LP3981 datasheet(4/21 Pages) TI

Part #	LP3981

Description	LP3981 Micropower, 300mA Ultra Low-Dropout CMOS Voltage Regulator

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Manufacturer	TI [Texas Instruments]

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equations:

where TJ(MAX) is the maximum junction temperature, TA is the ambient temperature, and θ JA is the

LP3981

SNVS159G – OCTOBER 2001 – REVISED MAY 2013

www.ti.com

Absolute Maximum Ratings

(1) (2) (3)

VIN, VEN

−0.3 to 6.5V

VOUT, VOUT-SENSE

−0.3 to VIN + 0.3, Max 6.5V

Junction Temperature

150°C

Storage Temperature

−65°C to +150°C

Lead Temp.

Pad Temp.

Power Dissipation (4)

θJA (VSSOP-8)

210°C/W

θJA (WSON-6)

50°C/W

Maximum Power Dissipation at 25°C

VSSOP-8

595mW

WSON-6

2.5W

ESD Rating(5)

Human Body Model

2kV

Machine Model

200V

(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.

(2)

All voltages are with respect to the potential at the GND pin.

(3)

If Military/Aerospace specified devices are required, please contact the TI Sales Office/Distributors for availability and specifications.

(4)

The figures given for Absolute Maximum Power dissipation for the device are calculated using the following

junction-to-ambient thermal resistance. E.g. for the WSON package

θ JA=50°C/W, TJ(MAX)=150°C and using TA=25°C the maximum

power dissipation is found to be 2.5W. The derating factor (

−1/θJA) = −20mW/°C, thus below 25°C the power dissipation figure can be

increased by 20 mW per degree, and similarity decreased by this factor for temperatures above 25°C

(5)

The human body model is 100pF discharged through 1.5k

Ω resistor into each pin. The machine model is a 200 pF capacitor discharged

directly into each pin.

Operating Ratings

(1) (2)

VIN

2.7 to 6V

VEN

0 to VIN

Junction Temperature

−40°C to +125°C

Maximum Power Dissipation (3)

VSSOP-8

476mW

WSON-6

2.0W

(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.

(2)

All voltages are with respect to the potential at the GND pin.

(3)

As for the Maximum Power dissipation, the maximum power in operation is dependant on the ambient temperature. This can be

calculated in the same way using TJ=125°C, giving 2W as the maximum power dissipation for the WSON package in operation. The

same derating factor applies.

4

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