LP3944

SNVS264A – MAY 2004 – REVISED APRIL 2013

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Absolute Maximum Ratings

(1) (2) (3)

VDD

−0.5V to 6V

A0, A1, A2, SCL, SDA, RST

6V

(Collectively called digital pins)

Voltage on LED pins

VSS−0.5V to 6V

Junction Temperature

150°C

Storage Temperature

−65°C to 150°C

Power Dissipation(4)

1.76W

Human Body Model

2 kV

ESD(5)

Machine Model

150V

Charge Device Model

1 kV

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is ensured. Operating Ratings do not imply ensured performance limits. For ensured performance limits and

associated test conditions, see the Electrical Characteristics tables.

(2)

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

(3)

If Military/Aerospace specified devices are required, please contact Texas Instruments for availability and specifications.

(4)

The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formulaP =

(TJ—TA)/θJA,

where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal

resistance. The 1.76W rating appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction

temperature, 150°C, for TJ, 85°C for TA, and 37°C/W for θJA. More power can be dissipated safely at ambient temperature below 85°C.

Less power can be dissipated safely at ambient temperatures above 85°C. The Absolute Maximum power dissipation can be increased

by 27 mW for each degree below 85°C, and it must be de-rated by 27 mW for each degree above 85°C. For Operating Ratings

maximum power dissipation, TJ = 125°C and TA = 85°C

(5)

The human-body model is 100 pF discharged through 1.5 k

Ω. The machine model is 0Ω in series with 220 pF.

Operating Ratings

(1) (2)

VDD

2.3V to 5.5V

Junction Temperature

−40°C to +125°C

Operating Ambient Temperature

−40°C to +85°C

Thermal Resistance (

θJA)

WQFN-24(3)

37°C/W

Power Dissipation

1.08W

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is ensured. Operating Ratings do not imply ensured performance limits. For ensured performance limits and

associated test conditions, see the Electrical Characteristics tables.

(2)

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

(3)

The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formulaP =

(TJ—TA)/θJA,

where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal

resistance. The 1.76W rating appearing under Absolute Maximum Ratings results from substituting the Absolute Maximum junction

temperature, 150°C, for TJ, 85°C for TA, and 37°C/W for θJA. More power can be dissipated safely at ambient temperature below 85°C.

Less power can be dissipated safely at ambient temperatures above 85°C. The Absolute Maximum power dissipation can be increased

by 27 mW for each degree below 85°C, and it must be de-rated by 27 mW for each degree above 85°C. For Operating Ratings

maximum power dissipation, TJ = 125°C and TA = 85°C

4

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