Overview
The LM385BLP-2.5, produced by Texas Instruments, is a micropower, two-terminal, band-gap voltage reference. This device operates over a wide current range of 20 μA to 20 mA and is designed to provide a stable 2.5 V reference voltage. It features exceptionally low dynamic impedance and good temperature stability, making it suitable for various applications requiring precise voltage references.
The LM385BLP-2.5 is part of the LMx85-2.5 series, which includes devices with different package options. The LM385BLP-2.5 specifically comes in a TO-92 (3-pin) package, making it compact and suitable for space-constrained designs. The device's low power consumption and high stability make it ideal for battery-operated systems and other micropower circuitry.
Key Specifications
| Parameter | Min | |||
|---|---|---|---|---|
| Reference Voltage (VZ) | 2.462 | 2.5 | 2.538 | V |
| Average Temperature Coefficient of Reference Voltage (αVZ) | ±20 | ppm/°C | ||
| Minimum Reference Current (IZ(MIN)) | 8 | 20 | μA | |
| Reference Impedance (zz) | 0.4 | 1 | 1.5 | Ω |
| Broadband Noise Voltage (Vn) | 120 | μV | ||
| Operating Free-Air Temperature (TA) | 0 | 70 | °C | |
| Junction Temperature (TJ) | 150 | °C | ||
| Storage Temperature (Tstg) | -65 | 150 | °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 and good temperature stability
- On-chip trimming for tight voltage tolerance
- Low noise and long-term stability
- Tolerant of capacitive loading, making it easier to use in most reference applications
- Wide dynamic operating temperature range
- Internal frequency compensation for stable loop operation with all capacitive loads
- Floating shunt design useful for both positive and negative regulation applications
Applications
- Portable meter references
- Portable test instruments
- Battery-operated systems
- Current-loop instrumentation
- Panel meters
- Amplifiers, power supplies, and current-sensing circuits
- Thermocouple cold-junction compensators
Q & A
- What is the reference voltage of the LM385BLP-2.5?
The reference voltage of the LM385BLP-2.5 is 2.5 V, with a tolerance range of 2.462 V to 2.538 V.
- What is the operating current range of the LM385BLP-2.5?
The operating current range is from 20 μA to 20 mA.
- What are the key features of the LM385BLP-2.5?
The device features low dynamic impedance, good temperature stability, low noise, and long-term stability. It also has on-chip trimming for tight voltage tolerance and is tolerant of capacitive loading.
- What are the typical applications of the LM385BLP-2.5?
Typical applications include portable meter references, portable test instruments, battery-operated systems, current-loop instrumentation, and panel meters.
- What is the package type of the LM385BLP-2.5?
The LM385BLP-2.5 comes in a TO-92 (3-pin) package.
- What is the maximum junction temperature for the LM385BLP-2.5?
The maximum junction temperature is 150°C.
- How does the LM385BLP-2.5 handle capacitive loading?
The device is exceptionally tolerant of capacitive loading, making it easier to use in most reference applications.
- What is the recommended minimum cathode current for proper regulation?
The minimum cathode current (IZ(MIN)) is 8 μA.
- Can the LM385BLP-2.5 be used in thermocouple cold-junction compensation?
- How should the supply voltage be managed for the LM385BLP-2.5?
The supply voltage should be current limited to ensure that the maximum cathode current is not exceeded.
