Overview
The LM385Z-2.5/LFT1 is a micropower voltage reference produced by Texas Instruments. This 2-terminal band-gap voltage regulator is designed to provide a stable 2.5V reference voltage with minimal power consumption, making it ideal for use in a wide range of applications, including portable meters, regulators, and general-purpose analog circuitry. The device is known for its low operating current, high accuracy, and robust temperature stability.
Key Specifications
| Parameter | Conditions | Typical Value | Minimum Value | Maximum Value |
|---|---|---|---|---|
| Reverse Breakdown Voltage | IR = 100 μA | 2.5 V | 2.480 V | 2.520 V |
| Minimum Operating Current | 20 μA | |||
| Reverse Dynamic Impedance | IR = 100 μA, f = 20 Hz | 0.6 Ω | ||
| Wideband Noise (rms) | IR = 100 μA, 10 Hz ≤ f ≤ 10 kHz | 120 μV | ||
| Long Term Stability | IR = 100 μA, T = 1000 Hr, TA = 25°C ±0.1°C | 20 ppm | ||
| Average Temperature Coefficient | IMIN ≤ IR ≤ 20 mA | 30 ppm/°C (X Suffix), 50 ppm/°C (Y Suffix), 150 ppm/°C (All Others) | ||
| Operating Temperature Range | 0°C | 70°C |
Key Features
- Low Power Consumption: The LM385Z-2.5/LFT1 operates with a minimum current of 20 μA, making it suitable for micropower applications.
- High Accuracy: The device offers a high degree of accuracy with an initial tolerance of ±20 mV (±0.8%) and a reverse breakdown voltage of 2.5V.
- Robust Temperature Stability: It has a low average temperature coefficient, ensuring stable performance over a wide temperature range (0°C to 70°C).
- Low Dynamic Impedance: The device features a low dynamic impedance of 0.6 Ω, which helps in maintaining stability under varying load conditions.
- Wide Operating Current Range: The LM385Z-2.5/LFT1 can operate with currents ranging from 20 μA to 20 mA.
- Multiple Package Options: Available in TO-92, SOIC, and SOT-23 packages, providing flexibility in design and application.
Applications
- Portable Meters and Instruments: Ideal for battery-powered devices due to its low power consumption.
- Voltage Regulators: Can be used as a reference voltage in voltage regulator circuits.
- General-Purpose Analog Circuitry: Suitable for a variety of analog circuits requiring a stable reference voltage.
- Industrial and Automotive Systems: Its robust temperature stability makes it suitable for use in harsh environmental conditions.
Q & A
- What is the typical output voltage of the LM385Z-2.5/LFT1?
The typical output voltage is 2.5V.
- What is the minimum operating current for the LM385Z-2.5/LFT1?
The minimum operating current is 20 μA.
- What is the operating temperature range for the LM385Z-2.5/LFT1?
The operating temperature range is from 0°C to 70°C.
- What are the available package options for the LM385Z-2.5/LFT1?
The device is available in TO-92, SOIC, and SOT-23 packages.
- How does the LM385Z-2.5/LFT1 handle capacitive loading?
The device is exceptionally tolerant of capacitive loading, making it easy to use in almost any reference application.
- What is the dynamic impedance of the LM385Z-2.5/LFT1?
The dynamic impedance is 0.6 Ω at IR = 100 μA and f = 20 Hz.
- What is the long-term stability of the LM385Z-2.5/LFT1?
The long-term stability is 20 ppm over 1000 hours at TA = 25°C ±0.1°C.
- How does the LM385Z-2.5/LFT1 perform in terms of noise?
The device has a wideband noise of 120 μV (rms) over the frequency range of 10 Hz to 10 kHz.
- What are the ESD protection measures for the LM385Z-2.5/LFT1?
The device has limited built-in ESD protection; it is recommended to short the leads together or place the device in conductive foam during storage or handling.
- Can the LM385Z-2.5/LFT1 be used in harsh environmental conditions?
Yes, the device is suitable for use in harsh environmental conditions due to its robust temperature stability and wide operating current range.
