Overview
The LM317MQDCYRG4 is an adjustable 3-terminal positive voltage regulator produced by Texas Instruments. This component is part of the LM317 family, known for its high performance and ease of use. The LM317MQDCYRG4 can supply output currents greater than 500 mA over an adjustable output voltage range of 1.25 V to 37 V. It features internal short-circuit current limiting, thermal-overload protection, and safe-area compensation, making it a reliable choice for various applications. The device is exceptionally easy to use, requiring only two external resistors to set the desired output voltage.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Input-to-output differential voltage (VI - VO) | 2.5 | 40 | V |
| Operating virtual junction temperature (TJ) | -40 | 125 | °C |
| Output current (IO) | 0.01 | 0.5 | A |
| Output voltage range | 1.25 | 37 | V |
| Junction-to-ambient thermal resistance (RθJA) | 60.2 | °C/W | |
| Junction-to-case (top) thermal resistance (RθJCtop) | 42.0 | °C/W | |
| Storage temperature range (TSTG) | -65 | 150 | °C |
Key Features
- Adjustable output voltage range from 1.25 V to 37 V
- Output current greater than 500 mA
- Internal short-circuit current limiting
- Thermal-overload protection
- Safe-area compensation
- No ground terminal; quiescent current flows to the load instead of ground
- High line and load regulation performance
- Optional input and output capacitors for improved stability and transient response
- Adjustment terminal can be bypassed with a capacitor for high ripple-rejection ratios
Applications
- Electronic point-of-sale systems
- Medical and health/fitness applications
- Printers
- Appliances and white goods
- TV and set-top box applications
- General power supply designs requiring adjustable voltage regulation
Q & A
- What is the output voltage range of the LM317MQDCYRG4?
The output voltage range is adjustable from 1.25 V to 37 V.
- What is the maximum output current of the LM317MQDCYRG4?
The maximum output current is greater than 500 mA.
- Does the LM317MQDCYRG4 have built-in protection features?
Yes, it includes internal short-circuit current limiting, thermal-overload protection, and safe-area compensation.
- How do I set the output voltage of the LM317MQDCYRG4?
The output voltage can be set using two external resistors connected to the ADJUST terminal.
- Is an input capacitor required for the LM317MQDCYRG4?
An input capacitor is not required but is recommended if the regulator is not close to the power-supply filter capacitors.
- What is the purpose of the adjustment terminal capacitor?
The adjustment terminal capacitor improves ripple rejection and can achieve high ripple-rejection ratios.
- Can the LM317MQDCYRG4 be used as a current source?
Yes, the device can be used as a floating current source controlled by a single resistor.
- What are the thermal characteristics of the LM317MQDCYRG4?
The junction-to-ambient thermal resistance (RθJA) is 60.2 °C/W, and the junction-to-case (top) thermal resistance (RθJCtop) is 42.0 °C/W.
- What is the storage temperature range for the LM317MQDCYRG4?
The storage temperature range is from -65 °C to 150 °C.
- What are some common applications of the LM317MQDCYRG4?
Common applications include electronic point-of-sale systems, medical and health/fitness applications, printers, appliances, and TV/set-top box applications.
