LTC3819 - LTC3819是2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs

LTC3819是LINEAR凌力尔特公司的一款数字可编程的降压型稳压器产品，LTC3819是LTC3819是2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs，本站介绍了LTC3819的封装应用图解、特点和优点、功能等，并给出了与LTC3819相关的LINEAR元器件型号供参考。

LTC3819 - LTC3819是2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs - 数字可编程的降压型稳压器 - 电源管理 - 凌力尔特

LTC3819 - 2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs

LTC3819 - 2-Phase, High Efficiency, Step-Down Controller for Sun Server CPUs - Linear Technology（凌力尔特）

功能描述

The LTC3819 is a 2-phase, VID programmable, synchronous step-down switching regulator controller that drives two N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies up to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified.

An operating mode select pin (FCB) can be used to select among three modes including Burst Mode operation for highest efficiency. An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required in high current applications.

The RUN/SS pin provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when the overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized for a wide range of output capacitors and ESR values.

特点

Output Stages Operate Antiphase Reducing Input and Output Capacitance Requirements and Power Supply Induced Noise

Dual Input Supply Capability for Load Sharing

5-Bit SUN CPU VID Code:VOUT = 1.025V to 1.4125V

±1% Output Voltage Accuracy

True Remote Sensing Differential Amplifier

Power Good Output Voltage Monitor

Supports Active Voltage Positioning

Current Mode Control Ensures Current Sharing

OPTI-LOOP Compensation Minimizes COUT

Three Operational Modes: PWM, Burst and Cycle Skip

Programmable Fixed Frequency: 150kHz to 300kHz