LT3475IFE-1#PBF

Voltage - Supply (Max):	36V
Base Part Number:	LT3475
Supplier Device Package:	20-TSSOP-EP
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TA)
Applications:	Automotive, Backlight, Lighting
Dimming:	PWM
Frequency:	200kHz ~ 2MHz
Current - Output / Channel:	1.5A
Voltage - Output:	--
Series:	--
Voltage - Supply (Min):	3.7V
Number of Outputs:	2
Internal Switch(s):	Yes
Topology:	Step-Down (Buck)
Type:	DC DC Regulator
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Tube

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The LT3475IFE-1#PBF is a high frequency, constant gap ratio, step-up LED driver, designed for driving a wide range of LED applications. It is an ideal device for power-limited applications, such as handheld and battery-powered devices, as it requires minimal external components and can efficiently boost input voltages from 2.75 V up to 20 V. In this article we will look at the application field of the LT3475IFE-1#PBF and the working principle of this device.

Application field

The LT3475IFE-1#PBF has a wide range of applications, including automotive exterior and interior lighting, illumination, LCD backlighting, and signage. It can be used as a DC-DC converter to power a variety of LEDs, including high-power Luxeon, and other lighting components. Additionally, the device can be used to drive pre-charged high-brightness LED strings where the desired current is known and controlled. The device requires minimal external components and has excellent thermal performance. It can operate over an ambient temperature range of -40°C to +125°C and can deliver best in class temperature regulation. Furthermore, it offers a wide VIN range of 2.75 V to 20 V, allowing it to be used in applications where input and output voltages are separated.

Working Principle

The LT3475IFE-1#PBF has a unique working principle, which utilizes a Boost architecture, to automatically control the gap ratio (GR) of the output current, while still providing a high efficiency. The internal control loop maintains a predetermined ratio between the output and the reference voltage, allowing the device to operate with input voltages that may go up or down. The device also utilizes a dedicated current sense pin, which is able to sense the output current and set the gap ratio accurately. The device has a 1A high-side switch, which can be used to regulate the power delivered to the LEDs, as well as an integrated frequency folding circuit. This ensures a low ripple current and high average current at the output.

Conclusion

The LT3475IFE-1#PBF is a high frequency, constant gap ratio, step-up LED driver, designed for driving a wide range of LED applications. It requires minimal external components and has excellent thermal performance, and can operate with input voltages of 2.75 V to 20 V. In addition, it utilizes a unique working principle, which utilizes a Boost architecture, to automatically control the gap ratio (GR) of the output current, while still providing a high efficiency. As such, the LT3475IFE-1#PBF can be used in a variety of applications and is an ideal device for power-limited applications.

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