New Automotive-Compliant Synchronous Buck Converters from Diodes Inc.November 22, 2020 by Hailey Stewart
This article highlights Diodes Incorporated two highly integrated synchronous buck converters that simplify circuit design in automotive power systems with its Power Good output.
Diodes Incorporated has announced two highly integrated synchronous buck converters that simplify circuit design in automotive power systems with its Power Good output and its innovative EMI mitigation for noise-sensitive applications.
Image courtesy of Diodes Incorporated
The AP63356Q and AP63357Q are 3.5A converters with an input voltage range of 3.8V to 32V. Leveraging peak current mode control as well as high-side and low-side power MOSFETs on-chip, the converters minimize external components to reduce bill of materials (BOM) costs and board size.
Both devices have a Power Good indicator with an internal 5MΩ pull-up resistor useful for power sequencing. To further aid sequencing, their enable pin has accurate voltage thresholds, which allows adjustment of the input voltage device power-on and undervoltage lockout (UVLO). The high-voltage capability of the EN pin allows direct connection to VIN to simplify the auto-start of the device. When disabled, the converter draws only 0.6µA shutdown current typical.
Their proprietary gate-driver scheme ensures clean switching transitions while preventing switch-node ringing to minimize high-frequency radiated noise. Frequency spread spectrum (FSS) contributes further to quiet performance by dispersing switching-noise energy.
The AP63356Q operates continuously in PWM mode at the nominal 450kHz switching frequency for all loads. The AP63357Q changes to PFM mode at light loads, keeping efficiency as high as 86% at 5mA load and drawing quiescent current of just 22µA under no load.
Both devices feature low-dropout (LDO) operation, which maintains their output-voltage regulation as the input reduces to a level near the output voltage. Built-in protection features include output undervoltage protection (UVP), cycle-by-cycle peak current limit, and thermal shutdown. The protection features, along with 40V (for 400ms) input voltage surge withstand capability, enable the devices to provide a robust Automotive POL solution.
The AP63356Q and AP63357Q are qualified to AEC-Q100 Grade 1, support PPAP documentation, and are manufactured in IATF 16949 certified facilities. The devices are each available in a 3mm × 2mm V-DFN3020-13 (SWP) package with wettable flanks to aid in automated optical inspection. The unit price is $0.46 in 3000 piece quantities.
About Diodes Incorporated
Diodes Incorporated is a leading global manufacturer and supplier of high-quality application-specific standard products within the broad discrete, logic, analog and mixed-signal semiconductor markets. Diodes serve the consumer electronics, computing, communications, industrial, and automotive markets. Diodes’ products include diodes, rectifiers, transistors, MOSFETs, protection devices, function-specific arrays, single gate logic, amplifiers and comparators, Hall-effect and temperature sensors, power management devices, including LED drivers, AC-DC converters and controllers, DC-DC switching and linear voltage regulators, and voltage references along with special function devices, such as USB power switches, load switches, voltage supervisors, and motor controllers.