SMB112

Preliminary Information

© SUMMIT Microelectronics, Inc. 2005

1717 Fox Drive • San Jose CA 95131

Phone 408 436-9890 • FAX 408 436-9897

http://www.summitmicro.com/

2101 2.4 5/3/2005

1

INTRODUCTION

interface and non-volatile memory

o Output voltage set-point

o Individual dimming

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

o One synchronous step-down (buck) channel

o Two step-up (boost) channels

o One inverting (buck-boost) channel

with Active DC Output Control (ADOC™) technology

series

Applications

• White LED backlighting

• High-power LED driving

• TFT/LCD Displays/Monitors/TV’s

• Digital camcorders/still cameras

• Portable DVD/MP3/GPS

• Camera/smart phones

• Mobile Computing/PDA’s

The SMB112 is a highly integrated and flexible five-channel

power manager designed for powering TFT/LCD display

panels and for driving low- and high-power white-LEDs. 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 SMB112 integrates all the essential blocks required to

implement a complete five-channel power subsystem for

TFT/LCD panels including a synchronous step-down “buck”

controller, two step-up “boost” controllers, one inverting “buck-

boost” controller and one fixed output +3.3V LDO. Additionally

sophisticated power control/monitoring functions required by

complex systems are built-in.

These include digitally

programmable output voltage set point, individual dimming,

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 SMB112

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

SMB112 this facilitates rapid design cycles and proliferation

from a base design to future generations of product.

The SMB112 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.

SIMPLIFIED APPLICATIONS DRAWING

FEATURES & APPLICATIONS

Five-Channel Digitally Programmable White-LED and TFT/LCD Power Manager

Figure 1: Applications schematic featuring the SMB112 Five-channel, programmable DC-DC controller

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

SMB112

-0.8V to -10 x Vin (Prog.) @ up to 1A

Vin to 10 x Vin (Prog.) @ up to 1A

+2.7V to +6.0V

or

Li-Ion

CONTROLLER

LED Drive

VGL

MCU/RTC

I2C/SMBus

LDO

Step-Down

(Buck)

Channels

Inverter

Channel

System

Control and

Monitoring

Reset Output

Power Good

Reset Input

Vin to 10 x Vin (Prog.) @ up to 1A

VGH

2 Step-Up

(Boost)

Channels

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

+3.3V @ 20mA