TPS54340DDAR

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TPS54340DDAR is an integrated 2-channel DC/DC synchronous step-down/step-up converter. It includes a dual-channel PWM controller, synchronous rectifier, adaptive on-time controllers, reference voltage source, logic, analog circuits and other peripherals to simultaneously step-down and step-up of the inputs. At TPS54340DDAR the PWM controller is provided with the adjustable mode control, which helps to control the output voltage accurately and allows for diverse modes of operation.

Application Field

The TPS54340DDAR is suited for a variety of applications. It can be used for high-current portable devices, such as digital cameras, Bluetooth headsets, and PDAs, directed designed for multi-cell phone power supplies applications, to dual-level LED backlight supplies,motor-driver control,and other distant control power supplies for household appliances,and for FPGA/ASIC/SOC system supply voltage sequences.

Working Principle

The TPS54340DDAR uses a synchronous PWM control topology to achieve high current efficiency. The architecture creates a voltage conversion across the switching MOSFETs while maintaining a low-level output ripple. The low-ripple output helps to reduce the external output capacitance resulting in smaller parts count and save board real estate. The controller synchronizes with the input voltage and regulates the output voltage by sensing the current in the synchronous rectifier.

The adaptive constant on-time control allows the TPS54340DDAR to maintain an optimal critical inductance (Lcrit) regulation. To minimize noise injection on the input voltage, the switching frequency is spread over a great range at higher light load conditions, which also improves light load efficiency. The TPS54340DDAR can be configured for operating as buck-boost, buck and boost converter.

The configuration of the TPS54340DDAR as a buck-boost converter allows a broad input voltage range from 6V up to 24V DC. At the same time the output voltage range can be set from 1.5V up to 15V DC. This feature makes the TPS54340DDAR an attractive choice for a high input voltage to low output voltage buck-boost application.The TPS54340DDAR can handle long propagation delays through its external signal lines by use of internal delay compensation.

In power-intensive applications, the integrated high-side and low-side N-Channel MOSFETs can operate up to 16A and 24A respectively. The controller is operated with a 0.75V bias voltage. The high accuracy programmable PWM-based current loop and cycle-by-cycle current limiting provides protection against over current, over voltage, and short circuit conditions. The output current can be set by a simple external resistor.

The TPS54340DDAR works with a very high efficiency. Its high switching frequency of 1MHz allows for small size inductors and capacitors. To increase the efficiency further, its adaptive constant on-time control helps to reduce transition losses and thus overall system power losses. The device works at most efficiency levels over a wide range of input/output voltage ranges and load currents.

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