A8587 Datasheet | Allegro MicroSystems

Wide Input Voltage, Adjustable Frequency, 2 Amp Non-Synchronous Buck Regulator with Enable and NPOR Features AND BENEFITS - Automotive AEC-Q100 qualified - Supply voltage from 3.8 to 36 V - Output voltage adjustable from 0.8 to 30 V - Maximized duty cycle for low-dropout operation - Low 30 μA operational quiescent current - 150 mΩ integrated MOSFET switch - Programmable switching frequency up to 4 MHz - Improved EMC with frequency dithering and controlled switch-node rise and fall times - Active-low power-on reset signal (NPOR) - Ceramic capacitor stable - Internal soft-start - Overcurrent protection APPLICATIONS - High-voltage power conversion - Automotive systems - Industrial power systems - Distributed power systems - Battery-powered systems PACKAGES: 10-Pin DFN with Exposed Thermal Pad (suffix EJ) Not to scale DESCRIPTION The A8587 is a high-frequency step-down switching regulator with an integrated high-side power MOSFET. It provides up to 2 A output current. The A8587 can achieve fast transient response using current-mode control and simple external pensation. The wide input range of 3.8 to 36 V makes the A8587 suitable for a wide range of step-down applications, including those in an automotive input environment. Battery-driven applications benefit from the low 30 μA operational quiescent current. The A8587 maintains high efficiency across a wide load range by the use of pulse-frequency modulation (PFM) as the load reduces. This in turn reduces switching and gate driver losses at light load. Frequency foldback helps to prevent inductor current runaway during startup and provides enhanced dropout performance. Extensive protection Features of the A8587 include pulse-bypulse current limit, hiccup-mode short-circuit protection, open/ short freewheeling diode protection, BOOT open/short voltage protection, VIN undervoltage lockout, and thermal shutdown. The A8587 also provides an active-low power-on reset (NPOR) signal. This signal goes high-...