Overview
The L4938ED is a monolithic integrated dual voltage regulator produced by STMicroelectronics. It is designed with two very low dropout outputs and includes additional functions such as power-on reset and input voltage sense. This regulator is particularly suited for supplying microcomputer-controlled systems, especially in automotive applications. The L4938ED offers high precision and reliability, making it a robust choice for demanding environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating DC Supply Voltage Range | 5 - 28 | V |
| Operating Transient Supply Voltage | Up to 40 | V |
| Output 1 Voltage | 5 ± 1% | V |
| Output 1 Current Capability | 100 mA | mA |
| Output 2 Voltage (Fixed) | 5 ± 2% | V |
| Output 2 Current Capability | 400 mA | mA |
| Quiescent Current | 65 µA (less than 90 µA in standby) | µA |
| Enable Input Low Voltage | -20 to 1 | V |
| Enable Input High Voltage | 1.4 to 20 | V |
| Reset Threshold Adjustable Range | 3.8 to 4.7 | V |
| Operating Junction Temperature | -40 to 150 | °C |
| Storage Temperature | -65 to 150 | °C |
| Package Type | 20-SOIC (0.295, 7.50mm Width) |
Key Features
- Enable and sense inputs (EN, SI) protected against negative transients down to -5 V.
- Reset threshold adjustable from 3.8 V to 4.7 V.
- Extremely low quiescent current, 65 µA (less than 90 µA) in standby mode.
- High precision standby output voltage 5 V ± 1% with 100 mA current capability.
- Output 2 voltage 5 V ± 2% with 400 mA current capability (ADJ wired to VOUT2).
- Output 2 voltage adjustable by external voltage divider.
- Output 2 disable function for standby mode.
- ESD protection according to MIL-STD-883C.
- Thermal shutdown protection.
Applications
The L4938ED is primarily designed for use in microcomputer-controlled systems, particularly in automotive applications. Its features make it suitable for a variety of uses where high precision, low dropout voltage, and robust protection mechanisms are required.
Q & A
- What is the operating DC supply voltage range of the L4938ED?
The operating DC supply voltage range is 5 V to 28 V. - What is the maximum transient supply voltage the L4938ED can handle?
The L4938ED can handle transient supply voltages up to 40 V. - What are the output voltages and current capabilities of the L4938ED?
Output 1: 5 V ± 1% with 100 mA current capability. Output 2: 5 V ± 2% with 400 mA current capability. - What is the quiescent current of the L4938ED?
The quiescent current is 65 µA (less than 90 µA in standby mode). - How is the reset threshold adjustable on the L4938ED?
The reset threshold is adjustable from 3.8 V to 4.7 V. - What kind of protection does the L4938ED offer against negative transients?
The enable and sense inputs (EN, SI) are protected against negative transients down to -5 V. - What is the operating junction temperature range of the L4938ED?
The operating junction temperature range is -40°C to 150°C. - What package type is the L4938ED available in?
The L4938ED is available in a 20-SOIC (0.295, 7.50mm Width) package. - Does the L4938ED have thermal shutdown protection?
Yes, the L4938ED has thermal shutdown protection. - Is the L4938ED RoHS compliant?
Yes, the L4938ED is RoHS compliant.
