NJM3524M

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Output Type:	Transistor Driver
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Configuration:	Positive, Isolation Capable
Topology:	Buck, Boost, Flyback, Push-Pull
Number of Outputs:	2
Output Phases:	1
Voltage - Supply (Vcc/Vdd):	8 V ~ 40 V
Frequency - Switching:	30kHz
Duty Cycle (Max):	45%
Synchronous Rectifier:	Yes
Clock Sync:	No
Serial Interfaces:	--
Control Features:	Current Limit
Operating Temperature:	-20°C ~ 75°C (TA)
Package / Case:	16-SOIC (0.209", 5.30mm Width)
Supplier Device Package:	16-DMP

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NJM3524M Voltage Regulator and Working Principle

NJM3524M is a DC-DC switching controller device from NJR Semiconductor Co. Ltd. This voltage regulator features an adjustable output voltage range and is offered in two different variants: one with a boosted output voltage and one as an adjustable current limiter. NJM3524M belongs to a family of devices referred to as PMIC voltage regulators. Voltage regulators are used to maintain a constant DC level by delivering current of appropriate magnitude in response to changing input signals. PMIC stands for power management integrated circuit, which combines functions of voltage and current regulators to provide a single efficient solution. NJM3524M is specifically designed as an adjustable current limiter with an additional boosted output feature. It achieves better control of current limiting through an internal bidirectional threshold. This enables it to be used in applications where the optimum current limit setting must be maintained above a certain voltage level for peak performance. It provides various protection functions such as thermal shutdown, short-circuit and current-limited protection. NJM3524M is an active voltage regulator device with a step-up and step-down output voltage. It uses a system of switches to control the voltage level at its output. This is achieved through varying the duty cycle of two power MOSFETs. The power MOSFETs are connected in a inverting "H" bridge configuration, where the sum of the switch currents mimic a single current source. This overall system forms a buck (step-down) converter or a boost (step-up) converter depending on the ratio of the input and output voltage.NJM3524M also features an adjustable voltage source output. This is achieved via an external control voltage input which varies the duty cycle of the switches. This feature allows the user to achieve a constant DC output between the range of 8 V to 45 V. The operation of NJM3524M is based on a constant frequency, fixed duty cycle operation. The frequency is set by an external resistor connected to a voltage comparator. This frequency is then used to drive two MOSFETs, where the current through each MOSFET is controlled using an internal current limit circuit. The internal circuit is based on an operational amplifier configuration which sets the current through the switches at a fixed level.NJM3524M can be used in many applications, such as powering AC-DC and DC converters, switching mode power supplies and DC/DC converters. It is suitable for use in a wide range of applications due to its adjustable output voltage, fixed input current operation and protection functions.In conclusion, NJM3524M is a versatile voltage regulator device with adjustable output voltage from 8 V to 45 V and adjustable current limitation protection. Its protection functions make it suitable for use in a wide range of applications and its ability to provide variable current limitation provides added flexibility.

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