SMM205

• Extremely accurate (±0.1%) Active DC Output Control (ADOC)
• ADOC Automatically adjusts supply output voltage level under all 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
• 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 lead QFN package

Temperature Under Bias ......................................................................55°C to 125°C
Storage Temperature............................................................................65°C to 150°C
Terminal Voltage with Respect to GND:
            VDD Supply Voltage .....................................................................0.3V to 6.0V
            12VIN Supply Voltage.................................................................0.3V to 15.0V
            All Others .......................................................................... 0.3V to V_DD + 0.7V
Output Short Circuit Current ............................................................................. 100mA
Lead Solder Temperature (10 secs)..........................................................300°C
Junction Temperature.......................................................................................150°C
ESD Rating per JEDEC.............................................................................2000V
Latch-Up testing per JEDEC........................................................................±100mA

The SMM205 actively controls the output voltage level of two DC/DC converters that use a Trim or VADJ/FB pin to adjust the output. An Active DC Output Control (ADOC) 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 SMM205 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 SMM205 checks 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 SMM205 ADOC continues to monitor and adjust the channel output at the specified level.