US3004 ETC-unknow, US3004 Datasheet
US3004
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US3004 Summary of contents
Page 1
... Meets Latest VRM 8.4 Specification for PIII Provides Single Chip Solution for Vcore, GTL+ and Clock Supply On board DAC programs the output voltage from 1.3V to 3.5V. The US3004/5 remains on for VID code of (11111). Dual linear regulator controller on board for 1.5V GTL+ and 2.5V clock supplies Loss less Short Circuit Protection ...
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... US3004,US3005 ABSOLUTE MAXIMUM RATINGS ABSOLUTE MAXIMUM RATINGS V5 supply Voltage ........................................... 10V V12 Supply Voltage ............................................ 20V Storage Temperature Range ................................. -65 TO 150 C Operating Junction Temperature Range .......... 0 TO 125 C PACKAGE INFORMATION PACKAGE INFORMATION 20 PIN WIDE BODY PLASTIC SOIC (W) TOP VIEW Lin2 Lin1 2 19 ...
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... Fall Time Dead band Time Oscillator Section Osc Frequency Osc Valley Osc Peak LDO Controller Section Vfb1 & Vfb2 (US3004) Vfb2 (US3005) Vfb1 (US3005) Input bias current Lin1 or Lin2 Drive Current Note 1: Vs refers to the set point voltage given in Table 1. D4 ...
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... D4 This pin selects a range of output voltages for the DAC.When in the LOW state the range is 1.3V to 2.05V. For VID codes of all "1" the US3004 keeps all the outputs on. 6 PGd This pin is an open collector output that switches LO when the output of the converter is not within 10% (typ) of the nominal output voltage ...
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... BLOCK DIAGRAM BLOCK DIAGRAM Enable V12 UVLO V5 Vset D0 D1 5Bit DAC, D2 Ctrl Logic D3 D4 Vfb2 Lin2 Lin1 Vfb1 Figure 1 - Simplified block diagram of the US3004. Rev. 1.2 12/8/00 Vset Enable PWM + Control Slope Enable Comp Osc Soft Over Current Start & Fault Logic Enable 1.5V ...
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... VID4 VID3 VID2 VID1 VID0 Figure 2- Typical application of US3004 or 3005 board DC-DC converter providing the Core , GTL+, and Clock supplies for the Pentium II microprocessor. PART # US3004 US3005 Table2, describing the differences between 3004 and 3005 applications. 4-6 Q1 R16 C7 Q2 ...
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... US3004/5 Application Parts List Q1 MOSFET Q2 MOSFET Q3 Bipolar Trans MOSFET L1 Inductor L2 Inductor C1 Capacitor, Ceramic C2,6 Capacitor, Ceramic C3 Capacitor, Electrolytic C4 Capacitor, Ceramic C5 Capacitor, Ceramic C7,14,15 Capacitor, Ceramic C8 Capacitor, Ceramic C9 Capacitor, Electrolytic C10 Capacitor, Electrolytic C11 Capacitor, Electrolytic C12 Capacitor, Electrolytic C13 Capacitor, Electrolytic C16 ...
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... VID2 VID1 VID0 Figure 3- Typical application of US3004 in a Pentium with AGP where the power dissipation of the 3.3V linear regulator is equally distributed between Q3 and Q4 pass transistors. This equal distribution is possible by accurately regulating the first regulator using the US3004 linear controller and its internal 1% reference voltage while the second controller regulates the output of the first regulator from 4 ...
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... US3004 Application Parts List Ref Desig Description Q1 MOSFET Q2 MOSFET Q3,4 MOSFET L1 Inductor L2 Inductor C1 Capacitor, Ceramic C2,6 Capacitor, Ceramic C3 Capacitor, Electrolytic C4 Capacitor, Ceramic C5 Capacitor, Ceramic C7,14,15 Capacitor, Ceramic C8 Capacitor, Ceramic C9 Capacitor, Electrolytic C10 Capacitor, Electrolytic C11 Capacitor, Electrolytic C12 Capacitor, Electrolytic C13 Capacitor, Electrolytic C16 ...
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... US3004,US3005 Application Information Application Information An example of how to calculate the components for the application circuit is given below. Assuming, two sets of output conditions that this regu- lator must meet, a) Vo=2.8V , Io=14.2A, Vo=185mV, Io=14.2A b) Vo=2V , Io=14.2A, Vo=140mV, Io=14.2A The regulator design will be done such that it meets the worst case requirement of each condition. ...
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... The following heat sinks from AAVID and Thermaloy meet this crite- ria. Co. Thermalloy AAVID US3004/US3005 Part # 6078B 577002 4-11 ...
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... US3004,US3005 Following the same procedure for the Schottcky diode results in a heatsink with C/W. Although it is possible to select a slightly smaller heatsink, for sim- plicity the same heatsink as the one for the high side MOSFET is also selected for the synchronous MOSFET. Switcher Current Limit Protection ...
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... The disadvantage is that the output voltage is not ad- justable anymore. The application circuit given for Pentium II can use either US3004 or US3005 family of parts for maximum flexibility. Disabling the LDO Regulators The LDO controllers can easily be disabled by connect- ing the feedback pins, Vfb1 and Vfb2 to a voltage higher than 2 ...
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... US3004,US3005 Layout Considerations Switching regulators require careful attention to the lay- out of the components, specifically power components since they switch large currents. These switching com- ponents can create large amount of voltage spikes and high frequency harmonics if some of the critical compo- nents are far away from each other and are connected with inductive traces ...