Description
The A4402 is a dual-output regulator, combining in a single package a constant on-time buck regulator and a linear regulator (LDO)—each with adjustable output voltages. It is ideal for applications that require two regulated voltages, such as in microcontroller- or DSP-based applications requiring core and I/O voltage rails.
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, allowing the use of small low value inductors and capacitors while avoiding sensitive EMI frequency bands such as AM radio in automotive applications.

FEATUREs and Benefits
▪ 2 MHz switching frequency
▪ Adjustable soft start timer
▪ Watchdog input
▪ Power-on reset output
▪ Adjustable buck and linear regulators
▪ Enable input
▪ 6 to 50 V supply voltage range
▪ Overcurrent protection
▪ Undervoltage lockout (UVLO)
▪ Thermal shutdown protection

APPLICATIONs:
AUTOMOTIVE (“K” VERSION)
• Power steering control units
• Transmission control units
• Lighting control units
• Infotainment
• Cluster
• Centerstack
• Other body control

COMMERCIAL (“E” VERSION)
• Photo and inkjet printers
• Industrial controls
• Distributed power systems
• Networking applications
• Point-of-sale
• Security systems