Overview
The LP38692MP-ADJ is a 1-A low dropout CMOS linear regulator produced by Texas Instruments. This regulator is part of the LP38690/2-ADJ series, known for its high precision and excellent AC performance. It provides a 2.5% precision reference voltage and features an extremely low dropout voltage of 450 mV at a 1-A load current. The regulator is designed to work with ultralow equivalent series resistance (ESR) ceramic output capacitors, ensuring stable operation and high-frequency noise bypassing capabilities.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Output Current | 1 | A |
| Dropout Voltage | 450 mV (typical at 1 A, VIN = 5 V) | mV |
| Output Voltage Accuracy | 2.5% | % |
| Adjustable Output Voltage Range | 1.25 to 9 V | V |
| Enable Pin (LP38692-ADJ only) | Yes | |
| Package Type | SOT-223-5 | |
| Minimum Load Current | 100 µA | µA |
| Input Capacitor Requirement | At least 1 µF (ceramic recommended) | µF |
| Output Capacitor Requirement | At least 1 µF (ceramic recommended) | µF |
| Junction-to-Ambient Thermal Resistance (θJ-A) | Approximately 125 ˚C/W (SOT-223 with minimal copper area) | ˚C/W |
Key Features
- Low Dropout Voltage: 450 mV at 1-A load current, ensuring minimal voltage loss.
- High Precision Reference Voltage: 2.5% accuracy.
- Adjustable Output Voltage: Output voltage can be adjusted from 1.25 V to 9 V using external resistors.
- Enable Pin: The LP38692-ADJ model includes an enable pin to turn the regulator on and off.
- Stability with Low ESR Capacitors: Designed to work with ultralow ESR ceramic capacitors for stable operation.
- Foldback Current Limiting: Reduces output current as the output voltage is reduced, protecting the device from overcurrent conditions.
- RFI/EMI Susceptibility Mitigation: Recommendations for using good ceramic bypass capacitors and proper PCB layout to minimize RFI/EMI effects.
Applications
The LP38692MP-ADJ is suitable for a variety of applications requiring stable and efficient voltage regulation. These include:
- Power Supply Systems: For providing regulated voltage in power supply units.
- Embedded Systems: In microcontroller and microprocessor-based systems requiring stable voltage supply.
- Automotive Electronics: For use in automotive systems where low dropout voltage and high precision are crucial.
- Industrial Control Systems: In industrial automation and control systems that require reliable voltage regulation.
- Telecommunication Equipment: For use in telecommunication devices and networks where stable power supply is essential.
Q & A
- What is the maximum output current of the LP38692MP-ADJ?
The maximum output current is 1 A. - What is the typical dropout voltage of the LP38692MP-ADJ at 1-A load current?
The typical dropout voltage is 450 mV at 1-A load current. - How is the output voltage adjusted in the LP38692MP-ADJ?
The output voltage is adjusted using external resistors R1 and R2 connected to the ADJ pin. - Does the LP38692MP-ADJ have an enable pin?
Yes, the LP38692-ADJ model includes an enable pin to turn the regulator on and off. - What type of capacitors are recommended for use with the LP38692MP-ADJ?
Ceramic capacitors with low ESR are recommended for both input and output capacitors. - What is the minimum load current requirement for the LP38692MP-ADJ?
The minimum load current requirement is 100 µA. - How does the foldback current limiting feature work in the LP38692MP-ADJ?
The foldback current limiting reduces the output current as the output voltage is reduced, typically limiting the load current to about 450 mA when the differential voltage between VIN and VOUT exceeds 5 V. - What are the thermal considerations for the LP38692MP-ADJ?
The junction-to-ambient thermal resistance (θJ-A) is approximately 125 ˚C/W for minimal copper area, and it can be improved by using a larger copper area for heat dissipation. - How can RFI/EMI susceptibility be mitigated in the LP38692MP-ADJ?
Using good ceramic bypass capacitors and following proper PCB layout practices can help mitigate RFI/EMI effects. - What are the package options for the LP38692MP-ADJ?
The LP38692MP-ADJ is available in the SOT-223-5 package.
