LT1937ES5#TRMPBF

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	DC DC Regulator
Topology:	Step-Up (Boost)
Internal Switch(s):	Yes
Number of Outputs:	1
Voltage - Supply (Min):	2.5V
Voltage - Supply (Max):	10V
Voltage - Output:	36V
Current - Output / Channel:	320mA (Switch)
Frequency:	1.2MHz
Dimming:	Analog, PWM
Applications:	Backlight
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SOT-23-5 Thin, TSOT-23-5
Supplier Device Package:	TSOT-23-5
Base Part Number:	LT1937

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Introduction

The LT1937ES5#TRMPBF is a bipolar PMIC LED driver manufactured by Linear Technology. It is a high efficiency switching step-up (boost) converter that is fully integrated with temperature protection, as well as pulse-by-pulse current and voltage limit. This PMIC LED driver is used in applications that require a precise, consistent and reliable output, making it suitable for a variety of lighting applications. It can operate from input voltages as low as 3.3V and is capable of driving up to 10 LEDs in series. It also features a low quiescent current of 20μA and a shutdown current of less than 0.1μA. Additionally, it has an internal compensation network which allows the output voltage to remain constant with changes in the load current.

Application Fields

The LT1937ES5#TRMPBF can be used in a wide range of lighting applications such as LED displays, LED torches, LED flood lamps, LED home lighting, LED automotive lighting and LED industrial lighting. It is also ideal for LED backlighting, LED street lighting and LED circuit protection systems. It can also be used in solar LED systems as it is designed to give a constant output voltage regardless of changing input voltage, making it ideal for use in fluctuating input circumstances.

Features

The LT1937ES5#TRMPBF provides a variety of features making it suitable for a multitude of applications. It features low input voltage of 3.3V, allowing it to be powered efficiently from a variety of sources. It also features a thermal protection circuit, allowing it to monitor its own temperature as well as the temperature of the load, ensuring it operates safely in a variety of temperature extremes. Additionally, it has an adjustable frequency of up to 400kHz, allowing it to be tuned for optimal efficiency when driving LEDs of varying capacitance. It also has under-voltage and over-voltage protection.

Working Principle

The LT1937ES5#TRMPBF is a bipolar PMIC LED driver that uses a switching step-up (boost) conversion circuit. It operates by switching an internal high-current switch (MOSFET) at a frequency determined by a internal oscillator. This switching process creates a high-voltage DC output that is used to power LEDs. The output voltage is determined by an internal fixed reference voltage and a feedback loop. The feedback loop is used to compare the output voltage to the reference voltage and controls the duty cycle of the internal switch, ensuring the output voltage remains consistent.

Conclusion

The LT1937ES5#TRMPBF is a high efficiency bipolar PMIC LED driver designed to be used in a variety of applications that require a precise, consistent and reliable output. It is capable of driving up to 10 LEDs in series and is extremely versatile as it can operate from low input voltages as low as 3.3V. It also features an adjustable frequency of up to 400kHz, allowing it to be optimised for a variety of LED load capacitances. Additionally, it has internal temperature protection and pulse-by-pulse current and voltage limit to ensure its safety and reliability.It operates using a switching step-up (boost) conversion circuit, with the output voltage being determined by an internal reference voltage and the feedback loop controlling the duty cycle of the internal switch. Its versatility, efficiency and reliability make the LT1937ES5#TRMPBF a suitable choice for a variety of LED lighting applications.

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