The LM1771 device is an efficient synchronous buck switching controller with a precision enable requiring no external compensation. The constant ON-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. The precision enable pin allows flexibility in sequencing multiple rails and setting UVLO. The LM1771 also incorporates a unique input feedforward to maintain a constant frequency independent of the input voltage. The LM1771 is optimized for a low-voltage input range of 2.8 V to 5.5 V and can provide an adjustable output as low as 0.8 V. Driving an external high-side PFET and low-side NFET, it can provide efficiencies as high as 95%.
Three versions of the LM1771 are available depending on the switching frequency desired for the application. Nominal switching frequencies are in the range of 100 kHz to 1000 kHz.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM1771 Low-Voltage Synchronous Buck Controller With Precision Enable and No External Compensation datasheet (Rev. D) | PDF | HTML | 08 Jan 2016 |
| Technical article | How to implement voltage monitoring | PDF | HTML | 22 Jul 2015 | |
| EVM User's guide | AN-1477 LM1771 Evaluation Board (Rev. B) | 23 Apr 2013 | ||
| Application note | Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) | 23 Apr 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
| WSON (NGG) | 6 | Ultra Librarian |
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