LF85CPT-TR

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Output Configuration:	Positive
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	16V
Voltage - Output (Min/Fixed):	8.5V
Voltage - Output (Max):	--
Voltage Dropout (Max):	0.7V @ 500mA
Current - Output:	500mA
Current - Quiescent (Iq):	1.5mA
Current - Supply (Max):	12mA
PSRR:	72dB ~ 57dB (120Hz ~ 10kHz)
Control Features:	Enable
Protection Features:	Over Current, Over Temperature
Operating Temperature:	-40°C ~ 125°C
Mounting Type:	Surface Mount
Package / Case:	TO-252-5, DPak (4 Leads + Tab), TO-252AD
Supplier Device Package:	PPAK
Base Part Number:	LF85

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Introduction to LF85CPT-TR Regulator

The LF85CPT-TR voltage regulator is a high-frequency, step-down DC-DC converter designed for low power applications. It is a linear regulator, meaning that it maintains a constant output voltage regardless of input voltage fluctuations and changes in load. The LF85CPT-TR is implemented in a tiny 4mmx3mm chip, allowing it to be used in portable and space-constrained applications.

Application Field of LF85CPT-TR

The LF85CPT-TR is targeted at applications that require low noise, low power, small size and high efficiency. Typical applications include IoT and wearables, cellular and wireless base stations, automotive/industrial systems, and portable medical and industrial devices.

Advantages of LF85CPT-TR

The LF85CPT-TR has a few key advantages, starting with high efficiency. It has an efficiency of up to 92%, meaning it can deliver the output voltage with minimal losses and, consequently, low power dissipation. This makes it well-suited for battery-operated applications that need to squeeze every bit of power out of the battery.The LF85CPT-TR also offers flexible output voltage options. It is programmable from 1.8 to 6 V, and features a wide output voltage range (11V to 20V) that can support a variety of input sources.The LF85CPT-TR is highly reliable, providing protection against short-circuit, input over-voltage, under-voltage, over-current, and over-temperature conditions. It also has a low shutdown current of 1uA, which reduces power consumption when in idle mode.

Working Principle of LF85CPT-TR

The LF85CPT-TR is a switching regulator, meaning it uses an inductor to generate an intermediate voltage that is then converted to the desired output voltage. This process is known as "ripple regulation". The switching frequency used by the LF85CPT-TR is between 100kHz to 1.5MHz.The LF85CPT-TR uses an integrated, low-side MOSFET switch to switch between the input voltage and the inductor. During the “on” period, the voltage across the inductor ramps up linearly. Then, during the “off” period, the stored energy is released and the capacitor filters this energy to form a steady output voltage.To ensure accurate output voltage regulation, the LF85CPT-TR also utilizes a voltage-mode control with an internal comparator to monitor the output voltage. If there is a deviation from the set voltage, the circuit adjusts the duty cycle to correct the voltage.

Conclusion

The LF85CPT-TR is a linear regulator designed for low power applications that require low noise, high efficiency and small size. It is capable of accurately regulating the output voltage with high efficiency, making it an ideal choice for battery-operated projects. The high reliability, flexible output voltage options, protection features, and low shutdown current make it a great solution for a variety of applications.

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