LT1521IST-5#TRPBF

Current - Output:	300mA
Base Part Number:	LT1521
Supplier Device Package:	SOT-223-3
Package / Case:	TO-261-4, TO-261AA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Reverse Polarity
Control Features:	Enable
PSRR:	58dB (120Hz)
Current - Supply (Max):	12mA
Current - Quiescent (Iq):	25µA
Series:	--
Voltage Dropout (Max):	0.75V @ 300mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	5V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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The LT1521IST-5#TRPBF is a high performance, wide input range synchronous step-down DC/DC converter optimized for current applications up to 8 A. It is designed to deliver high efficiency and fast transient response, over a wide input voltage range of 4 V to 40 V, with excellent line and load regulation. It features switching frequencies up to 2 MHz, and is rated for an output voltage range of 400 mV to 36 V.This linear voltage regulator is easy to configure, with external synchronization and shutdown options, as well as an adjustable output voltage via a single resistor. It contains a low noise PFM/PWM controller to ensure high efficiency, loading, or light load. An on-chip compensation network allows fast transient response and simplifies design.The LT1521IST-5#TRPBF is the ideal solution for space-constrained, high-current applications in industrial, automotive, and telecommunications. It can also be used in power supplies, portable electronics, telecom equipment, and other systems where output voltage regulation and fast response time is critical. It is highly efficient, with a typical efficiency of greater than 95%, and provides excellent ripple and noise suppression.The LT1521IST-5#TRPBF works on the principle of pulse width modulation (PWM), which provides the basis for an efficient and stable regulator. The output voltage is regulated by controlling the duty cycle of the PWM signal, which is proportional to the output voltage. The maximum output current is dependent on the supply voltage, temperature and component selection.The converter consists of a power switch, a power sensing circuit, and a current feedback loop. The control circuit consists of an internal oscillator, PWM comparator, and voltage and current sense. The internal oscillator produces a periodic signal to drive the PWM comparator, which toggles the power switch and causes the output voltage to vary. The power sensing circuit, made up of resistors, R1 and R2, senses the output voltage. The current feedback loop includes the sense resistor, R3, and ensures the output current remains within the specified range by controlling the voltage across the inductor.The LT1521IST-5#TRPBF offers excellent thermal stability and an adjustable current limit that can be set via the external resistor. It also features an adjustable soft-start, which prevents large inrush currents, and an under-voltage lockout circuitry to prevent the output voltage from dropping below the specified level. The LT1521IST-5#TRPBF is designed for low noise operation, with a low switching frequency of up to 2 MHz, which reduces the height of the output voltage ripple, providing excellent noise suppression. It also offers a programmable frequency foldback mode, which can reduce switching frequency as the load current increases. This feature reduces EMI noise and helps to enhance overall system reliability. The LT1521IST-5#TRPBF voltage regulator is designed for high performance, wide input voltage range, wide output voltage range, fast transient response, and high efficiency. With its adjustable output voltage, adjustable current limit, and programmable soft-start, this linear voltage regulator provides an excellent and reliable solution for applications requiring high performance and low noise.

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