L4938ED

$1.84

Description：IC REG LINEAR POS ADJ 20SO
Series：-
Mfr：STMicroelectronics
Package：Tube

SKU:7716d800714f Category: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Brand: STMicroelectronics

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Product introduction

L4938ED is listed in the Voltage Regulators - Linear, Low Drop Out (LDO) Regulators range at ChipApex. The manufacturer field lists STMicroelectronics. Its product description is IC REG LINEAR POS ADJ 20SO. Review the specifications below when checking this part for your BOM.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators specifications for L4938ED

Description：IC REG LINEAR POS ADJ 20SO
Series：-
Mfr：STMicroelectronics
Package：Tube
Output Configuration：Positive
Output Type：Adjustable (Fixed)
Number of Regulators：2
Voltage - Input (Max)：28V
Voltage - Output (Min/Fixed)：4.9V (5V)
Voltage - Output (Max)：5.1V
Voltage Dropout (Max)：0.4V @ 100mA, 0.6V @ 400mA
Current - Output：100mA, 400mA
Current - Quiescent (Iq)：-
Current - Supply (Max)：-
PSRR：-
Control Features：Enable, Reset
Protection Features：Over Temperature
Operating Temperature：-40°C ~ 150°C
Mounting Type：Surface Mount
Package / Case：20-SOIC (0.295", 7.50mm Width)
Supplier Device Package：20-SO
Grade：-
Qualification：-

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators datasheet and documents for L4938ED

L4938ED

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The L4938ED is a monolithic dual linear voltage regulator designed for microcomputer systems. It features two low-dropout outputs: Output 1 provides a fixed 5V at 100mA, while Output 2 offers 400mA with adjustable voltage via an external divider. The device includes power-on reset and input voltage sense functions. It operates within a DC supply range of 5V to 28V, with transient tolerance up to 40V. Key electrical parameters include a maximum dropout voltage of 0.4V at 100mA and 0.6V at 400mA. Quiescent current is extremely low at 65μA, rising to less than 90μA in standby mode.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

Dual output configuration with one fixed precision standby rail and one high-current adjustable main rail
Integrated power-on reset circuit with user-adjustable threshold levels
Input voltage sensing capability with protection against negative transients down to -5V
Ultra-low quiescent current consumption optimized for battery-powered applications

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

Powering microcomputer controlled systems in automotive environments
Standby voltage regulation for embedded controllers
Main logic supply generation for low-power digital circuits

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify component status as the L4938ED series is listed as obsolete and no longer manufactured. Confirm availability of qualified replacement parts such as the NCV47411PAAJR2G from onsemi if procurement is required. Ensure that any substitute components meet the original pinout and functional specifications for seamless integration into existing designs without hardware modification.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when designing systems requiring a dedicated stable standby voltage alongside a primary adjustable supply. The integrated reset function simplifies system initialization sequences. Consider the thermal performance given the package type and expected load currents. Verify that the input voltage range aligns with the system's power source characteristics, particularly regarding transient spikes common in automotive or industrial settings.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the L4938 family of advanced voltage regulators produced by STMicroelectronics. These devices are specifically engineered for reliability in harsh environments, including automotive applications. The family emphasizes low power consumption and high precision, making them suitable for battery-operated devices where efficiency and stability are critical for extended operational life.