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LM2766 bảng dữ liệu(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
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Absolute Maximum Ratings (Note 2)
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 V+ to V
OUT)
5.8V
SD
(GND − 0.3V) to (V+ +
0.3V)
V
OUT Continuous Output Current
40 mA
Output Short-Circuit Duration to GND (Note 3)
1 sec.
Continuous Power
Dissipation (T
A = 25˚C)(Note 4)
600 mW
T
JMax(Note 4)
150˚C
Operating Ratings
θ
JA (Note 4)
210˚C/W
Junction Temperature Range
−40˚ to 100˚C
Ambient Temperature Range
−40˚ to 85˚C
Storage Temperature Range
−65˚C to 150˚C
Lead Temp. (Soldering, 10
seconds)
240˚C
ESD Rating (Note 5)
Human body model
Machine model
2kV
200V
Electrical Characteristics
Limits in standard typeface are for T
J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: V+ = 5V, C
1 =C2 = 1.0 µF. (Note 6)
Symbol
Parameter
Condition
Min
Typ
Max
Units
V+
Supply Voltage
1.8
5.5
V
I
Q
Supply Current
No Load
350
950
µA
I
SD
Shutdown Supply Current
0.1
0.5
µA
T
A = 85˚C
0.2
V
SD
Shutdown Pin Input Voltage
Shutdown Mode
0.6
V
Normal Operation
2.0
I
L
Output Current
2.5V
≤ V
IN ≤ 5.5V
20
mA
1.8V
≤ V
IN < 2.5V
10
R
OUT
Output Resistance (Note 7)
I
L =20 mA
20
55
f
OSC
Oscillator Frequency
(Note 8)
220
400
700
kHz
f
SW
Switching Frequency
(Note 8)
110
200
350
kHz
P
EFF
Power Efficiency
I
L = 20 mA to GND
94
%
V
OEFF
Voltage Conversion Efficiency
No Load
99.96
%
Note 2: 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 3: VOUT may be shorted to GND for one second without damage. However, shorting VOUT to V+ may damage the device and should be avoided. Also, for tem-
peratures above 85˚C, VOUT must not be shorted to GND or V+, or device may be damaged.
Note 4: 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 5: The human body model is a 100pF capacitor discharged through a 1.5k
Ω resistor into each pin. The machine model is a 200pF capacitor discharged directly
into each pin.
Note 6: In the test circuit, capacitors C1 and C2 are 1.0 µF, 0.3Ω maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output
voltage and efficiency.
Note 7: Specified output resistance includes internal switch resistance and capacitor ESR. See the details in the application information for positive voltage doubler.
Note 8: The output switches operate at one half of the oscillator frequency, fOSC =2fSW.
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