Part # LM1770 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM1770 Low-Voltage SOT23 Synchronous Buck Controller With No External Compensation


Part Details:

LM1770 July 2006 Low-V LM1770Low-Voltage SOT23 Synchronous Buck Controller With oltage No External CompensationGeneral Description Features The LM1770 is an efficient synchronous buck switching con- n Input voltage range of 2.8V to 5.5V SOT23 troller in a tiny SOT23 package. The constant on-time control n 0.8V reference voltage scheme provides a simple design free of compensation com- n No compensation required ponents, allowing minimal component count and board n Constant frequency across input range space. It also incorporates a unique input feed-forward to n Low quiescent current of 400µA maintain a constant frequency independent of the input volt- n Internal soft-start Synchronous age. The LM1770 is optimized for a low voltage input rangeof 2.8V to 5.5V and can provide an adjustable output as low n Short circuit protection as 0.8V. Driving an external high side PFET and low side n Tiny SOT-23 package NFET it can provide efficiencies as high as 95%. Three versions of the LM1770 are available depending on Applications the switching frequency desired for the application. Nominal n Simple To Design, High Efficiency Step Down Switching switching frequencies are in the range of 100kHz to Regulators 1000kHz. n Set-Top Boxes n Cable Modems Buck n Printers n Digital Video Recorders n Servers Controller Typical Application Circuit With No External Compensation 20166201 © 2006 National Semiconductor Corporation DS201662 www.national.com Connection Diagram LM1770 Top View 20166202 SOT23-5 Package


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LM1770.pdf Datasheet