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LM1770

Texas Instruments
Part Number LM1770
Manufacturer Texas Instruments
Description Low-Voltage SOT-23 Synchronous Buck Controller
Published Nov 25, 2022
Detailed Description LM1770 www.ti.com SNVS403C – SEPTEMBER 2005 – REVISED APRIL 2013 LM1770 Low-Voltage SOT-23 Synchronous Buck Controlle...
Datasheet PDF File LM1770 PDF File

LM1770
LM1770


Overview
LM1770 www.
ti.
com SNVS403C – SEPTEMBER 2005 – REVISED APRIL 2013 LM1770 Low-Voltage SOT-23 Synchronous Buck Controller With No External Compensation Check for Samples: LM1770 FEATURES 1 •2 Input Voltage Range of 2.
8V to 5.
5V • 0.
8V Reference Voltage • No Compensation Required • Constant Frequency Across Input Range • Low Quiescent Current of 400µA • Internal Soft-start • Short Circuit Protection • 5-Pin SOT-23 Package APPLICATIONS • Simple To Design, High Efficiency Step Down Switching Regulators • Set-Top Boxes • Cable Modems • Printers • Digital Video Recorders • Servers DESCRIPTION The LM1770 is an efficient synchronous buck switching controller in a tiny SOT-23 package.
The constant on-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space.
It also incorporates a unique input feed-forward to maintain a constant frequency independent of the input voltage.
The LM1770 is optimized for a low voltage input range of 2.
8V to 5.
5V and can provide an adjustable output as low as 0.
8V.
Driving an external high side PFET and low side NFET it can provide efficiencies as high as 95%.
Three versions of the LM1770 are available depending on the switching frequency desired for the application.
Nominal switching frequencies are in the range of 100kHz to 1000kHz.
Typical Application Circuit VIN VIN HG LM1770 LG VOUT FB GND 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2 PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright © 2005–2013, Texas Instruments Incorporated LM1770 ...


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