The Industry’s First Dual-Mode Battery Charge ICs

Enables simultaneous USB PD and wireless charging utilizing the latest standards

115_imageROHM has recently announced the availability of dual-input boost-buck charging ICs that support 1 to 4 battery cells for notebook PCs, smartphones, and power banks that utilize the latest charging technologies such as wireless and USB Power Delivery (USBPD).

The BD99954GW/MUV generates a charging voltage from 3.07 to 19.2V for 1 to 4 cells through boost-buck control for USBPD. In addition, the industry’s first dual-input charging system automatically switches charging operation without an MCU using an original built-in charging adapter function. And support is provided for both USBPD and USB BC 1.2. This facilitates configuration of dual-mode systems capable of simultaneous charging via USBPD, wirelessly, or from an AC adapter.

115_imageA growing number of portable devices, including notebook PCs, are adopting the USB Type-C PD standard that can charge up to 100W, providing a common charging platform. At the same time wireless charging is gaining traction, increasing the demand to support both charging methods. However, in order to deliver a wide power supply range required by USBPD, a boost function must be added to the system to charge 2-cell (~8.4V) batteries from conventional 5V chargers. Also, enabling two different charging methods to operate at the same time requires mounting charge ICs along with peripheral components as well as an MCU to control charge switching, presenting a significant barrier to introduction.

In response, combining its USBPD IC with proprietary semiconductor technologies allowed ROHM to meet these needs and develop dual-input charging ICs that support both USBPD and wireless protocols in a single package.

Key Features

The BD99954GW and BD99954MWV provide the following 2 features that make it easy to configure a wireless charging environment

  1. 115_imageFacilitates configuration of the industry’s first simultaneous dual-mode charging system–To support the 2 predominant charging methods for the latest portable devices, ROHM developed the industry’s first 2-input charging system. A built-in charging adapter discrimination function enables automatic switching between modes without an MCU. This eliminates the need to mount and adjust external peripheral components such as transistors and resistors typically necessary for each charging system (for charge path switching and backflow prevention), significantly reducing both mounting area and design load.
    1. Supports the latest USBPD standards through boost-buck control

    Step-up/down control makes it possible to generate the charging voltages necessary for USBPD operation (5V to 20V). For example, when charging a 2-cell battery (~8.4V), boost-buck control enables step-down operation from 20V to 8.4V as well as step-up from 5V to 8.4V.

    In addition, compliance with the popular USB BC1.2 and USBPD standards provides support for both conventional USB and the newest USB PD charging protocols.

     

    Lineup

    Part No. No. of Inputs Supply Voltage Range Charge Voltage Range Switching Frequency Operating Temp. Range Package
    BD99954GW 2ch 3.8 to 25V 3.07 to 19.2V 600 to 1200KHz -30 to 85°C UCSP55M3C2.6mm x 3.0mm x 0.62mm
    BD99954MWV UQFN040V50505.0mm x 5.0mm x 1.0mm

    115_imageEvaluation Board

    Sales Start Date:             October 2017

    Online Distributors:    Chip One Stop, Zaiko Store, RS Components

    Evaluation Board P/N:  BD99954MWV-EVK-101

    Support Page:                http://www.rohm.com/web/in/support/battery-charger

    Applications

    ■ Notebook PCs                     ■ Tablets PCs              ■ Smartphones

    ■ Portable Batteries     ■ Wireless Audio         ■ <100W Portable Battery-Equipped Devices

    Pricing: 500yen/pc. (excluding tax)

    Availability: October 2017 (samples), January 2018 (OEM quantities) [Available for purchase through online distributors Chip One Stop, Zyco Store (Core Staff), and RS Components

    Terminology

    USB Power Delivery (USBPD), USB BC1.2

    Power standards established and promoted by the USB Implementer Forum, Inc. (USB-IF). USBPD is the newest standard that enables power supply up to 100W (20V/5A), whereas USB BC 1.2 is the conventional standard specifying power supply up to 7.5W (5V/1.5A). ROHM offers control ICs for USBPD.

    Wireless Charging

    Technology that is quickly attracting attention due to the ability to charge without the need for a power cord, improving device connector resistance to water and dust while providing greater convenience by enabling a single power supply to charge multiple different devices. Portable devices that support wireless charging can be charged by simply placing the device on a charging stand/pad (or moving it close to the charger).


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