LP3947 datasheet(6/14 Pages) NSC

6 / 14 page

Electrical Characteristics, I

2C Interface (Continued)

Unless otherwise noted, V

CHG-IN =VDD = 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 +125˚C.

(Notes 7, 8, 9)

Symbol

Parameter

Conditions

Typ

Limit

Units

Min

Max

Set-Up Time Repeated START

Condition

(Note 8)

0.6

µs

DATA-HOLD

Data Hold Time

(Note 8)

300

DATA-SU

Data Set-Up Time

(Note 8)

100

Set-Up Time for STOP Condition

(Note 8)

0.6

µs

TRANS

Maximum Pulse Width of Spikes that

must be Suppressed by the Input

Filter of both DATA & CLK Signals.

(Note 8)

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: Caution must be taken to avoid raising pins EN and VT 0.3V higher than VCHG-IN and raising pins ISEL, MODE, SCL and SDA 0.3V higher than VBATT.

Note 4: The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula

P= (T

J –TA)

JA,

(1)

where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. The 1.89W rating appearing under

Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150˚C, for TJ, 80˚C for TA, and 37˚C/W for θJA. More power can

be dissipated safely at ambient temperatures below 80˚C. Less power can be dissipated safely at ambient temperatures above 80˚C. The Absolute Maximum power

dissipation can be increased by 27 mW for each degree below 80˚C, and it must be de-rated by 27 mW for each degree above 80˚C.

Note 5: The human-body model is used. The human-body model is 100 pF discharged through 1.5 k

Ω.

Note 6: Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 1.21W rating

appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125˚C, for TJ, 80˚C for TA, and 37˚C/W for θJA into

(1) above. More power can be dissipated at ambient temperatures below 80˚C. Less power can be dissipated at ambient temperatures above 80˚C. The maximum

power dissipation for operation can be increased by 27 mW for each degree below 80˚C, and it must be de-rated by 27 mW for each degree above 80˚C.

Note 7: 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 8: Guaranteed by design.

Note 9: LP3947 is not intended as a Li-Ion battery protection device, any battery used in this application should have an adequate internal protection.

Note 10: The ±10 mA limits apply to all charge currents from 100 mA to 450 mA, to 0.1C End Of Charge (EOC). The limits increase proportionally with higher EOC

points. For example, at 0.2C, the End Of Charge current accuracy becomes ±20 mA.

20111004

FIGURE 1. Li-Ion Charging Profile

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