Selecting Among HIP6004/5, HIP6004A/5A, HIP6004B/5B, and HIP6014/15 Technical Brief July 1998 TB356 Author: Bogdan M. Duduman Introduction All eight part numbers listed above belong to voltage-mode PWM controllers targeted at desktop computer and/or microprocessor applications. These components were designed with emphasis on various Intel and industry requirements, specifically regarding the Pentium II processor and its derivatives. TABLE 2. OUTPUT VOLTAGE PROGRAM AND PGOOD RESPONSE VID PINS LOGIC STATE OUTPUT VOLTAGE (HIP60xx) PGOOD LOGIC STATE (HIP60xx) VID 43210 04 05 04A 05A 04B 05B 14 15 04 05 04A 05A 04B 05B 14 15 Background Details 01111 1.30 0 1.30 0 X 0 X 1 The evolution of these different, yet very similar ICs, was dictated by changes in Intel requirements as well as customer feedback. To ease the system migration to subsequent parts, all the ICs are compatible within their class type. Specifically, all even part numbers (HIP6004/4A/4B/14) represent pin-forpin compatible synchronous buck controllers, while the odd numbers (HIP6005/5A/5B/15) are pin-for-pin compatible standard buck controllers [1-8]. Among the four pairs (4/5, 4A/5A, 4B/5B, and 14/15), however, there are functional subtleties that differentiate them. 01110 1.35 0 1.35 0 X 0 X 1 01101 1.40 0 1.40 0 X 0 X 1 01100 1.45 0 1.45 0 X 0 X 1 01011 1.50 0 1.50 0 X 0 X 1 01010 1.55 0 1.55 0 X 0 X 1 01001 1.60 0 1.60 0 X 0 X 1 01000 1.65 0 1.65 0 X 0 X 1 00111 1.70 0 1.70 0 X 0 X 1 00110 1.75 0 1.75 0 X 0 X 1 00101 1.80 1.80 1.80 1.80 X X X X 00100 1.85 1.85 1.85 1.85 X X X X 00011 1.90 1.90 1.90 1.90 X X X X 00010 1.95 1.95 1.95 1.95 X X X X 00001 2.00 2.00 2.00 2.00 X X X X 00000 2.05 2.05 2.05 2.05 X X X X 11111 2.00 0 0 0 X 0 1 1 11110 2.10 2.10 2.10 2.10 X X X X 11101 2.20 2.20 2.20 2.20 X X X X 11100 2.30 2.30 2.30 2.30 X X X X 11011 2.40 2.40 2.40 2.40 X X X X 11010 2.50 2.50 2.50 2.50 X X X X 11001 2.60 2.60 2.60 2.60 X X X X 11000 2.70 2.70 2.70 2.70 X X X X 10111 2.80 2.80 2.80 2.80 X X X X 10110 2.90 2.90 2.90 2.90 X X X X 10101 3.00 3.00 3.00 3.00 X X X X 10100 3.10 3.10 3.10 3.10 X X X X 10011 3.20 3.20 3.20 3.20 X X X X 10010 3.30 3.30 3.30 3.30 X X X X 10001 3.40 3.40 3.40 3.40 X X X X 10000 3.50 3.50 3.50 3.50 X X X X Functional Differences Reference Voltage DAC All these converters have a 5-bit DAC-controlled internal voltage reference. HIP6004 and HIP6005 have an analog DAC, where the VID inputs connect directly to a resistive internal network. Shorting various VID (voltage identification) inputs to ground changes the reference voltage and the converter's output voltage as a result. The drawback of such architecture is that the VID inputs have to be either open or shorted to ground. Pull-up or pull-down resistors on the VID input lines result in erroneous output voltage settings. HIP6004A/4B/5A/5B/14/15, on the other hand, have fully buffered TTL-compatible VID inputs. Pull-ups to 5V do not affect the output voltage settings (open circuit still regarded as logic `high'). Table 1 summarizes this difference. TABLE 1. REFERENCE VOLTAGE DAC TYPE / PULL-UP COMPATIBILITY 5-BIT DAC 6004/5 TTL-Compatible No Pull-up Resistors Not Allowed 6004A/5A 6004B/05B 6014/15 Yes Yes Yes Allowed Allowed Allowed Output Voltage Program Among the eight part types, there are small differences in the operation of the DAC, as shown in Table 2. While the DAC is, in all cases, programmed to provide the same output voltage for a given VID combination, some controllers have certain voltage settings disabled. 4-124 NOTE: `X' = `0' or `1', depending whether the output voltage is within PGOOD limits http://www.intersil.com or 407-727-9207 | Copyright (c) Intersil Corporation 1999 Pentium(R) is a registered trademark of Intel Corporation. Technical Brief 356 PGOOD Response References During normal converter operation (with the VID combination resulting in an output voltage other than 0V), PGOOD asserts a logic `high' (`1') if the output voltage is within 10% (typical) of the DAC setting (reference). For Intersil documents available on the internet, see web site http://www.intersil.com/ Intersil AnswerFAX (407) 724-7800 In the case of HIP6004A/5A, for VID settings resulting in converter shutdown (0V output voltage), PGOOD will assert a logic `low' (`0'), thus indicating the absence of output voltage. A case that requires special consideration is the dualprocessor system. For these systems, designers use one converter for each processor, "wire AND-ing" the open-drain PGOOD signals from both power converters in order to generate a `System Power Good' signal. However, if these systems ship with only one processor populated (second processor offered as an upgrade), the empty processor slot would generate a `11111' VID code, which in turn would disable the corresponding converter. If this converter were to employ a HIP6004A or HIP6005A, the 0V output voltage setting would generate a PGOOD `low', and consequently cause the System Power Good to go `low', disabling the entire computer system. HIP6004B/5B/14/15 handle this situation by generating a PGOOD `high' for all VID settings that result in a 0V converter output. [1] HIP6004 Data Sheet, Intersil Corporation, AnswerFAX Doc. No. 4275 [2] HIP6005 Data Sheet, Intersil Corporation, AnswerFAX Doc. No. 276 [3] HIP6004A Data Sheet, Intersil Corporation, AnswerFAX Doc. No. 4417 [4] HIP6005A Data Sheet, Intersil Corporation, AnswerFAX Doc. No. 4418 [5] HIP6004B Data Sheet, Intersil Corporation, AnswerFAX Doc. No. 4567 [6] HIP6005B Data Sheet, Intersil Corporation, AnswerFAX Doc. No. 4568 [7] HIP6014 Data Sheet, Intersil Corporation, AnswerFAX Doc. No. 4420 [8] HIP6015 Data Sheet, Intersil Corporation, AnswerFAX Doc. 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