SMM665C

© SUMMIT

2125 3.2 5/24/2011

1

Six-Channel Active DC Output Controller, Monitor, Marginer and Sequencer

FEATURES & APPLICATIONS

• Extremely accurate (±0.2%) Active

DC Output Control (ADOC

• Undervoltage Lockout function (UVLO)

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

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

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

INTRODUCTION

The SMM665C is an Active DC Output power supply

Controller (ADOC

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 I

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 SMM665C 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 I

system can communicate with the SMM665C status

register, optionally control Power-on/off, margining and

utilize 4K-bits of nonvolatile memory.

SIMPLIFIED APPLICATIONS DRAWING

TRIM

B

PUP

B

VM

B

TRIM_CAP

B

CAP

B

TRIM

A

PUP

A

VM

A

TRIM_CAP

A

CAP

A

SMM665C

μP/

ASIC

3.3VIN (+2.7V to +5.5V Range)

RESET

READY

HEALTHY

12VIN (+8V to +15V Range)

External

or

Internal

TEMP

SENSOR

AIN1

VREF_ADC

2.5VIN

1.2VIN

12V

SDA

SCL

BUS

3.3V

A2

VREF_CNTL

VIN

TRIM

Vout

DC/DC

Converter A

ON/OFF

VIN

TRIM

Vout

DC/DC

Converter B

ON/OFF

External or

Internal

REFERENCE

Environ

mental

SENSOR

AIN2

DC/DC

Converter C, E

DC/DC

Converter D, F

2 of 6 DC-DC

Converters shown

Figure 1 – Applications Schematic using the SMM665C 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.