Tweet

Posted on 10 March 2019

ROHM’s Compact, High-Efficiency, High Power Synchronous Boost DC/DC Converter IC

Boost DC-DC converter IC

 

Contributes to improved performance and longer battery life in portables such as smartphones and tablets

ROHM has recently announced the availability of a compact, high-efficiency, high power synchronous boost DC/DC converter IC optimized for single-cell battery applications.

Many of today’s portable devices (i.e. smartphones and tablets) are driven by single-cell li-ion batteries that deliver an output of approximately 4.2V at full charge. However, when connecting to interfaces requiring 5V output, such as USB, HDMI, and audio amps for speakers, a DC/DC converter is needed to boost the voltage. At the same time, longer battery life along with greater efficiency are demanded in a smaller form factor.

In response, the BD1865GWL features a lower operating limit of 2.5V, prolonging battery life in devices by extending operation down from the conventional 2.7V. In addition, two operating modes are built in, PWM/PFM mode and ROHM’s original mixing PWM mode. The former ensures up to 90% efficiency across all load regions, while the latter prevents unwanted switching noise in audio applications. The BD1865GWL is also capable of delivering output currents up to 2A in a compact 1.6mm x 1.6mm package, contributing to greater end-product miniaturization.

Key Features

1.Low voltage drive prolongs battery life

When the remaining battery level is low, the input voltage into the system (battery output voltage) decreases. Utilizing industry-leading analog design technology cultivated over many years have allowed ROHM to deliver stable 5V output even at input voltages as low as 2.5V, extending battery life considerably.

2.Two control modes improve efficiency and performance

PFM/PWM Mode
This mode automatically switches between PFM and PWM modes based on the load, ensuring high efficiency throughout the entire load range.

High efficiency PFM/PWM mode

Mixing PWM Mode
An original control method that provides higher efficiency than typical PWM at light loads and prevents unwanted audible noise from being generated during switching, making it ideal for high fidelity audio systems.

Mixing PWM mode

3.High power in a space-saving surface mount package

Typically, two or more ICs or one large IC are required in order to obtain an output current of 2A. However, increasing the size of the IC and/or total board area can become problematic, particularly in portable devices that demand smaller components. The BD1865GWL can deliver 5V/2A output in a compact 1.6mm x 1.6mm package.

Evaluation board

An evaluation board is also available that makes it possible to immediately begin evaluation (please inquire).

Availability: Now

Terminology

  • DC/DC Converter
    A type of power supply IC that converts one DC voltage to another DC voltage (usually lower, although boost converters exist that increase the voltage).
  • PWM (Pulse Width Modulation)
    The most common voltage control method. The frequency is constant, making it easy to predict the amount of noise generated and implement countermeasures (i.e. filters).
  • PFM (Pulse Frequency Modulation)
    Another type of voltage control method, used to reduce switching loss at light loads.

About ROHM Semiconductor
ROHM Semiconductor is a global company of 362,772 million yen (3,30 billion US$) revenue with 20,843 employees in the last fiscal year ending March 2015. ROHM Semiconductor develops and manufactures a very large product range from the Ultra Low Power Microcontroller, Power Management, Standard ICs, SiC Diodes, Mosfets and Modules, Power Transistors and Diodes, LEDs to passives components such as Resistors, Tantalum Capacitors and LED display units, thermal Printheads in state-of-the-art manufacturing plants in Japan, Korea, Malaysia, Thailand, the Philippines, China and Europe.

LAPIS Semiconductor (former OKI Semiconductor), SiCrystal AG and Kionix are companies of ROHM Group.

ROHM Semiconductor Europe has its head office near Dusseldorf serving the EMEA region (Europe, Middle East and Africa). For further information please contact www.rohm.com/eu

 

VN:F [1.9.17_1161]
Rating: 0.0/6 (0 votes cast)

This post was written by:

- who has written 74 posts on PowerGuru - Power Electronics Information Portal.


Contact the author

Leave a Response

You must be logged in to post a comment.