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

Description

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 VIN (VIN falling).

If the SYNC input is driven by an external clock signal higher than the base frequency (fOSC), 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 VIN minimum (i.e. VOUT 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, VIN undervoltage lockout, VOUT 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.

Top Features

  • Automotive AEC-Q100 qualified
  • Withstands surge voltages up to 40 V
  • Operates as low as 3.6 VIN (max) with VIN decreasing
  • Delivers up to 3.0 A of output current with integrated 110 mΩ high voltage MOSFET
  • SLEEP input pin commands ultralow current shutdown mode
  • Adjustable output voltage with ±1.0% accuracy from 0°C to 85°C, ±1.5% from –40°C to 150°C
  • Programmable switching frequency: 250 kHz to 2.4 MHz Applying a clock input to the SYNC pin will increase the PWM frequency
  • Power OK (POK) open-drain output
  • Maximized duty cycle for low dropout
  • Enhanced idle-stop recovery during VIN transients
  • Pre-bias startup capable, VOUT will not cause a reset
  • External compensation for maximum flexibility
  • Excellent set of protection features to satisfy the most demanding applications
  • Overvoltage, pulse-by-pulse current limit, hiccup mode short circuit, and thermal protection

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
APEK81801KES-2MHZ-MH DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check
Distributor Stock
APEK81801KES-410KHZ-MH DEMO BOARD -40°C to 125°C No -- Contact your
local sales rep
Check
Distributor Stock
ARG81801KESJSR 24-lead QFN -40°C to 125°C -- View Data Contact your
local sales rep
Check
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

ARG81801 Packages

Design Support Tools