SMB120

Preliminary information

http://www.summitmicro.com/

2090 2.3 11/15/2005

1

Nine-Channel DC/DC Digitally Programmable System Power Manager

INTRODUCTION

interface and non-volatile memory

o

Output voltage set point

o

Output power-up/down sequencing

o

Digital soft-start and output slew rate

o

Input/battery voltage monitoring

o

Dynamic Voltage Management

o

UV/OV monitoring of all outputs

o

Enable/disable outputs independently

• Nine output channels

o

Four synchronous step-down (buck)

channels

o

Three step-up (boost) channels

o

One inverting (buck-boost) channel

o

One 3.3V fixed LDO channel

• User friendly Graphical User Interface (GUI)

• 2.7V to 6.0V Input Range

• Highly accurate reference and output voltage (<0.5%)

with Active DC Output Control (ADOC™) technology

• Undervoltage Lockout (UVLO) with hysteresis

• 800 kHz operating frequency (trimmable)

• 96 bytes of user configurable nonvolatile memory

• Eight Phase PWM with Phase Locked Loop (PLL)

• 100% Maximum Duty Cycle for Buck channels

• 0% Duty Cycle option for boost and buck-boost

channels

Applications

• Digital camcorders/still cameras

• Portable DVD/MP3/GPS

• Camera phones

• TFT/LCD Displays/Monitors/TV’s

• Mobile Computing

• Consumer battery-operated equipment

•

The SMB120 is a highly integrated and flexible nine-channel

programmable 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.

Complete with a user friendly GUI, all programmable settings

including output voltages and input/output voltage monitoring

can be customized with ease.

The SMB120 integrates all the essential blocks required to

implement a complete nine-channel power subsystem

including four synchronous step-down “buck” controllers, three

step-up

“boost”

controllers,

one

inverting

“buck-boost”

controller, and one linear regulator (LDO).

Additionally

sophisticated power control/monitoring functions required by

complex systems are built-in.

These include digitally

programmable output voltage set point, power-up/down

sequencing, enable/disable, dynamic voltage management and

UV/OV/input monitoring on all channels.

The integration of features and built-in flexibility of the SMB120

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

SMB120 this facilitates rapid design cycles and proliferation

from a base design to future generations of product.

The SMB120 is suited to battery-powered applications with an

input range of 2.7V to 6.0V. Output voltages are extremely

accurate (<0.5%) employing proprietary ADOC™ technology.

Communication is via the industry standard I

programmed settings are stored in non-volatile EEPROM of

which 96 bytes may be used for general-purpose memory

applications. The commercial operating temperature range is

0

°C to +70°C and the industrial temperature range is –40°C to

+85

°C The SMB120 is available in a lead-free, RoHS

compliant 9mm x 9mm 64 pin QFN package.

SIMPLIFIED APPLICATIONS DRAWING

FEATURES & APPLICATIONS

Figure 1 – Applications schematic featuring the SMB120 Nine-Channel DC-DC Digitally Programmable Power Manager.

This DC/DC controller provides power-on/off control, sequencing, fault monitoring, and Dynamic Voltage Management.

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

SMB120

+0.8V to Vin (Prog.)

+0.8V to Vin (Prog.)

-0.8V to -23V(Prog.)

Vin to +28V (Prog.)

+2.7V to +6.0V

or

Li-Ion

CPU Core

Analog/RF

LED Drive

CCD

+3.3V

MCU/RTC

I2C/SMBus

LDO

4 Step-

Down

(Buck)

Channels

3 Step-Up

(Boost)

Channels

Inverter

Channel

System

Control and

Monitoring

Reset Output

Power Good

Reset Input

Vin to +28V (Prog.)

TFT/LCD

Vin to +28V (Prog.)

Motor Drive

+0.8V to Vin (Prog.)

Memory, I/O

+0.8V to Vin (Prog.)

DSP/Codec