The A8591 is designed to provide the power supply requirements
of next generation car audio and infotainment systems.
The A8591 provides all the control and protection circuitry
to produce a high-current regulator with ±1% output voltage
accuracy.
The A8591 employs current-mode control to provide simple
compensation, excellent stability, and fast transient response.
The A8591 employs pulse-frequency modulation (PFM) to
draw less than 33 μA from 12 VIN while supplying 5 V/40 μA
(A8591, 5 VOUT), or less than 24 μA from 12 VIN while
supplying 3.3 V/40 μA (A8591-1, 3.3 VOUT). When operational,
the A8591 operates down to at least 3.6 VIN (VIN falling). The
Sleep feature allows for very low standby current.
Features of the A8591 include a programmable PWM
switching frequency. The regulator switching frequency can
be synchronized to an external clock. The A8591 has external
compensation to optimize stability and transient response for
a wide range of external components and applications. The
A8591 has a fixed soft-start time of 5 ms.
Extensive protection features of the A8591 include pulse-by-pulse
current limit, hiccup mode short-circuit protection, open/short
asynchronous diode protection, BOOT open/short voltage protection,
VIN undervoltage lockout, and thermal shutdown.
The A8591 is supplied in a 10-pin wettable flank DFN package
(suffix EJ) with exposed power pad. It is lead (Pb) free, with 100%
matte-tin leadframe plating.
