LT1085 Low Dropout Positive Regulators: Datasheet, Circuit and Replacement
PMIC T
LT1085 is a positive adjustable Low Dropout Linear voltage regulator designed to provide an output current of 3A with higher efficiency than currently available devices. This article mainly covers pinout, datasheet, circuit, replacement, and other details about LT1085 low dropout regulators. Furthermore, there is a huge range of semiconductors, capacitors, resistors, and ICs in stock. Welcome your RFQ!

Voltage regulator tutorial & USB gadget charger circuit
LT1085 Description
The LT1085 is a positive adjustable Low Dropout Linear voltage regulator that has greater efficiency than currently available devices and can produce an output current of 3A. The input voltage ranges from 2.55V to 30V, and the output voltage can be adjusted. The LT1085 is offered in three different packages: TO-220, DD, and 3-Lead Plastic TO-220.
LT1085 Pinout

LT1085 Pinout
| Pin No. | Pin Name | Description |
| 1 | ADJ/GND | Adjustable pin for adjusting output version. Ground for fixed type version |
| 2 | OUTPUT | Output Voltage Pin |
| 3 | INPUT | Input Voltage Pin |
LT1085 CAD Model

LT1085 Footprint
Specifications
- TypeParameter
- Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
T - Number of Pins3
- Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Bulk - Max Operating Temperature
The Maximum Operating Temperature is the maximum body temperature at which the thermistor is designed to operate for extended periods of time with acceptable stability of its electrical characteristics.
150°C - Min Operating Temperature
The "Min Operating Temperature" parameter in electronic components refers to the lowest temperature at which the component is designed to operate effectively and reliably. This parameter is crucial for ensuring the proper functioning and longevity of the component, as operating below this temperature may lead to performance issues or even damage. Manufacturers specify the minimum operating temperature to provide guidance to users on the environmental conditions in which the component can safely operate. It is important to adhere to this parameter to prevent malfunctions and ensure the overall reliability of the electronic system.
-40°C - Number of Outputs1
- Polarity
In electronic components, polarity refers to the orientation or direction in which the component must be connected in a circuit to function properly. Components such as diodes, capacitors, and LEDs have polarity markings to indicate which terminal should be connected to the positive or negative side of the circuit. Connecting a component with incorrect polarity can lead to malfunction or damage. It is important to pay attention to polarity markings and follow the manufacturer's instructions to ensure proper operation of electronic components.
Positive - Operating Supply Current
Operating Supply Current, also known as supply current or quiescent current, is a crucial parameter in electronic components that indicates the amount of current required for the device to operate under normal conditions. It represents the current drawn by the component from the power supply while it is functioning. This parameter is important for determining the power consumption of the component and is typically specified in datasheets to help designers calculate the overall power requirements of their circuits. Understanding the operating supply current is essential for ensuring proper functionality and efficiency of electronic systems.
5mA - Power Dissipation
the process by which an electronic or electrical device produces heat (energy loss or waste) as an undesirable derivative of its primary action.
30W - Current - Output
Current - Output is a parameter in electronic components that refers to the maximum amount of current that can be delivered by the output of the component. It is a crucial specification as it determines the capability of the component to supply power to connected devices or circuits. The current output rating is typically specified in amperes (A) and is important for ensuring that the component can safely and effectively power the load it is connected to without overheating or failing. Designers and engineers must consider the current output rating when selecting components to ensure compatibility and reliable operation of the overall system.
3A - Max Output Voltage
The maximum output voltage refers to the dynamic area beyond which the output is saturated in the positive or negative direction, and is limited according to the load resistance value.
28.5V - Voltage - Output
Voltage - Output is a parameter that refers to the electrical potential difference between the output terminal or pin of an electronic component and a reference point, typically ground. It indicates the level of voltage that the component is capable of providing at its output under specified operating conditions. This parameter is crucial in determining the performance and functionality of the component in a circuit, as it directly affects the signal or power being delivered to other components or devices connected to the output. Engineers and designers use the voltage output specification to ensure compatibility and proper functioning of the component within the overall system.
28.5V - Number of Regulators
A regulator is a mechanism or device that controls something such as pressure, temperature, or fluid flow. The voltage regulator keeps the power level stabilized. A regulator is a mechanism or device that controls something such as pressure, temperature, or fluid flow.
1 - Min Input Voltage
The parameter "Min Input Voltage" in electronic components refers to the minimum voltage level that must be applied to the component for it to operate within its specified parameters. This value is crucial as providing a voltage below this minimum threshold may result in the component malfunctioning or not functioning at all. It is important to adhere to the specified minimum input voltage to ensure the proper operation and longevity of the electronic component. Failure to meet this requirement may lead to potential damage to the component or the overall system in which it is used.
2.55V - Max Input Voltage
Max Input Voltage refers to the maximum voltage level that an electronic component can safely handle without getting damaged. This parameter is crucial for ensuring the proper functioning and longevity of the component. Exceeding the specified maximum input voltage can lead to overheating, electrical breakdown, or permanent damage to the component. It is important to carefully adhere to the manufacturer's guidelines regarding the maximum input voltage to prevent any potential issues and maintain the reliability of the electronic device.
30V - Dropout Voltage
Dropout voltage is the input-to-output differential voltage at which the circuit ceases to regulate against further reductions in input voltage; this point occurs when the input voltage approaches the output voltage.
1.3V - Min Output Voltage
Min Output Voltage refers to the lowest voltage level that an electronic component, such as a voltage regulator or power supply, can provide reliably under specified conditions. It indicates the minimum threshold required for proper operation of connected devices. Operating below this voltage may lead to device malfunction or failure to operate as intended.
1.25V - Power Supply Rejection Ratio (PSRR)
Power Supply Rejection Ratio (PSRR) is a measure of how well an electronic component, such as an operational amplifier or voltage regulator, can reject changes in its supply voltage. It indicates the ability of the component to maintain a stable output voltage despite fluctuations in the input supply voltage. A higher PSRR value signifies better performance in rejecting noise and variations from the power supply, leading to improved signal integrity and more reliable operation in electronic circuits. PSRR is typically expressed in decibels (dB).
75dB - Min Current Limit
Min Current Limit is a parameter in electronic components that refers to the minimum amount of current that must flow through the component to ensure proper operation. This parameter is important because if the current falls below this limit, the component may not function as intended or may even be damaged. Manufacturers specify the minimum current limit to help users understand the operating conditions and limitations of the component. It is crucial to ensure that the current flowing through the component remains above the specified minimum limit to maintain its performance and reliability.
3.2A - Radiation Hardening
Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation, especially for environments in outer space (especially beyond the low Earth orbit), around nuclear reactors and particle accelerators, or during nuclear accidents or nuclear warfare.
No - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
RoHS Compliant - Lead Free
Lead Free is a term used to describe electronic components that do not contain lead as part of their composition. Lead is a toxic material that can have harmful effects on human health and the environment, so the electronics industry has been moving towards lead-free components to reduce these risks. Lead-free components are typically made using alternative materials such as silver, copper, and tin. Manufacturers must comply with regulations such as the Restriction of Hazardous Substances (RoHS) directive to ensure that their products are lead-free and environmentally friendly.
Contains Lead
LT1085 Block Diagram
The following is the block diagram of LT1085:

