=Vin+1V , 2.3V Vin 12V, Vctrl=Vin+1V , 3.0V Vin 12V, Vctrl=Vin+1V , 3.8V Vin 12V, Vctrl=Vin+1V , 5.5V Vin 12V, Vctrl=Vin+1V , Vout+0.5< Vin