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SMB112
Five-Channel Digitally Programmable White-LED and TFT/LCD Power Manager
FEATURES & APPLICATIONS
* Digital programming of all major parameters via I C
2
Preliminary Information
INTRODUCTION
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 ADOCTM technology. 2 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.
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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 (ADOCTM) 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
SIMPLIFIED APPLICATIONS DRAWING
SMB112
+2.7V to +6.0V or Li-Ion LDO Inverter Channel
+3.3V @ 20mA
MCU/RTC
-0.8V to -10 x Vin (Prog.) @ up to 1A
VGL
Vin to 10 x Vin (Prog.) @ up to 1A I2C/SMBus System Control and Monitoring 2 Step-Up (Boost) Channels
LED Drive
Vin to 10 x Vin (Prog.) @ up to 1A
VGH
Reset Input Reset Output Power Good
Step-Down (Buck) Channels
+0.8V to 0.9 x Vin (Prog.) @ 2A
CONTROLLER
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.
(c) 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
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