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SMM105NECR00 데이터시트(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMM105NECR00 데이터시트(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 21 page SMM105 Preliminary Information Summit Microelectronics, Inc 2068 1.8 09/20/05 2 GENERAL DESCRIPTION The SMM105 is capable of controlling and margining the DC output voltage of LDOs or DC/DC converters that use a trim/adjust pin and to automatically change the level using a unique Active DC Output Control (ADOC TM). The ADOC function is programmable over a standard 2-wire I 2C serial data interface and can be used to set the nominal DC output voltage as well as the margin high and low settings. The part actively controls the programmed set levels to maintain tight control over load variations and voltage drops at the point of load. The margin range will vary depending on the supply manufacturer and model but the normal range is 10% adjustment around the nominal output setting. However, the SMM105 has the capability to margin from VREF_CNTL to VDD. The user can set the desired voltage settings (nominal, margin high and margin low) into the EE memory array for the device. Then, volatile registers are used to select one of these settings. The registers are accessed over the I 2C bus. In normal operation, Active DC Output Control is set to adjust the nominal output voltage of the converter. Typical converters have ±2% accuracy ratings for their output voltage. Using the Active DC Output Control feature of the SMM105 can increase the accuracy to ±0.1%. This high accuracy control of the converter output voltage is extremely important in low voltage applications where deviations in power supply voltage can result in lower system performance. Active DC Output Control can also be used for margining a supply during system test or may be turned off by de- selecting the function in the Control Select Register. The margin high and margin low voltage settings can range from 0.3V to VDD around the converters’ nominal output voltage setting depending on the specified margin range of the DC-DC converter. When the SMM105 receives the command to margin, the Active DC Output Control will adjust the supply to the selected margin voltage. Once the supply has reached its margined set point, the Ready bit in the status register will set and the READY pin will go active. If Active DC Control is disabled, a margined supply can return to its nominal voltage by writing to the margin command register. In order to obtain maximum accuracy, the SMM105 requires an external voltage reference. An external reference with ±0.1% accuracy will enable an overall ±0.2% accuracy for the device. A configuration option also exists so that an internal voltage reference can be used, but with less accuracy. Total accuracy using the internal reference is ±0.5%. The SMM105 can be powered from either a 12V or 8V input via an internal regulator or the VDD input (Figure 3). The SMM105 has two additional input pins and one additional output pin. The input pins, COMP1 and COMP2, are high impedance inputs, each connected to a comparator and compared against the VREF_CNTL input or the internal reference (VREF). Each comparator can be independently programmed to monitor for UV or OV. When either of the COMP1 or COMP2 inputs are in fault the open-drain FAULT# output will be pulled low. A configuration option exists to disable the FAULT# output during margining. Programming of the SMM105 is performed over the industry standard I 2C 2-wire serial data interface. A status register is available to read the state of the part and a Write Protect (WP#) pin is available to prevent writing to the configuration registers and EE memory. Figure 2 – Example Power Supply Margining using the SMM105. The waveform on the left is margin low to high from 1.6V to 2.0V and the waveform on the right is margin high to nominal from 2.0V to 1.8V. The ADOC function guarantees the output level to be within ±0.2% with a ±0.1% external reference. The bottom waveform is the READY signal indicating margin is complete. |
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