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LTC3738 - 3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning

The LTC3738 is a 3-phase synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable, fixed frequency architecture. The 3-phase technique effectively triples the fundamental frequency, improving transient response while operating each controller at an optimal frequency for efficiency and ease of thermal design. Light load efficiency is optimized by using a choice of output Stage Shedding or Pulse Skip mode technology.

The LTC3738 also allows users to program load slope via a resistor for AVP control. Both external and internal thermal sensing are available from the on-chip thermal detector and comparator.

A differential amplifier provides sensing of both the high and low sides of the output voltage.

Soft-start and a defeatable, timed short-circuit shutdown protect the MOSFETs and the load. A foldback current circuit also provides protection for the external MOSFETs under short-circuit or overload conditions. An all- “1” VID detector turns off the regulator after a 1µs timeout.

U.S. Patent Numbers: 5481178, 5994885, 5929620, 6177787, 6144194, 6580258, 6462525, 6593724, 6674274, 6100678 pending on AVP technique.

Features 3-Phase Controller with Onboard MOSFET Drivers Programmable Active Voltage Positioning (AVP) with True Current Sensing Programmable External Thermal Detection or Internal Thermal Sensing Precise Output Current Matching Optimizes Thermal Performance and Solution Size Supports Starting into Precharged VOUTS Differential Amplifier Accurately Senses VOUT PWM, Pulse Skip and Stage SheddingTM Operation Synchronizable 210kHz to 530kHz Per Phase, Fixed Frequency Output Power Good Indicator with Adaptive Blanking Adjustable Soft-Start Current Ramping Short-Circuit Shutdown Timer with Defeat Option OPTI-LOOP® Compensation Minimizes COUT 38-Lead (5mm × 7mm) QFN Package Typical Application

Applications High Performance Notebook Computers Servers, Desktop Computers and Workstations Packaging

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