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LD2985BM33R is a fixed low noise voltage regulator, part of the LD2985 Series, delivering a constant 3.3V output with a maximum current of 150mA

Quantity Unit Price(USD) Ext. Price
1 $0.412 $0.41
10 $0.330 $3.30
30 $0.296 $8.88
100 $0.252 $25.20
500 $0.198 $99.00
1000 $0.188 $188.00


*The price is for reference only.
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Overview of LD2985BM33R

The LD2985BM33R is a 500mA low dropout voltage regulator IC designed for use in various electronic applications. It provides a stable output voltage with low dropout voltage and quiescent current, making it ideal for powering sensitive components.


(Note: The pin configuration below is a general representation. Refer to the specific datasheet for precise details.)

  • VOUT: Output Voltage
  • VIN: Input Voltage
  • GND: Ground
  • Enable: Enable Pin
  • NC: No Connection

Circuit Diagram

Include a circuit diagram illustrating the connections and operation of the LD2985BM33R IC for a visual representation.

Key Features

  • Low Dropout Voltage: Provides a stable output voltage even with small input-output voltage differentials.
  • Low Quiescent Current: Ensures minimal current consumption in standby or idle modes.
  • Thermal Shutdown Protection: Includes thermal shutdown protection to prevent damage due to overheating.
  • Short Circuit Protection: Offers short circuit protection for increased reliability.
  • Wide Operating Voltage Range: Operates within a wide input voltage range, making it versatile for different power supply scenarios.

Note: For detailed technical specifications, please refer to the LD2985BM33R datasheet.


  • Power Supply Regulation: Suitable for regulating power supplies in various electronic devices.
  • Battery-Powered Devices: Ideal for use in battery-powered devices requiring stable voltage regulation.
  • Embedded Systems: Commonly used in embedded systems for voltage regulation and component protection.


The LD2985BM33R is a low dropout voltage regulator that ensures a stable output voltage for sensitive components. It provides reliable voltage regulation with minimal power loss.

Usage Guide

  • Input Voltage: Connect VIN (Pin 2) to the input voltage source.
  • Output Voltage: Connect VOUT (Pin 1) to the component requiring regulated voltage.
  • Enable Pin: Use the Enable pin (Pin 4) to control the regulator's output.

Frequently Asked Questions

Q: What is the dropout voltage of the LD2985BM33R?
A: The LD2985BM33R has a low dropout voltage, typically around 300mV at 500mA load current.

Q: Is thermal shutdown necessary for the LD2985BM33R?
A: Thermal shutdown protection is essential for the LD2985BM33R to prevent overheating and ensure safe operation.


For similar functionalities, consider these alternatives to the LD2985BM33R:

  • LM2937: A low dropout voltage regulator from Texas Instruments with comparable features and performance.
  • ADP3338: This IC from Analog Devices offers similar voltage regulation capabilities with enhanced efficiency.


The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Operating Range Automotive Operating Temp Min Celsius -40.0
Operating Temp Max Celsius 125.0 ECCN US EAR99
ECCN EU NEC Packing Type Tape And Reel
RoHs compliant Ecopack2 Grade Industrial
Package Name SOT23-5L

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