The RT8540A is a high-efficiency, high-current Boost converter in all single-cell Lithium-ion / polymer battery operated products. The RT8540A maintains output current regulation by switching the internal high side and low side switch transistors. The transistor switches are pulse-width modulated at a fixed frequency of 2MHz. The high switching frequency allows the use of a small inductor and output capacitor, making the RT8540A ideally suited for small battery-powered applications. Output voltage can be set by an external resistor on the FB pin or by I2C interface.
The RT8540A contains over voltage protection, over current protection and over temperature protection to prevent the device from output open circuit or short circuit condition. Built-in soft-start circuitry prevents excessive inrush current during start-up. The shutdown feature reduces quiescent current to less than 5μA.
Applications
- Cellular Phones
- Digital Cameras
- Probable Instruments