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LM2734XMKX bảng dữ liệu(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM2734XMKX
Giải thích chi tiết về linh kiện  Thin SOT23 1A Load Step-Down DC-DC Regulator
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN
-0.5V to 24V
SW Voltage
-0.5V to 24V
Boost Voltage
-0.5V to 30V
Boost to SW Voltage
-0.5V to 6.0V
FB Voltage
-0.5V to 3.0V
EN Voltage
-0.5V to (V
IN + 0.3V)
Junction Temperature
150˚C
ESD Susceptibility (Note 2)
2kV
Storage Temp. Range
-65˚C to 150˚C
Soldering Information
Infrared/Convection Reflow (15sec)
220˚C
Wave Soldering Lead Temp. (10sec)
260˚C
Operating Ratings (Note 1)
V
IN
3V to 20V
SW Voltage
-0.5V to 20V
Boost Voltage
-0.5V to 25V
Boost to SW Voltage
1.6V to 5.5V
Junction Temperature Range
−40˚C to +125˚C
Thermal Resistance
θ
JA (Note 3)
118˚C/W
Electrical Characteristics
Specifications with standard typeface are for T
J = 25˚C, and those in boldface type apply over the full Operating Tempera-
ture Range (T
J = -40˚C to 125˚C). VIN = 5V, VBOOST -VSW = 5V unless otherwise specified. Datasheet min/max specification
limits are guaranteed by design, test, or statistical analysis.
Symbol
Parameter
Conditions
Min
(Note 4)
Typ
(Note 5)
Max
(Note 4)
Units
V
FB
Feedback Voltage
0.784
0.800
0.816
V
∆V
FB/
∆V
IN
Feedback Voltage Line
Regulation
V
IN =3Vto20V
0.01
% / V
I
FB
Feedback Input Bias Current
Sink/Source
10
250
nA
UVLO
Undervoltage Lockout
V
IN Rising
2.74
2.90
V
Undervoltage Lockout
V
IN Falling
2.0
2.3
UVLO Hysteresis
0.30
0.44
0.62
F
SW
Switching Frequency
LM2734X
1.2
1.6
1.9
MHz
LM2734Y
0.40
0.55
0.66
D
MAX
Maximum Duty Cycle
LM2734X
85
92
%
LM2734Y
90
96
D
MIN
Minimum Duty Cycle
LM2734X
2
%
LM2734Y
1
R
DS(ON)
Switch ON Resistance
V
BOOST -VSW = 3V
300
600
m
I
CL
Switch Current Limit
V
BOOST -VSW =3V
1.2
1.7
2.5
A
I
Q
Quiescent Current
Switching
1.5
2.5
mA
Quiescent Current (shutdown)
V
EN =0V
30
nA
I
BOOST
Boost Pin Current
LM2734X (50% Duty Cycle)
2.5
3.5
mA
LM2734Y (50% Duty Cycle)
1.0
1.8
V
EN_TH
Shutdown Threshold Voltage
V
EN Falling
0.4
V
Enable Threshold Voltage
V
EN Rising
1.8
I
EN
Enable Pin Current
Sink/Source
10
nA
I
SW
Switch Leakage
40
nA
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see Electrical Characteristics.
Note 2: Human body model, 1.5k
Ω in series with 100pF.
Note 3: Thermal shutdown will occur if the junction temperature exceeds 165˚C. The maximum power dissipation is a function of TJ(MAX) , θJA and TA . The
maximum allowable power dissipation at any ambient temperature is PD =(TJ(MAX) –TA)/θJA . All numbers apply for packages soldered directly onto a 3” x 3” PC
board with 2oz. copper on 4 layers in still air. For a 2 layer board using 1 oz. copper in still air,
θJA = 204˚C/W.
Note 4: Guaranteed to National’s Average Outgoing Quality Level (AOQL).
Note 5: Typicals represent the most likely parametric norm.
www.national.com
3


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