Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: TPS6420x
Edited by the Electronicstalk Editorial Team on 19 September 2003
High-efficiency controllers save battery life
A new family of nonsynchronous DC/DC step-down controllers features low quiescent current and up to 95% power efficiency
The tiny controllers help conserve battery life in battery-powered applications with input voltages between 1.8 and 6.5V that must be stepped down to a regulated voltage to 1.2V and provide output currents from 1 to 3A. The new devices are ideal for applications such as PDAs, digital cameras, notebooks and medical and industrial appliances.
This article was originally published on Electronicstalk on 19 September 2003 at 8.00am (UK)
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TI's TPS6420x family of step-down controllers feature a quiescent current of only 20uA and drive an external P-channel mosfet, which allows for added design flexibility with the application's output current.
The controllers are ideally suited for systems powered from a 5 or 3.3V bus or for battery-powered applications using a single-cell lithium-ion (Li-ion) battery or two- to four-cell alkaline, nickel metal-hydride (NiMH) or nickel cadmium (NiCd) batteries.
The TPS6420x controllers achieve highest efficiency over a wide range offload current by using a minimum on-time and off-time control scheme.
The minimum on time of typical 600ns allows the use of small inductors and capacitors.
When disabled, the current consumption is reduced to less than 1uA.
Additional features include: adjustable and fixed voltage options from 1.2V to the input voltage level; 100% maximum duty cycle for lowest dropout; high efficiency at light load currents; internal soft-start; and overcurrent protection.
The TPS6420x devices are available today in volume from TI and its authorized distributors.
The DC/DC controllers come in a six-pin SOT-23 (DBV) package, and are priced in quantities of 1000 at $0.50 per unit.
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