Allegro Microsystems A8654

Description

The A8654 is a high output current synchronous buck regulatorthat integrates low RDSON high-side and low-side N-channelMOSFETs. The A8654 incorporates PWM current-mode controlto provide simple compensation, excellent loop stability andfast transient response. The A8654 uses external compensationto accommodate a wide range of power components to achieveboth excellent loop stability and desirable transient response.The A8654 regulates nominal input voltages from 4 to36 V and remains operational when VIN drops as low as2.6 V. When the input voltage approaches the output voltage,the duty cycle is maximized to maintain the output voltage.The A8654 is able to provide 3 A steady-state load current.The A8654 features externally set soft-start time, externalcompensation network, an EN input to enable VOUT, aSYNC/FSET input to synchronize or set the PWM switching frequency, and a NPOR output validated by the output voltage.Protection features include VIN undervoltage lockout (UVLO),pulse-by-pulse overcurrent protection, hiccup mode short-circuitprotection, overvoltage protection, and thermal shutdown. A8654provides open-circuit, adjacent pin short-circuit and short-to-groundprotection at every pin to satisfy the most demanding automotiveand nonautomotive applications.The maximum junction temperature is 150°C. The A8654 deviceis available in a 16-pin eTSSOP package with exposed pads forenhanced thermal dissipation. It is lead (Pb) free, with 100% mattetinleadframe plating.

Features

Automotive AEC-Q100 qualified

• Operating voltage range: 4 to 36 V
• UVLO STOP threshold: 2.6 VTYP
• Maximized duty cycle for low-dropout operation
• Withstands surge voltages up to 40 V
• Capable of 3 A steady-state output current
• Integrated high-side and low-side switching MOSFETs
• Adjustable switching frequency (fSW): 100 kHz to2.2 MHz
• Synchronization capability to external clock: 100 kHz to2.2 MHz
• Frequency dithering for lower EMI signature
• External adjustable compensation network
• Soft-start time externally set via the SS pin
• Pre-bias startup compatible
• Active-low, power-on reset (NPOR) outputOvervoltage protection, pulse-by-pulse current limit, hiccupmode short-circuit and thermal protections
• Open-circuit and adjacent pin short-circuit tolerant
• Short-to-ground tolerant at every pin
• Stable with ceramic output capacitors

Typical applications

• Audio, Video Navigation Systems,Rear Seat Media Display,General 24 V / 36 V
• Telematics
• RADAR, LIDAR,mmWave systems,Vision and Detection System
• Automotive Infotainment Systems,Instrument Clusters, Industrial,Advanced Driver Assistance Systems

More information

• Datasheet
• IC product information