Overview
The LP38693SDX-5.0/NOPB is a 500-mA low-dropout CMOS linear regulator produced by Texas Instruments. This device is part of the LP3869x family, known for its tight output tolerance, extremely low dropout voltage, and excellent AC performance. The LP38693SDX-5.0/NOPB is available in the WSON package and is designed to operate over a wide input voltage range from 2.7 V to 10 V, making it versatile for various applications.
The regulator features an enable pin, thermal overload protection, and foldback current limiting, ensuring reliable operation in diverse environments. It is stable with ceramic output capacitors and has a low quiescent current, making it suitable for battery-powered devices and other power-sensitive applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.7 | - | 10 | V |
| Output Voltage | - | 5.0 | - | V |
| Output Current | - | - | 500 | mA |
| Dropout Voltage (Typical, 5 V Out, 500 mA) | - | 250 | - | mV |
| Output Accuracy (25°C) | - | 2% | - | % |
| Quiescent Current (Full Load) | - | 55 | - | µA |
| Thermal Shutdown Activation | - | 160 | - | °C |
| Thermal Shutdown Hysteresis | - | 10 | - | °C |
| Foldback Current Limit | - | 350 | - | mA |
| Ripple Rejection (120 Hz, 1 V(p-p)) | - | 55 | - | dB |
Key Features
- Wide Input Voltage Range: Operates from 2.7 V to 10 V.
- Low Dropout Voltage: 250 mV at 500 mA (typical, 5 V out).
- Precision Output: 2% output accuracy at 25°C.
- Enable Pin: Allows external control to turn the regulator output on and off (LP38693 only).
- Thermal Overload Protection: Thermal shutdown at approximately 160°C.
- Foldback Current Limiting: Reduces output current as output voltage is reduced.
- Low Quiescent Current: 55 µA (typical) at full load.
- No-Load Stability: Remains stable and in regulation with no external load.
- Ceramic Capacitor Compatibility: Stable with ceramic output capacitors.
Applications
- Hard Disk Drives: Provides stable power supply for hard disk drive operations.
- Notebook Computers: Suitable for power management in portable computing devices.
- Battery-Powered Devices: Ideal for devices requiring low power consumption and high efficiency.
- Portable Instrumentation: Used in various portable measurement and diagnostic tools.
Q & A
- What is the input voltage range of the LP38693SDX-5.0/NOPB?
The input voltage range is from 2.7 V to 10 V.
- What is the typical dropout voltage of the LP38693SDX-5.0/NOPB at 500 mA load current?
The typical dropout voltage is 250 mV at 500 mA load current for a 5 V output.
- Does the LP38693SDX-5.0/NOPB have an enable pin?
- What is the thermal shutdown activation temperature for the LP38693SDX-5.0/NOPB?
The thermal shutdown activates at approximately 160°C.
- What type of capacitors is the LP38693SDX-5.0/NOPB stable with?
The device is stable with ceramic output capacitors.
- What is the quiescent current of the LP38693SDX-5.0/NOPB at full load?
The quiescent current is typically 55 µA at full load.
- Is the LP38693SDX-5.0/NOPB suitable for no-load conditions?
- What is the ripple rejection of the LP38693SDX-5.0/NOPB?
The ripple rejection is typically 55 dB at 120 Hz with a 1 V(p-p) ripple.
- What are some common applications of the LP38693SDX-5.0/NOPB?
- What is the foldback current limiting feature in the LP38693SDX-5.0/NOPB?
The foldback current limiting reduces the output current as the output voltage is reduced, typically limiting to about 350 mA when the VIN – VOUT differential exceeds 5 V.
