NCV317BD2TR4G 1.5A Adjustable Output Positive Voltage Linear Regulator 40V Input TO-263-2

NCV317BD2TR4G Product Overview

The NCV317BD2TR4G is an automotive-grade adjustable positive linear voltage regulator from onsemi's NCV317 series, housed in a TO-263-2 (D2PAK) surface-mount package. It delivers output current in excess of 1.5A with an adjustable output voltage programmable from 1.2V to 37V using two external resistors. Operating from a maximum input voltage of 40V with a typical dropout of only 2.25V, the device integrates internal current limiting, thermal shutdown, and safe-area compensation, featuring an ultra-high PSRR of 80dB at 120Hz. The NCV317BD2TR4G is AEC-Q100 qualified with an operating junction temperature range of -55°C to +150°C, specifically designed for automotive and other applications requiring unique site and control change requirements. As a pin-compatible LM317 replacement, it is widely used in automotive infotainment, instrument clusters, body control modules, industrial control, and power management applications.

Typical Applications

Automotive electronics voltage regulation

Industrial control equipment adjustable power supply

Local and on-card regulation

Programmable output regulator

Precision current regulator (with a fixed resistor between adjustment and output)

Floating operation for high voltage applications

Battery chargers

Consumer electronics power supplies

FAQ

Q: How is the output voltage set?
A: The device sets output voltage via two external resistors from 1.2V to 37V. The formula is: VOUT = 1.25 × (1 + R2/R1), with R1 typically selected as 240Ω to set approximately 5mA through the ADJ pin. The device can also be used as a programmable output regulator, or as a precision current regulator by connecting a fixed resistor between the adjustment and output.

Q: What is the PSRR?
A: 65dB at 120Hz, effectively suppressing input supply ripple effects on the output voltage.

Q: What protection features are integrated?
A: Internal thermal overload protection, internal short circuit current limiting (constant over temperature), and output transistor safe-area compensation, making it essentially blow-out proof.

Q: What is the difference between NCV317BD2TR4G and LM317BD2TR4G?
A: Both share essentially identical core parameters, with the primary difference being temperature grade and qualification: NCV317BD2TR4G is automotive-grade (AEC-Q100) with -55℃ to +150℃ junction temperature range; LM317BD2TR4G is industrial-grade with -40℃ to +125℃ range. Select based on application temperature and qualification requirements.

Q: What should be noted for thermal design?
A: The NCV317B generates significant heat at higher output currents or larger input-output voltage differentials. Power dissipation is calculated as P = (VIN - VOUT) × IOUT. The TO-263-2 (D²PAK) package tab is connected to pin 2 (VOUT) and should be soldered to sufficient PCB copper area for enhanced heat dissipation. A large ground plane is recommended as a heatsink.

Q: Is this device suitable for automotive applications?
A: Yes. The NCV317BD2TR4G is AEC-Q100 qualified with an operating junction temperature range of -55℃ to +150℃, suitable for automotive electronics and other applications requiring unique site and control change requirements.

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