SMM151/152

Preliminary Datasheet

© SUMMIT Microelectronics, Inc. 2007 • 757 N. Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266

http://www.summitmicro.com/

2131 2.1 8/15/2008

1

Single-channel Voltage/Current Monitors and Voltage Marginers

INTRODUCTION

• Capable of margining supplies with trim inputs using

either positive or negative trim pin control

• Wide Margin range of 0.3V to VDD with internal

reference

• Differential Voltage Sensing of the DC-DC converter

output voltage

• Supply-side current monitoring (10-bit ADC)

• Margining Controlled Via:

I

• Two programmable general purpose sensor inputs

(COMP1/2) – UV/OV with FAULT Output

• Programmable glitch filters (COMP1/2)

• Programmable internal COMP1/2 VREF: 0.5V or 1.25V

• Operates from 2.7V to 5.5V supply

• Current sensing from 4.0V to 15V supply

• Programmable, general purpose I/Os (SMM152)

• General Purpose 256-Byte EEPROM with Write Protect

monitoring status

• 28-lead 5x5 QFN

Applications

•

In-system test and control of Point-of-Load (POL)

•

Power Supplies for Multi-voltage Processors, DSPs

and ASICs

•

Routers, Servers, Storage Area Networks

The

SMM151/152

are

highly

accurate

power

supply

voltage/current supervisors and monitors with provisions for

voltage margining of the monitored supply. The parts include

an internal voltage reference to accurately monitor and margin

the supply to within ±1%. The SMM151/152 have the capability

to margin over a wide range from 0.3V to VDD using the

internal reference and can read the differential voltage of the

supply and voltage drop of the current sense resistor over the

I

using the I

I

programmed

margin

target

voltage

is

reached,

the

SMM151/152 hold the converter at this voltage until receiving

an I

the SMM151/152 are not margining, the TRIM output pin is

held in a high impedance state allowing the converter to

operate at its nominal set point.

Two general purpose input pins are provided for sensing under

or over-voltage conditions. A programmable glitch filter

associated with these inputs allows the user to ignore spurious

noise signals. A FAULT# pin is asserted once either input set

point is exceeded. The SMM152 also provides four

programmable general-purpose inputs/outputs.

Using the I

the SMM151/152 status register and utilize 256-bytes of

nonvolatile memory.

TYPICAL APPLICATION

FEATURES & APPLICATIONS

VM+

TRIM

TRIM

VOUT+

SEN+

DC-DC Converter

VDD

WP

A0-A2

COMP1

COMP2

SCL

SDA

FAULT#

CAPM+

MUP

MDN

Interface

Margin

Commands

V1

2.7V-5.5V

SMM151

(SMM152)

READY

GND

VDD_CAP

Status

Outputs

VOUT-

SEN-

VM-

4.0V-15V

VIN

CS-

CS+

R

S

VREF

CAPM-

CAPC

(GPIO0)

(GPIO1)

(GPIO2)

(GPIO3)

Figure 1 – Application with the SMM151/152 used to Monitor and Margin a DC/DC Converter.

Note: This is an applications example only. Some components and values are not shown.