Summit SMB118 Technical data

SMB118

Advanced Datasheet

(See Last Page)

http://www.summitmicro.com/

0.4 10/7/2005

Seven-Channel Programmable DC-DC Power Manager with Battery Charger

INTRODUCTION

• Digital programming of all major parameters via I2C interface 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, switching frequency

• 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 (<1% accuracy)

• +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%)

• 500 to 1000kHz PWM frequency and power saving automatic

PFM mode

• 96 bytes of user configurable nonvolatile memory

Applications

• Portable Media Players

•

Digital camcorders/still cameras

•

Smart PDA/Camera phones

•

Handheld GPS/PDA’s

• TFT-LCD Displays/Monitors/TV’s

The SMB118 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 SMB118 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, 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, powerup/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 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 this facilitates rapid design cycles and proliferation from a base design to futures generations of product.

The SMB118 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 via the industry standard I

C bus. All user-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 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 SMB118 six-channel, programmable DC/DC converter. This integrated power supply and battery manager provides precision regulation, monitoring, cascade sequencing, output margining and battery charging.

SIMPLIFIED APPLICATIONS DRAWING

FEATURES & APPLICATIONS

SMB118

+0.5V to Vin (Prog.)

Li-Ion Battery

+2.7V to +6.0V

Analog/RF

I2C/SMBus

3 Step-

Down

(Buck)

Channels

Step-Up

(Boost)

Channel

System

Control and

Monitoring

5 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

(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

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