SMB211/212

Preliminary Information

http://www.summitmicro.com/

2139

2.2 1/17/2011

1

Programmable Power Managers with Digital Power Control

Features



Digital Power Control via 2-wire serial interface and non-

volatile memory



Current-mode control



Input voltage range: +4.5V to +13.5V



More than 15A output current



Output voltage accuracy:

1.0%



Static or dynamically programmable output voltage

o

+0.5V to +2.5V, 10mV steps

o

+1V to +5.0V, 20mV steps



Cycle-by-cycle current limit



Output voltage margining



Output UV/OV monitoring



Internal over-temperature protection



PWM or PFM operation



Programmable system power control

o

Digital soft-start control

o

Power-on delay

o

Switching frequency

o

PGOOD/RESET/SMB_ALERT output

o

Enable/disable control

o

Serial-interface slave addresses

o

Output voltage

Applications



Printers



Digital Set-Top Boxes



Digital TVs



Modems



Datacom/Telecom Equipment



Servers

The SMB211/212 are highly integrated and flexible power manager

designed for use in a wide range of applications from printers and set-

top boxes to servers and network equipment. The built-in non-volatile

digital programmability allows system designers to custom tailor the

device to suit almost any power supply application.

The SMB211/212 feature a synchronous high current step-down “buck”

controller that can provide an output current of more than 15A. They

can operate with an input voltage of +4.5V to +13.5V and provide

programmable output voltages that are typically accurate to 1.0%. The

SMB211 is available with a switching frequency of 250, 500, 750 and

1000kHz, while the SMB212 is available with a switching frequency of

250, 375, 500 and 625kHz.

Additional sophisticated power control/monitoring functions required by

complex systems are built-in and programmed via an industry-standard

2-wire serial interface. These include digitally programmable output

voltage set-point and margining, power-on delay, soft-start, switching

frequency and UV/OV output voltage monitoring.

The integration of features and built-in flexibility of the SMB211/212

allows the system designer to create a “platform solution” that can be

easily modified via software without major hardware changes. This

facilitates rapid design cycles and proliferation from a base design to

future generations of product.

Communication is accomplished via an industry standard 2-wire serial

bus. All non-volatile programmed settings are stored in non-volatile

memory and reset during power-up. The operating temperature range

is –30C to +85C and the available package is a 3mm x 3mm QFN-20.

SYSTEM APPLICATION

FEATURES & APPLICATIONS

INTRODUCTION

SMB211/212

I2C/SMBus

(PMBus)

System

Control

and

Monitoring

Status/Alert Outputs

EN/Control Input

+4.5V to +13.5V

VIN

Step-Down

ext. FET

0.5V-5V (Prog.)

20A+

ASIC/CPU/

SoC

Figure 1 – Typical SMB211/212 System Diagram