Summit SMB111 Technical data

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SMB111

Preliminary Information

Four Channel Programmable DC-DC System Power Manager

FEATURES & APPLICATIONS

• Digital programming of all major parameters via I2C
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 UV/OV monitoring of all outputs
o Enable/Disable outputs independently

• Four output channels

o Three synchronous step-down (buck)

channels

o One step-up (boost) channel

• User friendly Graphical User Interface (GUI)

• +2.7V to +6.0V Input range

• Highly accurate output voltage (<0.5%) with Active DC

Output Control (ADOC™) technology

• Undervoltage Lockout (UVLO) with hysteresis

• 800 kHz operating frequency

• 96 bytes of user configurable nonvolatile memory

Applications

• Digital camcorders/still cameras

• Portable DVD/MP3/GPS

• Camera/smart phones

• TFT/LCD Displays/Monitors/TV’s

• Mobile Computing/PDA’s

• Consumer battery-operated equipment

SIMPLIFIED APPLICATIONS DRAWING

SMB111

+2.7V to +6.0V

or

Li-Ion

Step-Up

(Boost)

Channel

Vin to +30V (Prog.) @ UP TO 1A

INTRODUCTION

The SMB111 is a highly integrated and flexible four-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 multi­channel 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 SMB111 integrates all the essential blocks required to
implement a complete four-channel power subsystem including
three synchronous step-down “buck” controllers and one step­up “boost” controller. 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,
margining and UV/OV/input/output monitoring on all channels.

The integration of features and built-in flexibility of the SMB111
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
SMB111 this facilitates rapid design cycles and proliferation
from a base design to future generations of product.

The SMB111 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 operating temperature range is 0C to +70C
and the available package is a lead-free, Green, RoHS
compliant, 32-pad QFN-32.

LED Drive

2

C bus. All user-

I2C/SMBus

Reset Input

Reset Output

Power Good

System

Control and

Monitoring

3 Step-

Down

(Buck)

Channels

+0.8V to 0.9 x Vin (Prog.) @ 2A

+0.8V to 0.9 x Vin (Prog.) @ 2A

+0.8V to 0.9 x Vin (Prog.) @ 2A

CPU Core

Memory, I/O

DSP/Codec

Figure 1: Applications schematic featuring the SMB111 four-channel, programmable DC-DC controller

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

© SUMMIT Microelectronics, Inc. 2005 1717 Fox Drive • San Jose CA 95131 Phone [phone] • FAX [phone]

http://www.summitmicro.com/

2100 2.3 5/3/2005 1