LT3970HMS#PBF

Voltage - Output (Min/Fixed):	1.21V
Base Part Number:	LT3970
Supplier Device Package:	10-MSOP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 150°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	200kHz ~ 2.25MHz
Current - Output:	535mA (Switch)
Voltage - Output (Max):	25V
Series:	--
Voltage - Input (Max):	40V
Voltage - Input (Min):	4.2V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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LT3970HMS#PBF application field and working principleLT3970HMS#PBF is a family of high-efficiency DC to DC converters that are designed to deliver precise regulation at high frequencies while operating in extreme conditions. The high-side switch and low-side switch in the converter produce a step down conversion from high input voltage to low output voltage. Besides that, it can also generate regulated output current. The high-side switch is a P-channel MOSFET, which is activated by an internal or external control signal. When the switch is on, current is allowed to flow from the input supply to the output, and the voltage across the inductor is increased exponentially. The current through the inductor is sensed by the current sense resistor which enables the control system of the device to regulate the output. The low-side switch is a N-channel MOSFET, which is activated by an internal control signal. When the current amplitude through the inductor reaches the desired value, the low-side switch turns on, allowing the current to bypass the inductor and create a regulated output. This switching action also induces a flyback voltage, which is used by the LT3970HMS#PBF to control the output voltage and current.The LT3970HMS#PBF is designed to offer an adjustable output voltage, a ripple rejection of 105 dB, and a typical efficiency of 95%. Its features make it suitable for a wide range of applications, including notebook computers and LCD TVs. The device also has a range of protection features such as output overvoltage protection, current limit protection and programmable soft-start. The soft-start feature helps reduce the inrush current and output ripple by slowly ramping up the output voltage from startup. It also prevents overshoot, allowing the device to operate from an input voltage that is very close to the output voltage.Overall, the LT3970HMS#PBF is a high-efficiency, high-performance DC-DC switching regulator that provides an ideal solution for a wide range of applications in the Power Management Integrated Circuit (PMIC) - Voltage Regulators - DC DC Switching Regulators category.

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