Kirchheim/Teck, Germany—Dialog Semiconductor's DA9025 multi-block power management subsystem, which contains a buck converter providing up to 400 mA, four low dropout (LDO) regulators and a supply for a real time clock, has the facility to handle the requirements of a typical lithium-ion powered handheld application (e.g., processor controlled system with memory and analog functionality such as data conversion and sensor interfacing).
The chip's integrated DC/DC buck regulator, suited to powering a system processor and memory, has a programmable range of 0.85 to 3.3 volts, with a default voltage of 1.8 volts at up to 400 mA. The regulator may be set to operate in either a synchronous or asynchronous mode. It integrates switching FETs and uses a minimum number of external components. The chip's I2C bus environment allows for easy control and programming of output voltages and power in individual blocks. Alternatively, the IC can also be applied in stand alone applications with a predetermined power-up sequence.
Two of the DA9025's LDOs are reportedly very low-noise devices that provide more than 80 dB power supply rejection, and thus are suited to audio and RF circuits. A fifth regulator provides a supply for a real time clock. This output is permanently active when the battery is connected. Battery power lines to the regulators are separated to maximize isolation.
The device datasheet may be secured by clicking here. The DA9025 is priced at 94 cents each in 100k quantities.
Dialog Semiconductor, +49-7021-805-412, www.dialog-semiconductor.com