Summit SMB112 Technical data

SMB112

Preliminary Information

http://www.summitmicro.com/

2101 2.4 5/3/2005 1

INTRODUCTION

• Digital programming of all major parameters via I

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

• Five output channels

o One synchronous step-down (buck) channel o Two step-up (boost) channels o One inverting (buck-boost) channel

o One fixed output +3.3V LDO

•

+2.7V to +6.0V Input Range

• Highly accurate reference and output voltage (<0.5%)

with Active DC Output Control (ADOC™) technology

• Supports multiple strings of up to 12 white LEDs in

series

• Undervoltage Lockout (UVLO) with hysteresis

• 800 kHz operating frequency

• 96 bytes of user configurable nonvolatile memory

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 “buckboost” 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

C bus. All userprogrammed 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

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

查询SMB112供应商