March 14, 2014 – Linear Technology Korea (CEO Hong Sa-kwak) announced the launch of the dual-phase synchronous stepdown slave controller (product name: LTC3870). When used with a master controller, it can generate current up to 240A maximum by expanding the number of phases in multi-phase applications. Compatible master controllers include the LTC3880 and LTC3883 digital power system management controllers.

The LTC3870 is a feature-rich alternative controller from Linear Technology that provides essential functionality for multi-phase slave design. This product operates over an input voltage range of 4.5V to 60V and generates fixed output voltage up to 14V maximum. Up to 12 phases can be paralleled, with phases clocked differently to minimize filtering. The product's peak current mode architecture enables accurate current sharing between phases even under dynamic loads. Applications include power distribution, redundant (n+1) power supplies, industrial systems, DSP and ASIC power.

The LTC3870 can operate at fixed frequencies ranging from 250kHz to 1MHz or be synchronized to an external clock. Robust onboard all N-channel gate drivers with 1.1 Ohm minimize MOSFET switching losses. Precision programmable current sense threshold range of 50mV to 72mV minimizes power loss and accurately sets overcurrent trip points. Additional features include selectable continuous or discontinuous light load operation, programmable phase transition control, and overvoltage protection capability.

The LTC3870 is available in a 28-pin 4mm x 5mm QFN package.

Photo Caption: Phase Extender Slave Stepdown Controller