LTC3525ESC6-5#TRPBF

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PMIC - Voltage Regulators - DC DC Switching Regulators

The LTC3525ESC6-5#TRPBF is an advanced DC/DC switching regulator that offers excellent efficiency, high capability transients and ultra-low output noise. The regulator is designed for use in single cell, dual cell and battery-powered applications, and can provide up to 1A of output current far below the typical quiescent current in hold-up applications. The regulator has two circuits: one is the main circuit and the other is a low-power linear regulator circuit.

Application Field

The LTC3525ESC6-5#TRPBF is suited for battery-powered and short burst applications, particularly those requiring high efficiency. It can be used in portable devices such as mobile phones, handheld computers, personal digital assistants, digital cameras, and portable music players. It is also suitable for other applications such as robotic motors and servos, embedded applications, and for powering levels and driver stages of industrial and automotive electronics.

Working Principle

The LTC3525ESC6-5#TRPBF, an integrated buck-boost DC/DC converter, is based on a dual-loop control architecture. It contains step-down buck, boost and buck-boost control loops to deal with input voltage transients and to generate desired output voltage. Additionally, the voltage and current limits are setable for each loop. The input voltage can vary from 3V to 7V, while the output voltage is set to 5V.

The main loop of the converter, called the voltage loop, senses the output voltage and sets the duty cycle of the high side switch accordingly. The duty cycle is kept constant by regulating the duty cycle, or the on-time, of the high side switch such that the error voltage (error = feedback voltage - reference voltage) is zero. The synchronization signals for the high side and low side switches are generated within the controller, so no external synchronization signals are required. The power transistors are driven by an internal MOSFET driver which protects them from overvoltage and overcurrent conditions.

The second loop, called the current loop, is used to limit the maximum load current and to respond to input voltage transients. It compares the current limit voltage, set by a resistor, to the output current. The current loop adjusts the on-time of the switches so that the maximum allowed output current won\'t be exceeded. The current limit of the LTC3525ESC6-5#TRPBF can also be set dynamically by varying a reference current source. As a result, it has fast response to current transients.

The LTC3525ESC6-5#TRPBF also integrates a low power linear regulator that can be used to provide a low noise 5V supply. The low power linear regulator can provide up to 200mA of current are far below the typical quiescent current in hold-up applications. The linear regulator uses an N-channel MOSFET as the pass element. The output voltage is regulated by varying the gate voltage of the MOSFET.

Overall, the LTC3525ESC6-5#TRPBF offers an excellent solution for various applications requiring a tightly regulated output voltage and fast response to load transients and input voltage transients. The device offers high efficiency and can provide up to 1A of current with low quiescent current and minimal external components. Therefore, it is suitable for applications where power saving is important.

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