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LM27342 データシート(PDF) 4 Page - Texas Instruments

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部品番号 LM27342
部品情報  LM27341/LM27342/LM27341-Q1/LM27342-Q1 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator with Frequency Synchronization
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM27342 データシート(HTML) 4 Page - Texas Instruments

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LM27341, LM27342, LM27341-Q1, LM27342-Q1
SNVS497E – NOVEMBER 2008 – REVISED APRIL 2013
www.ti.com
Electrical Characteristics
Specifications with standard typeface are for TJ = 25°C, and those in boldface type apply over the full Operating
Temperature Range (TJ = -40°C to 125°C). VIN = 12V, and VBOOST - VSW = 4.3V unless otherwise specified. Datasheet
min/max specification limits are ensured by design, test, or statistical analysis.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SYSTEM PARAMETERS
TJ = 0°C to 85°C
0.990
1.0
1.010
VFB
Feedback Voltage
V
TJ = -40°C to 125°C
0.984
1.0
1.014
Feedback Voltage Line
ΔVFB/ΔVIN
VIN = 3V to 20V
0.003
% / V
Regulation
IFB
Feedback Input Bias Current
20
100
nA
Over Voltage Protection, VFB at
OVP
1.13
V
which PWM Halts.
Undervoltage Lockout
VIN Rising until VSW is Switching
2.60
2.75
2.90
UVLO
V
UVLO Hysteresis
VIN Falling from UVLO
0.30
0.47
0.6
SS
Soft Start Time
0.5
1
1.5
ms
Quiescent Current, IQ = IQ_AVIN +
VFB = 1.1 (not switching)
2.4
mA
IQ_PVIN
IQ
Quiescent Current, IQ = IQ_AVIN +
VEN = 0V (shutdown)
70
nA
IQ_PVIN
fSW= 2 MHz
8.2
10
IBOOST
Boost Pin Current
mA
fSW= 1 MHz
4.4
6
OSCILLATOR
fSW
Switching Frequency
SYNC = GND
1.75
2
2.3
MHz
FB Pin Voltage where SYNC input
VFB_FOLD
0.53
V
is overridden.
fFOLD_MIN
Frequency Foldback Minimum
VFB = 0V
220
250
kHz
LOGIC INPUTS (EN, SYNC)
fSYNC
SYNC Frequency Range
1
2.35
MHz
VIL
EN, SYNC Logic low threshold
Logic Falling Edge
0.4
V
VIH
EN, SYNC Logic high threshold
Logic Rising Edge
1.8
SYNC, Time Required above VIH
tSYNC_HIGH
100
ns
to Ensure a Logical High.
SYNC, Time Required below VIL
tSYNC_LOW
100
ns
to Ensure a Logical Low.
ISYNC
SYNC Pin Current
VSYNC < 5V
20
nA
VEN = 3V
6
15
IEN
Enable Pin Current
µA
VIN = VEN = 20V
50
100
INTERNAL MOSFET
RDS(ON)
Switch ON Resistance
150
320
m
ICL
Switch Current Limit
LM27342
2.5
4.0
A
LM27341
2.0
3.7
DMAX
Maximum Duty Cycle
SYNC = GND
85
93
%
tMIN
Minimum on time
65
ns
ISW
Switch Leakage Current
40
nA
BOOST LDO
VLDO
Boost LDO Output Voltage
3.9
V
THERMAL
TSHDN
Thermal Shutdown Temperature
Junction temperature rising
165
°C
Thermal Shutdown Hysteresis
Junction temperature falling
15
°C
4
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Copyright © 2008–2013, Texas Instruments Incorporated
Product Folder Links: LM27341 LM27342 LM27341-Q1 LM27342-Q1


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