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Boost Converter – 28V from standard 2.5V to 5.5V

Through higher component integration and smaller packaging, Zetex is providing an adjustable DC-DC converter solution offering designers a significant reduction in PCB size.

PFM inductive boost converters, the ZXLD1601 and ZXLD1615 ICs produce an output voltage up to 28V from standard battery sources in the range of 2.5V to 5.5V. To help reduce external component count, both new converters include a 30V rated NDMOS switch and a peak current sensor and can generate an output current of up to 10mA at the maximum output voltage. An internal PWM filter ensures the output is flicker free.

The use of miniature, low profile packaging means the PCB space requirements are kept to the absolute minimum. The ZXLD1601 is provided in the 2.1 x 2.0 x 1.1mm SC70 and the ZXLD1615 in the 3.1 x 3.2 x 1.0mm TSOT23-5.

While the maximum converter output voltage is set by an internal resistor network, it is readily adjusted to a lower value using an external resistor network, a PWM control signal applied to the enable pin, or a combination of the two. By reducing the output voltage, an output current of up to 50mA is attainable. A highly efficient DC-DC converter solution, these latest additions to the ZXLD product family achieve a typical efficiency of 85%. To help to further extend the battery life of portable equipment, both converters consume a very low standby current of 60&microA and in addition, feature a shutdown function that reduces this current to less than 100nA in the off state.

The price of the ZXLD1615 through distributors is $0.53 in quantities of 1,000 and the price of the ZXLD1601 through distributors is $0.65 in quantities of 1,000.

Zetex PLC , Oldham, Lancs OL9 9TY, UK.
www.zetex.com

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