Analog Devices LTC7851 Product Info

• Operates with Power Blocks, DrMOS or External Gate Drivers and MOSFETs
• Voltage Mode Control with Accurate Current Sharing
• ±0.75% 0.6V Voltage Reference
• Quad Differential Output Voltage Sense Amplifiers
• Multiphase Capability
• Phase-Lockable Fixed Frequency 250kHz to 2.25MHz
• Lossless Current Sensing Using Inductor DCR or Precision Current Sensing with Sense Resistor or DrMOS with Integrated Current Sensing
• V_CC Range: 3V to 5.5V
• V_OUT Range: 0.6V to V_CC – 0.5V
• Power Good Output Voltage Monitor
• Output Voltage Tracking Capability with Soft-Start
• Available in 58-Lead 5mm × 9mm QFN Package

The LTC7851/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 R_SENSE 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 V_CC supply voltage from 3V to 5.5V and is designed for step-down conversion with V_IN from 3V to 27V and produces an output voltage from 0.6V to V_CC – 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.

Applications

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