LP3943ISQ Integrated Circuits (ICs)

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Not For New Designs
Type:	Power Switch
Topology:	Shift Register
Internal Switch(s):	Yes
Number of Outputs:	16
Voltage - Supply (Min):	2.3V
Voltage - Supply (Max):	5.5V
Voltage - Output:	--
Current - Output / Channel:	25mA
Frequency:	--
Dimming:	I²C, SMBus
Applications:	Camera Flash
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	24-WFQFN Exposed Pad
Supplier Device Package:	24-WQFN (4x4)
Base Part Number:	LP3943

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LP3943ISQ Application Field and Working Principle

LP3943ISQ is a type of PMIC – LED Drivers. It is a low-powered controller and is designed for directly driving high-current LEDs or dimmable backlight application.LP3943ISQ is manufactured by the semiconductor company, which is the most important application maker in the field of LED drivers. This PMIC-LED driver is based on a patented, high-performance technology and provides customers with innovative products that meet the industry\'s highest standards of LED lighting.The main features of LP3943ISQ include low dropout voltage operation, high efficiency, and a wide current range. The LP3943ISQ is suitable for driving multiple LEDs with separately adjustable current up to 12.7 W at 36 V per channel. It also allows individual LED brightness control by setting the appropriate current level for each LED in the LED system. Additionally, the LP3943ISQ has a pulse width modulation control system that can provide adjustable PWM rate.The LP3943ISQ is designed to operate at high output voltage and current levels for LED applications. It is equipped with a low-power, voltage-mode controller that uses an integrated pulse width modulation (PWM) signal for constant current control. The LP3943ISQ can be easily adapted to most current power supplies such as DC/DC boost converters and linear regulators. It also supports forward, buck and buck-boost topologies.The LP3943ISQ is capable of driving high-current LEDs with constant current sources of up to 12.5 A per channel. It has a wide voltage input range so it can be used with both single-voltage and multi-voltage systems. The constant current source has adjustable current limit and PWM control.In terms of its working principle, the LP3943ISQ is designed for LED applications with a low-power voltage-mode constant-current controller. The constant-current power output is generated by an integrated high-side Power MOSFET, which needs no external components. The implemented control circuit includes a current-sense amplifier, a voltage-mode PWM controller, and a positive-feedback compensation network. The current setting of the LED string is adjusted by a “programmable current setting” pin.Furthermore, the LED current is output by a dedicated constant-current source, which accurately maintains a constant current level according to the user’s setpoint. The over-temperature protection of the control circuit provides improved system reliability.Overall, the LP3943ISQ is the ideal PMIC-LED driver for constant-current LED applications. It has a wide voltage input range and current output range, along with a low power consumption, high efficiency, and adjustable current limit and PWM controls. These features make the LP3943ISQ a great choice for commercial, industrial, and automotive lighting applications.

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Part Number	Manufacturer	Price	Quantity	Description