Power Electronics

DC-DC Power Manager Includes Battery Charger

From Summit Microelectronics, the new SMB122 is a 9-channel programmable dc-dc power manager that focuses on portable power applications. Key features include integrated FETs and one output channel dedicated as a Li-ion battery charger. The SMB122 also provides enhanced flexibility and programmability by allowing users to change functionality of several outputs in addition to parametric adjustment. The SMB122 is highly integrated to effectively combine power regulation and advanced power control into one integrated solution. Configuration data for the SMB122 is programmed via the easy-to-use PC-based graphical user interface (GUI) and is stored in on-chip EEPROM memory.

An evaluation board permits designers to optimize SMB122 settings, which are then used by Summit to factory pre-program customer production devices. The family is composed of three PWM/PFM step-down (buck) converters, one configurable PWM/PFM step-up (boost) OR buck converter, three configurable PWM/PFM boost OR inverting (buck-boost) converters, and one low-dropout (LDO) linear regulator. The SMB122 is suitable for powering components commonly found in digital consumer electronics, such as digital still cameras (DSC) and digital camcorders (DCC).

The SMB122 operates directly from a 2.7-V to 6.0-V input, making it suitable for 1-cell Li-ion (3.0-V to 4.2-V) battery applications; line-powered applications are also supported. Higher input voltages (2-cell Li-ion, 12 V) can be accommodated in many cases with simple applications configuration. The SMB122 is available in a QFN package that is lead-free and RoHS-standard compliant. Pricing in quantities of 10,000 units is $6.12.

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