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ON Semi dc/dc controller targets portable systems

Posted: 16 Oct 2002 ?? ?Print Version ?Bookmark and Share

Keywords:on semiconductor? ncp1550? step down dc controller? dc/dc controller ic? power controller ic?

Designed for use in portable devices, computer peripherals, and distributed power systems, the NCP1550 step-down dc/dc controller IC from ON Semiconductor functions from a 2.4V to 5.5V input - enabling the IC to operate directly from a one-cell lithium ion battery or a 3-cell NiMH battery - and delivers an output voltage ranging from 1.8V to 3.3V.

When designed into a power supply system using external p-type MOSFETs, the TSOP-5 device can provide up to 2A loading current with high conversion efficiency. It runs in PWM mode at 600kHz during normal operation to ensure low output ripple noise at heavy output loads. The device then automatically switches to PFM mode at low loads to provide a higher efficiency.

A Chip Enable feature reduces current drain to 0.3?A when the handheld electronic device is in shutdown mode. Also included is an integrated feedback resistor network to reduce the external component count.

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