The world's well-known semiconductor manufacturer has developed a small, efficient, high-efficiency, high-efficiency, high-efficiency DC / DC converter * 1 "BD1865GWL", which is ideal for single-segment lithium-ion battery such as smartphones and tablets, USB Pins and HDMI pins mobile devices.
"BD1865GWL" is directed to a mobile device that requires miniaturization, battery life, using RoHM's simulation design technology advantage, so that the operating voltage of the operating voltage at the time of battery discharge is as low as 2.7V, and the battery drive time is more than the general lower limit 2.7V product. long. In addition, the product is equipped with PFM / PWM * 2 mode and ROHM's unique Mixing PWM mode. When selecting PFM / PWM mode, the entire load range can achieve high efficiency of 90%; when selecting Mixing PWM mode When it is possible to prevent the ringing noise caused by the switch noise worried in the sound application. Not only that, only 1 1.6 x 1.6mm small IC can deal with up to 2A output current, which is very helpful to apply the equipment miniaturization.
This product has been put into mass production by 500,000 sizes from December 2015 (sample price 200 yen / one: excluding tax). The production base of the early process is ROHM Bin Song Co., Ltd. (Japan Shizuoka), the production base of the later process is ROHM APOLLO Co., Ltd. (Fukuoka Prefecture, Japan).
Smartphones and tablets are used to use a lithium ion battery with a output voltage of 4.2V. However, these products are equipped with more USB, HDMI and audio speakers working with 5V, so must work these features, boosting the battery output voltage to 5V boost DC / DC converter is not Less. In addition, mobile devices require miniaturization and longer battery life, so each component can be further miniaturized and efficient.
However, the past 5V output boost DC / DC converter is not all capable of meeting small, efficient, low voltage work, and supports high-standard products for large currents.
1. Realize the lower limit 2.5V voltage driver, helps the battery life
As the battery remaining, the output voltage of the battery is gradually decreased by the voltage input to the system. New products use RoHM to accumulate the simulation design technology to accumulate the design technology, and 5V output can be achieved even at input voltages of 2.5V. Support the lower limit 2.5V to make the battery drive time longer than the general product.
2. Two working modes to achieve high efficiency, high performance IC
· PFM / PWM mode
This mode automatically switches PFM and PWM when loaded, so that 90% of high efficiency can be achieved throughout the load range. It is very suitable for use in smartphones and tablets such as frequent operation and efficiency.
· MIXING PWM mode
This mode utilizes ROHM's unique control method to achieve higher efficiency than general PWM modes when light load. Moreover, the audible noise can also be eliminated to prevent ringing, so it is very suitable for the application of sound quality, etc.
3. Implement 5V / 2A high power with small package
It has always been, and there is a problem such as the output current to achieve 2A requires two IC or IC itself dimension. New products require only one 1.6 x 1.6mm small IC to successfully implement the output current of up to 2A (when the output voltage is set to 5V), it is very helpful to the miniaturization of the mobile device.
The company is also equipped with an assessment board that can be easily and easy to evaluate. Please contact us for details.
* 1) DC / DC converter
One of the power supply IC converts the DC (DC) voltage to a DC voltage. It is mainly used to reduce the voltage of a buck type and two types of boosting type used to increase the voltage.
* 2) PWM (Pulse Width Modulation / Pulse Width), PFM (PULSE FREQUENCY MODULATION / Pulse Frequency Modulation)
PWM is one of the general voltage control methods. The frequency is constant, it is easy to predict the resulting noise, so it is easy to adopt a additive measures such as noise.
The PFM is the same as the PWM, and is also one of the voltage control methods, which reduces the switching loss at the light load.
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