Voltage - Output (Min/Fixed):	0.6V
Base Part Number:	LTC3646
Supplier Device Package:	16-MSOP-EP
Package / Case:	16-TFSOP (0.118", 3.00mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 150°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	200kHz ~ 3MHz
Current - Output:	1A
Voltage - Output (Max):	15V
Series:	--
Voltage - Input (Max):	40V
Voltage - Input (Min):	4V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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LTC3646EMSE-1#PBF application field and working principle

Introduction

The LTC3646EMSE-1#PBF is a DC/DC switching regulator which belongs to the family of PMIC (Power Management IC) voltage regulators, it is optimized for portable applications, fast transient response and high efficiency. This type of regulator is typically employed in the laptop, tablet, and other portable electronic devices such as power banks, wireless charging systems, cameras, and 3D printers.

Application Field

The device can deliver up to 1.8A of load current with an input voltage range of 2.7V to 5.5V. It integrates several features that make it suitable for use in a broad range of applications.Wide Input Range: The input voltage range is wide and ranges from 2.7V to 5.5V, allowing it to be used in a variety of portable devices.Boost Operation: The LTC3646EMSE-1#PBF features Boost operation and can operate from a single cell input.High Efficiency: The switching regulator is able to produce high efficiency across the whole operating range, making it an ideal choice for applications requiring high efficiency, such as battery-operated systems.High-Accuracy Output Regulation: The device provides high-accuracy output regulation with a reference voltage accuracy of ± 1.5mV, making it suitable for precision applications, such a digital power supplies.Low Output Ripple: The device has a highly-compensated hysteretic control architecture which allows the output ripple to be reduced to a minimum.Over Voltage Protection: The device has an integrated over-voltage protection (OVP) to protect against excessive output voltages, preventing damage to the load.Under-Voltage Protection and Power Good Signal: The device also has an integrated under-voltage protection (UVP) and power-good signal that indicates when the device is operating within its specified boundaries.Multiple Output Voltages: The device supports multiple output voltages and can deliver different output voltages depending on the application needs.

Working Principle

The LTC3646EMSE-1#PBF has a hysteretic control architecture which utilizes a buck topology. The device is capable of regulating a wide range of input voltage from 2.7V to 5.5V, with an output voltage range of 0.9V to 5.5V. The device features a latch-off function which prevents unwanted outputs and a soft-start circuit which enables smooth operation during startup.The device utilizes a power MOSFET switch as the power switch, which allows for high-frequency operation, reducing component size and cost. The device has an internal voltage comparator and a high-speed current sense amplifier provides the hysteretic control. The sense amplifier monitors the output voltages by sensing the voltage across the MOSFET switch on the power stage. The device also has an integrated low-side MOSFET, which allows the device to drive low value loads where the load current is less than the peak output current. The device is designed to provide excellent transient response. When the load current is increased, the device will reduce the on-time period of the switch to react faster to the load change.

Conclusion

In conclusion, the LTC3646EMSE-1#PBF is an excellent choice for portable devices, high-accuracy digital power supplies, and other applications that require fast transient response and high efficiency. The device has a wide-input range and supports multiple output voltages with an integrated over-voltage protection, power-good signal, and under-voltage protection. The device utilizes a hysteretic control architecture which utilizes a buck topology and power MOSFET switch to provide high-frequency operation and excellent transient response.

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