Summit SMB122 Technical data

SMB122

Advanced Specification

1

(See Last Page)

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

http://www.summitmicro.com/

1.2 11/11/2005

Nine-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

• Eight 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 Two step-up (boost)
o One configurable step-up (boost) or inverting

step-up/down (buck-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 (<0.5% 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 automatic power-saving

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 SMB122 is a highly integrated and flexible nine-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 SMB122 integrates all the essential blocks required to implement
a complete nine-channel power subsystem including three
synchronous step-down “buck” converters, one configurable step-up
“boost” or step-down synchronous “buck” converter, two step-up
(boost) converters, one configurable step-up “boost” or inverting step­up/down “buck-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 SMB122 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 SMB122 this facilitates rapid design
cycles and proliferation from a base design to futures generations of
product.

The SMB122 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

2

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 64-pad 9mm x 9mm QFN.

SM B122

+0 .5 V to V in (P ro g .)

Li-Io n B attery

or

+2.7V to +6.0V

Analog/RF

+1.5V to +3.75V

MCU/RTC

I2C/SMBus

LDO

3 Step-

Down

Channels

System
Control

and

Monitoring

Status Outputs

Shutdown

+0 .5 V to + 35V (P ro g .)

Memory, I/O

+0 .5 V to V in (P ro g .)

CPU Core

+0 .5 V to V in (P ro g .)

DSP/CO DEC

Step-Up or
Step-Down

Channel

Li-Ion

Charger

+4.5V to +6.0V

DC IN

Control Inputs

Pushbutton Power

-35V to +35V (Prog.) TFT-LCD/
CCD Sensor

Step-Up or

Invertin g

Channel

2 Step-Up
Channels

V in to +35 V (P ro g .) LED

Backlight

V in to +35 V (P ro g .) TFT-LCD

Bias

Figure 1 – Applications block diagram featuring the SMB122 eight-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

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