Fuel-Gauge ICs Maximize Battery Runtimes for Devices

Maxim Integrated offers the MAX17260 and MAX17261 ModelGauge m5 EZ fuel gauges IC that are well suited for a broad range of Li-ion battery powered applications.  These battery characterization-free solutions provide high levels of accuracy while also offering small size and ease of design.

The MAX17260 and MAX17261, which feature the ModelGauge m5 EZ algorithm, provide a high level of accuracy in fuel gauging compared to competing solutions. This allows designers to maximize their devices’ runtime by preventing premature or sudden device shutdowns, while maintaining a smaller battery size. The fuel gauges, which are housed in an ultra-small 1.5 mm x 1.5 mm package, feature a very low quiescent current of 5.1 µA to minimize draining the battery during long periods of standby time. The products allow designs to be quickly done without battery characterization or calibration.
As devices have become more sophisticated with their feature offerings and increasing power density, designers are now challenged with achieving an enhanced user experience without compromising battery runtimes. There is also a huge market need for highly accurate fuel gauges, as less accuracy may introduce uncertainty that must be compensated with higher battery capacity and larger physical dimensions.

Accurate battery state of charge (SOC) prevents sudden crash and premature device shutdown; Provides easy to understand battery information for end users such as time to empty, time to full under current, as well as hypothetical load conditions; Dynamic power technology enables high system performance without crashing the battery and results in smaller battery size.

The very low quiescent current of 5.1µA of these chips prevent excessive energy loss during long periods of standby time. This battery characterization-free solution offers no battery size limit; MAX17260 offers a high-side Rsense option to simplify ground-plane design; MAX17261 offers a flexible switched resistor divider option to support any number of series cells (multi-cell batteries). The devices support small electronics with 1.5 mm x 1.5 mm wafer-level packaging (WLP) as well as 3 mm x 3 mm TDFN.

The MAX17260 is available for $0.93 (1000-up); MAX17261 is available for $1.22 (1000-up). MAX17260GEVKIT and MAX17261GEVKIT evaluation kits are available for $60.

Maxim Integrated | www.maximintegrated.com

Step-Down Converters Target Always-On Car Systems

Maxim Integrated Products has announced the ultra-compact, pin-compatible MAX20075 and MAX20076 step-down converters that enable system designers looking to create small and highly efficient 40-V load dump-tolerant applications. The MAX20075 and MAX20076 step-down converters offer low quiescent current (IQ) and feature integrated compensation. This enables minimal external components that can lead up to 50% savings in board space making them well-suited for always-on automotive applications.

According to Maxim Integrated, car customers expect always-on applications to bring them experiences richer and more compelling than ever before. However, car system designers are challenged with having to balance delivering advanced features with meeting size constraints, power-saving features and high efficiency.

The MAX20075 and MAX20076 in peak current mode draw just 3.5 µA in the low power operating mode, which is key to meeting the stringent OEM IQ consumption requirements of 100 µA per module. The converters enable low noise operation via pin-controlled spread spectrum and fixed 2.1 MHz operation to meet CISPR 25 Class 5 EMI compliance. Furthermore, added advantage of the 2.1 MHz operation and internal compensation is that it lowers the solution size and the bill of materials (BOM) compared to a non-synchronous device that operates in the AM band.

The MAX20075 and MAX20076 are available with a low minimum on-time mode operation, which allows the converters to support large input-to-output conversion ratios. For example, Vbatt input to Vout of less than 3 V at 2.1 MHz; this translates to not having to use a secondary supply, which reduces overall BOM cost by $0.30 to incorporate new functions into the design for greater flexibility. The MAX20075 and MAX20076 meet AEC-Q100, are available in a 3 mm x 3 mm TDFN package, and operate over the -40°C to +125°C temperature range.

Maxim Integrated | www.maximintegrated.com

Nanopower Comparator

TLV3691The TLV3691 comparator offers a wide supply range, low quiescent current, and rail-to-rail inputs. These features come in industry-standard and extremely small packages, making this device ideal for low-voltage and low-power applications.

Available as a single channel, the comparator’s low power, wide supply, and temperature range make the device flexible enough to handle applications from consumer to industrial. The TLV3691 is available in SC70-5 and 1-mm × 1-mm DFN-6 packages. This device is specified for operation across the –40°C-to-125°C expanded industrial temperature range.

The TLV3691’s features include a 24-µs response time, push-pull output, and a range that extends 100 mV beyond both rails. Texas Instruments offers a variety of tools and resources to speed development with the TLV3691, including a SPICE Model, TINA-TI SPICE Model, and the DIP adapter evaluation module.

Contact Texas Instruments for pricing.

Texas Instruments, Inc.