Overview
The LM317MABDT, produced by Onsemi, is an adjustable three-terminal positive-voltage regulator. This device is capable of supplying in excess of 500 mA over an output voltage range of 1.2 V to 37 V. It is designed for ease of use, requiring only two external resistors to set the output voltage. The LM317MABDT is packaged in a DPAK (TO-252) package, making it suitable for surface mount applications. It features internal current limiting, thermal shutdown, and safe area compensation, ensuring robust protection against overload and excessive heat.
Key Specifications
| Parameter | Value |
|---|---|
| Output Voltage Range | 1.2 V to 37 V |
| Output Current | In excess of 500 mA |
| Line Regulation | Typical 0.01% (TA = 25°C, 3.0 V ≤ VI − VO ≤ 40 V) |
| Load Regulation | Typical 0.1% (TA = 25°C, 10 mA ≤ IO ≤ 0.5 A) |
| PSRR | 75 dB ~ 60 dB (120 Hz) |
| Package | TO-252-3, DPAK (2 Leads + Tab) |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | 0°C ~ 125°C (TJ) |
| Input Voltage Range | 3.1 V to 40 V |
Key Features
- Adjustable output voltage from 1.2 V to 37 V using only two external resistors.
- Output current in excess of 500 mA.
- Internal current limiting, thermal shutdown, and safe area compensation for robust protection.
- Low output impedance due to NPN Darlington output topology.
- Optional output capacitor for improved transient response.
- High ripple-rejection ratios achievable by bypassing the ADJUST terminal.
- Can function as a precision current regulator by connecting a fixed resistor between the ADJUST and OUTPUT terminals.
Applications
- Programmable output regulation and local on-card regulation.
- Industrial control systems.
- Power bank solutions.
- Power over Ethernet (PoE).
- Motor controls: brushed DC, brushless DC, low-voltage, permanent magnet, and stepper motors.
- High-speed data acquisition and generation.
- Power quality meters and power substation controls.
- RFID readers and intelligent occupancy sensing.
Q & A
- What is the output voltage range of the LM317MABDT?
The output voltage range is from 1.2 V to 37 V.
- What is the maximum output current of the LM317MABDT?
The maximum output current is in excess of 500 mA.
- What type of package does the LM317MABDT come in?
The LM317MABDT comes in a TO-252-3, DPAK (2 Leads + Tab) package.
- What protection features does the LM317MABDT have?
The device includes over current, over temperature, and short circuit protection.
- How is the output voltage of the LM317MABDT adjusted?
The output voltage is adjusted using only two external resistors.
- What is the typical line regulation of the LM317MABDT?
The typical line regulation is 0.01% (TA = 25°C, 3.0 V ≤ VI − VO ≤ 40 V).
- Can the LM317MABDT be used as a precision current regulator?
Yes, by connecting a fixed resistor between the ADJUST and OUTPUT terminals.
- What is the operating temperature range of the LM317MABDT?
The operating temperature range is from 0°C to 125°C (TJ).
- What are some common applications of the LM317MABDT?
Common applications include programmable output regulation, local on-card regulation, industrial control systems, and more.
- Does the LM317MABDT have internal current limiting and thermal shutdown?
Yes, the device includes internal current limiting, thermal shutdown, and safe area compensation.
