Overview
The LP38691DT-3.3/NOPB is a 500-mA low-dropout CMOS linear regulator produced by Texas Instruments. This device is designed to meet the requirements of portable, battery-powered digital systems, providing an accurate output voltage with fast start-up. It is available in a TO-252 package and operates within a wide input voltage range of 2.7 V to 10 V, making it suitable for various applications including hard disk drives, notebook computers, battery-powered devices, and portable instrumentation.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 2.7 V to 10 V | V |
| Output Voltage | 3.3 V | V |
| Output Current | 500 mA | A |
| Low Dropout Voltage | 250 mV at 500 mA (Typical) | mV |
| Quiescent Current | 55 µA (Typical) | µA |
| Thermal Shutdown Activation | 160°C (Junction Temperature) | °C |
| Foldback Current Limit | 350 mA (Typical when VIN - VOUT > 5 V) | mA |
| Ripple Rejection | 55 dB at 120 Hz | dB |
| Operating Temperature Range | -40°C to 125°C | °C |
| Package Type | TO-252 (NDP) |
Key Features
- Precision Bandgap Reference: Ensures accurate output voltage.
- Low Dropout Voltage: 250 mV at 500 mA, allowing for efficient operation.
- Thermal Overload Protection: Disables the output when the junction temperature exceeds 160°C to prevent overheating.
- Foldback Current Limiting: Reduces output current as the output voltage is reduced, protecting against overcurrent conditions.
- Enable Pin (LP38693 only): Allows external control to turn the regulator output On and Off.
- Low Quiescent Current: 55 µA (typical) at full load, minimizing power consumption.
- Stable with Ceramic Output Capacitors: Operates reliably with a single 1-μF ceramic output capacitor.
Applications
- Hard Disk Drives: Provides stable power for disk drive operations.
- Notebook Computers: Suitable for powering various components in portable computing devices.
- Battery-Powered Devices: Ideal for devices requiring low power consumption and high efficiency.
- Portable Instrumentation: Used in handheld and portable measurement instruments.
Q & A
- What is the input voltage range of the LP38691DT-3.3/NOPB? The input voltage range is from 2.7 V to 10 V.
- What is the typical output voltage of the LP38691DT-3.3/NOPB? The typical output voltage is 3.3 V.
- What is the maximum output current of the LP38691DT-3.3/NOPB? The maximum output current is 500 mA.
- What is the low dropout voltage of the LP38691DT-3.3/NOPB? The low dropout voltage is 250 mV at 500 mA (typical).
- Does the LP38691DT-3.3/NOPB have thermal protection? Yes, it has thermal overload protection that disables the output when the junction temperature exceeds 160°C.
- What is the quiescent current of the LP38691DT-3.3/NOPB? The quiescent current is 55 µA (typical) at full load.
- Can the LP38691DT-3.3/NOPB be used with ceramic output capacitors? Yes, it is stable with a single 1-μF ceramic output capacitor.
- What is the operating temperature range of the LP38691DT-3.3/NOPB? The operating temperature range is from -40°C to 125°C.
- What package type is the LP38691DT-3.3/NOPB available in? It is available in a TO-252 (NDP) package.
- Does the LP38691DT-3.3/NOPB have an enable pin? The LP38693 version has an enable pin, but the LP38691 does not.
