The LTC3860 works in conjunction with external power train devices such as Power Blocks and DrMOS, as well as discrete N-channel MOSFETs and associated gate drivers, enabling flexible design configurations. Up to 12 phases can be paralleled and clocked out-of-phase to minimize input and output filtering for very high current requirements (up to 300A). Applications include high current power distribution and industrial systems, DSP and ASIC supplies.

The differential amplifier provides true remote output voltage sensing of both VOUT and ground terminals, enabling high accuracy regulation where IR losses occur through vias, trace runs and interconnects. The LTC3860 operates with a VCC voltage ranging from 3 V to 5.5 V, a VIN voltage (drain voltage for the high-side MOSFET) from 3 V to 24 V and produces output voltages from 0.6 V to 5 V. The device's voltage mode control architecture allows for a selectable fixed operating frequency from 250 kHz to 1.25 MHz or it can be synchronized over the same range with its phased-lock loop (PLL). The output current is sensed by monitoring the voltage drop across the output inductor (DCR) for maximum efficiency or using a sense resistor. Its adjustable current limit can be configured for very low sense voltages (0 mV to 50 mV) to minimize power loss. The LTC3860's current sharing loop enables accurate current sharing between phases across multiple IC's both DC and during a load transient.

Additional features include adjustable soft start or tracking, output overvoltage protection and two power good output signals. Furthermore, it maintains ±1 percent reference voltage accuracy over an operating temperature range of -40 to 125 degrees C.

Summary of Features: LTC3860

• Can be used with Power Blocks and DrMOS Devices

• Multiphase Operation (Up to 12-Phases) with Accurate Current Sharing

• Differential Amplifier for Remote Voltage Sensing

• V_CC Ranging from 3 V to 5.5 V

• V_IN Ranging from 3 V to 24 V

• Very Fast Transient Response

• Phase Lockable Fixed Operating Frequency from 250 kHz to 1.25 MHz

• DCR or RSENSE Output Current Sense

• Adjustable Current Limit

• Voltage Mode Control

• Dynamic Current Sharing Between Phases

• Adjustable Soft Start or Tracking

• ±1 percent Reference Voltage Accuracy over -40 to +125 degrees C

• Power Good Outputs

Availability and Pricing

The LTC3860 is housed in a 32-lead 5 mm x 5 mm QFN package and is available from stock. The 1000-piece price starts at $2.59.

Datasheet:

LTC3860