LT3437EDD#TRPBF

PMIC - Voltage Regulators - DC DC Switching Regulators

The LT3437EDD#TRPBF is a DC-DC switching regulator that provides wide input and adjustable output voltage configurations. It can be used to step-up, step-down, buck, boost and SEPIC operations. The LT3437EDD#TRPBF integrates a high-voltage power NMOSFET and a synchronous rectifier allowing high efficiency operation with low RDS_ON values in a very small form factor.

Applications

The LT3437EDD#TRPBF is suitable for high-efficiency, power-dense power management applications. Its wide input voltage range and delivery of up to 2.5 A of current make it a suitable choice for applications that require support for battery and USB power sources, such as wearables, IoT, and portable electronics.

Working Principle

The LT3437EDD#TRPBF is a DC-DC switching regulator that works on the principle of pulse-width modulation (PWM) control. In this type of control, the regulator output is regulated by modulating the width of the pulses applied to the switching element. The regulator adjusts the duty cycle of the output pulses based on feedback from the output voltage, controlling the voltage at the regulator output.

The switching element consists of a NMOSFET, with a synchronous rectifier providing high efficiency operation with low on-resistance. The NMOSFET is connected to a switch controller which regulates the duty cycle of the pulses applied to the MOSFET based on the feedback.

The internal oscillator in the IC generates a clock signal which is used for timing the pulses. The output voltage can be programmed using an external resistor-divider network or by using the ISET pin of the IC. The maximum output current is set using an external sense resistor.

The LT3437EDD#TRPBF provides various protection features such as over-voltage protection (OVP) and current-limit protection (CLP). The over-voltage protection circuitry is fed back from the output voltage to the IC and shuts down the output when it exceeds the programmed voltage. The current-limit protection feature monitors the current flowing through the sense resistor and shuts down the output when it exceeds the programmed limit.

Conclusion

The LT3437EDD#TRPBF is a DC-DC switching regulator that provides wide input and adjustable output voltage configurations. It is suitable for high-efficiency, power-dense applications that require support for battery and USB power sources, such as wearables, IoT, and portable electronics. The LT3437EDD#TRPBF works on the principle of pulse-width modulation control. It integrates a high-voltage power NMOSFET and a synchronous rectifier enabling high efficiency operation with low RDS_ON values in a small form factor. The IC provides various protection features such as over-voltage protection for output and current limit protection for the MOSFET.