LP3945 datasheet(6/15 Pages) NSC

6 / 15 page

Electrical Characteristics, I

2C Interface (LP3945 Only) (Continued)

Unless otherwise noted, V

CHG-IN = 5V, VBATT = 4V. Typical values and limits appearing in normal type apply for TJ = 25˚C.

Limits appearing in boldface type apply over the entire junction temperature range for operation, T

J = −40˚C to +85˚C. (Notes

6, 7, 8)

Symbol

Parameter

Conditions

Typical

Limit

Units

Min

Max

TRANS

Maximum Pulse Width of Spikes

that must be Suppressed by the

Input Filter of both DATA & CLK

signals.

(Note 7)

Note 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 guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical

Characteristics tables.

Note 2: All voltages are with respect to the potential at the GND pin.

Note 3: The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula

P= (TJ —TA)/θJA,

(1)

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.

Note 4: The human-body model is 100 pF discharged through 1.5 k

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

Note 5: Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 1.08W rating

appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125˚C, for TJ, 85˚C for TA, and 37˚C/W for θJA into

(1) above. More power can be dissipated at ambient temperatures below 85˚C. Less power can be dissipated at ambient temperatures above 85˚C. The maximum

power dissipation for operation 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.

Note 6: All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with TJ = 25˚C. All hot and cold limits are

guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.

Note 7: Guaranteed by design.

Note 8: LP3945 and LP3946 are not intended as a Li-Ion battery protection device, battery used in this application should have an adequate internal protection.

20066504

The end of charge current threshold default setting is at 0.1C, this threshold can be set to 0.15 or 0.2 by the controller (see bit chart for detail).

Li-Ion Charging Profile

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