Digital power chip gets PWM signalling feature

Linear Technology has added a three-state PWM signalling feature to its LTC3887 range of dual output synchronous step-down DC/DC controllers with I²C-based PMBus interface.

The intention of adding the PWM signal is to support the use of DrMOS, power blocks or similar power stages.

The LTC3887-1 also has a faster 70ms power-up time and a fast ADC mode that provides an 8ms update rate for one parameter.

The controller can be used to regulate two independent outputs or can be configured for a 2-phase single output from 0.5V to 5.5V.

Up to six phases can be interleaved and paralleled for sharing among multiple ICs. The result is a reduced need for input and output filtering in high current or multiple output applications, says Linear.

The voltage controller operates over an input voltage ranging from 4.5V to 24V, and it produces ±0.50% accurate output voltages from 0.5V to 5.5V with output currents up to 40A per phase over the full operating temperature range.

 

The device is available in a 40-pin 6mm x 6mm QFN package with an operating junction temperature range from -40°C to 125°C.

 

Richard Wilson

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