Overview
The LP311DR is a low-power differential comparator with strobe functionality, produced by Texas Instruments. It is a low-power version of the industry-standard LM311 device, designed to offer significant power savings while maintaining key performance characteristics. The LP311DR is well-suited for applications where power efficiency is crucial, such as battery-powered devices, and in scenarios where fast response times are not the primary requirement.
These comparators utilize stable, high-value, ion-implanted resistors to achieve a 30:1 reduction in power consumption compared to the LM311 series, with only a 6:1 slowdown in response time. They operate over a wide range of supply voltages, from ±18 V down to a single 3-V supply, and can drive loads up to 25 mA. The LP311DR is characterized for operation from 0°C to 70°C, making it versatile for various environmental conditions.
Key Specifications
| Parameter | Typical | Minimum | Maximum | Unit |
|---|---|---|---|---|
| Supply Voltage | - | 3.5 | 30 | V |
| Input Offset Voltage | 2 | - | 7.5 | mV |
| Input Offset Current | 2 | - | 25 | nA |
| Input Bias Current | 15 | - | 100 | nA |
| Output Drive Capability | - | - | 25 | mA |
| Response Time | 1.2 | - | - | μs |
| Common-Mode Input Range | - | -14.5 | 13.5 | V |
| Operating Temperature Range | - | 0 | 70 | °C |
| Power Consumption (at 5V Supply) | 900 | - | - | μW |
Key Features
- Low Power Consumption: Typical power drain of 900 μW with a 5-V supply, making it suitable for battery-powered applications.
- Wide Supply Voltage Range: Operates from ±15 V or from a single supply as low as 3 V.
- High Output Drive Capability: Can drive loads up to 25 mA.
- Emitter Output Swing: Emitter output can swing below the negative supply voltage.
- Fast Response Time: Typical response time of 1.2 μs.
- Low Input Currents: Low input offset current (2 nA typical) and bias current (15 nA typical).
- Wide Common-Mode Input Range: From −14.5 V to 13.5 V using ±15-V supply.
- Offset Balancing and Strobe Capability: Features for minimizing input offset voltage and turning off the output regardless of inputs.
- Interchangeability: Same pinout as LM211 and LM311, making it interchangeable with industry-standard devices.
Applications
- Battery-Powered Devices: Ideal for applications where power efficiency is critical.
- Industrial Control Systems: Suitable for various industrial control applications where reliable and efficient comparators are needed.
- Medical Devices: Can be used in medical equipment where low power consumption and reliability are essential.
- Automotive Systems: Applicable in automotive electronics where robust and efficient components are required.
- Consumer Electronics: Useful in consumer electronics such as audio equipment, sensors, and other devices requiring low-power comparators.
Q & A
- What is the typical power consumption of the LP311DR?
The typical power consumption of the LP311DR is 900 μW with a 5-V supply.
- What is the operating temperature range of the LP311DR?
The LP311DR operates from 0°C to 70°C.
- What is the maximum output drive capability of the LP311DR?
The LP311DR can drive loads up to 25 mA.
- Can the LP311DR operate with a single supply voltage?
- What is the response time of the LP311DR?
The typical response time of the LP311DR is 1.2 μs.
- Does the LP311DR have offset balancing and strobe capability?
- Is the LP311DR interchangeable with other industry-standard comparators?
- What is the common-mode input range of the LP311DR?
The common-mode input range of the LP311DR is from −14.5 V to 13.5 V using ±15-V supply.
- How do I minimize input offset voltage in the LP311DR?
You can minimize input offset voltage by using the offset balancing feature.
- How do I turn off the output of the LP311DR regardless of the inputs?
You can turn off the output by pulling the strobe pin low.
