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SMM105 Dataheets PDF



Part Number SMM105
Manufacturers Summit Microelectronics
Logo Summit Microelectronics
Description Single-Channel Supply Voltage Marginer and Active DC Output Controller
Datasheet SMM105 DatasheetSMM105 Datasheet (PDF)

SMM105 Preliminary Information 1 (See Last Page) Single-Channel Supply Voltage Marginer and Active DC Output Controller FEATURES & APPLICATIONS • ADOC Automatically adjusts supply output voltage level under all DC load conditions • Capable of margining supplies with trim inputs using either positive or negative trim pin control • Wide Margin/ADOC range from 0.3V to VDD • Uses either an internal or external VREF www.DataSheet4U.com • Operates from any intermediate bus supply from 8V to 15V and f.

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SMM105 Preliminary Information 1 (See Last Page) Single-Channel Supply Voltage Marginer and Active DC Output Controller FEATURES & APPLICATIONS • ADOC Automatically adjusts supply output voltage level under all DC load conditions • Capable of margining supplies with trim inputs using either positive or negative trim pin control • Wide Margin/ADOC range from 0.3V to VDD • Uses either an internal or external VREF www.DataSheet4U.com • Operates from any intermediate bus supply from 8V to 15V and from 2.7V to 5.5V • Programmable START and READY pins • Two programmable general purpose monitor sensors – UV and OV with FAULT Output Flag • General Purpose 1k EEPROM with Write Protect • I2C 2-wire serial bus for programming configuration and monitoring status. • 28 pad QFN or 25 ball Ultra CSPTM (Chip-Scale) package INTRODUCTION The SMM105 actively controls the output voltage level of a DC/DC converter that uses a Trim or VADJ/FB pin to adjust the output. An Active DC Output Control (ADOCTM) feature is used during normal operation to maintain extremely accurate settings of supply voltages and, during system test, to control margining of the supplies using I2C commands. Total accuracy with a ±0.1% external reference is ±0.2%, and ±0.5% using the internal reference. The device can margin supplies with either positive or negative trim pin control within a range of 0.3V to VDD. The SMM105 supply can be from 12V, 8V, 5V or 3.3V to as low as 2.7V to accommodate any intermediate bus supply. The voltage settings (margin high/low and nominal) are programmed into nonvolatile memory through the industry standard I2C 2-wire data bus. The I2C bus is also used to enable margin high, margin low, ADOC or normal operation. When margining, the SMM105 will check the voltage output of the converter and make adjustments to the trim pin via a feedback loop to bring the voltage to the margin setting. A margining status register is set to indicate that the system is ready for test. The SMM105 ADOC will continue to monitor and adjust the channel output at the specified level. • Extremely accurate (±0.1%) Active DC Output Control (ADOCTM) Applications • In-system test and control of Point-of-Load (POL) Power Supplies for Multi-voltage Processors, DSPs and ASICs • Enterprise and edge routers, servers, Storage Area Networks SIMPLIFIED APPLICATIONS DRAWING 12VIN (6V to 15V) 3.3/5Vin (2.7V to 5.5V) 12VIN WP# SDA I2C BUS SCL A2 A1 A0 VDD_CAP VM COMP1 OV uP/ DSP/ FPGA/ ASIC TRIM VDD TRIM_CAP FILT_CAP VIN DC/DC Converter TRIM ON/OFF V+ V1.2 VIN GND SMM105 Internal or External Voltage Reference COMP2 VREF_CNTL READY START GND FAULT# UV FAULT# READY POWER GOOD Figure 1 – Applications Schematic using the SMM105 Controller to actively control the DC output level (ADOC) of a DC/DC Converter as well as margin control. The SMM105 can operate over a wide supply range Note: This is an applications example only. Some pins, components and values are not shown. © SUMMIT Microelectronics, Inc. 2005 • 1717 Fox Drive • San Jose CA 95131 • Phone 408 436-9890 • FAX 408 436-9897 2068 1.8 09/20/05 www.summitmicro.com 1 SMM105 Preliminary Information www.DataSheet4U.com 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. 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 (ADOCTM). The ADOC function is programmable over a standard 2-wire I2C 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 I2C 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 .


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