Synchronous buck regulator ICs for USB charging
The new A8652 and A8653 from Allegro MicroSystems Europe extend the company's portfolio of automotive regulator ICs by adding two devices targeted specifically at USB power applications.
The new devices are high output current synchronous buck regulator ICs that provide tight load regulation over a wiring harness without the need for remote sense lines. This remote load regulation is achieved with an integrated open-loop correction scheme that, given a known wiring harness resistance, adjusts the output voltage based on the measured load current and a user programmable gain, achieving ±2% accuracy at 500 mV of correction.
The remote load regulation control includes a 115% regulated voltage clamp in conjunction with a dynamic overvoltage protection circuit using threshold changing with the correction voltage.
The A8652 and 8653 each include a user-configurable load-side current limit to fold back the output voltage during an output overcurrent condition. The devices regulate nominal input voltages from 4.0 V to 36 V and remain operational even when the input voltage drops as low as 2.6 V. When the input voltage approaches the output voltage, the duty cycle is maximised to maintain the output voltage.
Allegro MicroSystems Europe
+33 (0) 4 50512359
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