This application note introduces L497XA series of high current switching regulator ICs, which exploit Multipower-BCD technology to achieve very high output currents with low power dissipation
The document provides an in-depth analysis of the L497XA family of high current switching regulator ICs, which utilize Multipower-BCD technology. It details the vertical DMOS silicon gate process that allows for mixing Bipolar and CMOS transistors with power components on a single chip.
The text focuses specifically on the step-down configuration, explaining the circuit operation through simplified block diagrams and principal waveforms. It derives mathematical expressions for calculating key parameters such as ON/OFF times, current ripple, output voltage, efficiency, and component values like inductance (L) and capacitance (C).
| Output Current (Multiwatt package) | up to 10A |
|---|---|
| Output Current (DIP package) | 3.5A |
The L497XA series exploits Multipower-BCD technology to achieve high output currents with low power dissipation.
If the regulator does not respect the lovin 2 IL/2 relationship, it starts operating in discontinuous mode, which may cause variations in switching frequency and decrease output regulation.