CAT4137TD-GT3 Integrated Circuits (ICs)

Voltage - Supply (Max):	5.5V
Supplier Device Package:	TSOT-23-5
Package / Case:	SOT-23-5 Thin, TSOT-23-5
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Applications:	Backlight
Dimming:	Analog, PWM
Frequency:	1MHz
Current - Output / Channel:	30mA
Voltage - Output:	24V
Series:	--
Voltage - Supply (Min):	2.2V
Number of Outputs:	1
Internal Switch(s):	Yes
Topology:	Step-Up (Boost)
Type:	DC DC Regulator
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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Introduction

PMIC-LED Drivers are used in a wide range of applications, from industrial lighting to computer displays. One particular type of LED driver is the CAT4137TD-GT3, which offers a combination of features that make it suitable for a broad range of applications. In this article, we will discuss the CAT4137TD-GT3\'s application field and working principle.

Application Field

The CAT4137TD-GT3 is a current-regulating DC/DC controller optimized for driving up to four LEDs in string or parallel configurations. It is designed to produce an adjustable constant-current output, using either an external sense resistor or an internal resistor. The device operates with a wide input voltage range and is fully protected against reverse polarity connection and over-temperature operating conditions.The CAT4137TD-GT3 provides a wide range of features that make it suitable for a broad spectrum of applications, such as backlighting for LCD panels, LED sign boards, and outdoor LED lighting. It has a very fast response time and built-in features such LED current setting, thermal protection, and Under-Voltage Lockout (UVLO).

Working Principle

The CAT4137TD-GT3 follows a Constant-Current Regulation (CCR) principle. In this technique, the LED current is regulated by adjusting the internal reference voltage of the LED driver using an external current-setting resistor. The LED driver monitors the external voltage of the LED string and continually adjusts the reference voltage in order to maintain a constant LED current.The device is also equipped with a thermal-shutdown protection feature, which is used to protect the LED from overtemperature conditions. This feature is activated when the die temperature exceeds a certain level, resulting in a reduction in the LED current until the temperature drops to a safe level.

Conclusion

The CAT4137TD-GT3 is a current-regulated DC/DC controller optimized for driving up to four LEDs in string or parallel configurations. It is suitable for a broad range of applications, including backlighting for LCD panels, LED sign boards, and outdoor LED lighting. The device operates using a Constant Current Regulation (CCR) principle, which maintains a constant LED current by adjusting the internal reference voltage of the LED driver. Additionally, the device is equipped with a thermal-shutdown protection feature, which is used to protect the LED from overcooking.

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