Texas Instruments Debuts TPS65800 Power Conversion IC
Texas Instruments Inc. (TI, Dallas, TX) debuted a new high-performance power conversion integrated circuit (IC) with "smart charging" capability, the TPS65800, which incorporates power transistors onto a single device. Occupying up to 70 percent less board space versus discrete solutions, the programmable chip delivers high dc-dc conversion efficiency and battery management to one-cell, lithium-ion (Li-Ion)-powered communications and multimedia devices with multiple voltages, such as smart phones, portable audio and media players, satellite radio, and global positioning systems.
The new TPS65800 power management unit integrates several power control building blocks, including two synchronous step-down dc-dc converters with integrated FETs, one boost dc-dc converter for white LED display backlights, an RGB LED driver, seven linear regulators, a high-performance analog-to-digital data converter, SIM card and RTC power supplies, and an I2C communications interface that allows full programmability of the TPS65800. In addition to the power regulation blocks, the device applies TI's patented linear charge and system power path management technology for Li-ion batteries using integrated charge FETs.
To conserve battery power, the dc-dc switch-mode converters support greater than 90 percent efficiency over a wide range of load currents, while deploying pulse frequency modulation at light-load conditions. Two buck converters drive up to 600 mA for core and I/O requirements, and the boost converter illuminates up to six white LEDs in series. Three of the seven low-dropout voltage regulators feature low noise and high power supply rejection ratio for RF and audio supplies. Additional regulators manage the voltage levels to a SIM data card used in wireless systems and a backup supply for a real-time clock. Dynamic power path management allows the TPS65800 to power the system while independently charging a one-cell Li-ion battery from either a USB or ac-dc wall adapter power source, without adding any external power components. This feature reduces the charge and discharge cycles on the battery, allowing for proper charge termination and system operation with an absent or defective battery pack. In addition, the system can instantaneously turn on from an external power source in the case of a deeply discharged battery pack.
The TPS68500 features a serial interface, which is compatible with the standard and fast-mode I2C specifications, allowing data transfers at up to 400 kHz. The interface adds flexibility to the power supply solution and enables instant programmability reacting to changing system requirements. The device's integrated 10-bit analog-to-digital converter can be used for battery-monitoring purposes, while three programmable, general-purpose I/O channels control other functions in the system.
The TPS65800 is currently sampling and is scheduled to be available in volume production later this year. The TPS65800 comes in a 56-pin, 8 mm x 8 mm QFN package, and is priced at $6.50 each in quantities of 1,000 units.
