The PM6675S device is a high-efficiency step-down controller with an embedded 2 A LDO linear regulator. The constant on-time (COT) architecture assures fast transient response supporting both electrolytic and ceramic output capacitors. An embedded integrator control loop compensates the DC voltage error due to the output ripple. Selectable low-consumption mode allows the highest efficiency over a wide range of load conditions. The low-noise mode sets the minimum switching frequency to 33 kHz for audio-sensitive applications. The LDO linear regulator can sink and source up to 2 Apk. Two fixed current limits (±1 A and ±2 A) can be chosen. An active soft-end is independently performed on both the switching and the linear regulators outputs when disabled.
This document is an application note for the PM6675S, a device combining a high-efficiency step-down controller with an independent low dropout (LDO) linear regulator. The controller features a constant on-time (COT) architecture for fast transient response and supports both electrolytic and ceramic output capacitors. It includes selectable low-consumption modes, a minimum switching frequency of 33 kHz for audio-sensitive applications, and an embedded integrator control loop to compensate for DC voltage error due to output ripple. The embedded LDO can sink and source up to 2 A with selectable current limits of 1 A or 2 A.
| Input voltage range | 4.5 V to 28 V |
|---|---|
| Voltage reference | 0.6 V, +1% |
| Fixed output voltage | 1.5 V |
| Adjustable output voltage | 0.6 V to 3.3 V |
| Soft-start time | 3 ms |
| LDO current limit | 1 A or 2 A |
| Minimum switching frequency | 33 kHz |
The minimum switching frequency is set to 33 kHz for audio-sensitive applications.
Yes, the device supports all ceramic output capacitor applications.
Two fixed current limits of 1 A and 2 A can be chosen.