GStek
High Performance Single Synchronous Buck Converter
Package Type: TQFN23-4x4
The GS9221 is small size chip with a relative constant on-time synchronous buck switching converter suitable for applications in notebook computers and other battery operated portable devices. Features include wide input voltage range, high efficiency and fast dynamic response The GS9221 has a unique power save mode, which can save battery power supply by decreasing frequency when load current falls down below preset critical current point. The fast dynamic transient response means that buck converter applications based on GS9221 will provide about 100ns-order response to load when output voltage falls down or rises up. The frequency will increase or decrease to meet the change in output load. Moreover, the GS9221 will take the same method to regulate the output voltage when input voltage changes. When transient response regulated, the converter will maintain a new steady-state operation. Both the transient response state and the new state, the GS9221 always has the same on-time width. The GS9221 is suitable for the solutions which the output voltage is between 0.6V and12V. An external setting resistor and output voltage can set the on-time width and frequency for the converter. Additional features include current limit, soft-start, over-voltage and under-voltage protection, a Power Good flag and soft discharge upon shutdown. The GS9221 is available in package TQFN23-4x4.
Data sheet
