The ADP2450 integrates one boost shunt controller with power detection, one high efficiency buck regulator, four low offset, low power consumption programmable gain amplifiers (PGAs), one low offset operation amplifier, a fast analog trip circuit, and an actuator driver. The ADP2450 is targeted for low voltage circuit breakers, such as the molded case circuit breaker (MCCB), and current transformer (CT) powered supply applications.The boost output voltage can be up to 36 V and integrates a power detection circuit that prevents the circuit from power hiccups. The power detection threshold is programmable with resistors.The buck regulator operates over a wide input voltage range of 4.5 V to 36 V, and the output voltage can be adjusted down to 0.6 V. The buck regulator provides output currents of up to 500 mA. The buck regulator works in pulse-width modulation (PWM) mode with a fixed 1.2 MHz switching frequency, providing low output ripple voltage to the system.The output voltage of the buck regulator is monitored by the supervisory circuit. When the output voltage is below the monitoring threshold, 88% of VFB2(FB2 regulation voltage), the reset signal is pulled low and can be used to reset the microprocessor. The monitoring supervisory circuit makes the system more reliable.The ADP2450 integrates four low offset, low power consumption amplifiers. With the programmable gain features, the ADP2450 provides accuracy measurement over a wide current input range based on the CT turn ratio.A low offset operation amplifier is integrated in the ADP2450 for leakage current detection.The ADP2450 also integrates an analog trip circuit, which provides fast trip response and enhances system reliability.Additional protection includes buck overcurrent protection (OCP) and system thermal shutdown (TSD).The ADP2450 operates over the −40°C to +125°C junction temperature range and is available either in a 32-lead LFCSP or a 48-lead LQFP packages.ApplicationsLow voltage circuit breakerCT powered supply