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SMM105

Preliminary Information
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Single-Channel Supply Voltage Marginer and Active DC Output Controller FEATURES & APPLICATIONS INTRODUCTION

Extremely accurate (±0.1%) Active DC Output Control (ADOC

TM 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 (ADOC

)

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
TM ) 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 I Wide Margin/ADOC range from 0.3V to VDD Uses either an internal or external VREF Operates from any intermediate bus supply from 8V to 15V and from 2.7V to 5.5V
2 C 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. 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 I
2 C 2-wire serial bus for programming configuration and monitoring status. The voltage settings (margin high/low and nominal) are programmed into nonvolatile memory through the industry standard I
2 2 28 pad QFN or 25 ball Ultra CSP
TM (Chip-Scale) package C 2-wire data bus. The I C 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.

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) WP# VDD12VIN SDASCL FILT_CAPTRIM_CAP VINTRIMV+V- DC/DCConverterTRIMVMON/OFF I 2 CBUS A2A1 A0 VDD_CAP VM uP/DSP/FPGA/ASIC

SMM105

UVOVGND Internal orExternalVoltageReference VREF_CNTL GND1.2 VIN FAULT#COMP1COMP2 FAULT# POWER GOOD READY START READY 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. 2006 • 757 North Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266 http://www.summitmicro.com 2068 1.9 06/15/06 1