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LM2651 データシート(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部品番号 LM2651
部品情報  1.5A High Efficiency Synchronous Switching Regulator
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2651 データシート(HTML) 5 Page - National Semiconductor (TI)

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All Output Voltage Versions (Continued)
Specifications in standard type face are for T
J = 25˚C and those with boldface type apply over full operating junction tem-
perature range. V
IN =10V unless otherwise specified.
Symbol
Parameter
Conditions
Typical
Limit
Units
I
EA_SOURCE
Error Amplifier Source
Current
40
25/15
µA
µA(min)
I
EA_SINK
Error Amplifier Sink Current
65
30
µA
µA(min)
V
EAH
Error Amplifier Output Swing
Upper Limit
2.70
2.50/2.40
V
V(min)
V
EAL
Error Amplifier Output Swing
Lower Limit
1.25
1.35/1.50
V
V(max)
V
D
Body Diode Voltage
I
DIODE = 1.5A
1
V
f
OSC
Oscillator Frequency
V
IN = 4V
300
280/255
330/345
kHz
kHz(min)
kHz(max)
D
MAX
Maximum Duty Cycle
V
IN = 4V
95
92
%
%(min)
I
SS
Soft-Start Current
Voltage at the SS pin = 1.4V
11
7
14
µA
µA(min)
µA(max)
I
SHUTDOWN
Shutdown Pin Current
Shutdown Pin Pulled Low
2.2
0.8/0.5
3.7/4.0
µA
µA(min)
µA(max)
v
SHUTDOWN
Shutdown Pin Threshold
Voltage
Falling Edge
0.6
0.3
0.9
V
V(min)
V(max)
T
SD
Thermal Shutdown
Temperature
165
˚C
T
SD_HYST
Thermal Shutdown
Hysteresis Temperature
25
˚C
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is in-
tended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see
the Electrical Characteristics.
Note 2: The maximum allowable power dissipation is calculated by using PDmax = (TJmax −TA)/θJA , where TJmax is the maximum junction temperature, TA is the
ambient temperature, and
θJA is the junction-to-ambient thermal resistance of the specified package. The 893 mW rating results from using 150˚C, 25˚C, and
140˚C/W for TJmax,TA, and θJA respectively. A θJA of 140˚C/W represents the worst-case condition of no heat sinking of the 16-pin TSSOP package. Heat sinking
allows the safe dissipation of more power. The Absolute Maximum power dissipation must be derated by 7.14mW per ˚C above 25˚C ambient. The LM2651 actively
limits its junction temperature to about 165˚C.
Note 3: The human body model is a 100pF capacitor discharged through a 1.5k
Ω resistor into each pin.
Note 4: Typical numbers are at 25˚C and represent the most likely norm.
Note 5: All limits are guaranteed at room temperature (standard typeface) and at temperature extremes (boldface type ). All room temperature limits are 100%
production tested. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods. All limits are used to
calculate Average Outgoing Quality Level (AOQL).
www.national.com
5


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