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LD39100PURY

LD39100PURY

STMicroelectronics
Linear Voltage Regulator IC Positive Adjustable 1 Output 1A 6-DFN (3x3)
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Overview

The LD39100PURY is a high-performance linear voltage regulator from STMicroelectronics designed to deliver 1A of output current in a compact 3x3 mm DFN6 package. It features an adjustable output starting from 0.8V and maintains high stability with ceramic capacitors, making it ideal for low-voltage digital rails. This specific variant is AEC-Q100 qualified, ensuring reliability in demanding automotive and industrial environments.

Why Choose This Part

The regulator offers an ultra-low dropout voltage of 200mV at 1A load, which minimizes power dissipation and allows for operation with very low head-room. It includes integrated protection features such as thermal shutdown and current limiting, alongside a dedicated Power Good pin for simplified power sequencing. Its ability to provide low-noise performance without an external bypass capacitor reduces the overall PCB footprint and bill of materials.

Applications

Automotive Electronic Control Units (ECUs)
Providing stable power to microprocessors and sensors in vehicle systems where AEC-Q100 qualification is mandatory.
High-Current FPGA/DSP Rails
Utilizing the 1A output and 0.8V minimum voltage to power modern low-voltage core logic.
Post-Regulator for Switching Supplies
Leveraging high PSRR (70dB at 1kHz) to clean up ripple from DC-DC converters in sensitive analog circuits.
Battery-Powered Industrial Devices
Taking advantage of the 20uA quiescent current and 1uA shutdown current to extend battery life.

Key Specifications

PSRR 70dB ~ 65dB (1kHz ~ 10kHz)
Output Type Adjustable
Mounting Type Surface Mount
Package / Case 6-VDFN Exposed Pad
Control Features Enable, Power Good
Current - Output 1A
Protection Features Over Current, Over Temperature, Short Circuit
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC
Voltage - Input (Max) 5.5V
Voltage Dropout (Max) 0.4V @ 1A
Current - Supply (Max) 300 uA
Voltage - Output (Max) 4.6V
Supplier Device Package 6-DFN (3x3)
Current - Quiescent (Iq) 50 uA
Voltage - Output (Min/Fixed) 0.8V

Getting Started

When designing with the LD39100PURY, place a 1uF ceramic capacitor close to the input and output pins for stability. Use the Power Good (PG) pin to signal downstream logic that the voltage has reached 92 percent of its target. For thermal management, ensure the DFN6 exposed pad is soldered to a large copper ground plane to dissipate heat generated during high-current operation.

Categories

Power Management > LDO Voltage Regulators Microcontrollers > STMicroelectronics