Designed to provide the power supply requirements of next
generation car audio and infotainment systems, the A8589
provides all the control and protection circuitry to produce a
high current regulator with ±1.0% output voltage accuracy. The
A8589 employs pulse frequency modulation (PFM) to draw
less than 50 μA from 12 VIN while supplying 3.3 V/40 μA.
After startup, the A8589 operates down to at least 3.6 VIN
(VIN falling).
Features of the A8589 include a PWM/PFMn mode control
input to enable PWM (logic high) or PFM (logic low). If
the PWM/PFMn input is driven by an external clock signal
higher than the base frequency ( fOSC) the PWM frequency
synchronizes to the incoming clock frequency. The SLEEPn
input pin commands an ultra-low current shutdown mode
requiring less than 5 μA for internal circuitry and 10 μA (max)
for MOSFET leakage at 16 VIN, 85ºC. The A8589 has external
compensation to accommodate a wide range of frequencies
and external components, and provides a power-on reset
(NPOR) signal validated by the output voltage.
Extensive protection features of the A8589 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 A8589 is supplied in a low profile 16-pin TSSOP package
with exposed power pad (suffix LP). It is lead (Pb) free, with 100%
matte-tin leadframe plating.
