The LM3489 device is a high-efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost-effective, 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 ultra-low dropout, 100% duty cycle operation. Another benefit is high efficiency operation at light loads without an increase in output ripple. A dedicated enable pin provides a shutdown mode drawing only 7 µA. Leaving the enable pin unconnected defaults to on.
Current limit protection can be implemented by measuring the voltage across the PFET’s RDS(ON), thus eliminating the need for a sense resistor. A sense resistor may be used to improve current limit accuracy if desired. The cycle-by-cycle current limit can be adjusted with a single resistor, ensuring safe operation over a range of output currents.
| Typ | Titel | Datum | ||
|---|---|---|---|---|
| * | Data sheet | LM3489x Hysteretic PFET Buck Controller With Enable Pin datasheet (Rev. C) | PDF | HTML | 16 Dez 2016 |
| White paper | USB Type-C and USB power delivery power path design considerations (Rev. A) | 12 Jun 2019 | ||
| 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 | ||
| User guide | AN-1471 LM3489 Demonstration Board (Rev. A) | 25 Apr 2013 | ||
| Application note | Designing Non-Invert Buck-Boost (Zeta) Cnvrts w/a Buck P-FET Cntrl | 22 Apr 2011 |
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The LM3489 is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, cost effective, switching buck regulator for a wide range of applications. The hysteretic control architecture provides for simple design without any control loop stability (...)
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