SMM605
Preliminary Information
1
(See Last Page)
Six-Channel Supply Voltage Marginer and Active DC Output Controller (ADOC
TM
)
INTRODUCTION
FEATURES & APPLICATION
•
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
•
I
2
C 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
I
2
C 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 I
2
C 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)
12VIN
VDD
DC/DC
Converter C, E
TRIM_CAP
A
VIN
DC/DC
Converter A
Vout
TRIM
12V
3.3V
SDA
I
2
C
BUS
SCL
A2
2.5VIN
TRIM
A
VDD_CAP
2 of 6 DC-DC
Converters shown
SMM605
VM
A
DC/DC
Converter D, F
VIN
DC/DC
Converter B
Vout
TRIM
TRIM_CAP
B
μP/
ASIC
1.2VIN
External or
Internal
REFERENCE
VREF_CNTL
TRIM
B
START
READY
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 •
Phone 408 523-1000 • FAX 408 523-1266
http://www.summitmicro.com
2064 2.1 12/16/2011
1
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
