TPS56637RPAR Datasheet

TI’s TPS56637RPAR Synchronous buck converter

If one aspect of circuit operation had to be selected as the most important, effective power management would be the choice. In addition to essential passive components, like resistors and capacitors, today’s circuit board’s invariably include active components and integrated circuits (ICs). Many discrete parts, like amplifiers, come in integrated circuit or IC packages with specific power requirements that must be supplied for operational integrity of the circuit and/or PCB.

For circuit boards, AC to DC or DC to DC converters are typically implemented to ensure the electrical supply for components and packages satisfies demand. A common type of converter is the synchronous buck converter. One of the most implemented of this type of converter is the TPS56637RPAR from Texas Instruments, Inc.

TPS56637RPAR: Features and Applications

The TPS56637RPAR synchronous buck converter has a wide input operating range from 4.5 V to 28 V. This converter is a high efficiency device comprised of integrated MOSFETs. Notable features and common applications are listed below.

TPS56637RPAR FEATURES AND APPLICATIONS
Important Features	Common Applications
Input range: 4.5 V to 28 V	Storage
Output range: 0.6 V to 13 V	Printers
Maximum continuous current of 6 A	Portable electronics
26 mΩ and 12 mΩ integrated MOSFETs	TVs, box-top devices
Switching frequency of 500 kHz	Electronic point-of-sale (POS) devices
Fast transient response	Motor drives
Undervoltage, overvoltage, overtemperature, and undervoltage lockout protections	Industrial automation
Small HotRod™ quad flat no-lead package	Factory control

As shown above, the TPS56637RPAR is a good general purpose converter that can be used in various applications.

TPS56637RPAR: Electrical and Thermal Information

Familiarity with device characteristics, as detailed in the TPS56637RPAR datasheet, is important for incorporating the converter into your design.

Constraints and Recommendations

Maximum ratings for the TPS56637RPAR

In addition to the constraints above, the manufacturer recommends complying with the following operational requirements.

Recommended operating ranges for the TPS56637RPAR

Specifications

The following electrical and thermal parametric specifications should guide your PCB design with the TPS6637RPAR.

TPS56637RPAR electrical specifications

TPS56637RPAR thermal specifications

TPS56637RPAR: Architecture and Operation

The TPS56637RPAR datasheet also provides details about the converter’s layout and operation, which is essential for effective design and implementation.

Pinout and Descriptions

As shown below, the TPS56637RPAR comes efficiently packaged in a HotRod QFN to optimize thermal management and minimize board real estate usage. These efficient operation attributes are augmented by monitoring and control capabilities for voltage, current and temperature to prevent device malfunction.

TPS56637RPAR pinout

TPS56637RPAR pin descriptions

Diagram and Functionality

The function diagram for the device is shown below.

Functional block diagram of the TPS5667RPAR

The TPS5667RPAR is designed to provide reliable power control for connected loads with minimal external circuitry requirements. Additionally, seamless transition between high and low load operations.

TPS56637RPAR Operation Modes:

Normal Operation
This is the typical operation mode for the converter. In this mode, the switching frequency is 500 kHz and continuous conduction occurs.

Light Load Operation
For light load operational efficiency, forced continuous conduction mode (FCCM) is invoked by allowing pin 10 to float. Additionally, ECO-mode can be selected during which unnecessary internal functionality is turned off to aid in stability for light loads.

Standby
When selected, all switching is suspended and the device current drops to the shutdown value of approximately 2 µA.

PCB Design With the TPS56637RPAR Datasheet

The TPS56637 datasheet is an invaluable resource for efficient and effective board design with this synchronous buck converter. In addition to design specifications, functionality, and operation, as discussed above, a suggested procedure for PCB layout design that should be integrated with general best practices, is included.

TPS56637RPAR Datasheet PCB Layout Design Paradigm

Opt for a 4-layer architecture
Make signal and ground traces as wide as possible
Use two vias placed close to the input and ground pins
Place both input and output capacitors as close to the component as feasible
Use vias for input and output capacitors, as well
Use short SW trace
Avoid switching current flowing underneath the component
A dedicated VOUT to feedback resistor path should be provided
Use a 4-wire Kelvin connection for the feedback path to the GND pin
Switching trace and voltage feedback loop (preferably with a ground shield) should be separated
Keep VFB node trace short as possible
Use a wide trace between GND pin and output capacitor

An example layout design (below) is also provided for guidance with your design.

Example layout for the TPS56637RPAR

Your ability to leverage the wealth of device information and design data given for the TPS56637RPAR rests on your choice of an accurate CAD model, as shown below.

TPS56637RPAR CAD models from Ultra Librarian

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