L99LD21Q6TR Integrated Circuits (ICs)

Series:	Automotive, AEC-Q100
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	DC DC Controller, DC DC Regulator
Topology:	Buck, Boost
Internal Switch(s):	Yes
Number of Outputs:	2
Voltage - Supply (Min):	5.5V
Voltage - Supply (Max):	24V
Voltage - Output:	50V
Current - Output / Channel:	1.5A
Frequency:	100kHz ~ 450kHz
Dimming:	PWM
Applications:	Automotive, Lighting
Operating Temperature:	-40°C ~ 150°C (TJ)
Mounting Type:	Surface Mount
Package / Case:	40-TFQFN Exposed Pad
Supplier Device Package:	40-QFN (6x6)

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PMIC - LED DriversThe L99LD21Q6TR is a kind of PMIC - LED Drivers, a high performance triple channel constant current linear driver integrated circuit with a N-Channel FET output. It is specifically engineered to drive a wide range of LEDs in different applications areas. This integrated circuit is highly recommended for high brightness, ultra-high-resolution displays and wide dimming range applications. Besides this, it can also be used in portable device’s battery powered lighting, automotive display, and backlighting applications. The main feature of the L99LD21Q6TR is its output current accuracy, offering precise control and stability of the output current with a nominal accuracy of 2%. It also offers excellent protection against overloads, allowing the chip to monitor the load’s condition and adjust the target current accordingly.The L99LD21Q6TR has a low profile 10-pin SMT package, which can be mounted and easily integrated into applications that use LEDs as light sources. It has also an SPI compatible serial input/output interface for communication with the host microcontroller and a few other external components are required such as LED current sense resistor, input capacitors and inductors, and output capacitors. The L99LD21Q6TR’s working principle is based on the implementation of a voltage-mode control loop. To control the LED current, a current sense amplifier is used to compare the current sense voltage at the output with the reference voltage. An internal Op-Amp will be used to close the control loop, sensing the current sense voltage and controlling the voltage at the output to match it and thus maintain the desired current.The IC also has an on-board protection feature. This is a safe guard against current over-drive and short circuit situations, helping to protect the device and the LEDs. The protection circuit will turn off the outputs if any of these situations occurs. The L99LD21Q6TR provides a wide dimming range. The output current can be set up as low as 5mA or as high as 500mA with the use of the external resistors. This gives a great versatility of applications, making it suitable to be used in a multitude of lighting solutions.To sum up, the L99LD21Q6TR is a high performance triple channel constant current linear driver integrated circuit specifically designed for LED lighting applications, which offers high accuracy and wide dimming range. Its main features are its output current accuracy, small size, automated safety feature, and flexible interface. Its working principle is based on the implementation of a voltage-mode control loop, and its protection feature ensures a safe operation and help to protect the device and the LEDs against overloads.

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