آی سی L4978

آی سی L4978

DESCRIPTION

The L4978 is a step down monolithic powerswitching regulator delivering 2A at a voltage between3.3V and 50V (selected by a simple externaldivider). Realized in BCD mixed technology, thedevice uses an internal power D-MOS transistor(with a typical Rdson of 0.25Ω) to obtain very highefficency and high switching speed.A switching frequency up to 300KHz is achievable(the maximum power dissipation of the packagesmust be observed). A wide input voltage range between8V to 55V and output voltages regulatedfrom 3.3V to 50V cover the majority of today’s applications.Features of this new generations of DCDCconverter include pulse-by-pulse current limit,hiccup mode for short circuit protection, voltagefeedforward regulation, soft-start, protectionagainst feedback loop disconnection, inhibit forzero current consumption and thermal shutdown.The device is available in plastic dual in line, DIP-8 for standard assembly, and SO16W for SMD assembly.

 Features

• UP TO 2A STEP DOWN CONVERTER
• OPERATING INPUT VOLTAGE FROM 8V TO55V
• PRECISE 3.3V (±1%) INTERNALREFERENCE VOLTAGE
• OUTPUT VOLTAGE ADJUSTABLE FROM3.3V TO 50V
• SWITCHING FREQUENCY ADJUSTABLE UPTO 300KHz
• VOLTAGE FEEDFORWARD
• ZERO LOAD CURRENT OPERATION
• INTERNAL CURRENT LIMITING (PULSEBYPULSEAND HICCUP MODE)
• INHIBIT FOR ZERO CURRENTCONSUMPTION
• PROTECTION AGAINST FEEDBACKDISCONNECTION
• THERMAL SHUTDOWN
• SOFT START FUNCTION

کاتالوگ محصول : دیتاشیت آی سی L4978