Power Electronics

DC-DC Controllers Are Cost-Optimized

Four new TPS40K dc-dc buck controllers from Texas Intruments (TI) are low pin-count, cost-optimized devices, used in modular and on-the-board power supplies. They are intended for set-top boxes, disk drives, industrial control, servers and distributed power systems.

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

Power system designers can optimize the TPS40200 for efficiency or solution size by programming the switching frequency from 35 kHz to 500 kHz or the controller can be synchronized via an external clock. An integrated 200 mA FET driver allows the direct drive of small- and medium-size Power FETs.

The TPS40041 synchronous, voltage-mode PWM controller can operate from a 2.25-V to 5.5-V input source and generate an output of 0.59 V at a fixed frequency of 600 kHz. Further reducing pin-count, the buck controller integrates several features, such as soft-start and short-circuit protection. The TPS40041 is offered in a 3-mm x 3-mm 8L SON package.

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

The TPS40190 is a cost-optimized synchronous buck controller with voltage-mode control and adaptive gate drive that operates from a 4.5-V to 15-V input voltage range at a fixed 300 kHz switching frequency. The device integrates a linear regulator, which converts the input voltage to an on-chip 5-V source to power the controller and drivers. In addition, the TPS40190 can generate an adjustable output voltage as low as 0.6 V. The controller also features three levels of overcurrent protection, internal soft start ramp and a dedicated enable pin.

The new TPS40K controllers are available now. Pricing per device in quantities of 1000 units ranges from $0.55 each for the TPS40200 to $0.99 for the TPS40190.

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