Configurable power management IC maximizes battery life

Summit Microelectronics

Summit Microelectronics announces an addition to its family of multi-output power supply ICs. Like its predecessors, the new SMB118 combines power delivery and control, while occupying a significantly smaller board space than traditional solutions. The SMB118 allows for a high degree of design flexibility, both in terms of parametric adjustment and functional configuration. Compared to the tedious iterative hardware design of conventional analog power ICs, the Summit solution can significantly improve development cycle time.

The SMB118 incorporates three synchronous step-down converters, one step-up converter, one configurable step-up or step-down converter, one low-dropout linear regulator and an I2 C interface that allows both design flexibility and sophisticated power monitoring and control. A fully-programmable Li-Ion battery charger is included for single-cell Li-Ion and Li-Polymer batteries. All charging parameters are configurable, enabling the utilization of a wide variety of battery packs without hardware changes.

“The SMB118 delivers a complete, one-chip, power management solution for today’s space-constrained designs,” stated Abid Hussain, Summit director of marketing. “By integrating a fully-programmable battery charger, designers gain unparalleled levels of flexibility in battery pack selection and charging algorithm implementation. Our device suits applications where both high-performance power delivery and control are critical benefits.”

The SMB118 provides total system control by allowing the user to configure power functions and parameters for each channel: individual channel enabling/disabling, power-up/down sequencing, power-up slew rate control, static and dynamic output voltage control (Dynamic Voltage Management). A broad range of intelligent power system diagnostics and monitoring functions are also provided, which can be easily accessed via the I2 C serial interface. These include input and output monitoring for under/over-voltage/over-current (UV/OV/OC), low/missing battery detection and AC/DC battery detection.

The SMB118 offers an output voltage accuracy of ±1.5%or better for all DC/DC channels and a float voltage accuracy of ±1.0%or better for the battery charger. A low-power shutdown mode allows the device to reduce current consumption to 0.1μA when not in operation, thereby extending battery life. Automatic PWM/PFM operation is also provided to enhance light load efficiency with PWM override for noise sensitive RF or audio application. In addition, the oscillator frequency is selectable between 500kHz and 1MHz in 250kHz steps. Voltage conversion for the very common rails of +2.5V and +3.3V can achieve efficiency of up to 95%, thereby optimizing power delivery from the battery to the system. Short circuit current limiting and thermal protection safety circuits are also built-in to enhance reliability.

The SMB118 power manager integrates all the necessary analog and digital blocks powering components commonly found in portable digital consumer electronics, including digital still cameras/camcorders (DSC/DCC), portable MP3/MEPG4 players, GPS terminals, personal digital assistants (PDAs), as well as the next generation of “smart” mobile phones. The device’s dynamic voltage management feature is particularly useful in Xscale and ARM CPU applications and where LED backlight brightness control is desired.

See application block diagram

All configuration data for the SMB118 is programmed via the easy to use PC-based graphical user interface (GUI) and is stored in on-chip EEPROM memory, of which 96 bytes are available for user data storage. Enhancing flexibility even further, the device can be programmed during development and then used in a “fixed” configuration or it may be re-programmed in-system via the I2 C interface.

The SMB118 operates directly from +2.7V to +6.0V input making it ideally suited for 1-cell Li-Ion or Li-Polymer (+3.0V to +4.2V) battery applications, though line-powered applications are easily supported as well. Higher input voltages (2-cell Li-Ion, +12V) can be accommodated in many cases with simple applications configuration. The operating temperature range is +0°C to +70°C or –40°C to +85°C and is available in a space-saving 7×7 48-pad QFN package that is lead-free and RoHS-standard compliant. Available now in production quantities, the device is priced at $4.89 each in quantities of 10,000 units.

To speed user product development, Summit offers customers the SMB118EV companion evaluation board and a graphic user interface (GUI) software so designers can quickly see the features and benefits and design a prototype power supply with the SMB118. This is a complete development tool that lets designers easily manipulate the characteristics of their systems. The SMB118EV design kit includes menu-driven Microsoft Windows graphic user interface (GUI) software to automate programming tasks and also includes all necessary hardware to interface to the parallel or USB port of a laptop or PC.

Once a user completes design and prototyping, the SMB118EV automatically generates a HEX data file that can be transmitted to Summit for review and approval. Summit then assigns a unique customer identification code to the HEX file and programs the customer’s production devices prior to final electrical test operations. This ensures that the device will operate properly in the end application. The design kit software can be downloaded today from Summit’s website.

For more information on this product is: SMB118/SMB118.htm

Summit Microelectronics, 1717 Fox Drive, San Jose, CA 95131. Tel: 408-436-9890

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