LM1572  Product Folder

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.

• 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 package

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