Dallas—Texas Instruments' highly functional TPS65800 power IC brings "smart-battery" and power- management technology together on one IC. The programmable chip, which incorporates all essential power transistors, cuts board space requirements by up to 70 percent versus discrete solutions for multivoltage multimedia devices such as smart phones, portable audio and media players, satellite radio, and GPS systems.
"Mobile consumers continue to demand more functionality while maintaining long battery life in smaller designs," said Gregg Lowe, senior vice president of the company's analog group. "Because of its leading analog manufacturing expertise, Texas Instruments is well positioned to integrate its high-performance building blocks to help our mobile handset and electronics customers meet stringent power requirements and get more out of their battery."
The TPS65800, using its dynamic power-path management technology to power the system while independently charging a single-cell lithium-ion battery, integrates two synchronous step-down DC/DC regulators with integrated FETs, a boost DC/DC regulator for white LED display backlight, an RGB LED driver, seven linear regulators (LDOs), a high-performance analog-to-digital data converter, SIM card and RTC power supplies, and an I2C communications interface to facilitate programming.
The DC/DC switchmode regulators boast greater than 90 percent efficiency over a wide range of load currents. They deploy pulse frequency modulation (PFM) during light-load conditions. The two buck regulators deliver up to 600 mA for core and I/O requirements, and the boost regulator illuminates up to six white LEDs in series.
Three of the seven low-dropout voltage regulators (LDO) feature low noise and high power supply rejection ratio (PSRR) for RF and audio supplies. Additional regulators manage the voltage levels to a SIM data card used in wireless systems and a back-up supply for a real-time clock.
The chip can charge the lithium-ion cell from either a USB or AC/DC wall adapter power source—and doesn't require any external power components. This feature reduces the charge and discharge cycles, allowing for proper charge termination and system operation with an absent or defective battery pack.
The TPS68500's serial interface, which is compatible with the standard and fast-mode I2C specifications, allow data transfers at up to 400 kHz. The device’s integrated 10-bit A/D converter can be used for battery monitoring purposes, while three programmable general purpose I/O channels can be used to control other functions. For efficient charging, the chip intelligently charges the battery and accurately measures its capacity. Switchmode power conversion translates the battery power as efficiently as possible to supply system components. The chip, using the company's SmartReflex technology, also analyzes and manages power consumption in the processor domain while adaptively controlling the power supply through software.
The device datasheet can be secured by clicking here. The TPS65800 is currently sampling and is scheduled to be available in volume production later this year. The TPS65800 power management unit, in a 56-pin, 8-by-8 mm QFN package, is priced at $6.50 each in 1k quantities. Evaluation modules, application notes, and the company's online power management product selection tool are available through power.ti.com
Texas Instruments, 1-800-477-8924, www.ti.com