Phase Extender, Slave Step-Down Controller for up to 240A
Compatible with Digital Power System Management
The LTC3870 is an alternative to Linear Technology's full-featured controllers and provides the essential functions for multiphase slave designs. It operates over an input voltage range of 4.5V to 60V and produces a fixed output voltage up to 14V. Up to 12 phases can be paralleled and clocked out-of-phase to minimize filtering. Its peak current-mode architecture allows for accurate phase-to-phase current sharing even for dynamic loads. Applications include power distribution, redundant (n+1) supplies, industrial systems, DSP and ASIC power.
The LTC3870 has a fixed operating frequency from 250kHz to 1MHz, or it can be synchronized to an external clock. The powerful 1.1 Ohm onboard all N-channel gate drivers minimize MOSFET switching losses. Precise programmable current sense threshold limits from 50mV to 72mV minimize power loss and accurately set the overcurrent trip point. Additional features include selectable continuous or discontinuous light load operation, programmable phase shift control and overvoltage protection.
The LTC3870 is available in a 28-lead 4mm x 5mm QFN package. The 1,000-piece price starts at $2.35 each. For more information, visit www.linear.com/product/LTC3870.
Summary of Features: LTC3870
- Phase Extender for High Phase Count Voltage Rails
- Ideal for Use with Digital Power System Management Master Controllers LTC3880 & LTC3883
- Accurate Phase-to-Phase Current Sharing
- Peak Current-Mode Control
- Wide VIN Range: 4.5V to 60V
- VOUT Range: Up to 14V
- Up to 12-Phase Operation
- High Output Current Capable - Up to 240A
- Programmable Phase Shift Control
- Adjustable Current Sense Threshold from 50mV to 72mV
- Phase-Lockable Fixed Operating Frequency from 250kHz to 1MHz
- Powerful Onboard 1.1 Ohm Gate Drivers
- Overvoltage & Overcurrent Protection
LINEAR TECHNOLOGY GmbH
Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company's products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit www.linear.com.