LP5521TM/NOPB Integrated Circuits (ICs)

Dimming:	I²C
Applications:	Backlight
Operating Temperature:	-30°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	20-WFBGA
Supplier Device Package:	20-TuSMD
Base Part Number:	LP5521
Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	DC DC Regulator
Topology:	Switched Capacitor (Charge Pump)
Internal Switch(s):	Yes
Number of Outputs:	3
Voltage - Supply (Min):	2.7V
Voltage - Supply (Max):	5.5V
Voltage - Output:	4.55V
Current - Output / Channel:	25.5mA
Frequency:	1.25MHz

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Introduction to LP5521TM/NOPB

LP5521TM/NOPB, a member of the LP55XX family, is a fully integrated red, green and blue (RGB) LED driver and controller manufactured by Texas Instruments (TI). The LP5521TM/NOPB is designed to provide a complete driver and control solution in a very small package. The combination of very low power consumption, high LED drive and ease of control make it suitable for a variety of applications such as LED display backlights, desktop and laptop computer backlights, and automotive ambient lighting displays.

Application Fields of LP5521/NOPB

The LP5521TM/NOPB is suitable for a wide range of applications. It is mostly used in LED display and backlight applications, such as desktop and laptop computer backlights, automotive ambient lighting displays, and other solid-state lighting solutions. It is also used in wearable products such as fitness trackers and smart watches, as well as white goods.

Features of LP5521TM/NOPB

The main features of the LP5521TM/NOPB include: high efficiency, low quiescent current, wide input voltage range, high drive capability for up to 40mA RGB current per output, up to 16 programmable PWM duty cycle levels and a wide ambient temperature range. It also includes an on-chip multi-tasking sequencer, as well as a temperature sensor, allowing both temperature and LED intensity control, which is especially useful when backlighting LED displays. Additionally, the package integrates an LED safety timer, which can be used to manage the LED lifetime if lifetime criteria need to be met for a specific application.

Working Principle of LP5521TM/NOPB

The LP5521TM/NOPB functions in two distinct modes; high-performance mode and low-power mode. In the low-power mode, the LP5521TM/NOPB uses an on-chip regulator to provide a low current consumption. The low-power mode allows the LED to be powered by an external power source while reducing the overall LED power consumption. In the high-performance mode, the LP5521TM/NOPB integrates a high-efficiency switching regulator and a power control logic block. The device can switch at up to 2MHz, allowing it to drive a wide range of LED backlight displays. The switching regulator also provides low level power consumption and allows the device to operate with a wide range of input voltages. The LP5521TM/NOPB utilizes a several on-chip functions to control the brightness and color of LEDs. These include a multi-tasking sequencer for automatic control of LEDs, a temperature sensor for adjusting brightness based on temperature, as well as a low-power linear mode for manual dimming control.

Conclusion

The LP5521TM/NOPB is an integrated controller and driver solution for driving RGB LEDs. It is used in a wide range of applications and is capable of driving up to 40mA per channel with high efficiency. Furthermore, the device offers a low-power consumption, wide input voltage range and a wide ambient temperature range. Additionally, the LP5521TM/NOPB allows for both temperature and LED intensity control and also has a low-power linear dimming mode.

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