LTC7851-1 Datasheet | Analog Devices

LTC7851/LTC7851-1 Quad Output, Multiphase Step-Down Voltage Mode DC/DC Controller with Accurate Current Sharing Features nn Operates with Power Blocks, Dr MOS or External Gate Drivers and MOSFETs nn Voltage Mode Control with Accurate Current Sharing nn ±0.75% 0.6V Voltage Reference nn Quad Differential Output Voltage Sense Amplifiers nn Multiphase Capability nn Phase-Lockable Fixed Frequency 250k Hz to 2.25MHz nn Lossless Current Sensing Using Inductor DCR or Precision Current Sensing with Sense Resistor or Dr MOS with Integrated Current Sensing nn VCC Range: 3V to 5.5V nn VOUT Range: 0.6V to VCC - 0.5V nn Power Good Output Voltage Monitor nn Output Voltage Tracking Capability with Soft-Start nn Available in 58-Lead 5mm × 9mm QFN Package APPLICATIONS nn High Current Distributed Power Systems nn DSP, FPGA and ASIC Supplies nn Data, Tele and puting Systems 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, bined 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 Dr MOS devices with internal current sense. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. Patents, including 6144194, 5055767. - See Note 5. TYPICAL...