Overview
The LP38690SD-5.0/NOPB is a 1-A low-dropout CMOS linear regulator produced by Texas Instruments. This device is part of the LP38690 series, known for its tight output tolerance, extremely low dropout voltage, and excellent AC performance. It is designed to meet the requirements of portable, battery-powered digital systems, providing an accurate output voltage with fast start-up. The regulator is available in various packages, including TO-252, SOT-223, and WSON, each offering low thermal resistance to handle full operating current even in high ambient temperature environments.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 2.7 to 10 | V |
| Output Voltage | 5.0 (fixed for LP38690SD-5.0/NOPB) | V |
| Output Current | 1 | A |
| Output Accuracy (25°C) | 2.5% | - |
| Dropout Voltage (typical at 1 A, VOUT = 5 V) | 450 mV | mV |
| Off-State Quiescent Current | 1 µA | µA |
| Ground Pin Current (typical at full load) | 55 µA | µA |
| Operating Temperature Range | -40°C to 125°C | °C |
| Package Types | TO-252, SOT-223, WSON | - |
Key Features
- Wide input voltage range (2.7 V to 10 V)
- 2.5% output accuracy at 25°C
- Low dropout voltage: 450 mV at 1 A (typical, VOUT = 5 V)
- Precision (trimmed) bandgap reference
- Ensured specifications for –40°C to 125°C
- 1-µA off-state quiescent current
- Thermal overload protection and foldback current limiting
- Enable pin (for LP38692 models)
- Low ground pin current: 55 µA (typical) at full load
- Stable with ceramic output capacitors
Applications
- Hard Disk Drives
- Notebook Computers
- Battery-Powered Devices
- Portable Instrumentation
Q & A
- What is the input voltage range of the LP38690SD-5.0/NOPB?
The input voltage range is from 2.7 V to 10 V.
- What is the fixed output voltage for the LP38690SD-5.0/NOPB?
The fixed output voltage is 5.0 V.
- What is the maximum output current of the LP38690SD-5.0/NOPB?
The maximum output current is 1 A.
- What is the typical dropout voltage at 1 A load current for the LP38690SD-5.0/NOPB?
The typical dropout voltage is 450 mV at 1 A load current (VOUT = 5 V).
- Does the LP38690SD-5.0/NOPB have thermal protection?
- What types of packages are available for the LP38690SD-5.0/NOPB?
The device is available in TO-252, SOT-223, and WSON packages.
- What is the ground pin current at full load for the LP38690SD-5.0/NOPB?
The ground pin current is typically 55 µA at full load.
- Is the LP38690SD-5.0/NOPB stable with ceramic output capacitors?
- What is the operating temperature range for the LP38690SD-5.0/NOPB?
The operating temperature range is from –40°C to 125°C.
- Does the LP38690SD-5.0/NOPB have an enable pin?
No, the LP38690 models do not have an enable pin; this feature is available in the LP38692 models.
