TPS63020DSJR

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TPS63020DSJR - DC DC Switching Regulators

The TPS63020DSJR is an advanced low-cost, high-efficiency, step-down switching regulator integrated circuit (IC) that can be used for various applications, such as charging lithium-ion batteries, powering sub-systems, and battery management applications. This device is available in a thermally efficient 5 mm × 5 mm QFN package. It is also very small in size and suitable for integration into a variety of systems.

Features

The TPS63020DSJR is a highly-integrated buck regulator that can step down a supply voltage from 4.5 V to 0.6 V with a minimum dropout voltage of 75 mV. It features an input range of 3.2 V to 36 V and provides an output current of up to 2 A. It has an adjustable output voltage and can be programmed with external resistors. Moreover, it also has an enable pin, providing the option to enable or disable the regulator circuitry.

The TPS63020DSJR features a power-save mode to reduce the quiescent current at low load conditions, increasing battery life. The device can operate in forced PWM mode, allowing it to achieve high efficiency over a wide output current range. It offers excellent EMI performance, thanks to its spread spectrum frequency modulation, and a low ripple current that reduces switching noise.

Other notable features of the device include an adjustable soft-start, an output voltage tracking pin, an under voltage lockout (UVLO) for input voltage protection, a thermal shutdown for overload protection, an over-temperature protection, a short-circuit protection, and a low noise operation.

Application Fields

The combination of a switch-mode power supply and a synchronous rectifier is a widely used high-efficiency power conversion topology. The TPS63020DSJR can be used in a variety of applications such as charging lithium-ion battery systems, powering sub-systems, and battery management applications. It can also be used to power LED drivers, DC motors, and other applications where low voltage, high efficiency is required. Furthermore, the small size of the device makes it suitable for integration into wearables and other handheld devices.

Working Principle

The TPS63020DSJR is a voltage-mode buck regulator that uses a synchronous rectifier to convert an input voltage into an output voltage. In operation, it steps down the input voltage at a fixed frequency (e.g. 500 kHz) and uses a control loop to regulate the output voltage. The control loop consists of a voltage error amplifier and an oscillator, which together generate the pulse width modulation (PWM) signal that controls the duty cycle of the switching transistors. The reference voltage for the regulator is generated by an internal bandgap voltage reference source.

To ensure stability, the device implements a frequency compensation network, which consists of an external capacitor and a resistor. This network adjusts the loop gain and phase, preventing the PWM control loop from entering an unstable state. The device also features an adjustable soft-start feature, allowing the output voltage to ramp up smoothly over a preset time period. This soft-start protects the sensitive components of the system from inrush current, which can occur when the IC is initially powered up.

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