LM1085 datasheet(4/13 Pages) NSC

4 / 13 page

Electrical Characteristics (Continued)

Typicals and limits appearing in normal type apply for T

J = 25˚C. Limits appearing in Boldface type apply over the entire junc-

tion temperature range for operation.

Symbol

Parameter

Conditions

Min

(Note 6)

Typ

(Note 5)

Max

(Note 6)

Units

LIMIT

Current Limit

LM1085-ADJ

IN−VOUT =5V

IN−VOUT = 25V

3.2

0.2

5.5

0.5

LM1085-3.3

IN =8V

3.2

5.5

LM1085-5.0

IN = 10V

3.2

5.5

LM1085-12

IN = 17V

3.2

5.5

Minimum Load

Current (Note 10)

LM1085-ADJ

IN −VOUT = 25V

5.0

10.0

Quiescent Current

LM1085-3.3

≤ 18V

5.0

10.0

LM1085-5.0

≤ 20V

5.0

10.0

LM1085-12

≤ 25V

5.0

10.0

Thermal Regulation

A = 25˚C, 30ms Pulse

.004

0.02

%/W

Ripple Rejection

RIPPLE = 120Hz, COUT = 25µF Tantalum, IOUT =3A

LM1085-ADJ, C

ADJ = 25µF, (VIN−VO)=3V

LM1085-3.3, V

IN = 6.3V

LM1085-5.0, V

IN =8V

LM1085-12 V

IN = 15V

Adjust Pin Current

LM1085

120

µA

Adjust Pin Current

Change

10mA

≤ I

OUT

≤ I

FULL LOAD, 1.5V

≤ V

IN−VOUT

≤ 25V

0.2

µA

Temperature

Stability

0.5

Long Term Stability

A=125˚C, 1000Hrs

0.3

1.0

RMS Output Noise

(% of V

OUT)

10Hz

≤ f≤ 10kHz

0.003

Thermal Resistance

Junction-to-Case

3-Lead TO-263: Control Section/Output Section

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, 1.5k

Ω 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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