The BD99954GW/MUV generates a charging voltage of 2.56 to 19.2V for 1 to 4 cells via boost-buck control. Furthermore, the industry's first dual-input charging system automatically switches charging operation without requiring an MCU, utilizing a built-in charging adapter function. The device is also compatible with USBPD and USB BC 1.2 standards. This simplifies the configuration of dual-mode systems capable of simultaneous charging via USBPD or an AC adapter.
A growing number of portable devices, including laptops, are adopting the USB Type-C PD standard, which can charge up to 100W, providing a common charging platform. At the same time, wireless charging is gaining traction, increasing the demand for support for both charging methods. However, to supply the wide power range required by USB PD, a boost function must be added to the system to charge 2-cell (~8.4V) batteries from conventional 5V chargers.
In response, ROHM's combination of proprietary semiconductor technologies enabled them to meet these needs and develop dual-input charging ICs that support both USB PD and 5V inputs in a single package.
Key Features
The BD99954GW and BD99954MWV provide the following 2 features that facilitate the configuration of a given charging environment.
1. Facilitates the configuration of the industry's first dual-mode simultaneous charging system.
To support the two predominant charging methods for the latest portable devices, ROHM developed the industry's first 2-input charging system. An integrated charging adapter discrimination function enables automatic switching between modes without an MCU. This eliminates the need to mount external peripheral components such as transistors and resistors typically required for each charging system (for charging path switching and backflow prevention), significantly reducing both the mounting area and design work.
2. Supports the latest USBPD standards via boost/buck control.
Boost/buck control allows the necessary charging voltages for USBPD operation to be generated (5V to 20V). For example, when charging a 2-cell battery (~8.4V), boost/buck control allows for step-down operation from 20V to 8.4V, as well as step-up operation from 5V to 8.4V.
Furthermore, compliance with the popular USB BC1.2 and USBPD standards provides compatibility with both conventional USB charging protocols and the latest USB PD charging protocols.
Program
Download table of specifications here
Evaluation board.
Sales start date: October 2017.
Evaluation board P/N: BD99954MWV-EVK-101.
Support page: http://www.rohm.com/web/global/support/battery-charger
Applications
- Laptops
- Tablets
- Smartphones
- Portable Batteries
- Wireless Audio
- Devices equipped with portable batteries
Availability: October 2017 (samples), January 2018 (OEM quantities)
Terminology
USB Power Delivery (USBPD), USB BC1.2
Power standards established and promoted by the USB Implementer Forum, Inc. (USB-IF). USBPD is the latest standard, allowing power supplies up to 100W (20V/5A), while USB BC 1.2 is the conventional standard, specifying a power supply of up to 7.5W (5V/1.5A). ROHM offers control ICs for USBPD.
