Summit Releases SMB122 Multi-Output Power IC
Summit Microelectronics Inc. (San Jose, CA), a supplier of programmable, mixed-signal, power management platform solutions, introduced its new SMB122 programmable power manager, multi-output, power supply ICs, which focus on portable power applications. The SMB122 operates directly from a +2.7 V to +6.0 V input, making it suited for one-cell, lithium-ion (Li-Ion) (+3.0 V to +4.2 V) battery applications, though line-powered applications are easily supported as well. Higher input voltages (two-cell Li-Ion, +12 V) can be accommodated in many cases with simple applications configuration.
The SMB122 provides enhanced flexibility and programmability compared to the first generation, as the functionality of several outputs can be changed in addition to parametric adjustment. The entire multiple-output power supply and associated power-management functions can be digitally programmed with a few clicks of a mouse. The SMB122 is well suited for powering components commonly found in digital consumer electronics such as digital still cameras/camcorders, portable MP3/MEPG4 players, GPS terminals, personal digital assistants, portable LCD televisions, as well as the next generation of "smart" mobile phones.
The SMB122 combines power regulation and advanced power control into one integrated solution. In addition to the step-down, step-up, inverting, low-dropout voltage outputs and the Li-Ion charger, the SMB122's power control functions include individual channel enable/shutdown, power up/down sequencing, power-up slew rate control, and static and dynamic output-voltage control (dynamic voltage management). The battery charger is also fully programmable for all the Li-Ion CC/CV parameters with 0.5 percent float voltage accuracy. Additionally, complete power system diagnostics and monitoring is provided via the I2C serial interface and digital status outputs. These include input and output monitoring for under/over-voltage/over-current with integrated system RESET control, low/missing battery detection, and ac-dc adapter detection. All configuration data for the SMB122 is programmed via the PC-based graphical user interface and is stored in on-chip EEPROM memory. The device can be programmed during development and then used in a "fixed" configuration, or it may be re-programmed in-system via the I2C interface.
Of the eight programmable regulators, four are also functionally configurable: three PWM/PFM step-down (buck) converters, one configurable PWM/PFM step-up (boost) or step-down (buck) converter, three configurable PWM/PFM step-up (boost) or inverting (buck-boost) converters, and one low-dropout linear regulator. All outputs are programmable for sequencing/enable, output voltage (static and dynamic to 1.5 percent accuracy), and under/over-voltage/over-current monitoring. Programmable phase interleaving for the switching regulators also reduces noise and peak battery loading. Short-circuit current limiting and thermal protection safety circuits are also built in to enhance reliability.
The operating temperature range is +0 °C to +70 °C, or -40 °C to +85 °C, and is available in the 64-pad, QFN package that is lead-free and RoHS-standard compliant. Available now in production quantities, the device is priced at $6.12 each in quantities of 10,000 units. Summit offers the SMB122EV companion evaluation board and a graphic user interface software for use with the SMB122. The design kit software can be downloaded from Summit's website.
