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TI DC/DC buck controllers simplify power design

Posted: 16 Mar 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Texas Instruments? TPS40K? DC/DC buck controller?

Texas Instruments Inc. (TI) announced four new TPS40K DC/DC buck controllers that promise to simplify power design in STBs, disk drives, industrial control, servers and distributed power systems.

The TPS40200 non-synchronous PWM buck controller features an input range of 4.5V to 52V with an output voltage that can be adjusted down to 0.7V. This device features voltage-mode control with voltage feed forward, which helps to simplify compensation design as input voltage varies over the entire input range. Packaged in a low-pin 8L SOIC, the device supports control and protection features needed in today's power supplies, such as under voltage lockout, programmable closed loop soft start and short circuit protection.

The TPS40041 synchronous, voltage-mode PWM controller can operate from a 2.25V to 5.5V input source and generate output of 0.59V at a fixed frequency of 600kHz. Further reducing pin-count, said TI, this buck controller integrates several features, such as soft-start and short-circuit protection. The TPS40041 in a 3-by-3mm 8L SON package allows designers to implement very small point-of-load power supplies without sacrificing performance.

The TPS40222, a 1.25MHz non-synchronous device with integrated high side FET, comes in a tiny 3-by-3mm, 6 pin SON package and can operate from a 4.5V to 8V input source. Additionally, the controller's output voltage can be adjusted as low as 0.8 V. Its high frequency operation allows for the smallest power supply form factor. The TPS40222 implements current mode control and a pulse by pulse current limiting feature with frequency foldback to protect the output during fault conditions.

TI also introduced its new TPS40190 cost-optimized synchronous buck controller with voltage-mode control and adaptive gate drive that operates from a 4.5V to 15V input voltage range at a fixed 300kHz switching frequency. The device integrates a linear regulator, which converts the input voltage to an on-chip 5V source to power the controller and drivers. In addition, the TPS40190 can generate an adjustable output voltage as low as 0.6V, making it suitable for cost-sensitive applications that convert from 5V bus, intermediate bus or 12V bus standards. The controller also features three levels of on-chip, over-current protection, internal soft start ramp and a dedicated enable pin.

Pricing per device in quantities of 1,000 units begins at 55 cents each.

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