Application note AN2115 from STMicroelectronics describes the L6928, a high efficiency monolithic synchronous step-down regulator capable of delivering up to 800 mA at output voltages from 0.6 V to Vi. The document explains the device pins, block diagram, light-load modes, loop stability, short-circuit protection, synchronization and adjustable output voltage.
It also gives application information for selecting input and output capacitors, inductors and compensation networks, discusses conduction, switching and gate-charge losses, and presents the demonstration board schematic, efficiency results and application ideas including buck-boost and white LED driving.
| Output current | Up to 800 mA |
|---|---|
| Input voltage range | 2 V to 5.5 V |
| Output voltage range | 0.6 V to Vi |
| Switching frequency | 1.4 MHz internal |
| Synchronization range | 1 MHz to 2 MHz |
| Quiescent current | 25 µA |
| Shutdown current | 0.2 µA |
| Internal reference voltage | 0.6 V typ. |
| Package | MSOP8 |
| Control architecture | Constant frequency peak current mode |
It is a high efficiency monolithic synchronous step-down regulator capable of delivering up to 800 mA.
The operating input voltage ranges from 2 V to 5.5 V.
The switching frequency is internally set at 1.4 MHz.