DC/DC controller connects power modules for increased load handling

Dallas, Tex. — Texas Instruments Inc. has introduced a single-channel version of its TPS40K stackable controller family that converts power supplies in data centers and telecommunications equipment into fully scalable, interleaved power systems with increased load handling and higher efficiency. TI says it's the first of its kind for high-density blade servers.

The TPS40180 synchronous DC/DC controller allows a system designer to connect or “stack” together multiple power modules, resulting in a high-density power supply that supports 10 A to 200 A of output current. Based on the TPS40140 dual-phase controller, the single-channel version provides greater design flexibility when additional circuitry or daughtercards are added to the board particularly when the dual-phase capabilities of the TPS40140 are not needed, said TI.

The TPS40180 device supports a wide input voltage conversion range of 2 V to 40 V, and operates from a 4.5-V to 15-V power source. The device converts from 15-V input to 0.7-V output at a programmable switching frequency of 1-MHz per phase, resulting in a ripple frequency of up to 8 MHz at the input and output during operation. The TPS40180 also offers line and load regulation of 0.1 percent, supported by a high-precision ±0.5 percent, 0.7-V voltage reference and high-accuracy differential load sense amplifier.

The TPS40180 features automatic phase-balancing, which allows a power supply to minimize the ripple current in both the output and input capacitors, and results in an overall smaller solution size, said TI. Designers can also implement topologies where multiple output rails can be synchronized to achieve greater levels of power density and flexibility, while minimizing electromagnetic interference (EMI) system noise. The load share feature enables modular power supply design where modules can be paralleled together, so that each module will deliver power equally to the load, says TI.

The TPS40180 is equipped with complete supervisory and control features including pre-bias start-up capability, programmable under-voltage lockout, lossless direct current resistance or resistor current sensing, power good, soft start control, synchronization input, programmable over-current protection and thermal shutdown. In addition, the TPS40180 controller provides a unique eTrim feature that allows a designer to trim the reference voltage on the device to compensate for external component tolerances. TI says this helps tighten overall system accuracy and specifications for output voltage of the converter.

Pricing: Packaged in a 4 x 4-mm, 24-pin QFN, suggested resale pricing is $1.95 each in quantities of 1,000.
Availability: The TPS40180 controller is available in volume from TI and its authorized distributors.
Product information: Evaluation modules of the TPS40180 and TPS40140, application notes, reference designs and TI's Power Management Selection Guide are available at
Datasheet: TPS40180

Texas Instruments , 1-800-477-8924,

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