ARG81801: Wide Input Voltage, 2.4 MHz, 3.0 A Asynchronous Buck Regulator with Sleep Mode, External Synchronization, and POK Output

Designed to provide the power supply requirements of next generation car audio and infotainment systems, the ARG81801 provides all the control and protection circuitry to produce a high current regulator with ±1.0% output voltage accuracy. After startup, the ARG81801 operates down to at least 3.6 V_IN (V_IN falling).

If the SYNC input is driven by an external clock signal higher than the base frequency (f_OSC), the PWM frequency synchronizes to the incoming clock frequency. The SLEEP input pin commands an ultralow current shutdown mode requiring less than 5 μA for internal circuitry and 10 μA (max) for MOSFET leakage at 16 VIN, 85°C.

The ARG81801 has external compensation to accommodate a wide range of frequencies and external components, and provides a Power OK (POK) signal validated by the output voltage.

The ARG81801 uses an Enhanced Idle/Stop-Start Recovery technique to reduce or eliminate output overshoot when VIN recovers from levels below V_IN minimum (i.e. V_OUT drops out of regulation).

Extensive protection features of the ARG81801 include pulse-by-pulse current limit, hiccup mode short circuit protection, open/short asynchronous diode protection, BOOT open/short voltage protection, V_IN undervoltage lockout, V_OUT overvoltage protection, and thermal shutdown.

The ARG81801 is supplied in a 24-pin wettable flank QFN package with exposed power pad (suffix ES). It is lead (Pb) free, with 100% matte-tin leadframe plating.