LT3502EMS#PBF

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	LT3502
Supplier Device Package:	10-MSOP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	1.1MHz
Current - Output:	500mA
Voltage - Output (Max):	36V
Series:	--
Voltage - Input (Max):	40V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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LT3502EMS#PBF: DC DC Switching Regulators

LT3502EMS#PBF is a DC DC switching regulator that is capable of providing up to 4A over a 0.8V to 15V output voltage range that is adjustable with an external feedback resistor divider. The integrated switching frequency can achieve up to 2MHz, while offering excellent line and load transient responses. It is a 3V to 28V input voltage regulator with high efficiency over a wide range of load conditions and outputs.

Application fields

The LT3502EMS#PBF DC DC switching regulator has diverse applications, such as power supply for small and medium motors, microcontrollers, FPGAs and ASICs, power conversion circuits and consumer electronics. Its low dropout, wide range of output power and adjustable control architecture make it suitable for powering complex circuits. This DC DC switching regulator is also used in LED lighting applications as its high efficiency makes it suitable for replacing traditional incandescent or halogen lighting systems. It is further suitable for driving low power lasers with a low voltage conversion.

Working Principle

The LT3502EMS#PBF DC DC switching regulator works on PWM control with the switching frequency being adjusted by an external resistor. A voltage reference acts in conjunction with an operational amplifier to compare the output voltage with the reference. When the output voltage rises above the set voltage, the error amplifier switches the PMOSFET switch on and off to reduce the output voltage. The frequency of switching is set by an external resistor connected to the PWM input of the regulator. The resistor prevents the voltage reference from saturating, while the capacitor at the PWM input acts to provide loop stability and noise immunity. The output current can be monitored by connecting an external resistor between the SENSE and GND pins. The LT3502EMS#PBF DC DC switching regulator is designed to provide high efficiency and output voltage accuracy. It features external loop compensation, adjustable soft start and adjustable foldback current limit. The low dropout voltage ensures that the input to output voltage differential remains low and improves the overall efficiency of the system.

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