21ic News ROHM, a world-renowned semiconductor manufacturer, has developed a compact, high-efficiency, high-power step-up DC/DC converter *1 "BD1865GWL", which is ideal for single-cell Li-ion battery drives such as smartphones and tablets. A mobile device equipped with a USB pin and an HDMI pin.
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"BD1865GWL" is a mobile device that requires miniaturization and long battery life. It takes advantage of ROHM's analog design technology to make the lower limit of the operating voltage of the battery as low as 2.5V. Compared with the general lower limit of 2.7V, the battery driving time is more. long. In addition, the product is equipped with PFM/PWM *2 mode and ROHM's unique Mixing PWM mode. When PFM/PWM mode is selected, it can achieve high efficiency of 90% over the entire load range; when selecting Mixing PWM mode It can prevent ringing noise caused by switching noise that is of concern in audio applications. Not only that, but a small 1.6x1.6mm IC can handle up to 2A of output current, which is very helpful for miniaturization of applications.
This product has been put into mass production with a monthly capacity of 500,000 units since December 2015 (sample price: 200 yen/piece: excluding tax). The production base of the previous process is ROHM Hamamatsu Co., Ltd. (Shizuoka Prefecture, Japan), and the production base of the later process is ROHM Apollo Co., Ltd. (Fukuoka Prefecture, Japan).
<background>
Smartphones and tablets use a lithium-ion battery with an output voltage of 4.2V when fully charged. However, the USB, HDMI, and audio speakers that are used in these products are operated at 5V. Therefore, in order to make these functions work, the step-up DC/DC converter that boosts the battery output voltage to 5V is indispensable. Less. In addition, mobile devices require miniaturization and longer battery life, and therefore, it is required to further reduce the size and efficiency of each component.
However, the conventional 5V output step-up DC/DC converters are not all high-profile products that can meet small, high-efficiency, low-voltage operation and support large currents.
<New Product Features>
1. Achieve a 2.5V voltage drive at the lower limit, which helps the battery to last longer.
As the remaining battery power becomes less, the output voltage of the battery, that is, the voltage input to the system, gradually decreases. The new product was developed using ROHM's accumulated analog design technology over the years, enabling 5V output even at input voltages as low as 2.5V. Support for the lower limit of 2.5V operation, which can make the battery drive time longer than the average product.
2. Two working modes for high efficiency, high performance IC
・PFM / PWM mode
This mode automatically switches PFM and PWM when the load changes, achieving up to 90% efficiency over the entire load range. It is ideal for applications such as smartphones and tablets that switch frequently and focus on efficiency.
・Mixing PWM mode
This mode utilizes ROHM's unique control method to achieve higher efficiency than the normal PWM mode at light loads. Moreover, it can eliminate audible noise and prevent ringing, so it is very suitable for sound quality applications such as audio equipment.
3. High power of 5V/2A in a small package
In the past, there have been problems in that the output current of 2A requires two ICs or the size of the IC itself is increased. The new product requires only one small 1.6x1.6mm IC to successfully achieve an output current of up to 2A (when the output voltage is set to 5V), which is very helpful for miniaturization of mobile devices.
The company is also equipped with an evaluation board that can be easily and easily evaluated. Please contact us for details.
<term explanation>
*1) DC/DC converter
A type of power IC that converts a direct current (DC) voltage into a direct current voltage. There are two main types of step-down type for reducing voltage and boost type for boosting voltage.
*2) PWM (Pulse Width Modulation), PFM (Pulse Frequency Modulation)
PWM is one of the general voltage control methods. Since the frequency is constant and it is easy to predict the generated noise, it is easy to take countermeasures such as adding a filter to the noise.
PFM is the same as PWM and is one of the voltage control methods to reduce switching losses at light loads.
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