The Industry's First Dual-Mode Battery Charge ICs

Provides support for multiple inputs, including conventional USB, the latest USB PD, and wireless charging

ROHM USB PD BD99954GW

ROHM has recently announced the availability of dual-input buck-boost charging ICs that support batteries with 1- to 4-cell configurations for notebook PCs, tablets, power banks and any battery-powered applications that utilize the latest charging technologies, such as wireless and USB Power Delivery (USB PD).

The BD99954GW/MUV delivers an output voltage between 3.07 and 19.2V to support 1-to-4-cell batteries through a buck-boost DCDC controller. On the input side, support for voltages between 3.8V and 25V is provided, covering the voltage range (5V to 20V) defined by USB PD. In addition, the industry's first dual-input charging system can autonomously select from two inputs without an MCU and provide the necessary voltage and current to charge the battery. The IC is also compatible with both USBPD and USB BC 1.2, facilitating configuration of dual-mode systems capable of simultaneous charging via USBPD, wirelessly, or from legacy USB adapters.

BD99954 Advantages

A growing number of portable devices, including notebook PCs, are adopting the USB Type-C PD standard that can provide up to 100W of power, providing a common power delivery 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) and larger batteries from conventional 5V adapters. Also, enabling two different charging methods to operate at the same time usually requires mounting charger 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 multiple power input sources.

Key Features

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

BD99954 Advantages

1. Facilitates 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.

2. 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 85ºC UCSP55M3C
2.6 x 3.0 x 0.62(mm)
BD99954MWV UQFN040V5050
5.0 x 5.0 x 1.0(mm)

Evaluation Board

Sales Start Date: October 2017
Online Distributors: Chip One Stop, Zaiko Store, RS Components
Evaluation Board P/N: BD99954MWV-EVK-101
Support Page: www.rohm.com/web/global/support/battery-charger

BD9995MWV-EVK-101 Evaluatino Board

Applications

  • Notebook PCs
  • Tablets PCs
  • Smartphones
  • Portable Batteries
  • Wireless Audio
  • <100W Portable Battery-Equipped Devices

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).