LM3524DN

Frequency - Switching:	--
Base Part Number:	LM3524
Supplier Device Package:	16-PDIP
Package / Case:	16-DIP (0.300", 7.62mm)
Operating Temperature:	0°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	49%
Series:	--
Voltage - Supply (Vcc/Vdd):	8 V ~ 40 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck, Boost
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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Introduction

LM3524DN (also known as Duo-Mode DC/DC Controller) is an integrated, dual-mode, pulse width modulation (PWM) voltage regulator specifically designed for low power devices such as portable computers, personal digital assistants (PDAs), digital cameras, and other battery-operated systems. This controller is designed to combine low power operation with outperformance. It offers the flexibility to regulate pair of output voltages, operating them in a series, parallel, or individual configuration. It features a high-accuracy programmable voltage dropping and over-voltage protection. Its other features include soft-off, track/hold and positive or negative voltage tracking functions.

Application Field

The LM3524DN is a versatile integrated circuit ideal for low power, space-sensitive applications, including portable electronics, automotive electronics, and telecom equipment. It is also suitable for battery-operated applications as its two modes of operation enable power savings with low-power and low-noise operation.In portable and battery-operated electronics, the device\'s low power operation, combined with its quick response to dynamic load changes, helps extend operating time of the devices. In addition, the integrated soft off and tracking functions can eliminate the need for complicated circuit designs, allowing for shorter development cycles. The device is capable of regulating pair of voltages, providing power savings and increased system reliability.In automotive electronics, the device\'s narrow operating temperature range (–40°C to 125°C) allows it to be used in a range of high temperature applications. Its soft-off, track/hold and positive or negative voltage tracking functions make it ideal for applications that require high power efficiency, such as power management and ECU (engine control unit) applications.Lastly, in telecom equipment and other communications systems, the LM3524DN can provide a range of power savings. It can be used to regulate multiple voltages at the same time, offering improved power efficiency and longer battery life. Also, its high-accuracy programmable voltage dropping and over-voltage protection allows system protection, ensuring that the system will operate safely.

Working Principle

The LM3524DN is composed of two main components: a Pulse Width Modulation (PWM) voltage regulator and a Dual Mode Controller. In the PWM voltage regulator, the input voltage, VIN, is compared to a voltage reference to generate an error signal. The error signal is compared to an internally generated sawtooth signal to generate a pulse width modulated output voltage. The duty cycle of the output voltage is directly proportional to the error signal. This duty cycle is used to regulate the output voltage by controlling the peak output current.In the Dual Mode Controller, the output of the PWM voltage regulator is compared to a voltage reference to generate an error signal. This error is then compared to an internally generated sawtooth to generate a mode control signal. This signal is used to select the output voltage mode. It can be programmed to operate in one of two modes: Series or Parallel. In Series Mode, the two outputs are connected in series and each output is set according to the Series Voltage control voltage. In Parallel Mode, the two outputs are connected in parallel and each outputs is set according to its own Output Voltage Setting voltage.

Conclusion

In conclusion, the LM3524DN is an integrated, dual-mode, pulse width modulation (PWM) voltage regulator specifically designed for low power devices. This device offers the flexibility to regulate pair of output voltages, operating them in a series, parallel, or individual configuration. It is ideal for low power, space-sensitive applications in both consumer and industrial applications. Its soft-off, track/hold and positive or negative voltage tracking functions make it suitable for applications that require high power efficiency. The LM3524DN is capable of regulating pair of voltages, providing power savings and increased system reliability.

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