SMM605_11 Datasheet, PDF (1/24 Pages) Summit Microelectronics, Inc. – Six-Channel Supply Voltage Marginer and Active DC Output Controller (ADOCTM)

SMM605
Preliminary Information¹ (See Last Page)
Six-Channel Supply Voltage Marginer and Active DC Output Controller (ADOC^TM)
FEATURES & APPLICATION
INTRODUCTION
• Extremely accurate (0.2%, typ.) Active DC Output
Control
• Six-channel control of DC/DC converters
• 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 0.35V to VDD
• Uses either an internal or external VREF
• Operates from any intermediate bus supply
from 6V to 14V and VDD from 2.7V to 5.5V
• Programmable START and READY pins
• General Purpose 4k EEPROM with Write Protect
• I²C 2-wire serial bus for programming
configuration and monitoring status.
• 48-lead TQFP package
Applications
• Monitor/Control Distributed and POL Supplies
• Multi-voltage Processors, DSPs, ASICs used in
Telecom, CompactPCI or server systems
The SMM605 actively controls the output voltage level
of up to six DC/DC converters that use a ‘Trim’ or
‘VADJ/FB’ pin to adjust the output. An Active DC
Output Control (ADOC^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 the industry standard
I²C 2-wire data bus 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 0.35V to VDD. The SMM605 supply can range
from 2.7V to 5.5V or 6V to 14V to accommodate any
intermediate bus supply.
The voltage settings (margin high/low and nominal) are
programmed into nonvolatile memory. The I²C bus is
used to enable margin high, margin low, ADOC or
normal operation. When margining, the SMM605 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.
SIMPLIFIED APPLICATIONS DRAWING
12VIN (+6V to +14V Range)
3.3VIN (+2.7V to +5.5V Range)
I²C
BUS
External or
Internal
REFERENCE
SDA
SCL
A2
TRIM_CAP_A
TRIM_A
VDD_CAP
2 of 6 DC-DC
Converters shown
SMM605 ^VMA
TRIM_CAP_B
VREF_CNTL
TRIM_B
DC/DC
Converter C, E
VIN
DC/DC
Converter A
Vout
TRIM
12V
3.3V
2.5VIN
DC/DC
Converter D, F
VIN
DC/DC
Converter B
Vout
TRIM
μP/
ASIC
1.2VIN
VM_B
POWER GOOD
READY
Figure 1 – Applications Schematic using the SMM605 Controller to actively control and margin the output
levels of up to six DC/DC Converters.
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT Microelectronics, Inc. 2003
• 757 N. Mary Avenue • Sunnyvale CA 94085 •
http://www.summitmicro.com
2064 2.1 12/16/2011
Phone [phone] • FAX [phone]
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