LTC3404EMS8#TRPBF

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	LTC3404
Supplier Device Package:	8-MSOP
Package / Case:	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	1.4MHz
Current - Output:	600mA
Voltage - Output (Max):	6V
Series:	--
Voltage - Input (Max):	6V
Voltage - Input (Min):	2.65V
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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The LTC3404EMS8#TRPBF is a high efficiency, synchronous monolithic buck regulator developed by Linear Technology Corporation, which integrates output current sensing, programmable soft-start and input power limit protection in a 6-pin package. It serves multiple application fields, primarily as a PMIC (Power Management IC) voltage regulator and DC/DC switching regulator.The device\'s high efficiency over a wide range of load currents is attained by integrating a MOSFET switch onto the IC die. The IC is designed to deliver up to 4A output current, with an efficiency up to 96% at 3V input and 3.3V output. The device\'s operating temperature range is -40°C to +125°C.Working principleThe LTC3404EMS8#TRPBF operates from a 2.7V to 5.5V wide range supply voltage, and its output can be configured to any output voltage between 0.6V and the input Voltage.In PWM (pulse width modulation) mode, the device pulses the MOSFET between the input voltage and the output voltage. At no load, the output will remain in the same state as the input voltage. The output voltage is regulated by modulating the on-time of the MOSFET switch and the duty cycle of the cycle. The timing of the MOSFET pulse is generated internally by oscillator and clock circuits.When the load is applied, the output voltage will degrade to some extent, and the controller will respond by increasing the duty cycle and stay in balance between minimum duty cycle (minimum on-time) and the maximum duty cycle. This is what is known as pulse-width modulation.The device features two protection circuits, a programmable soft-start for limiting inrush current at start-up, and an overcurrent protection circuit that provides an adjustable overcurrent limit which forces the cycle times to exceed an adjust-level before the output fully resumes. There is also an input power limit which prevents the output voltage from exceeding the input voltage if excessive load current is applied.ConclusionThe LTC3404EMS8#TRPBF is a highly efficient 6-pin monolithic buck regulator designed primarily as a PMIC (Power Management IC) voltage regulator and DC/DC switching regulator. It is capable of delivering up to 4A output current over a wide range of input supply voltages, with an efficiency up to 96% at 3V input and 3.3V output. The device features two protection circuits to ensure safe operation and includes programmable soft-start and overcurrent protection for better performance and efficiency.

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