描述 Description

The HX8001 is high efficiency, fixed frequency, Buck-Boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The devices are suitable for single lithium-ion, multicell alkaline or NiMH applications where the output voltage is within the battery voltage range.

The switching frequencies up to 1.5 MHz could be fixed by an external resistor. Also the oscillator could be synchronized to an external clock. The quiescent current is 1mA which maximizes the battery life in portable applications.

Other features include a 1μA shutdown, thermal shutdown and current limit. The HX8001 is available in the 10-pin thermally enhanced MSOP package (or upon request).

特性 Features

· Synchronous Rectification up to 95% Efficiency

· Single Inductor

· Fixed Frequency Operation with Battery Voltages Above, Below or Equal to the Output

· Quiescent Current: 1mA (50μA low power mode: mode pin high)

· Continuous Output Current up to 1A

· Input Voltage Range: 1.8V to 5.5V

· Programmable Oscillator Frequency from 350kHz to 1.5MHz

· No Schottky Diodes Required (VOUT < 4.3V)

· VOUT Disconnected from VIN During Shutdown

· Shutdown Current: <1μA

· Small Thermally Enhanced 8-pin SOP Package

應(yīng)用 Application

· Handheld Instruments

· MP3/MP4 Players

· Palmtop computers

· Digital Cameras