Overview
The LM285D-2.5, produced by Texas Instruments, is a micropower, two-terminal band-gap voltage reference diode. This device is part of the LMx85-2.5 series and is designed to operate over a wide current range of 20 μA to 20 mA. It features exceptionally low dynamic impedance, low noise, and stable operation over time and temperature. The LM285D-2.5 is particularly useful in micropower circuitry, such as portable instrumentation, regulators, and other analog circuitry where extended battery life is crucial.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Reference Voltage (VZ) | 2.462 | 2.5 | 2.538 | V |
| Average Temperature Coefficient of Reference Voltage | 20 | ppm/°C | ||
| Operating Current Range | 20 μA | 20 mA | ||
| Reverse Current (IR) | 30 mA | |||
| Forward Current (IF) | 10 mA | |||
| Junction Temperature (TJ) | 150 °C | |||
| Storage Temperature Range | -65 °C | 150 °C | ||
| Operating Ambient Temperature Range | -40 °C | 85 °C |
Key Features
- Operating current range of 20 μA to 20 mA
- 1.5% and 3% initial voltage tolerance
- Very low power consumption
- Exceptionally low dynamic impedance
- Good temperature stability and low noise
- On-chip trimming for tight voltage tolerance
- Capable of handling capacitive loading
- Available in various packages including SOIC, TO-92, and TSSOP
Applications
- Portable meter references
- Portable test instruments
- Battery-operated systems
- Current-loop instrumentation
- Panel meters
- Thermocouple cold-junction compensators
- Generating reference voltage with a constant current source
Q & A
- What is the reference voltage of the LM285D-2.5? The reference voltage is 2.5 V, with a tolerance range of 2.462 V to 2.538 V.
- What is the operating current range of the LM285D-2.5? The operating current range is from 20 μA to 20 mA.
- What are the key features of the LM285D-2.5? Key features include low dynamic impedance, good temperature stability, low noise, and very low power consumption.
- What are the typical applications of the LM285D-2.5? Typical applications include portable meter references, portable test instruments, battery-operated systems, and current-loop instrumentation.
- What is the junction temperature limit for the LM285D-2.5? The junction temperature limit is 150 °C.
- What is the storage temperature range for the LM285D-2.5? The storage temperature range is from -65 °C to 150 °C.
- How does the LM285D-2.5 handle capacitive loading? The device is designed to be exceptionally tolerant of capacitive loading, making it easier to use in most reference applications.
- What are the available packages for the LM285D-2.5? The device is available in SOIC, TO-92, and TSSOP packages.
- What is the average temperature coefficient of the reference voltage? The average temperature coefficient of the reference voltage is 20 ppm/°C.
- How does the LM285D-2.5 contribute to extended battery life in devices? The extremely low power drain of the LM285D-2.5 makes it useful for micropower circuitry, contributing to extended battery life in portable devices.
