LM3502SQ-25/NOPB

Voltage - Output:	25V
Base Part Number:	LM3502
Supplier Device Package:	16-WQFN (4x4)
Package / Case:	16-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Applications:	Backlight
Dimming:	PWM
Frequency:	1MHz
Current - Output / Channel:	600mA (Switch)
Series:	--
Voltage - Supply (Max):	5.5V
Voltage - Supply (Min):	2.5V
Number of Outputs:	2
Internal Switch(s):	Yes
Topology:	Step-Up (Boost)
Type:	DC DC Regulator
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Introduction

The LM3502SQ-25/NOPB is a PMIC (Power Management IC) designed by Texas Instruments. It is designed to drive LEDs in applications with an input voltage range of 4.5 to 40V. The package of this LM3502SQ-25/NOPB is a 10-pin, 3mm x 3mm QFN (Qualified Small Outline No-Lead package) to provide the necessary isolation and protection for the internal circuits.

Application Field and Its Working Principle

The LM3502SQ-25/NOPB is a PMIC-LED Driver that is ideal for automotive and general illumination applications that require high accuracy currents, such as emergency vehicles and industrial lighting systems. It is suitable for a wide range of applications due to its high output current accuracy, wide input voltage range and integrated protection features.The working principle of the LM3502SQ-25/NOPB is the Current Mode operation (CMO). In this mode, the LM3502SQ-25/NOPB provides the necessary current to drive the LEDs by monitoring its current sense voltage, which is proportional to the current of the LEDs. The parameters that control the current can be configured through external resistors. The LM3502SQ-25/NOPB can connect up to 16 strings, each of which can have up to 8 LEDs in parallel. It works in conditions ranging from –40°C to +125°C and can survive power up surge conditions up to +60V.

Features

The LM3502SQ-25/NOPB provides several features that make it suitable for a wide range of applications. Some of the main features of this PMIC-LED Driver are:• A 4.5 to 40V input voltage range.• 8 strings of 8 LEDs each in parallel, resulting in a total of 64 LEDs.• High current accuracy with ±0.1% for 20mA to 800mA current levels.• Low quiescent current of typically 2.5mA.• Programmable current level accuracy of up to 1.5% differential.• Protection against short-circuit, over-current, over-voltage and under-voltage.• Internal temperature range monitoring and protection.• Fault reporting pin.• Chrome-plated 10-pin, 3mm x 3mm QFN package.

Control Principles

The LM3502SQ-25/NOPB is equipped with a power feedback circuit that measures the current being driven by the IC. The feedback circuit consists of an internal current sense amplifier, a 0.5V reference, an external sense resistor and a compensation network. The control signals of the IC are generated by comparing the output of the current sense amplifier to the internal reference.The current level can be adjusted by varying the external resistors connected to the IC. The required operating current for a particular LED can be set by connecting the resistors for each string in series or in parallel configuration. The same concept can be applied to the entire array by connecting the resistors either in parallel or in series, depending on the application.The current level can also be adjusted dynamically by using a Pulse Width Modulation (PWM) signal. The IC internally detects the signal and adjusts the current level accordingly.

Conclusion

The LM3502SQ-25/NOPB is a PMIC-LED Driver designed by Texas Instruments to drive LEDs in high accuracy applications. This IC has several programmable features that make it suitable for a wide range of applications, such as emergency vehicles and industrial lighting systems. The IC contains a power feedback circuit to provide high accuracy current control and provides programmable current level accuracy of up to 1.5% differential. The IC is also protected against short-circuit, over-current, over-voltage and under-voltage. It is packaged in a 10-pin, 3mm x 3mm QFN package for manufacturing rigidity and is suitable for conditions ranging from –40°C to +125°C.

The specific data is subject to PDF, and the above content is for reference

Part Number	Manufacturer	Price	Quantity	Description