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LDQ40PU33R

LDQ40PU33R

STMicroelectronics
Linear Voltage Regulator IC Positive Fixed 1 Output 250mA 6-DFN (2x2)
Active1,144 in stock
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Overview

The LDQ40PU33R is a high-voltage, ultra-low quiescent current linear regulator designed for reliable power delivery in demanding environments. It supports an input voltage up to 40V and provides a fixed 3.3V output at 250mA, making it ideal for direct connection to battery rails in industrial and automotive systems.

Why Choose This Part

The device features an exceptionally low quiescent current of 2uA and a shutdown current of 0.3uA, significantly extending battery life in standby modes. Its AEC-Q100 Grade 1 qualification and wide operating temperature range up to 150 degrees Celsius ensure survival in harsh thermal environments.

Applications

Automotive Body Electronics
Powering always-on modules like keyless entry receivers or alarm systems where low standby current is critical.
Industrial Sensors
Providing a stable 3.3V rail for sensors and transmitters operating from 24V industrial power loops.
Battery-Powered Tools
Regulating power from high-voltage multi-cell lithium-ion packs for internal control logic.

Key Specifications

PSRR 55dB (1kHz)
Output Type Fixed
Mounting Type Surface Mount
Package / Case 6-WDFN Exposed Pad
Control Features Current Limit, Enable
Current - Output 250mA
Protection Features Over Current, Over Temperature, Short Circuit
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 150degC (TJ)
Voltage - Input (Max) 40V
Voltage Dropout (Max) 1V @ 250mA
Current - Supply (Max) 500 uA
Supplier Device Package 6-DFN (2x2)
Current - Quiescent (Iq) 5 uA
Voltage - Output (Min/Fixed) 3.3V

Getting Started

When designing the PCB, place a low-ESR ceramic capacitor of at least 1uF close to the output pin to ensure stability. Utilize the Power Good (PG) pin to monitor the regulation status and the Enable (EN) pin for logic-controlled power sequencing.