BD3980F-E2

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The BD3980F-E2 is a 1.5-A high-efficiency step-down converter that is designed to reduce power consumption and optimize voltage and current levels in battery powered applications. It features a low quiescent current of typically 7.2 μA, which helps extend battery life in portable designs. The device offers high efficiency and fast transient response, while integrating a wide variety of power saving, protection, and control features that simplify design effort. As a member of the E2 family, the BD3980F-E2 is an optimized solution for battery-powered applications.

Overview

The BD3980F-E2 is a step-down converter for applications powered by rechargeable batteries or any other voltage sources ranging from 1.8V to 7.0V. The device provides 1.5A continuous output current with high efficiency. It is available in a Low Profile (L-PQFN) package that measures 3mm x 3mm and requires minimal board space. The device integrates an input voltage boost circuit, current-limit circuit, and high-side and low-side power switches. It is designed to operate in PWM mode with a high switching frequency of 1.3MHz, and provides good performance, fast transient response, and very low noise. Non-synchronous rectification and hysteretic modulator control with adjustable and selectable over-current protection (OCP) reduce power consumption and enhances efficiency. The BD3985F-E2 also integrates several protection features such as Thermal Shutdown (TSD), Under Voltage Lockout (UVLO), Over Voltage Protection (OVP), and Inverse Input Protection (IIP).

Application Field and Working Principle

The BD3980F-E2 is primarily designed for battery-powered applications such as wearable devices, portable media players, and Bluetooth speakers, which require low power consumption and extended battery life. Also, it can be used for other applications such as automotive, industrial, and consumer electronics due to its versatility. Its ability to operate at a wide input voltage range and high output voltage accuracy make it an ideal choice for such applications.

The BD3980F-E2 is a step-down converter that operates in Pulse Width Modulated (PWM) mode to reduce power consumption and voltage levels. It employs non-synchronous rectification to ensure that the FETs within the device are actively controlled and hence better power efficiency compared to conventional linear regulation. The switching frequency is maintained at 1.3MHz by employing a hysteretic control loop. This ensures that the output voltage remains stable even under rapid load transients.

For efficient operation, the steady-state current-limit is regulated by an adjustable voltage reference. When the current reaches this regulated value, the output voltage is limited. Overvoltage protection is provided by comparing the output voltage to a fixed OVP threshold. If the output voltage exceeds this threshold, the shutdown pin is activated, and the device is disabled. The device also includes Undervoltage Protection (UVP) to limit stress on the MOSFETs during the shutdown mode. Thermal protection is provided by means of a thermal shutdown (TSD) feature which disables the output when the temperature is above the specified limits.

Conclusion

The BD3980F-E2 is a high-efficiency step-down converter which is designed for low power battery powered applications. It supports input voltage range from 1.8V to 7.0V and provides 1.5A of continuous output current with high efficiency. It includes a current-limit circuit, input voltage boost circuit, and high-side and low-side power switches. Along with the efficiency of the device, it also includes various protection features such as Thermal shutdown, Under Voltage Lockout, Over Voltage Protection, and Inverse Input Protection to protect your system from unforeseen circumstances. This makes the BD3980F-E2 an ideal choice for applications that need to control the voltage and current levels to extend battery life.

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