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LM2841 데이터시트(PDF) 4 Page - Texas Instruments

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부품명 LM2841
상세설명  LM2840/LM2841/LM2842/ LM2840-Q1/LM2841-Q1/LM2842-Q1 100/300/600 mA 42V Input Step-Down DC/DC Regulator in Thin SOT
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홈페이지  http://www.ti.com
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LM2841 데이터시트(HTML) 4 Page - Texas Instruments

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LM2841, LM2842
SNVS540H – MARCH 2009 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics (continued)
Specifications in standard type face are for TJ = 25°C and those with boldface type apply over the full Operating
Temperature Range ( TJ = −40°C to +125°C). Minimum and Maximum limits are specified through test, design, or statistical
correlation. Typical values represent the most likely parametric norm at TJ = +25°C, and are provided for reference purposes
only. Unless otherwise stated the following conditions apply: VIN = 12V.
Symbol
Parameter
Conditions
Min (1)
Typ (2)
Max (1)
Units
tON(min)
Minimum ON time
See (6)
100
150
ns
tOFF(min)
Minimum OFF time
X option
110
370
ns
Y option
104
200
ns
fSW
LM2840/41/42X, VFB = 0.5V
325
550
750
kHz
LM2840/41/42X, VFB = 0V
140
Switching frequency
LM2840/41/42Y, VFB = 0.5V
0.95
1.25
1.50
MHz
LM2840/41/42Y, VFB = 0V
0.35
DMAX
Maximum duty cycle
LM2840/41/42X
88
94
%
LM2840/41/42Y
81
87
VUVP
Undervoltage lockout
On threshold
4.4
3.7
V
thresholds
Off threshold
3.5
3.25
V SHDN
Shutdown threshold
Device on
2.3
1.0
V
Device off
0.9
0.3
ISHDN
Shutdown pin input bias current VSHDN = 2.3V
(5)
0.05
1.5
µA
VSHDN = 0V
0.02
1.5
THERMAL SPECIFICATIONS
RθJA
Junction-to-Ambient Thermal
See (7)
121
°C/W
Resistance, SOT-6L Package
RθJC
Junction-to-Case Thermal
94
°C/W
Resistance, SOT-6L Package
(6)
Minimum On Time specified by design and simulation.
(7)
All numbers apply for packages soldered directly onto a 3" x 3" PC board with 2 oz. copper on 4 layers in still air in accordance to
JEDEC standards. Thermal resistance varies greatly with layout, copper thickness, number of layers in PCB, power distribution, number
of thermal vias, board size, ambient temperature, and air flow.
4
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Product Folder Links: LM2841 LM2842


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