LM317DCYR 3-Terminal Adjustable Regulator Electronics Ic Chip

LM317DCYR 3-TERMINAL ADJUSTABLE REGULATOR

FEATURES

Output Voltage Range Adjustable From 1.25 V

Thermal Overload Protection to 37 V

Output Safe-Area Compensation

Output Current Greater Than 1.5 A

Internal Short-Circuit Current Limiting

DESCRIPTION/ORDERING INFORMATION

LM317 3-TERMINAL ADJUSTABLE REGULATOR SLVS044R–SEPTEMBER 1997–REVISED APRIL 2007 • Output Voltage Range Adjustable From 1.25 V • Thermal Overload Protection to 37 V • Output Safe-Area Compensation • Output Current Greater Than 1.5 A • Internal Short-Circuit Current Limiting The LM317 is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It is exceptionally easy to use and requires only two external resistors to set the output voltage. Furthermore, both line and load regulation are better than standard fixed regulators.

In addition to having higher performance than fixed regulators, this device includes on-chip current limiting, thermal overload protection, and safe operating-area protection. All overload protection remains fully functional, even if the ADJUST terminal is disconnected.

The LM317 is versatile in its applications, including uses in programmable output regulation and local on-card regulation. Or, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the LM317 can function as a precision current regulator. An optional output capacitor can be added to improve transient response. The ADJUST terminal can be bypassed t

ORDERING INFORMATION(1)

Absolute Maximum Ratings (1)

over virtual junction temperature range (unless otherwise noted)

(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Package Thermal Data (1)

(1) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

(2) For packages with exposed thermal pads, such as QFN, PowerPAD™, or PowerFLEX™, θJP is defined as the thermal resistance between the die junction and the bottom of the exposed pad

Recommended Operating Conditions

Electrical Characteristics

over recommended ranges of operating virtual junction temperature (unless otherwise noted)

(1) Unless otherwise noted, the following test conditions apply: |VI – VO| = 5 V and IOMAX = 1.5 A, TJ = 0°C to 125°C. Pulse testing techniques are used to maintain the junction temperature as close to the ambient temperature as possible. (2) Line regulation is expressed here as the percentage change in output voltage per 1-V change at the input. (3) CADJ is connected between the ADJUST terminal and GND. (4) Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

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