描述 Description

General Description
The LM1572 is a 500kHz step-down (buck) switching voltage regulator capable of driving up to 1.5A in to a load while occupying a very small PCB area. Current Mode Control results in superior transient response and regulation over a wider range of operating conditions. National’s advanced analog bipolar, CMOS plus DMOS process enables high efficiency at high switching frequency, and the internal 150m? MOSFET switch provides more power from a smaller package.
The LM1572 has programmable soft-start and frequency foldback to limit the inrush current, and a TTL compatible shutdown for easy sequencing. It draws 2.3mA of supply current in standby mode, and only 26μA in shutdown mode. The LM1572 is available in a TSSOP-16 package with an adjustable output or fixed outputs of 5V and 3.3V. The adjustable version can be set between 2.42V and 5V.

特性 Features

■ 500kHz clock allows small, surface mount components
■ 150m? MOSFET switch
■ Guaranteed load current of 1.5A
■ Current mode control
■ Programmable soft-start
■ Internally set slope compensation
■ TTL compatible shutdown
■ Fixed 5V, 3.3V or adjustable output
■ Low shutdown supply current of 26μA
■ Cycle-by-cycle current limit
■ Short-circuit protection and thermal protection
■ TSSOP-16 packageApplications
■ LCD Monitors and TVs
■ Set-Top Boxes
■ Cable Modems
■ Down conversion from 12V in local/distributed systems

應(yīng)用 Application

■ LCD Monitors and TVs
■ Set-Top Boxes
■ Cable Modems
■ Down conversion from 12V in local/distributed systems