The LM3485 is a high-efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, low-cost, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control-loop stability concerns using a wide variety of external components. The PFET architecture also allows for low component count as well as ultralow dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple.
Current limit protection is provided by measuring the voltage across the RDS(ON) of the PFET, thus eliminating the need for a sense resistor. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3485 Hysteretic PFET Buck Controller datasheet (Rev. H) | PDF | HTML | 28 Dec 2015 |
| Analog Design Journal | Control-Mode Quick Reference Guide (Rev. B) | PDF | HTML | 29 Aug 2023 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Analog Design Journal | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 21 Jul 2016 | ||
| EVM User's guide | AN-1227 LM3485 Evaluation Board (Rev. B) | 25 Apr 2013 | ||
| EVM User's guide | AN-1392 LM3485 LED Demo Board (Rev. B) | 25 Apr 2013 |
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Hysteretic PFET Buck Controller
The LM3485 LED driver board is a buck regulator derived controlled current source designed to drive high power, high brightness LEDs (HBLEDs) such as the Luxeon™ Emitter at dissipations of 1W to 5W. The board can accept an input voltage ranging from 5V to 30V and can control the output current (...)
| Package | Pins | Download |
|---|---|---|
| VSSOP (DGK) | 8 | View options |
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