Overview
The LM2931CDR2, produced by onsemi, is a part of the LM2931 series of positive fixed and adjustable output low dropout (LDO) linear voltage regulators. These regulators are designed to maintain proper regulation with an extremely low input-to-output voltage differential. They are capable of supplying output currents in excess of 100 mA and feature a low bias current of 0.4 mA at 10 mA output. The LM2931 series is primarily designed to survive in harsh automotive environments, protecting external load circuitry from input fault conditions such as reverse battery connections, two battery jump starts, and excessive line transients during load dump. The regulators also include internal current limiting, thermal shutdown, and temporary power-up protection with mirror-image insertion.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Current | Up to 100 mA | mA |
| Dropout Voltage | 90 mV (typ. at 10 mA load) | mV |
| Quiescent Current | 2.5 mA (typ. at 100 mA load) | mA |
| Load Dump Protection | Up to 60 V | V |
| Reverse Transient Protection | Up to -50 V | V |
| Operating Temperature Range | -40 to 125 °C | °C |
| Package Options | TO-92, DPAK, SO-8 | |
| Internal Current Limiting | Internally limited | |
| Thermal Shutdown | Yes |
Key Features
- Very low dropout voltage (90 mV typ. at 10 mA load)
- Low quiescent current (typ. 2.5 mA at 100 mA load)
- Internal current limiting and thermal shutdown
- Load dump protection up to 60 V and reverse transient protection up to -50 V
- Temporary power-up protection with mirror-image insertion
- Output inhibit pin available in SO-8 package for microprocessor-based systems
- High accuracy (+/-2%) reference available (LM2931AC)
- Economical 5-lead TO-220 package with two optional leadforms and surface mount SOP-8, DPAK, and DPAK packages
Applications
- Battery-powered consumer products
- Handheld instruments
- Automotive applications
- Battery-powered industrial equipment
- Low noise, low power applications
Q & A
- What is the maximum output current of the LM2931CDR2?
The LM2931CDR2 can supply output currents in excess of 100 mA.
- What is the typical dropout voltage of the LM2931CDR2?
The typical dropout voltage is 90 mV at a 10 mA load.
- What kind of protection does the LM2931CDR2 offer against input faults?
The LM2931CDR2 offers protection against reverse battery connections, two battery jump starts, and excessive line transients during load dump.
- What are the operating temperature ranges for the LM2931CDR2?
The operating temperature range is -40 to 125 °C.
- Does the LM2931CDR2 have internal current limiting and thermal shutdown features?
- What packages are available for the LM2931CDR2?
The LM2931CDR2 is available in TO-92, DPAK, and SO-8 packages.
- Is the LM2931CDR2 suitable for battery-powered equipment?
- Does the LM2931CDR2 have an output inhibit feature?
- What is the maximum load dump protection voltage for the LM2931CDR2?
The LM2931CDR2 offers load dump protection up to 60 V.
- What is the reverse transient protection voltage for the LM2931CDR2?
The LM2931CDR2 offers reverse transient protection up to -50 V.
