LT3680HMSE#TRPBF

Voltage - Output (Min/Fixed):	0.79V
Base Part Number:	LT3680
Supplier Device Package:	10-MSOP-EP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 150°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	230kHz ~ 2.45MHz
Current - Output:	3.5A
Voltage - Output (Max):	30V
Series:	--
Voltage - Input (Max):	36V
Voltage - Input (Min):	3.6V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT3680HMSE#TRPBF Application Field and Working Principle

The LT3680HMSE#TRPBF is an adjustable, step-up/step-down DC/DC switching regulator that operates from an input voltage of as low as 0.7V to beyond 5V. Typical application fields include portable electronic devices and hand-held electronics powered by a single-cell Li-ion or 2-cell alkaline battery. This regulator is particularly suitable for use with supercapacitors, which often experience large capacitance drops over temperature and cycle.The LT3680HMSE#TRPBF is unique in its external component count, with only 10 external components needed. Internal features are integrated to conserve power and reduce external component size, while providing high efficiency and robust performance. The device is offered in fine-pitch, thermally enhanced 20-lead eMLP (HT) and 16-pad TSSOP (LT) packages, which are designed to improve dissipation and reduce thermal resistance.

Working Principle

The LT3680HMSE#TRPBF switching regulator employs synchronous rectification to increase its efficiency over a wide range of input and output voltages. It is designed to optimize the efficiency while providing robust regulation with low output voltages over a wide range of temperatures.The LT3680HMSE#TRPBF uses a 400KHz or 600KHz high frequency switching frequency for minimizing the size of the power-stage components, minimizing the noise and minimizing heat dissipation. It also employs a control scheme to optimize the switching frequency, reducing the peak current when the load is light and reducing energy losses.The input and output voltage levels are regulated by an internal reference bandgap voltage. This voltage is regulated by an external resistor divider connected to pin 1 and 8. The reference voltage at pin 4 is compared to the voltage which is obtained by dividers consisting of resistor R2 and R5. The comparison result is used to control the internal error amplifier and control the switching frequency.The LT3680HMSE#TRPBF features an adjustable maximum duty cycle which helps to reduce the output voltage when a low input voltage and a high output voltage are imposed. It also features current limit circuitry and adjustable cycle-by-cycle current limiting to ensure that it can meet the needs of the application.

Conclusion

The LT3680HMSE#TRPBF is an adjustable, step-up/step-down DC/DC switching regulator that operates from an input voltage as low as 0.7V to beyond 5V. It provides an external component count of 10 and is thermally enhanced using 20-lead eMLP (HT) or 16-pad TSSOP (LT) packages. It is designed with synchronous rectification, 400KHz or 600KHz high-frequency switching frequency, and adjustable maximum duty cycle to provide efficient operation and robust regulation. The high-frequency switching, low external component count and low power dissipation makes the LT3680HMSE#TRPBF a suitable candidate for a range of applications, particularly portable electronic devices.

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