LM2731 PDF даташит
Спецификация LM2731 изготовлена «National Semiconductor» и имеет функцию, называемую «0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23». |
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Детали детали
Номер произв | LM2731 |
Описание | 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23 |
Производители | National Semiconductor |
логотип |
16 Pages
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July 2003
LM2731
0.6/1.6 MHz Boost Converters With 22V Internal FET
Switch in SOT-23
General Description
The LM2731 switching regulators are current-mode boost
converters operating at fixed frequencies of 1.6 MHz (“X”
option) and 600 kHz (“Y” option).
The use of SOT-23 package, made possible by the minimal
power loss of the internal 1.8A switch, and use of small
inductors and capacitors result in the industry’s highest
power density. The 22V internal switch makes these solu-
tions perfect for boosting to voltages up to 20V.
These parts have a logic-level shutdown pin that can be
used to reduce quiescent current and extend battery life.
Protection is provided through cycle-by-cycle current limiting
and thermal shutdown. Internal compensation simplifies de-
sign and reduces component count.
Switch Frequency
X
1.6 MHz
Y
0.6 MHz
Features
n 22V DMOS FET switch
n 1.6 MHz (“X”), 0.6 MHz (“Y”) switching frequency
n Low RDS(ON) DMOS FET
n Switch current up to 1.8A
n Wide input voltage range (2.7V–14V)
n Low shutdown current (<1 µA)
n 5-Lead SOT-23 package
n Uses tiny capacitors and inductors
n Cycle-by-cycle current limiting
n Internally compensated
Applications
n White LED Current Source
n PDA’s and Palm-Top Computers
n Digital Cameras
n Portable Phones and Games
n Local Boost Regulator
Typical Application Circuit
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© 2003 National Semiconductor Corporation DS200591
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Typical Application Circuit (Continued)
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White LED Flash Application
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Connection Diagram
Top View
20059111
5-Lead SOT-23 Package
See NS Package Number MF05A
Ordering Information
Order Number Package Type Package Drawing Supplied As Package ID
LM2731XMF
1K Tape and Reel S51A
LM2731XMFX
LM2731YMF
SOT23-5
MF05A
3K Tape and Reel
1K Tape and Reel
S51A
S51B
LM2731YMFX
3K Tape and Reel S51B
Pin Description
Pin Name
Function
1 SW Drain of the internal FET switch.
2
GND
Analog and power ground.
3 FB Feedback point that connects to external resistive divider.
4
SHDN
Shutdown control input. Connect to Vin if the feature is not used.
5 VIN Analog and power input.
3 www.national.com
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Номер в каталоге | Описание | Производители |
LM2731 | 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23 | National Semiconductor |
LM2731 | 1.6 MHz Boost Converter With 30V Internal FET Switch in SOT-23 (Rev. G) | Texas Instruments |
LM27313 | LM27313/-Q1 1.6-MHz Boost Converter With 30-V Internal FET Switch in SOT-23 (Rev. E) | Texas Instruments |
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