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LD1085V

LD1085V

STMicroelectronics
Linear Voltage Regulator IC Positive Adjustable 1 Output 3A TO-220
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Overview

The LD1085V is a high-current low-dropout linear regulator capable of providing up to 3A of output current. It features an adjustable output voltage range starting from 1.25V up to 28.5V, making it a versatile choice for high-power analog and digital rails. With a maximum dropout voltage of 1.5V at full load, it maintains efficiency in applications where the input-to-output differential is tight.

Why Choose This Part

The LD1085V offers a significant current capability of 3A in a standard TO-220 package, which is triple the capacity of standard 1117-series regulators. It provides excellent ripple rejection of 72dB at 120Hz, ensuring stable power delivery for sensitive electronics even under heavy load conditions.

Applications

High-Efficiency Linear Post-Regulators
Used after a switching regulator to provide a clean, low-noise supply for high-current digital circuits without the bulk of traditional linear regulators.
Battery Powered Systems
The low dropout voltage allows for extended operation as the battery voltage drops toward the desired output rail.
Constant Current Sources
The 1.25V internal reference allows the device to be easily configured as a high-current precision constant current limiter.
Microprocessor Core Supplies
Provides the high current and fast transient response required by modern high-performance microcontrollers and FPGAs.

Key Specifications

PSRR 72dB (120Hz)
Output Type Adjustable
Mounting Type Through Hole
Package / Case TO-220-3
Current - Output 3A
Protection Features Over Current, Over Temperature
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC
Voltage - Input (Max) 30V
Voltage Dropout (Max) 1.5V @ 3A
Voltage - Output (Max) 28.5V
Supplier Device Package TO-220
Current - Quiescent (Iq) 10 mA
Voltage - Output (Min/Fixed) 1.25V

Getting Started

When designing with the LD1085V, ensure a minimum of 10uF capacitance is placed on the output to maintain stability. The TO-220 package requires adequate heat sinking when dissipating significant power, calculated by the voltage drop multiplied by the load current. Refer to the datasheet to select the appropriate resistor divider for your target output voltage using the 1.25V reference pin.

Also Consider

LM350T TITexas Instruments - An industry-standard 3A adjustable regulator that serves as a direct functional alternative in TO-220 packaging.

Categories

Power Management > LDO Voltage Regulators