參數(shù)資料
型號(hào)： LP3923TLX-VC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PBGA30
封裝： 3 X 2.50 MM, MICRO SMD-30
文件頁數(shù)： 5/32頁
文件大?。?/td> 1718K
代理商： LP3923TLX-VC
Serial Interface
Unless otherwise noted, V
IN = BATT = 3.6V, GND = 0V, CVIN1–2 = 10 F CLDOx = 1 F and VLDO3 = 3.0V. Typical values and limits
appearing in normal type apply for T
J = 25°C. Limits appearing in boldface type apply over the entire junction temperature range
for operation, T
A = TJ = 40°C to +125°C. (Note 6, Note 7)
Symbol
Parameter
Conditions
Typ
Limit
Units
Min
Max
f
CLK
Clock Frequency
400
kHz
t
BF
Bus-Free Time between START
and STOP
1.3
s
t
HOLD
Hold Time Repeated START
Condition
0.6
s
t
CLK-LP
CLK Low Period
1.3
s
t
CLK-HP
CLK High Period
0.6
s
t
SU
Set-Up Time Repeated START
Condition
0.6
s
t
DATA-HOLD
Data Hold Time
50
ns
t
DATA-SU
Data Set-Up Time
100
ns
t
SU
Set-Up Time for STOP Condition
0.6
s
t
TRANS
Maximum Pulse Width of Spikes
that Must Be Suppressed by the
Input Filter of Both DATA & CLK
Signals
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:
Internal Thermal Shutdown circuitry protects the device from permanent damage.
Note 4:
The human-body model is 100 pF discharged through 1.5 k
. The machine model is a 200 pF capacitor discharged directly into each pin, MIL-STD-883
3015.7.
Note 5:
Care must be exercised where high power dissipation is likely. The maximum ambient temperature may have to be derated. Maximum ambient
temperature (TA-MAX) is dependant on the maximum operating junction temperature (TJ-MAX-OP), the maximum power dissipation of the device in the application
(PD-MAX), and the junction to ambient thermal resistance of the package in the application (
θJA). This relationship is given by the following equation:
TA-MAX = TJ-MAX-OP - (
θJA x PD-MAX)
Note 6:
All limits are guaranteed. All electrical characteristics having room-temperature limits are tested during production with T
J = 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:
Dropout voltage is the input-to-output voltage difference at which the output voltage is 100 mV below its nominal value. This specification does not apply
in cases it implies operation with an input voltage below the 2.5V minimum appearing under Operating Ratings. For example, this specification does not apply
for devices having 1.5V outputs because the specification would imply operation with an input voltage at or about 1.5V.
Note 9:
Junction-to-ambient thermal resistance is highly application and board-layout dependent. In applications where high maximum power dissipation exists,
special care must be paid to thermal dissipation issues in board design.
Note 10:
Full charging current is guaranteed for CHG_IN = 4.5 to 6.8V, but particularly at higher input voltages. Increased power dissipation may cause the
thermal regulation to limit the current to a safe level, resulting in longer charging time.
Note 11:
Buck output voltage accuracy depends on the accuracy of the external feedback resistors. Resistor values should be chosen for the divider network to
ensure that at the desired output voltage the FB pin is at the specified value of 0.5V. See Buck Converter Application Information.
13
www.national.com
LP3923
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