CHL8228G-03CRT

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The CHL8228G-03CRT is a device from the family of Special Purpose Voltage Regulators from Power Management ICs (PMIC). It is a voltage regulator module of low-side run-time configuration, which is most suitable for onboard applications in Automotive electronics systems.

The operating voltage of this module belongs to the range of 6 to 16V and it is specially designed for the circuit application of ground referenced outputs. This module also features a high peak current capability of up to 8A, with a programmable PWM frequency that can be adjusted in the range of 32 to 64kHz, depending on the application requirements. The module can be used to provide adjustable voltage and current levels to the system components in automotive onboard circuits such as dashcam, car PC, and car radio.

The device is composed of two main components: the integrated regulator chip and the control logic block. The regulator chip comprises of input, output and bypass transistors, as well as a PNP/NPN driver transistor pair, a bootstrap diode, plus necessary capacitors and resistors. The control logic block includes two comparators, two Schmitt triggers, an oscillator and various logic gates, plus a few other components.

In addition to regulating the voltage, the CHL8228G-03CRT can also be used for current-limiting, reverse-recovery protection, and to reduce the audible noise that could result from switching regulators. Its wide range of features also supports active current-limiting, adjustable-frequency switching and slew rate control.

The basic working principle of this IC is similar to a typical switching regulator, such as a buck or boost booster regulator. The input voltage is fed to the input of the regulator chip, which consists of MOSFETs, capacitors, resistors and the driver transistor pair. The output voltage is then adjusted by the control logic blocks, which consists of comparators, Schmitt triggers and other logic gates. The PWM comparator inputs are used to sense the output voltage, and the other comparator inputs are used for current-limiting and reverse-recovery protection. The oscillator, which can be programmed from 32 to 64kHz, determines the operating frequency of the regulator chip.

The CHL8228G-03CRT can be effectively used for a wide variety of applications such as power supply for automotive radio, car PCs and dashcams, VLD (Variable LED Driver), LED Dimming, LED Boost, LED Buck-Boost regulators, low-side run-time switch, Li-Ion Battery Discharge Systems and many more. This device has been designed to meet the requirements of AEC-Q100 automotive qualification tests, providing enhanced reliability and performance in automotive systems.

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