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| SMB118 Advanced Datasheet1 (See Last Page) Seven-Channel Programmable DC-DC Power Manager with Battery Charger FEATURES & APPLICATIONS * Digital programming of all major parameters via I C 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 2 INTRODUCTION 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 2 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. Applications * * * * Portable Media Players Digital camcorders/still cameras Smart PDA/Camera phones Handheld GPS/PDA's * TFT-LCD Displays/Monitors/TV's SIMPLIFIED APPLICATIONS DRAWING SMB118 +4.5V to +6.0V DC IN Li-Ion Charger Step-Up (Boost) Channel +0.5V to +35V (Prog.) LED Backlight Drive Li-Ion Battery or +2.7V to +6.0V LDO Channel +1.5V to +3.75V (Prog.) MCU/RTC I2C/SMBus Step-Up (Boost) or Step-Down (Buck) Channel System Control and Monitoring +0.5V to +35V (Prog.) Memory, I/O +0.5V to Vin (Prog.) 3 StepDown (Buck) Channels Pushbutton Power Shutdown CPU Core +0.5V to Vin (Prog.) DSP/CODEC 5 Status Outputs +0.5V to Vin (Prog.) Analog/RF 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. (c) SUMMIT Microelectronics, Inc. 2005 1717 Fox Drive * San Jose CA 95131 * Phone 408 436-9890 * FAX 408 436-9897 1 http://www.summitmicro.com/ 0.4 10/7/2005 |
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