Description
The GS9219 is a small-size chip with a relatively constant on-time synchronous buck-switching converter suitable for applications in notebook computers and other battery-operated portable devices. Features include a wide input voltage range, high efficiency, and fast dynamic response The GS9219 has a unique power save mode, which can save battery power supply by decreasing frequency when load current falls down below the preset critical current point.
The fast dynamic transient response means that buck converter applications based on GS9219 will provide about the 100ns-order response to load when the output voltage falls down or rises up. The frequency will increase or decrease to meet the change in the output load. Moreover, the GS9219 will take the same method to regulate the output voltage when the input voltage changes. When the transient response is regulated, the converter will maintain a new steady-state operation.
Both the transient response state and the new state, the GS9219 always have the same on-time width. The GS9219 is suitable for solutions in which the output voltage is between 0.6V and 12V. 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 GS9219 is available in package TQFN23-4×4.
