SMB119

© SUMMIT Microelectronics, Inc. 2006

757 North Mary Avenue • Sunnyvale CA 94085 • Phone 408 523-1000 • FAX 408 523-1266

1

http://www.summitmicro.com/

2126 3.0 10/8/2008

Seven-Channel Programmable DC-DC Power Manager

INTRODUCTION

and non-volatile memory

o

Output voltage setpoint/margining

o

Sequencing & digital soft start

o

Enable/Disable outputs independently

o

Input/Output UV/OV voltage thresholds

o

PWM/PFM mode

• Seven programmable regulator channels with 1.5% accuracy

o

Three synchronous step-down (buck) with internal

PFETs

o

Two step-up (boost)

o

One configurable step-up (boost) or step-down (buck)

o

One adjustable output voltage LDO

• +2.7V to +6.0V Input Range (Higher system voltages supported)

• Built-in current limiting, UV/OV, and thermal protection

• Highly accurate reference and output voltage (<1.5%)

• 1MHz PWM frequency and automatic power-saving PFM mode

Applications

• Portable Equipment

The SMB119 is a highly integrated and flexible seven-channel power

manager designed for use in a wide range of portable applications.

The built-in digital programmability allows system designers to custom

tailor the device to suit almost any multi-channel power supply

application from digital camcorders to mobile phones.

The SMB119 integrates all the essential blocks required to implement

a complete seven-channel power subsystem including three

synchronous step-down “buck” converters, one configurable step-up

“boost” or step-down synchronous “buck” converter, two step-up

(boost) converters, and one linear regulator (LDO).

Additionally sophisticated power control/monitoring functions required

by complex systems are built-in. These include digitally programmable

output voltage setpoint, power-up/down sequencing, enable/disable,

margining, dynamic voltage management, and UV/OV input/output

monitoring on all channels. By incorporating a second ENABLE input

and 7-level dynamic voltage control, the SMB119 is ideal for powering

systems based on Xscale™ and other similar processors.

The integration of features and built-in flexibility of the SMB119 allows

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

modified via software without major hardware changes. Combined

with the re-programmability of the SMB119, this facilitates rapid design

cycles and proliferation from a base design to futures generations of

product.

The SMB119 is suited to battery-powered applications with an input

range of +2.7V to +6.0V and provides a very accurate voltage

regulation (<1.5%). Communication is accomplished via the industry

standard I

volatile EEPROM of which 96 bytes may be used for general-purpose

memory applications. The commercial operating temperature range is

0C to +70C, the industrial operating range is –40C to +85C, and the

available package is a 48-pad 7mm x 7mm QFN.

Figure 1 – Applications block diagram featuring the SMB119 seven-channel, programmable DC/DC converter. This integrated power

supply provides precision regulation, monitoring, cascade sequencing, and dynamic output voltage management.

SIMPLIFIED APPLICATIONS DRAWING

FEATURES & APPLICATIONS

SMB119

+0.5V to Vin (Prog.)

Analog/RF

+1.5V to +3.75V

MCU/RTC

LDO

3 Step-

Down

Channels

System

Control

and

Monitoring

Status Outputs

Shutdown

+0.5V to +35V (Prog.)

Memory, I/O

+0.5V to Vin (Prog.)

CPU Core

+0.5V to Vin (Prog.)

DSP/CODEC

Step-Up or

Step-Down

Channel

+2.7V to +6.0V

DC IN

Control Inputs

Pushbutton Power

2 Step-Up

Channels

Vin to +35V (Prog.)

LED

Backlight

Vin to +35V (Prog.)

TFT-LCD

Bias

System Enable