SMB118/218

© SUMMIT Microelectronics, Inc. 2008

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

1

http://www.summitmicro.com/

2107 3.0 10/15/2008

Six-Channel Programmable DC-DC Power Managers with Battery Charger

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

• Six programmable regulator channels with 1.5% accuracy

o

Three synchronous step-down (Buck) with

internal PFETs

o

One configurable step-up (Boost) or

synchronous step-down (Buck)

o

One step-up (Boost)

o

One adjustable output voltage LDO

• Programmable Linear Li-Ion Battery Charger

o

Precharge/fast charge/termination current

o

Fast Charge voltage threshold

o

Float Voltage

• +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

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

Applications

• TFT-LCD Displays/Monitors/TVs

The SMB118 and SMB218 are highly integrated and flexible six-

channel power managers 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 SMB118 and SMB218 integrate 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, one step-up

“Boost” converter, one linear regulator (LDO) and a fully programmable

Li-Ion

battery

charger.

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

and

UV/OV

input/output monitoring on all channels.

The integration of features and built-in flexibility of the SMB118 and

SMB218 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 SMB118 and SMB218,

this facilitates rapid design cycles and proliferation from a base design

to futures generations of product.

The SMB118 and SMB218 are suited to battery-powered applications

with an input range of +2.7V to +6.0V and provide a very accurate

voltage regulation. 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.

SMB118/218

+0.5V to Vin (Prog.)

Li-Ion Battery

or

+2.7V to +6.0V

Analog/RF

I2C/SMBus

3 Step-

Down

(Buck)

Channels

Step-Up

(Boost)

Channel

System

Control and

Monitoring

HEALTHY Output

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

(Boost) or

Step-Down

(Buck)

Channel

Li-Ion

Charger

+4.5V to +6.0V

DC IN

Pushbutton Power

+0.5V to +35V (Prog.)

LED Backlight

Drive

LDO

Channel

+1.5V to +3.75V (Prog.)

MCU/RTC

RESET Output

Figure 1 – Applications block diagram featuring the SMB118/218 six-channel, programmable DC/DC

converters. These integrated power supply and battery managers provide precision regulation, monitoring,

cascade sequencing, output margining and battery charging.

SIMPLIFIED APPLICATIONS DRAWING

FEATURES & APPLICATIONS

PLEASE NOTE: The SMB118 has entered End-of-Life.