A8600: Quadruple Output Regulator with Two High-Side Switches, BU/ACC Voltage Detectors, and Mute Delay


Designed to provide the power supply requirements of next generation car audio and infotainment systems, the A8600 provides all the control and protection circuitry to produce four high current regulators, each with ±1.5% accuracy. The A8600 includes control circuitry to implement three adjustable, asynchronous buck regulators with integrated MOSFETs. Also, the A8600 provides the control circuitry, gate drivers, and current sensing to implement a synchronous buck controller with external MOSFETs. In standby mode, the A8600 draws less than 50 μA from VIN of 12 V while employing pulse frequency modulation (PFM) to deliver 3.3 V/40 μA via the always-on regulator, SW1. The always-on regulator operates down to at least VIN of 3.6 V (VIN falling).

Features of the A8600 include: an EN/SYNC input to either turn the A8600 on/off or increase/decrease the base pulse width modulation (PWM) frequency, four adjustable soft-start times, and four external compensation pins. Output voltage monitoring of switchers SW2, SW3, and SW4 is provided by a single, open-drain POK output. In addition, the A8600 provides two high voltage, high-side switches with foldback overcurrent protection. These two high-side switches actively block reverse current. The A8600 also provides direct battery (BU) and switched (accessory) battery (ACC) detectors and a mute pulse output with an adjustable delay.

Protection features of the A8600 include pulse-by-pulse current limit, hiccup mode short circuit protection, asynchronous diode protection, BOOT voltage protection, undervoltage lockout, overvoltage protection and thermal shutdown.

The A8600 is supplied in a low profile 48-pin LQFP package (suffix JP ) with exposed power pad. It is lead (Pb) free, with 100% matte tin leadframe plating.

Major Features

Major Features

Top Features

  • Four independent, high current switching regulators
  • Adjustable 1.0 A/±1.5% always-on asynchronous buck regulator with an integrated 150 mΩ MOSFET (SW1)
    • Employs PFM to deliver 3.3 V/40 μA while drawing less than 50 μA from VIN of 12 V
    • Operates down to at least 3.6 VIN
  • Adjustable 1.5 A/±1.5% asynchronous buck regulator with an integrated 120 mΩ high-side MOSFET (SW2)
  • Adjustable 2.0 A/±1.5% asynchronous buck regulator with an integrated 110 mΩ MOSFET (SW3)
  • Adjustable ±1.5% synchronous buck controller with integrated gate drivers and current sensing (SW4)
  • Fixed 425 kHz, interleaved PWM switching frequency
  • EN/SYNC input for PWM frequency scaling
  • Adjustable soft-start time for each switching regulator
  • All switching regulators provide prebias startup with zero reverse current
  • All switching regulators have overvoltage protection
  • External compensation for all switching regulators
  • Power OK (POK) open-drain output with de-glitch
  • BU and ACC voltage detectors and comparators
  • Mute control with programmable delay
  • Two internal high-voltage, high-side NMOS switches (S1 and S2) with foldback short circuit protection
  • High-side switches simultaneously controlled on/off
  • High-side switches block reverse current
  • Internal charge pump for high-side switch biasing
  • Withstands surge voltages up to 40 V
  • −40°C to 85°C ambient operating temperature range
  • 150°C maximum junction temperature
  • Thermally enhanced, surface mount package

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
A8600EJPTR-T 48-lead LQFP -40°C to 85°C Yes View Data Contact your
local sales rep
Distributor Stock
APEK8600EJP-01-MH DEMO BOARD -40°C to 85°C No -- Contact your
local sales rep
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.