TI Unveils Step-Down DC/DC Controllers for Power Supplies with Wide Input Ranges

4/17/2003 - Expanding its widely adopted TPS40KTM series of power-efficient DC/DC controllers, Texas Instruments Incorporated (TI) (NYSE: TXN) announced two families of synchronous step-down, voltage-mode, DC/DC controllers with the capability of stepping down input voltage ranges from 8 V to 40 V and 10 V to 55 V. The two families of controllers provide added flexibility, power efficiency and ease of use for designers of high-density, 12 V, 24 V and higher bus power supplies for networking, telecom, wireless base stations and computer server applications.

TI's new TPS4005x and TPS4006x lines of buck DC/DC controllers offer various user programmable functions and features to enhance flexibility of design, including closed-loop soft-start, undervoltage lockouts (UVLO), operating frequency, voltage feed-forward and high-side current limit. Programmable, fixed operating frequencies of up to 1 MHz are available with source and source/sink current options.

Available today, the devices supply output voltages down to 0.7 V with a precision reference of better than one percent. The TPS4005x family steps down input voltages ranging from 8 V to 40 V, and drives external N-channel high-side and synchronous rectifier MOSFET output transistors, providing flexibility and efficiency for power supply design. The TPS4006x family can handle input voltages ranging from 10 V to 55 V by driving an external P-channel MOSFET on the high side, while driving an external N-channel MOSFET for the synchronous switch. In addition, the devices' gate drive logic incorporates anti-cross conduction circuitry to prevent simultaneous high-side and synchronous rectification.

Packaging, Pricing, Easy-to-use Design Tools
TIs TPS4005x and TPS4006x DC/DC controllers, which come in a 16-pin thin-shrink small-outline package (TSSOP) PowerPadTM package with thermal protection, are available now from TI and its authorized distributors. Evaluation modules and reference designs will be available in the second quarter at power.ti.com. Suggested resale pricing is $1.19 each in quantities of 10,000. Initial offerings in the family include:

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