SMM665B_11 Datasheet, PDF (1/30 Pages) Summit Microelectronics, Inc. – Six-Channel Active DC Output Controller, Monitor, Marginer and Sequencer

SMM665B
Preliminary Information¹ (See Last Page)
Six-Channel Active DC Output Controller, Monitor, Marginer and Sequencer
FEATURES & APPLICATIONS
• Extremely accurate (±0.2%) Active
DC Output Control (ADOC^TM)
• Undervoltage Lockout function (UVLO)
• ADOC^TM Automatically adjusts supply output
voltage level under all DC load conditions
• Monitors, controls, sequences and margins up
to six supplies from 0.3V to 5.5V with 1.25V Vref
ƒ Wide Margin/ADOC range from 0.3V to VDD
• Programmable Power-on/-off sequencing
• Monitors internal temperature sensor
• Operates from any intermediate bus supply
from 8V to 15V and from 2.7V to 5.5V
• Monitors 12V input and VDD
• Monitors two general-purpose 10-bit ADC inputs
• Programmable threshold limits (2 OV/2 UV) for
each monitored input
• Programmable RESET, HEALTHY and FAULT
• 4k-bit general purpose nonvolatile memory
• I²C 2-wire serial bus for programming
configuration and monitoring status, including
10-bit ADC conversion results
Applications
• Monitor/Control Distributed and POL Supplies
• Multi-voltage Processors, DSPs, ASICs used in
Telecom, CompactPCI or server systems
SIMPLIFIED APPLICATIONS DRAWING
INTRODUCTION
The SMM665B is an Active DC Output power supply
Controller (ADOC^TM) 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
device actively controls up to six DC/DC converters
that use 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 SMM665B 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 8V to 15V or
from 5.5V to as low as 2.7V. The part monitors six
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 SMM665B status
register, optionally control Power-on/off, margining and
utilize 4K-bits of nonvolatile memory.
12VIN (+8V to +15V Range)
3.3VIN (+2.7V to +5.5V Range)
I²C
BUS
External
or
Internal
TEMP
SENSOR
Environ
mental
SENSOR
External or
Internal
REFERENCE
SDA
SCL
A2
CAP_A
TRIM_CAP_A
TRIM_A
PUP_A
AIN1
SMM665B
VM_A
CAP_B
AIN2
TRIM_CAP_B
2 of 6 DC-DC
Converters shown
VREF_CNTL
VREF_ADC
TRIM_B
PUP_B
DC/DC
Converter C, E
VIN
DC/DC
Converter A
Vout
TRIM
ON/OFF
12V
3.3V
2.5VIN
DC/DC
Converter D, F
VIN
DC/DC
Converter B
Vout
TRIM
ON/OFF
μP/
ASIC
1.2VIN
VM_B
HEALTHY
RESET
READY
Figure 1 – Applications Schematic using the SMM665B Controller to actively control the output levels of
up to six 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. 2006 • 757 N. Mary Avenue • Sunnyvale CA 94085 • Phone [phone] • FAX [phone]
The Summit Web Site can be accessed by “right” or “left” mouse clicking on the link: http://www.summitmicro.com/
2089 2.1 5/25/2011
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