Power Management IC for

Circuit Breaker Applications

Data Sheet

ADP2450

Rev. B

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FEATURES

Boost shunt controller

Adjustable output voltage range: 4.5 V to 36 V

Integrated boost shunt driver

Programmable power detection threshold

Buck regulator

Input voltage range: 4.5 V to 36 V

Continuous output current: 500 mA

Adjustable output voltage down to 0.6 V

Fixed output options: 3.3 V and 5 V

1.2 MHz fixed switching frequency

Voltage monitoring and open-drain reset output

4 programmable gain amplifiers

Low power consumption

Programmable gain and output dc common voltage

Low offset operation amplifier for leakage and grounding

fault current detection

Analog trip circuit with programmable trip threshold

Actuator driver output

APPLICATIONS

Low voltage circuit breaker

CT powered supply

TYPICAL APPLICATION CIRCUIT

ADP2450

DIODE

BOOST

SHUNT

CONTROL

ACTUATOR

DRIVER

GAIN

SELECTION

ANALOG

TRIP

BUCK

REGULATOR

L

MCU

ADCs

GPIO2

GPIO1

ACTUATOR

CT CURRENT

PGAs

SENSED

VOLTAGE

Figure 1.

GENERAL DESCRIPTION

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

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 in either a 32-lead LFCSP

package or a 48-lead LQFP package.