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LM27342 の電気的特性と機能

LM27342のメーカーはNational Semiconductorです、この部品の機能は「2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 LM27342
部品説明 2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC Regulator
メーカ National Semiconductor
ロゴ National Semiconductor ロゴ 




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LM27342 Datasheet, LM27342 PDF,ピン配置, 機能
December 16, 2008
www.DataSheet4U.com
LM27341/LM27342
2 MHz 1.5A/2A Wide Input Range Step-Down DC-DC
Regulator with Frequency Synchronization
General Description
The LM27341 and LM27342 regulators are monolithic, high
frequency, PWM step-down DC-DC converters in 10-pin LLP
and 10-pin eMSOP packages. They contain all the active
functions to provide local DC-DC conversion with fast tran-
sient response and accurate regulation in the smallest possi-
ble PCB area.
With a minimum of external components the LM27341 and
LM27342 are easy to use. The ability to drive 1.5A or 2A loads
respectively, with an internal 150 mNMOS switch results in
the best power density available. The world-class control cir-
cuitry allows for on-times as low as 65 ns, thus supporting
exceptionally high frequency conversion. Switching frequen-
cy is internally set to 2 MHz and synchronizable from 1 to 2.35
MHz, which allows the use of extremely small surface mount
inductors and chip capacitors. Even though the operating fre-
quency is very high, efficiencies up to 90% are easy to
achieve. External shutdown is included featuring an ultra-low
shutdown current of 70 nA. The LM27341and LM27342 utilize
peak current-mode control and internal compensation to pro-
vide high-performance regulation over a wide range of oper-
ating conditions. Additional features include internal soft-start
circuitry to reduce inrush current, pulse-by-pulse current limit,
thermal shutdown, and output over-voltage protection.
Features
Space saving 3 X 3 mm LLP-10 & eMSOP-10 package
Wide input voltage range
3 to 20 V
Wide output voltage range
1 to 18 V
LM27341 delivers 1.5A maximum output current
LM27342 delivers 2A maximum output current
High switching frequency
2 MHz
Frequency synchronization 1.00 MHz < fSW < 2.35 MHz
150 mNMOS switch with internal bootstrap supply
70 nA shutdown current
Internal voltage reference accuracy of 1%
Peak Current-Mode, PWM operation
Thermal shutdown
Applications
Local 12V to Vcore Step-Down Converters
Radio Power Supply
Core Power in HDDs
Set-Top Boxes
Automotive
USB Powered Devices
DSL Modems
Typical Application Circuit
30005674
30005676
Efficiency vs Load Current
VOUT = 5V, fsw = 2 MHz
© 2008 National Semiconductor Corporation 300056
www.national.com

1 Page





LM27342 pdf, ピン配列
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
AVIN, PVIN
SW Voltage
Boost Voltage
Boost to SW Voltage
FB Voltage
SYNC Voltage
EN Voltage
Storage Temperature Range
Junction Temperature
-0.5V to 24V
-0.5V to 24V
-0.5V to 28V
-0.5V to 6.0V
-0.5V to 3.0V
-0.5V to 6.0V
-0.5V to (VIN + 0.3V)
−65°C to +150°C
150°C
ESD Susceptibility (Note 2)
Soldering Information
Infrared Reflow (5sec)
2kV
www.DataSheet4U.com
260°C
Operating Ratings (Note 1)
AVIN, PVIN
3V to 20V
SW Voltage
-0.5V to 20V
Boost Voltage
-0.5V to 24V
Boost to SW Voltage
3.0V to 5.5V
Junction Temperature Range
−40°C to +125°C
Thermal Resistance (θJA) LLP10 (Note 3)
Thermal Resistance (θJA) eMSOP10 (Note 3)
33°C/W
45°C/W
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 guaranteed by design, test, or statistical analysis.
Symbol
Parameter
Conditions
Min Typ Max Units
SYSTEM PARAMETERS
VFB
ΔVFBVIN
IFB
OVP
Feedback Voltage
Feedback Voltage Line Regulation
Feedback Input Bias Current
Over Voltage Protection, VFB at
which PWM Halts.
TJ = 0°C to 85°C
TJ = -40°C to 125°C
VIN = 3V to 20V
0.990
0.984
1.0
1.0
0.003
20
1.13
1.010
1.014
100
V
%/V
nA
V
UVLO
SS
Undervoltage Lockout
UVLO Hysteresis
Soft Start Time
VIN Rising until VSW is Switching
VIN Falling from UVLO
2.60
0.30
0.5
2.75
0.47
1
2.90
0.6
1.5
V
ms
Quiescent Current, IQ = IQ_AVIN +
IQ
IQ_PVIN
Quiescent Current, IQ = IQ_AVIN +
IQ_PVIN
IBOOST
Boost Pin Current
OSCILLATOR
VFB = 1.1 (not switching)
VEN = 0V (shutdown)
fSW= 2 MHz
fSW= 1 MHz
2.4 mA
70 nA
8.2 10
mA
4.4 6
fSW
VFB_FOLD
Switching Frequency
FB Pin Voltage where SYNC input
is overridden.
SYNC = GND
1.75 2
2.3 MHz
0.53 V
fFOLD_MIN
Frequency Foldback Minimum
LOGIC INPUTS (EN, SYNC)
VFB = 0V
220 250 kHz
fSYNC
VIL
VIH
tSYNC_HIGH
SYNC Frequency Range
EN, SYNC Logic low threshold
EN, SYNC Logic high threshold
SYNC, Time Required above VIH to
Ensure a Logical High.
Logic Falling Edge
Logic Rising Edge
1
1.8
2.35 MHz
0.4
V
100 ns
tSYNC_LOW
SYNC, Time Required below VIL to
Ensure a Logical Low.
100 ns
ISYNC
IEN
SYNC Pin Current
Enable Pin Current
VSYNC < 5V
VEN = 3V
VIN = VEN = 20V
20 nA
6 15
µA
50 100
3 www.national.com


3Pages


LM27342 電子部品, 半導体
Line Transient
VIN = 10 to 15V, VOUT = 3.3V, no CFF
Refer to Figure 13
VIN
=
Line
10 to
1T5rVan,wVswiOewUnT.tD=a3ta.3SVheet4U.com
Refer to Figure 12
300056109
Short Circuit
300056108
Short Circuit Release
300056110
Soft Start
300056111
Soft Start with EN Tied to VIN
www.national.com
30005653
6
30005654

6 Page



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