TPS65268QRHBTQ1

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The TPS65268QRHBTQ1 is a low-cost, low-power stage, synchronous step down DC/DC switching regulator, which belongs to the PMIC - Voltage Regulators - DC/DC Switching Regulators product category. The dissipation power of the device is 2.2 W, and the output voltage range is 1.2V - 5.5V. The overall power efficiency of the device can reach 90.3%,which is suitable for the battery operated end products or AC/DC adapter applications that require high power and small sizes.

The device features excellent load and line regulation, allowing the output voltage to remain very constant, even when the input voltage or load current changes. Internal soft start and frequency synchronization are supported. In addition, the device can support OTG switching, which can trigger the TF201 chip to power the OTG port to control the power supply.

Moreover, it features input voltage range from 4.5V to 24V, and it can output up to 5A for continuous current in a very small SON package, so it is a perfect choice in the portable devices. It also adopts the fast transient response technology and can satisfy the current shift up to 4A within 4μs. It is designed with external compensation circuitry design and can directly control the output voltage accurately.

The TPS65268QRHBTQ1 can be controlled through I2Cinterface, with an operating temperature range from -40℃ to 125℃.In terms of its working principle, the device mainly uses two MOSFETs and two inductors to convert input voltage to output voltage.

When EN pin is asserted, the switch is on and the current will flow from the input voltage source to inductor L1, the current in L1 increases and the voltage output of L1 is greater than the input voltage. At the same time, the switch of the synchronous rectifier is opened, no current flows in inductor L2, its corresponding voltage is the same as the output voltage of the buck circuit. When the voltage in L1 reaches the value of the output voltage, the controller turns off the power switch Q1 and the current in the inductor L1conducts to the output through the synchronous rectifier.

Therefore, the input voltage will decrease and the current of L1 will also start to decrease. In order to keep the output voltage stable, the synchronous rectifier will be switch on to stabilize the current flowing in the inductor L2 and make the voltage remain at the same level, consequently, it will maintain the output voltage. This process keeps repeating and forms a stable circuit, which is the basis of the synchronous buck converter.

The TPS65268QRHBTQ1 is ideal for battery powered applications and the devices powered by external adapters. It performs well in high efficiency, good load and line regulation, fast transient response, wide input voltage range and external compensation control mode, making it a perfect choice in various levels of converter application.

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