TPS65287RHAR

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The TPS65287RHAR is a DC-DC switching regulator from Texas Instruments that is designed for use in very low power applications such as portable devices, battery-powered systems, and wearables. The TPS65287RHAR is part of TI’s Simple Switcher portfolio which is targeted at low-cost power solutions for smaller products. The TPS65287RHAR is designed to replace linear voltage regulators in many applications, allowing for a reduced board area, power loss, and improved efficiency.

Key Features

The TPS65287RHAR includes a wide range of features, optimized for low-power applications. The key features include:

• Operates in up to 32V input voltage range
• Very low external component count
• Programmable 3.2V to 5.5V output voltage range.
• Max 150mA output current
• High efficiency up to 93.4%
• Low-Power Shutdown mode - Power can be quickly enabled/disabled
• Power Good output signal with programmable delay
• Integrated MOSFET allows for high efficiency

Application Field

Due to its very low external component count and high efficiency, the TPS65287RHAR is ideal for use in ultra-low power applications such as portable or wearable products, or battery-powered products where board space or power efficiency is paramount. It is also extremely suitable for applications that require a wide input voltage range, such as products that are operated in both AC and DC environments.

Schematics and Example

The following diagrams shows the basic schematic of a typical TPS65287RHAR application. The example shows a 1.8V output voltage at 150mA output current. The output voltage can be easily changed with a single resistor (R1) and the output current can be increased by using larger inductors and capacitors.

Working Principle

The TPS65287RHAR is a DC-DC switching regulator that uses an inductor to store energy and transfer it to the output stage. When high side MOSFET (M1) is on, energy is stored in the inductor, and when low side MOSFET (M2) is on, the stored energy is transferred to the output stage (L1 and C1). During the entire cycle, the voltage is regulated to the desired output voltage by the internal control loop adjusting the duty cycle.

Pros and Cons

The TPS65287RHAR provides many advantages over linear voltage regulators, such as higher efficiency, smaller PCB area, and lower power consumption. However, it does require the use of additional components for operation, such as inductors, capacitors, and resistors. Also, the output voltage is difficult to adjust and the output current is limited.

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