LT3741EFE#TRPBF

Frequency - Switching:	200kHz ~ 1MHz
Base Part Number:	LT3741
Supplier Device Package:	20-TSSOP-EP
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	6 V ~ 36 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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The LT3741EFE#TRPBF is a DC-DC switching controller, also known as a voltage regulator, that is capable of solving various power supply challenges such as hot shuttle, short duration steep transients, current rail overflow, and negative duty cycle. The device is optimized to achieve high efficiency levels and a low operating temperature in a compact package, with the ability to sync with an external oscillator or switch frequencies up to 2.5 MHz. Due to its versatility, it can be applied in a variety of applications.

Features and Benefits

• Wide-Input Voltage Range: 4.5V to 15V
• Frequency Sync with External Clock: 10kHz to 2.5MHz (LT3741)
• Integrated Over-Temperature Protection: Reduces power dissipation and extends operating life.
• Low RDS(ON) Internal MOSFETs: Removes the need for an external FET, reducing total solution cost.
• Small Package Size: 10-Pin, 2mm × 3mm DFN and 8-Pin, 3mm × 3mm DFN solutions.
• Fixed Frequency Synchronous Operation: Minimizes output ripple and energy losses, reducing total solution cost.

Applications

Due to its features and implementation flexibility the LT3741EFE#TRPBF has a wide range of potential applications, particularly in portable and hand held devices. These applications include:

• Wireless Charging: The device can be used in wireless charging circuitry, such as Qi-compliant systems, in order to attain high levels of efficiency.
• Portable Battery Management: The device is well suited to battery charging and power management, such as portable medical systems.
• Low-Power Portable Electronics: Digital audio players, digital light displays, and other portable electronics can benefit from the LT3741EFE#TRPBF in maximizing performance with low heat dissipation and footprint.
• LED Lighting: The LT3741EFE#TRPBF can be used as a boost converter in LED lighting systems, providing smooth and efficient dimming with low noise.

Working Principle: Inverting Synchronous Boost Switching Controller

The LT3741 uses a fixed-frequency, inverting synchronous boost switching controller. It requires an external clock, either a single-ended (Unipolar) or a differentialclock. The external clock frequency can range from 10 kHz up to 2.5 MHz (LT3741). The LT3741 could be used to invert a voltage in less than 2 μs and with a frequency as high as 2.5 MHz, thus eliminating input capacitors.

The LT3741EFE#TRPBF achieves high efficiency by self-adjusting Pulse Width Modulation (PWM) switching frequency with Temperature Compensated Flip-Flop Hysteresis (TCFFH). The LT3741’s hysteresis feature can track switching frequency automatically based on the input voltage for better efficiency and noise performance. For analog diming, the LT3741EFE#TRPBF integrates a dimming Pin that adjusts the frequency from 200Hz down to 10Hz, which allows users to implement different switching frequency to control different brightness of LEDs.

The integrated MOSFET driver in the LT3741EFE#TRPBF has several enabling options that allow the device to be used in a variety of applications. The device offers a PWM input and a single-ended or differential-clock input configuration. In terms of protection, the LT3741EFE#TRPBF incorporates a thermal protection circuit that limits the temperature of the die. The thermal protection circuit sets the maximum operating junction temperature range between -55°C to +125°C.

Conclusion

The LT3741EFE#TRPBF is a highly efficient synchronous DC-DC switching controller. With features such as wide-input voltage range and adjustable switching frequency, the LT3741EFE#TRPBF is ideal for applications in the fields of wireless charging circuitry, battery charging, and LED lighting. With its high efficiency, low operating temperature and small package size, the LT3741EFE#TRPBF offers a versatile solution for achieving a variety of power management solutions.

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