LM1085IS-ADJ

Current - Output:	3A
Base Part Number:	LM1085
Supplier Device Package:	DDPAK/TO-263-3
Package / Case:	TO-263-4, D²Pak (3 Leads + Tab), TO-263AA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	75dB (120Hz)
Current - Quiescent (Iq):	10mA
Series:	--
Voltage Dropout (Max):	1.5V @ 3A
Voltage - Output (Max):	15V
Voltage - Output (Min/Fixed):	1.25V
Voltage - Input (Max):	29V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Not For New Designs
Packaging:	Tube

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Introduction

The LM1085IS-ADJ is a linear voltage regulator developed by Texas Instruments that features a wide input voltage range and is suitable for use in various applications such as in general purpose power supplies, automotive power supplies, commercial and consumer electronic equipment, and industrial applica-tions. The device integrates a low on-resistance, low RDS (on), low dropout (LDO) voltage regulator with adjustable output voltage range, and it is capable of providing up to 1.5A of output current.

Overview

The LM1085IS-ADJ is a voltage regulator optimized for use in space-constrained applications that require an adjustable output voltage from 1.2V to 32V. It provides improved line and load regulation over the popular LM1117 series due to the low RDS (on) of the external power MOSFET selection. Other key features include the current-limiting protection, the thermal shutdown, and the remote sensing capability.The output voltage can be adjusted via an external potentiometer connected between the ADJ and ground pins, allowing the user to fine-tune the voltage to the desired level. The remote sensing capability compensates for voltage drops along the power-supply line, ensuring that the load receives the correct output voltage. The device also has a current-limiting protection circuit that will shut down the internal MOSFET if the output current exceeds the specified limit.The LM1085IS-ADJ offers several advantages over other linear voltage regulators in a space-constrained application. It has a low on-resistance (RDS (on)) of 0.04 Ω, a low dropout voltage of 0.2V, and it operates in a wide temperature range from -40°C to +85°C. It also has a low quiescent current of 36 μA, which is ideal for energy-sensitive applications.

Applications

The LM1085IS-ADJ is suitable for use in industrial and commercial applications requiring an adjustable output voltage, such as digital power supplies, lighting systems, battery chargers, automotive applications, and other power supplies.

Features

The LM1085IS-ADJ provides several features to improve the performance of the device:• Low operating current: The device has a low quiescent current of 36 μA, making it suitable for low-power applications.• Wide operating temperature range: The device operates over a wide temperature range from -40°C to +85°C.• Low dropout voltage: The device has a low dropout voltage of 0.2V, which ensures high efficiency.• Low RDS (on): The device has a low on-resistance (RDS (on)) of 0.04Ω, ensuring high efficiency.• Current-limiting protection: The device has a current-limiting protection feature to prevent overcurrent conditions.• Thermal shutdown: The device has a thermal shutdown feature to protect the device from overheating.• Remote sensing: The device has a remote sensing capability to compensate for voltage drops along the power-supply line.

Working Principle

The LM1085IS-ADJ is a low dropout voltage regulator that uses an external power MOSFET to regulate the output voltage. The output voltage is adjusted using an external potentiometer connected between the ADJ and ground pins. The power MOSFET is turned on and off to regulate the output voltage. When the output voltage is lower than the set point, the power MOSFET is turned on to increase the load voltage. When the output voltage is higher than the set point, the power MOSFET is turned off to reduce the load voltage.The LM1085IS-ADJ also has a remote sense feature to compensate for voltage drops along the power-supply line. For this, the output voltage at the load is sensed and compared with the voltage at the device’s output pin. If they differ, the output voltage is adjusted to maintain the load voltage.

Conclusion

The LM1085IS-ADJ is a linear voltage regulator developed by Texas Instruments that offers improved line and load regulation over the popular LM1117 series due to the low RDS (on) of the external power MOSFET selection. Its low quiescent current and low dropout voltage make it an ideal choice for space-constrained applications requiring an adjustable output voltage from 1.2V to 32V. The device has current-limiting protection, thermal shutdown, and remote sensing capabilities to ensure reliable power regulation.

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