Product category:
Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: TPS61059 and TPS65552A
Edited by the Electronicstalk Editorial
Team on 12 October 2005
Power chips boost flash capabilities
Texas Instruments has developed a high-power, white light emitting diode (LED) power conversion chip for next-generation camera phones and PDAs.
Texas Instruments has developed a high-power, white light emitting diode (LED) power conversion chip for next-generation camera phones and PDAs The integrated circuit (IC) will enable brighter flashes and ultimately, better quality pictures
This article was originally published on Electronicstalk on 8 Nov 2004 at 8.00am (UK)
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TI's TPS61059 single-cell white LED driver is optimised to safely and efficiently support up to 800mA over the input voltage range of a single-cell lithium-ion battery.
Based on a fixed frequency of 650kHz pulse width modulation (PWM) controller, the device can achieve an 80% maximum efficiency.
To further maximise 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 1uA.
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Built-in precharge and soft-start circuitry prevents excessive current to build during startup.
Additionally, the LED is safely protected by the TPS61059's open and short-circuit as well as overtemperature protection features.
In addition to the TPS61059 convertor, TI introduced a new photo-flash capacitor charger with integrated IGBT driver for xenon lamp applications in digital still cameras, the TPS65552A.
The device occupies only half of the board space versus discrete solutions, and can quickly charge a 50V capacitor using an optimised PWM control algorithm.
The TPS65552A supports an input voltage from 1.8 to 12V, and can be programmed to deliver peak currents of 0.95 to 1.8A.
It also features a thermal disable monitor, an input signal for charge and flash enable, and an output signal for charge completion status.
TI also introduced the TPS65520, an integrated 13-channel power management IC that meets all power requirements for today's digital still cameras while minimising the number of required external components.
The device integrates seven DC/DC convertors with integrated power FETs, a DC/DC controller and five linear low-dropout (LDO) regulators.
The TPS65520 supports input voltages from 1.5 to 5V and features an I2C serial interface for full programmability - resulting in a highly flexible solution that occupies significant less board space than discrete implementation with similar functionality.
All three power ICs are available in volume production from TI and its authorised distributors.
The TPS61059 comes in a tiny 10-pin, 3 x 3mm QFN package, and is priced at $0.95 each in quantities of 1000 units.
The TPS65552A comes in a 10-pin MSOP package and is $1.00 each per 1000 units.
The TPS65520 power management unit for digital cameras comes in an 8 x 8mm BGA package and is $3.95 per 1000 units.
Evaluation modules, application notes and TI's online power management product selection tool are available.
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