LTC3541EDD-1#PBF

Voltage/Current - Output 3:	--
Base Part Number:	LTC3541
Supplier Device Package:	10-DFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	0.9 V ~ 5.5 V
w/Sequencer:	Yes
w/Supervisor:	No
w/LED Driver:	No
Series:	--
Voltage/Current - Output 2:	0.4 V ~ 4.1 V, 300mA
Voltage/Current - Output 1:	0.8 V ~ 5 V, 500mA
Frequency - Switching:	2.25MHz
Number of Outputs:	2
Function:	Any Function
Topology:	Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
Part Status:	Active
Packaging:	Tube

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LTC3541EDD-1#PBF application field and working principle

The LTC3541EDD-1#PBF is a low-noise, high efficiency, dual-mode synchronous boost regulator with wide input voltage range. It integrates a low-noise dual-mode inductor-based DC-DC stage with a wide-operating-range linear regulator, requiring only two external components—an inductor and a single-mode-capacitor. This new regulator operates in either linear or 2-mode boost mode, allowing a low quiescent current of only 20µA in linear mode and 500µA in boost mode for low power applications. It features an internal voltage reference and adjustable current limit for each of the outputs, allowing for very efficient operation over a wide range of output voltages and currents.

Features of the LTC3541EDD-1#PBF

The LTC3541EDD-1#PBF is ideal for powering applications such as wearables, IoT nodes, audio/video equipment, and battery-powered medical devices. It is equipped with several features to ensure the highest level of efficiency and accuracy:• Dual-mode Intelligent FET Controller with integrated current sense and voltage regulation loop• Low-noise linear regulator with adjustable output voltage• Wide input voltage range: 2.7V - 4.5V• Output voltage range of 0.6V–5V• Maximum output current of up to 1.5A• Output current limit 2A for Linear Mode and 3A for Boost Mode• Low quiescent current of only 20µA in linear mode and 500µA in boost mode• Integrated voltage reference and adjustable-current limit• Soft-start and tracking capabilities

Working Principle of the LTC3541EDD-1#PBF

The LTC3541EDD-1#PBF dual-mode synchronous boost regulator uses a constant-on-time Charge Pump-based control architecture to optimize efficiency and transient performance. In its standard operating mode, the device actively regulates the output voltage. When the input voltage is low, the LTC3541EDD-1#PBF seamlessly transitions to 2-mode boost operation to provide maximum efficiency across the entire input voltage range.For low-noise applications, the linear regulator is optimized to provide a low-noise, low-ripple output voltage with no additional external components. The linear regulator has adjustable output voltage, current limit and inrush current limiting. An internal 5-bit digital-to-analog converter (DAC) is used to set the output voltage. The current limit is set by external resistors and is adjustable from 1A to 3A. The device has a built-in soft-start feature that can be used to reduce any inrush current at start up.

Conclusion

The LTC3541EDD-1#PBF is an ideal low-noise, high efficiency, dual-mode synchronous regulator for powering applications such as wearables, IoT nodes, audio/video equipment, and battery-powered medical devices. It features an adjustable output voltage and integrated current sense and voltage regulation loop, a wide input voltage range of 2.7V - 4.5V, maximum output current of up to 1.5A, low quiescent current of only 20µA in linear mode and 500µA in boost mode, and adjustable current limit. Its unique constant-on-time Charge Pump-based control architecture offers maximum efficiency across a wide range of input voltages and provides excellent transient performance.

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