Smart Slave IC with Integrated Current and Temperature Sensors

The VT1697SB is a feature-rich smart slave IC designed to work with Maxim’s seventh-generation masters to implement a high-density multiphase voltage regulator. Up to six smart slave ICs, plus a master IC, provide a compact synchronous buck converter that includes accurate individual phase-current and temperature reporting via SMBus/PMBus. This smart slave device includes protection circuits for overtemperature, VS short, all power supplies UVLO faults and main power supply OVLO fault. If a fault is detected, the slave IC will immediately shut down and send a fault signal to the master IC.

Monolithic integration and advanced packaging technologies allow practical per-phase, high switching frequencies with significantly lower losses than alternative implementations. Smart slave devices are designed to support phase-shedding and DCM modes for efficiency optimization over a wide range of load currents. High per-phase current-capability designs with low COUT enable a design with fewer phases and a smaller footprint.

The VT1697SB is packaged in a QFN package with exposed top-side thermal pads. Top-side cooling allows improved heat transfer to ambient and reduces PC board and component temperatures.

Applications

* High-Current Voltage Regulators * Microprocessor: 32-Bit and 64-Bit I/A RISC Architectures * Memory * Networking ASICs * Graphic Processors

* High Per-Phase Current Capability

* Footprint < 1600mm2 for a 150A VR

* Precise Temperature Monitoring and Reporting through a Master Controller IC SMBus

* Accurate Per-Phase Current Reporting Using a Master Controller IC

* Top-side Cooling Allows Improved Heat Transfer to Ambient

* Supplies UVLO/OVLO, Bootstrap Voltage UVLO, VX Short Protection

* Overcurrent Protection

* Overtemperature Protection—Fast Shutdown

* Switching Frequency 300KHz—1.3MHz

* Compatible With Coupled Inductor