The PM6680A is a dual step-down controller from STMicroelectronics that provides up to 98% conversion efficiency. It uses a constant on-time architecture to ensure fast load transient response and an embedded voltage feed-forward to provide nearly constant switching frequency operation. An embedded integrator control loop compensates for output ripple-induced DC voltage error. Pulse skip technology increases efficiency at very light loads. Additionally, a minimum switching frequency of 33kHz is selectable to avoid audio noise issues. The PM6680A provides a selectable switching frequency, allowing selection between 1.5MHz, 2.5MHz, and 4MHz.
The PM6680A is a dual synchronous step-down controller designed to provide high-efficiency DC/DC conversion with lossless current sensing. It features adjustable output voltages for two independent switching sections and includes an internal 5V LDO capable of delivering 100 mA peak current. The device supports selectable pulse skipping and a minimum switching frequency of 33 kHz to improve efficiency at light loads and avoid audio noise.
| Input voltage range | 6 V to 36 V |
|---|---|
| LDO output current | 100 mA peak |
| Reference voltage | 1.237 V |
| Package type | VFQFPN-32 5X5 |
| Power dissipation | 2.8 W |
Output voltages OUT1 and OUT2 can be adjusted using resistive voltage dividers connected to the FB pins.
The soft-start time is internally fixed at 2ms.