SMM766
Preliminary Information 1 (See Last Page)
Six-Channel Active DC Output Controller, Monitor, Marginer and Sequencer with Sequence-Link
FEATURES & APPLICATIONS
INTRODUCTION
The SMM766 is an Active DC Output power supply
Controller (ADOCTM) that monitors, margins, and
cascade sequences. The ADOC feature is unique and
maintains extremely accurate settings of system
supply voltages to within ±0.2% under full load. The
SMM766 actively controls up to 6 DC/DC converters
and can be linked with up to 7 other Sequence-Link™
devices to accommodate sequencing of up to 48
channels. Control of the DC-DC converters is
accomplished through the use of a Trim or Regulator
VADJ/FB pin to adjust the output voltage. For system
test, the part also controls margining of the supplies
using I2C commands. It can margin supplies with
either positive or negative control within a range of
0.3V to VDD, depending on the specified range of the
converter. The SMM766 also intelligently sequences
or cascades the power supplies on and off in any
order using enable outputs with programmable
polarity. It can operate off any intermediate bus supply
ranging from 6V to 14V or from 5.5V to as low as 2.7V.
The part monitors 6 power supply channels as well as
VDD, 12V input, two general-purpose analog inputs
and an internal temperature sensor using a 10-bit
ADC. The 10-bit ADC can measure the value on any
one of the monitor channels and output the data via
the I2C bus. A host system can communicate with the
SMM766 status register, margining and utilize 2K-bits
of nonvolatile memory.
• Extremely accurate (±0.2%) Active
DC Output Control (ADOC™)
• Sequence-Link™ provides sequencing of up to
48 channels
• ADOC automatically adjusts supply output
voltage level under all DC load conditions
• Monitors, controls, and margins up to 6
supplies from 0.3V to 5.5V with 1.25V Vref
• Programmable power-on/-off sequencing
• Operates from any intermediate bus supply
from 6V to 14V and from 2.7V to 5.5V
• Monitors 12V input VDD and temperature sensor
• Wide margin/ADOC range from 0.3V to VDD
• Monitors two general-purpose 10-bit ADC inputs
• I2C 2-wire serial bus for programming
configuration and monitoring status, including
10-bit ADC conversion results
• 2 programmable Under Voltage (UV) and Over
Voltage (OV) threshold limits for each of 11
monitored inputs
• 2k-bit general purpose nonvolatile memory
Applications
• Monitor/control distributed and POL supplies
• Multi-voltage processors, DSPs, ASICSs used in
telecom, CompactPCI or server systems
SIMPLIFIED APPLICATIONS DRAWING
12V
3.3V
12VIN (+6V to +14V Range)
3.3VIN (+2.7V to +5.5V Range)
DC/DC
Converter C, E
CAPA
TRIM_CAPA
VIN
SDA
SCL
A2
DC/DC
I2C
Converter A
2.5VIN
Vout
BUS
TRIM
TRIMA
PUPA
ON/OFF
2 of 6 DC-DC
SEQ_LINK
Converters shown
External
or
VMA
SMM766
DC/DC
µP/
Internal
TEMP
AIN1
Converter D, F
CAPB
TRIM_CAPB
ASIC
VIN
SENSOR
DC/DC
Converter B
1.2VIN
Vout
Environmental
SENSOR
AIN2
TRIMB
PUPB
TRIM
ON/OFF
VREF
External or
Internal
VMB
REFERENCE
RESET#
HEALTHY
Figure 1 – Applications schematic using the SMM766 controller to actively control theRoEuADtYput levels of up
to 6 DC/DC converters while also providing power-on/off, cascade sequencing and output margining.
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT Microelectronics, Inc. 2004 • 1717 Fox Drive • San Jose CA 95131 • Phone 408 436-9890 • FAX 408 436-9897
The Summit Web Site can be accessed by “right” or “left” mouse clicking on the link: http://www.summitmicro.com/
2086 2.1 12/13/2005
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