Features
- 2 MHz switching frequency
- Adjustable soft start timer
- Watchdog input
- Power-on reset output
- Adjustable 2% buck regulator
- Adjustable 2% linear regulator
- Enable input
- 6 to 50 V supply voltage range
- Overcurrent protection
- Undervoltage lockout (UVLO)
- Thermal shutdown protection
Applications
- Photo and inkjet printers
- Industrial controls
- Distributed power systems
- Network applications
Description
The A4402 is a power management IC that combines a 2% constant on-time buck regulator and a 2% linear regulator. Ideal for applications that require two regulated voltages. The buck regulator output supplies the adjustable linear regulator to reduce power dissipation and increase overall efficiency.
The switching regulator is capable of operating above 2 MHz. A greater than 2 MHz switching frequency enables the customer to select low value inductors and capacitors while avoiding EMI.
Protection features include undervoltage lockout and thermal shutdown. In case of a shorted load, each regulator features overcurrent protection. The A4402 also features a power-on reset with adjustable delay for the microprocessor output.
The A4402 is provided in a 16-pin, ≤1.20 mm nominal overall height TSSOP, with exposed pad for enhanced thermal dissipation. It is lead (Pb) free, with 100% matte tin leadframe plating.
Functional Block Diagram
