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TI TPS53688RSBR Dual-Channel Step-Down Digital Multiphase Controller With VR13.HC SVID And PMBus

Shenzhen Mingjiada Electronics Co., Ltd, as a leading company in the field of electronic components supply chain services, has been supplying TI's high-performance TPS53688RSBR dual-channel, 8-phase step-down, digital multi-phase controllers for a long period of time, which provide high-performance power management solutions for data centres, enterprise servers and high-performance computing applications.The TPS53688RSBR is a state-of-the-art controller in a QFN-40 package. With its D-CAP+™ architecture and innovative phase management strategy, the controller excels in power conversion efficiency and dynamic response, making it an ideal choice for modern high-performance computing equipment power supply designs.

Product Overview of the TPS53688RSBR

The TPS53688RSBR is a VR13.HC SVID-compliant dual-channel step-down controller in an advanced 5mm x 5mm, 40-pin QFN package designed to meet the high power management requirements of modern high-performance computing devices. The device integrates a number of innovative technologies that set it apart from its competitors.

The D-CAP+™ control architecture is one of the core technical advantages of the TPS53688RSBR. This enhanced control mode achieves ultra-fast transient response through an optimised feedback mechanism, significantly reducing output capacitance requirements while providing excellent dynamic current sharing. The D-CAP+™ architecture eliminates the need for an external compensation network, simplifying the design process and improving system reliability compared to traditional voltage-mode or current-mode control. In practice, this feature enables power systems to respond more quickly to sudden changes in processor load, ensuring supply voltage stability, which is critical for modern multi-core processors.

TPS53688RSBR controller supports flexible N + M phase configuration (N + M ≤ 8, M ≤ 4), designers can dynamically adjust the number of operating phases according to the load demand. This ‘dynamic phase loss’ technology can automatically turn off some of the phases under light load conditions, which significantly improves the efficiency of light loads; while under heavy load conditions, it activates all the phases to ensure sufficient current supply and good heat dissipation performance.

Another outstanding feature of the TPS53688RSBR is its built-in Non-Volatile Memory (NVM) and PMBus™ interface, which allows the storage of customised configuration parameters to simplify programming steps during mass production, while the PMBus™ interface provides comprehensive digital monitoring and control capabilities, supporting real-time reading of key parameters such as output voltage, current, temperature, and advanced features such as fault logging and margin testing. These features greatly simplify system commissioning and field maintenance, bringing unprecedented flexibility and visibility to power supply design.

In terms of electrical parameters, the TPS53688RSBR supports a wide input voltage range of 4.5V to 17V, and provides programmable output voltages from 0.25V to 5.5V per channel, with an accuracy of ±0.5%, to meet the stringent requirements of modern low-voltage, high-current processors.

TPS53688RSBR Technical Specification Details

Electrical Characteristics and Performance Specification

Input voltage range: 4.5V to 17V, covering most intermediate bus architectures.

Output Voltage Range: Independently adjustable per channel from 0.25V to 5.5V.

Output Voltage Accuracy: ±0.5% reference voltage accuracy (over 0.5V to 1.5V)

Switching frequency range: 200kHz to 1MHz programmable, allowing for an optimal balance between efficiency and component size

Phase configuration: N+M phase configuration supported (N+M ≤ 8, M ≤ 4)

Operating temperature range: -40°C to +125°C

Thermal resistance parameter: 31.3°C/W for θJA (four-layer PCB condition)1

Programmable Features and Configuration Options

Loop Compensation: Programmable via PMBus, supports Type II and Type III compensation networks

Phase Trigger Sequencing: Supports multiple interleaving schemes to optimise input capacitor current ripple

Protection functions: including over-voltage, under-voltage, over-current, over-temperature protection, etc., with programmable thresholds.

Fault management: supports configurable response methods such as latch or auto-retry

Application Scenarios of TPS53688RSBR

The high-performance features of the TPS53688RSBR dual-channel digital multiphase controller have enabled it to find a wide range of applications in a number of key areas, making it a core component in the design of power supplies for modern high-performance computing equipment.

In the data centre and enterprise server markets, the TPS53688RSBR demonstrates unique value. The pursuit of energy efficiency in modern data centres has never been greater, and the TPS53688RSBR's multi-phase architecture and dynamic phase management features can significantly reduce power system energy consumption. Particularly in rackmount servers with high-performance processors such as Xeon, its VR13.HC SVID-compliant features ensure seamless collaboration with processor power management systems.

The hardware accelerator segment is another important application scenario for the TPS53688RSBR. With the explosive growth of AI and machine learning applications, accelerators such as GPUs, FPGAs, and ASICs are placing increasingly stringent demands on power systems. the TPS53688RSBR devices typically require high currents (often in excess of 100A) and a fast dynamic response to cope with sudden changes in computational loads. the TPS53688RSBR's 8-phase architecture allows for multi-phase paralleling to easily meet the high current demands, while its D-CAP+™ control technology ensures nanosecond load transient response to avoid computational errors or performance degradation due to voltage dips.

In terms of network infrastructure, the TPS53688RSBR is widely used in high-end network interface cards (NICs) and 5G base station equipment. Modern smart NICs often integrate multi-core processors and dedicated acceleration engines, requiring high integration and efficiency of the power system. the dual-channel design of the TPS53688RSBR allows for separate optimised power rails for the processor and I/O sections, while its compact QFN-40 package saves valuable PCB space. In particular, Minjata Electronics highlights that in 5G millimetre wave devices, the high switching frequency capability of the TPS53688RSBR controller (up to 1MHz or more) helps to reduce the size of passive components and meet device miniaturisation requirements.

In addition, the TPS53688RSBR is widely used in high-performance ASIC power supply designs and high-end client computing devices. In applications such as cryptocurrency miners and video processing ASICs, its precise voltage control and good thermal performance ensure stable chip operation, while in high-end desktops and gaming notebooks, it provides a quiet and efficient power solution. the TPS53688RSBR controller's PMBus interface supports communication with system management controllers, which enables intelligent monitoring and management of power systems. This feature is especially valuable in enterprise-level applications.