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參數(shù)資料
| 型號： | LM2681MDA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 160 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 4/11頁 |
| 文件大?。?/td> | 234K |
| 代理商： | LM2681MDA |
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V+ to GND, or GND to OUT)
5.8V
V+ and OUT Continuous Output Current
30 mA
Output Short-Circuit Duration to GND (Note 2)
1 sec.
Continuous Power
Dissipation (T
A = 25C)(Note 3)
600 mW
T
JMax(Note 3)
150C
θ
JA (Note 3)
210C/W
Operating Junction Temperature
Range
40 to 85C
Storage Temperature Range
65C to +150C
Lead Temp. (Soldering, 10 seconds)
300C
ESD Rating
2kV
Electrical Characteristics
Limits in standard typeface are for T
J = 25C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: V+ = 5V, C
1 = C2 = 3.3 F. (Note 4)
Symbol
Parameter
Condition
Min
Typ
Max
Units
V+
Supply Voltage
2.5
5.5
V
I
Q
Supply Current
No Load
550
1000
A
I
L
Output Current
20
mA
R
SW
Sum of the R
ds(on)of the four
internal MOSFET switches
I
L = 20 mA
8
16
R
OUT
Output Resistance (Note 5)
I
L = 20 mA
15
40
f
OSC
Oscillator Frequency
(Note 6)
80
160
kHz
f
SW
Switching Frequency
(Note 6)
40
80
kHz
P
EFF
Power Efficiency
R
L (1.0k) between GND and
OUT
86
93
%
I
L = 20 mA to GND
90
V
OEFF
Voltage Conversion Efficiency
No Load
99
99.96
%
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 2: OUT may be shorted to GND for one second without damage. However, shorting OUT to V+ may damage the device and should be avoided. Also, for tem-
peratures above 85C, OUT must not be shorted to GND or V+, or device may be damaged.
Note 3: 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.
Note 4: In the test circuit, capacitors C1 and C2 are 3.3 F, 0.3 maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output
voltage and efficiency.
Note 5: Specified output resistance includes internal switch resistance and capacitor ESR. See the details in the application information for positive voltage doubler.
Note 6: The output switches operate at one half of the oscillator frequency, fOSC = 2fSW.
www.national.com
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