LXM1700A-xx

 `GUARANTEED 14.0A OUTPUT
` TOTAL OUTPUT TOLERANCE OF LESS THAN ±5% - Includes: Line & load regulation, temperature stability, initial accuracy, load transient and ripple & noise.
`ADJUSTABLE OUTPUT VOLTAGE USING A FIVE-BIT WORD (See Table 1)
`OVER-VOLTAGE DETECTION CROWBARS THE OUTPUT VOLTAGE IN THE EVENT OF PASS TRANSISTOR FAILURE - 100% POCESSOR PROTECTION (LXM1700-xx)
`HIGH EFFICIENCY - 85% (TYP.)
` POWER GOOD SIGNAL INDICATES LOW OUTPUT VOLTAGE
` SOFT-START ELIMINATES TURN-ON  OVERSHOOT
` SHORT-CIRCUIT PROTECTION
` OUTPUT ENABLE /SHUTDOWN

The LXM1700/LXM1700A-xx series of DC/DC converters are Voltage Regulator Modules (VRM) which are specifically designed to meet or exceed the Intel VRM8.1 DC/DC Converter electrical specification as well as its mechanical outline. The LXM1700-xx/1700A-xx is guaranteed to deliver a maximum current of at least 14A. These converters maintain a total tolerance of ±5% maximum, which includes load and line regulation, temperature stability, inital accuracy, load transient and ripple and noise. One of the main features of these converters is their ability to program the output voltage from 1.8 to 3.5V using a 5-bit word from the processors, providing autom atic voltage adjustment for each individual processor. Other features include high efficiency, short-circuit protection, over-voltage protection (LXM1700-xx only), under-voltage detection, soft start and logic level output enable functions.

The LXM1700-05/LXM1700A-xx powers the processor using the 5V supply as the input power and 12V for the control bias. The LXM1700-12/1700A-12 powers the processor using only the 12V supply and does not need a separate voltage for the control bias (see Block Diagram below). The +5V or the +12V input configuration is factory set via simple jumper connections. The LXM1700-12/1700A-12 is primarily used for multiple processor applications, such as quad processor servers, where 5V supplies may not have the needed current capability.