Voltage - Output (Min/Fixed):	-1.24V
Base Part Number:	LT1614
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:	No
Frequency - Switching:	600kHz
Current - Output:	750mA (Switch)
Voltage - Output (Max):	-24V
Series:	--
Voltage - Input (Max):	5V
Voltage - Input (Min):	1V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost, Charge Pump, Cuk
Output Configuration:	Negative
Function:	Step-Up, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tube

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DC DC Switching Regulators: LT1614IMS8#PBF

DC-DC switching regulators are integrated circuits with a wide range of applications, ranging from automotive electronics to consumer electronics. The LT1614IMS8#PBF (LTC) is a synchronous step-down (buck) switching regulator with an input voltage range of 4.5 V to 15 V and an output voltage range of 0.8 V to 12 V. It offers up to 5 A of continuous load current and an adjustable switching frequency of 200 kHz to 2 MHz. The device also incorporates a synchronous rectification scheme that improves the efficiency over traditional linear regulators. The LT1614IMS8#PBF features a variety of inrush-control and short circuit protection features.

Working Principle

The LT1614IMS8#PBF operates by converting an input voltage to a lower output voltage using a switching converter topology. A switching converter typically consists of an inductor, two power transistors (high side and low side), an output capacitor, and a control circuit. The switching frequency of the device is adjustable and is typically set by a resistor or potentiometer. The internal controller of the LT1614IMS8#PBF drives the power transistors (typically MOSFETs) to alternately turn on and off with a duty cycle that is controlled by a voltage loop. The inductor is used to store energy and filter the output voltage. The output capacitor is used to reduce the output voltage ripple. When the low side transistor is off, energy stored in the inductor is released to the output capacitor. When the low side transistor is on, the energy stored in the inductor is discharged to ground.The device can handle input voltages from 4.5 V to 15 V and output voltages from 0.8 V to 12 V. When the output voltage is set to the same value as the input voltage the device operates in a so-called ‘2-quadrant’ topology, meaning it is able to both step-down and step-up the input voltage.

Protection Circuitry

The LT1614IMS8#PBF contains various protection circuitry to protect against various faults or conditions. It includes inrush control, overcurrent protection, and overtemperature protection.The device includes an integrated synchronous rectifier controller. This controller improves efficiency in certain applications, and allows the use of a low on-resistance MOSFET for the low side transistor. This reduces power dissipation, as well as self-heating and peak temperature in the MOSFETs.The device also includes a programmable switching frequency, allowing the user to choose the optimal frequency for their application. The switching frequency can be set between 200 kHz and 2 MHz with an external resistor or potentiometer.

Applications

The LT1614IMS8#PBF is well suited for a variety of applications, including automotive, consumer, industrial, and communications systems. It can be used to provide reliable and efficient voltage conversion in systems such as battery management, motor control, and motor drives. It can also be used as a power supply for RF components, FPGAs, or microprocessors.The LT1614IMS8#PBF is a compact device that is ideal for space-constrained applications. It is designed to operate over an extended temperature range, making it well suited for applications that require high reliability under extreme temperature conditions.

Conclusion

The LT1614IMS8#PBF is a synchronous step-down DC-DC switching regulator with an adjustable switching frequency and integrated short-circuit protection circuits. It can accept input voltages up to 15 V and provides output voltages from 0.8 V to 12 V. The device includes synchronous rectification circuitry to improve system efficiency and reduce power dissipation. It is well suited for a variety of applications, including automotive, consumer, industrial, and communications systems.

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