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LP3944 数据表(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部件名 LP3944
功能描述  RGB/White/Blue 8-LED Fun Light Driver
PDF  12 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LP3944 数据表(HTML) 5 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
Unless otherwise noted, V
DD = 5.5V. 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. (Note 5)
Symbol
Parameter
Conditions
Typical
Limit
Units
Min
Max
I
2C INTERFACE (SCL AND SDA PINS)
t
CLK-LP
CLK Low Period
(Note 7)
1.3
µs
t
CLK-HP
CLK High Period
(Note 7)
0.6
µs
t
SU
Set-Up Time Repeated
START Condition
(Note 7)
0.6
µs
t
DATA-HOLD
Data Hold Time
(Note 7)
300
ns
t
DATA-SU
Data Set-Up Time
(Note 7)
100
ns
t
SU
Set-Up Time for STOP
Condition
(Note 7)
0.6
µs
t
TRANS
Maximum Pulse Width of
Spikes that Must Be
Suppressed by the Input
Filter of Both DATA & CLK
Signals
(Note 7)
50
ns
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. For Operating Ratings
maximum power dissipation, TJ = 125˚C and TA = 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 220 pF.
Note 5: 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 6: Each LED pin should not exceed 25 mA and the package should not exceed a total of 200 mA.
Note 7: Guaranteed by design.
Typical Performance Characteristics
Frequency vs. Temp
(T
A = −40˚C to +85˚C),
V
DD = 2.3V to 3.0V
20085317
www.national.com
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