National Instruments LM1085 Series manual 10.0, 120

LM1085

Electrical Characteristics (Continued)

Typicals and limits appearing in normal type apply for TJ = 25˚C. Limits appearing in Boldface type apply over the entire junc- tion temperature range for operation.

Symbol	Parameter	Conditions	Min	Typ	Max	Units
			(Note 6)	(Note 5)	(Note 6)
ILIMIT	Current Limit	LM1085-ADJ
		VIN−VOUT = 5V	3.2	5.5		A
		VIN−VOUT = 25V	0.2	0.5		A
		LM1085-3.3
		VIN = 8V	3.2	5.5		A
		LM1085-5.0
		VIN = 10V	3.2	5.5		A
		LM1085-12
		VIN = 17V	3.2	5.5		A
	Minimum Load	LM1085-ADJ
	Current (Note 10)	VIN −VOUT = 25V		5.0	10.0	mA
	Quiescent Current	LM1085-3.3
		VIN ≤ 18V		5.0	10.0	mA
		LM1085-5.0
		VIN ≤ 20V		5.0	10.0	mA
		LM1085-12
		VIN ≤ 25V		5.0	10.0	mA
	Thermal Regulation	TA = 25˚C, 30ms Pulse		.004	0.02	%/W
	Ripple Rejection	fRIPPLE = 120Hz, COUT = 25µF Tantalum, IOUT = 3A
		LM1085-ADJ, CADJ = 25µF, (VIN−VO) = 3V	60	75		dB
		LM1085-3.3, VIN = 6.3V	60	72		dB
		LM1085-5.0, VIN = 8V	60	68		dB
		LM1085-12 VIN = 15V	54	60		dB
	Adjust Pin Current	LM1085		55	120	µA
	Adjust Pin Current	10mA ≤ IOUT ≤ IFULL LOAD, 1.5V ≤ VIN−VOUT ≤ 25V
	Change			0.2	5	µA
	Temperature			0.5		%
	Stability
	Long Term Stability	TA=125˚C, 1000Hrs		0.3	1.0	%
	RMS Output Noise	10Hz ≤ f≤ 10kHz		0.003		%
	(% of VOUT)
	Thermal Resistance	3-Lead TO-263: Control Section/Output Section			0.7/3.0	˚C/W
	Junction-to-Case	3-Lead TO-220: Control Section/Output Section			0.7/3.0	˚C/W

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: Power dissipation is kept in a safe range by current limiting circuitry. Refer to Overload Recovery in Application Notes.

Note 3: The maximum power dissipation is a function of TJ(max) , θJA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(max)–T A)/θJA. All numbers apply for packages soldered directly into a PC board. Refer to Thermal Considerations in the Application Notes.

Note 4: For testing purposes, ESD was applied using human body model, 1.5kΩ in series with 100pF.

Note 5: Typical Values represent the most likely parametric norm.

Note 6: All limits are guaranteed by testing or statistical analysis.

Note 7: IFULL LOAD is defined in the current limit curves. The IFULL LOAD Curve defines the current limit as a function of input-to-output voltage. Note that 30W power dissipation for the LM1085 is only achievable over a limited range of input-to-output voltage.

Note 8: Load and line regulation are measured at constant junction temperature, and are guaranteed up to the maximum power dissipation of 30W. Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.

Note 9: Dropout voltage is specified over the full output current range of the device.

Note 10: The minimum output current required to maintain regulation.

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