us1260 ETC-unknow, us1260 Datasheet
us1260
Available stocks
Related parts for us1260
us1260 Summary of contents
Page 1
... DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR DESCRIPTION DESCRIPTION The US1260 product using a proprietary process com- bines a dual low drop out adjustable output regulators in a single package with one output having a minimum of 6A and the other one having a 1A output current capabil- ity ...
Page 2
... US1260 ABSOLUTE MAXIMUM RATINGS ABSOLUTE MAXIMUM RATINGS Input Voltage (Vin) ............................................................. Power Dissipation ............................................ Storage Temperature Range ................................ Operating Junction Temperature Range ...................... 150 C PACKAGE INFORMATION PACKAGE INFORMATION 7 PIN PLASTIC TO220 FRONT VIEW 7 Vout1 Vin 6 5 Vout2 4 Gnd 3 Vfb2 2 Vfb1 Vctrl 1 =2.7 C/W =60 C ELECTRICAL SPECIFICATIONS ELECTRICAL SPECIFICATIONS Unless otherwise specified ,these specifications apply over ,Cin=1 uF,Cout=10uF,and Tj=0 to 150 C ...
Page 3
... A high frequency capacitor is connected between this pin and Vin pin to insure stability. BLOCK DIAGRAM BLOCK DIAGRAM Vin 6 Vctrl 1 Figure 1 - Simplified block diagram of the US1260 Rev. 1.9 3/22/99 voltage. See application ckt for the divider setting for 1.5V output. THERMAL + SHUTDOWN 1.20V US1260 ...
Page 4
... Figure 3 shows that the best load regulation is achieved when the bottom side of R1 resistor is connected di- rectly to the ground pin of US1260 (preferably to the tab of the device) and the top side of R2 resistor is con- nected to the load. In fact , connected to the load ...
Page 5
... Stability The US1260 requires the use of an output capacitor as part of the frequency compensation in order to make the regulator stable. Typical designs for the microproces- sor applications use standard electrolytic capacitors with typical ESR in the range 100 m and the output capacitance of 500 to 1000uF. Fortunately as the ca- pacitance increases, the ESR decreases resulting in a fixed RC time constant ...
Page 6
... US1260 in a single supply with the second LDO being disabled. 3-6 In this application, the US1260 is used on the VGA card to convert 3.3V supply to 2.7V to power the Intel 740 chip rather than the conventional LDO which due to its 1.5V minimum dropout spec must use the 5V supply to achieve the same result ...
Page 7
... TYPICAL APPLICATION TYPICAL APPLICATION PENTIUM APPLICATION 3.3V U1 US1260 1260app7-1.0 5V Figure 4 - Typical application of US1260 in the Pentium Notes: Pentium is trade mark of Intel Corp. Ref Desig Description U1 Dual LDO Regulator C1,C3 Capacitor C2 Capacitor C4 Capacitor C5 Capacitor R1 Resistor R2,R4 Resistor R3 Resistor R5 Resistor HS1 Heat Sink Rev. 1.9 3/22/ Vout1 6 Vin ...
Page 8
... US1260 TYPICAL APPLICATION TYPICAL APPLICATION RAMBUS APPLICATION 5V U1 US1260 1260app6-1.0 Figure 5- Typical application of US1260 in the Rambus design with the 2.5V output providing for memory termination while 3.3V supplies the on board logic. Notes:Rambus is trade mark of Rambus Corp. Ref Desig Description U1 Dual LDO Regulator C1,C2,C3 Capacitor ...
Page 9
... TYPICAL APPLICATION TYPICAL APPLICATION INTEL I740 GRAPHICS CHIP APPLICATION US1260 1260app8-1.0 Figure 6 - Typical application of US1260 to provide 2.7V from the 3.3V bus for the Intel 740 graphics chip. Ref Desig Description U1 Dual LDO Regulator C1,C3 Capacitor C4 Capacitor C5 Capacitor R4 Resistor R3 Resistor R5 Resistor Rev. 1.9 3/22/99 3. Vout1 U1 6 Vin ...