LT1085 Block Diagram
LT1085 Features
Three-Terminal 3.3V, 3.6V, 5V and 12V
Output Current of 3A, 5A or 7.5A
Operates Down to 1V Dropout
Guaranteed Dropout Voltage at Multiple Current Levels
Line Regulation: 0.015%
Load Regulation: 0.1%
100% Thermal Limit Functional Test
Adjustable Versions Available
LT1085 Applications
High-Efficiency Linear Regulators
Post Regulators for Switching Supplies
Constant Current Regulators
Battery Chargers
LT1085 Replacements
AZ1084, LT1084, NX1117
How to Use LT1085 Regulator
The LT1085 voltage regulator is simple to use because it only requires a few external components. The pin configuration of LT1085 is identical to that of AZ1084. This LT1085 is in adjustable mode, as shown in the image below, and you can alter the regulated output voltage by changing the value of the resistor connected to the ADJ pin.

LT1085 Application Circuit
Parts with Similar Specs
- ImagePart NumberManufacturerPackage / CaseNumber of PinsNumber of OutputsMin Input VoltageMax Input VoltageMin Output VoltageMax Output VoltageDropout VoltageView Compare
LT1085IT
T
3
1
2.55 V
30 V
1.25 V
28.5 V
1.3 V
TO-220-3
3
1
2.55 V
25 V
-
-
1.3 V
TO-220-3 Formed Leads
3
-
2.55 V
-
1.25 V
23.5 V
1.3 V
T
3
1
2.55 V
25 V
-
-
1.3 V
LT1085 Package Outline

LT1085 Package Outline
LT1085 Manufacturer
Analog Devices is an international market leader in the design, production, and commercialization of a large range of high-performance integrated circuits (ICs) for analog, mixed-signal, and digital signals (DSP) processing of almost all electronic systems. Since we started in 1965, the focus has been on the engineering challenge in electronic equipment related to signal to process. Our signal processing solutions, utilized by over 100,000 customers worldwide, play a key role in the conversion, conditioning, and processing of real-world events such as temperature, pressure, sonority, illumination, speed, and movement to electric signals for a wide range of electronic devices.
Similar parts from Analog Devices are as follows: lt1086ct#pbf, ltc2943idd#pbf, lt1761es5-2.5#trmpbf, lt3083eq#pbf, lt3010ems8e#pbf, etcs.
Datasheet PDF
- Datasheets :
- TechnicalDrawing :
- ConflictMineralStatement :
What is the use of LT1085?
LT1085 is a positive adjustable Low Dropout Linear voltage regulator designed to provide an output current of 3A with higher efficiency than currently available devices. The input voltage range is from 2.55V to 30V and is available in adjustable output voltage versions.
Are LT1117 and LT1085 regulators
LT1117 and LT1085 are low-dropout three-terminal regulators with similar functions to 78 series three-terminal regulators.
What is identical to the pin configuration of LT1085?
AZ1084
Why is the LT1085 voltage regulator simple to use?
Because of a few external components
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