描述 Description

NCP1422 is a monolithic micropower high frequency step-up switching converter IC specifically designed for battery-operated hand-held electronic products up to 800mA loading. It integrates Sync-Rect to improve efficiency and to eliminate the external Schottky Diode. High switching frequency (up to 1.2 MHz) allows for a low profile, small-sized inductor and output capacitor to be used. When the device is disabled, the internal conduction path from LX or BAT to OUT is fully blocked and the OUT pin is isolated from the battery. This True-Cutoff function reduce the shutdown current to typically only 50nA. Ring-Killer is also integrated to eliminate the high-frequency ringing in discontinuous conduction mode. In addition to the above, Low-Battery Detector, Logic-Controlled Shutdown, Cycle-by-Cycle Current Limit and Thermal Shutdown provide value-added features for various battery-operated applications. With all these functions ON, the quiescent supply current is typical only8.5 uA. This device is available in compact and low profile DFN10 package.

特性 Features

? Output Current up to 800 mA at VIN = 2.5 V and VOUT = 3.3 V
? High Switching Frequency, up to 1.2MHz
? Anti-Ringing Ring-Killer for Discontinuous Conduction Mode
? Low Quiescent Current of 8.5 μA
? 1.0V Startup at No Load Guaranteed
? Output Voltage from 1.5V to 5V Adjustable
? 1.5A Cycle by Cycle Current Limit
? On Chip Thermal Shutdown with Hysteresis
? Housed in Space-Saving and Low Profile DFN10 package
? Pb-Free Package is Available

應(yīng)用 Application

? Personal Digital Assistants (PDA)
? Handheld Digital Audio Products
? Camcorders and Digital Still Cameras
? Conversion from one to two Alkaline, NiMH, NiCd battery cells to 3.0-5.0V or one Lithium-ion cells to 5.0V
? While LED Flash for Digital Cameras

簡介

NCP1422屬于開發(fā)板套件編程器的評估板-LED驅(qū)動器。由制造生產(chǎn)的NCP1422評估板 - LED 驅(qū)動器LED 驅(qū)動器評估板是帶有元器件的電路板，用于提供特定電路或器件的工作實例。該系列評估板提供一個 LED 驅(qū)動器實例，用于可調(diào)節(jié)閃爍、模擬亮度、背光、雙極開關(guān)、升壓轉(zhuǎn)換器、亮度控制、相機閃光燈、可調(diào)光、恒流和 RGB 控制，以及更多其他應(yīng)用。