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TI Introduces 95 Percent Efficient Step-Down Controllers with Ultra-Low Quiescent Current in a Small SOT-23

New DC/DC Controllers Conserve Battery Life and Board Space in Cost-Sensitive Applications

Sep 16, 2003

DALLAS (Sept. 16, 2003) -- Texas Instruments Incorporated (TI) (NYSE: TXN) announced today a family of non-synchronous DC/DC step-down controllers with low quiescent current and up to 95 percent power efficiency. The tiny controllers help conserve battery life in battery-powered applications with input voltages between 1.8 V and 6.5 V that must be stepped down to a regulated voltage to 1.2 V and provide output currents from 1 A to 3 A. The new devices are ideal for applications such as personal digital assistants (PDAs), digital cameras, notebooks and medical and industrial appliances. (See: power.ti.com/sc03186.) 


TI´s TPS6420x family of step-down controllers feature a quiescent current of only 20 µA 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-V or 3.3-V 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 600 nanoseconds (ns) allows the use of small inductors and capacitors. When disabled, the current consumption is reduced to less than 1 µA. 

Additional Features

  • Adjustable and Fixed Voltage Options from 1.2 V to Vin 
  • 100 Percent Maximum Duty Cycle for Lowest Drop-out 
  • High Efficiency at Light Load Currents 
  • Internal Soft-Start 
  • Over-Current Protection

Pricing and Availability

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 1,000 at $0.50 per unit. Evaluation modules of the TPS64200 are available in less than 24 hours through power.ti.com.