The TD220/221 is a single-chip power management IC with three integrated functions: low-voltage voltage regulator, switching charge pump and power MOS driver. It is designed for industrial applications.
The document provides a simple functional description of the TD220/221, which is a standard circuit designed with industrial applications in mind. It integrates three block functions—voltage regulation, power supply, and power MOS driver—in a single SO8 package.
In typical applications, the device manages the MOSFET gate driver, provides a 3.3 V or 5 V supply for microcontrollers (depending on the specific model), and regulates the power supply voltage at 13 V using an integrated Two-Point Regulator.
The circuit turns on when the voltage reaches 14.1 V and turns off when it drops below 8.2 V.
The Vreg block provides a precise output voltage at 3.3 V with an accuracy of +3%.
The Clamp block ensures that the maximum Vcc does not exceed 22 V.