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Step-down DC/DC controller offers differential output sensing

Posted: 19 Nov 2010     Print Version  Bookmark and Share

Keywords:DC/DC controller  step-down controller  output sensing 

Linear Technology Corp. delivers the LTC3833 a synchronous step-down DC/DC switching regulator controller targeted for high power applications. It drives all N-channel power MOSFETs. The controlled on-time valley current mode architecture allows for both fast transient response and constant frequency switching in steady-state operation, independent of VIN, VOUT and load current.

Differential output voltage sensing along with a precision internal reference combine to offer ±0.67% output regulation and the ability to correct for up to ±500mV variations in the output terminals due to line losses. The operating frequency can be programmed from 200kHz to 2MHz with an external resistor and can be synchronised to an external clock for noise and EMI sensitive applications.

Very low tON and tOFF times allow for near 0% and near 100% duty cycles, respectively. Programmable soft-start or output voltage tracking is available. Safety features include output over-voltage protection, programmable current limit with foldback, and a power good output signal.

It has a VIN range of 4.5V to 38V with VOUT Range of 0.6V to 5.5V. It boasts of an output accuracy of ±0.25% at 25°C and ±0.67% over temperature. It has external VCC input for bypassing internal LDO.

It is available in 20-Pin QFN (3mm×4mm) and TSSOP packages.

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