Texas Instruments Debuts TPS61059 Power Conversion IC
Texas Instruments Inc. (TI, Dallas, TX) debuted a new high-power, white light-emitting diode (LED), power conversion chip for next-generation camera phones and personal digital assistants. The TPS61059 single-cell integrated circuit (IC) is optimized to safely and efficiently support up to 800 mA over the input-voltage range of a single-cell, lithium-ion battery. Based on a fixed-frequency, 650 kHz pulse-width modulation (PWM) controller, the device can achieve an 80-percent maximum efficiency. To further maximize battery life, the TPS61059 can be disabled and placed in a shutdown mode where the power is disconnected to the LED, and current consumption reduced to less than 1 µA. Built-in pre-charge and soft-start circuitry prevents excessive current to build during startup.
The company also introduced a new capacitor charger with an integrated IGBT driver for Xenon lamp applications in digital still cameras, the TPS65552A, which occupies only half of the board space versus discrete solutions. The TPS65552A can quickly charge a 50 V capacitor using an optimized PWM control algorithm, and it supports an input voltage from 1.8 V to 12 V, which can be programmed to deliver peak currents of 0.95 A to 1.8 A. The TPS65552A also features a thermal disable monitor, an input signal for charge and flash enable, and an output signal for charge completion status.
In addition, TI unveiled the TPS65520, an integrated, 13-channel, power management IC for digital still cameras that minimizes the number of required external components. The device integrates seven dc-dc converters with integrated Power FETs, a dc-dc controller, and five linear low-dropout regulators. The TPS65520 supports input voltages from 1.5 V to 5 V and features an I2C serial interface for full programmability.
All three power ICs are now available in volume production. The TPS61059 comes in a tiny 10-pin, 3 mm x 3 mm, QFN package, and is priced at $0.95 each in quantities of 1,000 units. The TPS65552A comes in a 10-pin MSOP package and is $1.00 each per 1,000 units. The TPS65520 power management unit for digital cameras comes in an 8 mm x 8 mm BGA package, and is $3.95 per 1,000 units. Evaluation modules, application notes, and TI’s online power management product selection tool are also available.
