News Release
News Release: Sep.07, 2010
Delivering the industry's best (*1) accuracy of the battery fuel gauge detection
at low cost/low power consumption.
Development of the High-accuracy
"Battery Fuel Gauge IC"
| Product Name | Battery Fuel Gauge IC |
|---|---|
| Product Number | LC709201F |
| Sample shipment availability | from September 2010 |
| Production Plan | 1 million units per month |
The SANYO Semiconductor Co., Ltd. has developed the "LC709201F", a battery fuel gauge IC, which accurately detects the remaining power level of 1-cell lithium-ion batteries used in mobile devices. This IC has realized the industry's best accuracy of ±3% for battery fuel gauge ICs with No sense resistor. We will commence shipment of samples of this product from September 2010.
Ordinarily it's necessary for battery fuel gauge detection devices to use a high-accuracy/high-cost "Sense resistor type" external resistor or a low-cost/low-accuracy (generally around ±10%) "No sense resistor type", and an IC combining the advantages of "high accuracy/low cost" was what was needed.
This product is able to reduce a fuel gauge errors by implementing its unique correction technology for measurement value of battery temperature and voltage. Moreover, its power consumption when no current is detected is 15µA, which is about one-quarter lower than that of our competitor's equivalent products. Thus, with the low consumption, an impact on battery duration is significantly minimized.
Features
- Delivering the industry's leading (*1) accuracy of ±3% (*2) for the battery fuel gauge detection allows high accuracy estimation of the remaining operating time.
- Its power consumption when no current is detected is achieved at "15µA".
- Since a high-cost external resistor for current detection is not required, both set-cost and substrate size are reduced.
*1 This value only applies for battery fuel gauge ICs of the "No sense resistor" type. This data is accurate as of September 7th, 2010.
*2 The battery remaining error was measured at a battery temperature of -10 to 50 degree C and by discharging from 100% to 0%.
Overview
When considering battery-powered mobile devices, being able to accurately measure the remaining battery power level, as well as knowing the most appropriate time for charging, are very important points for stable operation of device and improving ease of use for the users. However, it was a challenge to produce a high-accuracy battery fuel gauge detection device for low to middle-priced mobile devices since pursuing accuracy requires the costs to increase.
Therefore, we have developed the "LC709201F", a battery fuel gauge IC, which is able to accurately estimate the remaining battery power level and indicate the appropriate charge timing by providing the industry's leading accuracy of ±3% for battery fuel gauges. The remaining battery level is generally calculated based on the current flowing through the external resistor (sense resistor) and the battery voltage. Meanwhile, our product takes into account the battery temperature, battery voltage and characteristics of each battery, and calculates the remaining level of power by utilizing our unique correction technology without making use of an external resistor. With this correction technology, we were able to improve the accuracy of remaining levels at low temperature, where the margin of error is usually quite high. Moreover, by returning the measured current value of the mobile device to the device itself during operation, it is possible to calculate the remaining operating time.
This product is ideal for mobile devices such as smart-phones, mobile phones, digital still cameras, digital video cameras, MP3 players, and portable DVD players that are powered by 1-cell lithium-ion batteries or include a battery pack, and require a display to indicate the battery's remaining power levels. This product realizes high-accuracy remaining power level indication at low cost and greatly improves usability in these devices.
Features
- Delivering the industry's leading (*1) accuracy of ±3% (*2) for the battery fuel gauge detection allows high accuracy estimation of the remaining operating time.
This product is able to maintain an remaining error margin of ±3% at even low temperatures by using our unique correction technology, taking into account battery temperature, battery voltage and the characteristic data of each battery. Since no data transfer (wiring) is required from the device, it is possible to produce a high-accuracy battery fuel gauge system with a simple circuit configuration. By knowing how much time is remaining via discharged current value and remaining power levels, instances of sudden flat batteries are reduced, which therefore allows for more efficient operation of the device. - Its power consumption when no current is detected is achieved at "15µA".
Thanks to our unique technology, the industry's best power consumption of "15µA" has been achieved with this product. Its power consumption is 15µA, which is about one-quarter lower than that of competitive equivalent products in the same class. Through our ultra-low power consumption, we are able to extend the battery's operation time and reduce the number of times charged, thereby improving the battery's lifespan. - Since a high-cost external resistor for current detection is not required, both set-cost and substrate size are reduced.
Since using high-cost resistors (sense resistor) for current detection is not required to calculate the remaining battery power level, cost for components is lowered. Wiring and substrate space are also reduced, thus this makes for a reduction of total costs for the unit.
Specifications
| Product Name | LC709201F |
|---|---|
| Operating supply voltage | 2.25 to 5.5 V |
| Current confumption | 15µA (when no current is detected) |
| Operating Temperature | -40 to 85 °C |
| Package | MFP10S(225mil), VCT16(2.6mm×2.6mm) |
*The information presented in this press release, including device specifications, is current as of the date of this press release.
Note, however, that this information is subject to change without notice and thus at later dates the current state may differ in certain details from the content presented here.
