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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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM1770 Low-V SOT23 Synch Buck Cntrr w/No Ext Compensation datasheet (Rev. C) | 03 Apr 2013 | |
| EVM User's guide | AN-1400 LM1770 Evaluation Board (Rev. B) | 23 Apr 2013 | ||
| Application note | AN-1414 LM1770 Design Reference (Rev. A) | 23 Apr 2013 | ||
| Application note | Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) | 23 Apr 2013 | ||
| Application note | Advanced Topics in Powering FPGAs | 22 Mar 2007 |
For additional terms or required resources, click any title below to view the detail page where available.
| Package | Pins | Download |
|---|---|---|
| SOT-23 (DBV) | 5 | View options |
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