SMM605

Preliminary Information

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www.summitmicro.com

2064 1.1 9/16/03

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FEATURES & APPLICATIONS

• Extremely accurate (±0.1% Typ.) Active

• 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 8V to 15V and from 2.7V to 5.5V

• Programmable START and READY pins

• General Purpose 4k EEPROM with Write Protect

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

INTRODUCTION

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

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

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

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

TRIM

B

VM

B

TRIM_CAP

B

CAP

B

TRIM

A

VM

A

TRIM_CAP

A

CAP

A

SMM605

µP/

ASIC

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

RESET

READY

HEALTHY

12VIN (+6V to +14V Range)

2.5VIN

1.2VIN

12V

SDA

SCL

BUS

3.3V

A2

VREF_CNTL

VIN

TRIM

Vout

DC/DC

Converter A

VIN

TRIM

Vout

DC/DC

Converter B

External or

Internal

REFERENCE

DC/DC

Converter C, E

DC/DC

Converter D, F

2 of 6 DC-DC

Converters shown

POWER GOOD

VDD_CAP

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.