Analog Devices LTC7851

Description

The LTC®7851/LTC7851-1 are quad output multiphase synchronous step-down switching regulator controllers that employ a constant frequency voltage mode architecture. They maintain excellent current balance between channels when paralleled with their internal current sharing loop. Lossless DCR or a low value RSENSE is used for output current sensing. Multiple LTC7851/LTC7851-1 devices can be used for high phase count operation.A very low offset, high bandwidth error amplifier, combined with remote output voltage sensing, provides excellent transient response and output regulation. The LTC7851/ LTC7851-1 operates with a VCC supply voltage from 3V to 5.5V and is designed for step-down conversion with VIN from 3V to 27V* and produces an output voltage from 0.6V to VCC – 0.5V.The LTC7851-1 is identical to the LTC7851 except it has a lower current sense amplifier gain, making it ideal for DrMOS devices with internal current sense.

Features

Operates with Power Blocks, DrMOS or External Gate Drivers and MOSFETsVoltage Mode Control with Accurate Current Sharing±0.75% 0.6V Voltage ReferenceQuad Differential Output Voltage Sense AmplifiersMultiphase CapabilityPhase-Lockable Fixed Frequency 250kHz to 2.25MHzLossless Current Sensing Using Inductor DCR or Precision Current Sensing with Sense Resistor or DrMOS with Integrated Current SensingVCC Range: 3V to 5.5VVOUT Range: 0.6V to VCC – 0.5VPower Good Output Voltage MonitorOutput Voltage Tracking Capability with Soft-StartAvailable in 58-Lead 5mm × 9mm QFN Package

Typical applications

• High Current Distributed Power Systems
• DSP, FPGA and ASIC Supplies
• Datacom, Telecom and Computing Systems

More information

• Datasheet
• IC product information