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PDF LM2623LDX Data sheet ( Hoja de datos )

Número de pieza LM2623LDX
Descripción General Purpose/ Gated Oscillator Based/ DC/DC Boost Converter
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! LM2623LDX Hoja de datos, Descripción, Manual

July 2003
LM2623
General Purpose, Gated Oscillator Based, DC/DC Boost
Converter
General Description
The LM2623 is a high efficiency, general purpose, step-up
DC-DC switching regulator for battery-powered and low in-
put voltage systems. It accepts an input voltage between .8
and 14 volts and converts it into a regulated output voltage
between 1.24 and 14 volts. Efficiencies up to 90% are
achievable with the LM2623.
In order to adapt to a number of applications, the LM2623
allows the designer to vary the output voltage, the operating
frequency (300kHz to 2 MHz) and duty cycle (17% to 90%)
to optimize the part’s performance. The selected values can
be fixed or can vary with battery voltage or input to output
voltage ratio. The LM2623 uses a very simple, on/off regu-
lation mode to produce good efficiency and stable operation
over a wide operating range. It normally regulates by skip-
ping switching cycles when it reaches the regulation limit
(Pulse Frequency Modulation).
Note: Please read the "Non-Linear Effect" and "Choosing
The Correct C3 Capacitor" sub-sections of the Design Pro-
cedure section of this data sheet, so that any challenges with
designing with this part can be taken into account before a
board design/layout is finalized.
For Alternative Solutions, See Also: LM2700, LM2622,
LM2731, LM2733, and LM2621.
Features
n Good Efficiency Over a Very Wide Load Range
n Very Low Output Voltage Ripple
n Small, Mini-SO-8 Package (Half the Footprint of
Standard 8 pin SO Package)
n 1.09 mm Package Height
n Up to 2 MHz Switching Frequency
n .8V to 14V Operating Voltage
n 1.1V Start-up Voltage
n 1.24V - 14V Adjustable Output Voltage
n Up to 2A Load Current at low Output Voltages
n 0.17Internal MOSFET
n Up to 90% Regulator Efficiency
n 80 µA Typical Operating Current (into VDD pin of supply)
n <2.5µA Guaranteed Supply Current In Shutdown
n 4mm x 4mm Thermally Enhanced LLP Package Option
Applications
n Cameras, Pagers and Cell Phones
n PDAs,Palmtop Computers, GPS devices
n White LED Drive, TFT or Scanned LCDs
n Flash Memory Programming
n Hand-Held Instruments
n 1, 2, 3 or 4 Cell Alkaline Systems
n 1, 2 or 3 Cell Lithium-ion Systems
Typical Application Circuit
© 2003 National Semiconductor Corporation DS200388
20038801
www.national.com

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LM2623LDX pdf
Electrical Characteristics (Continued)
Note 8: Junction to ambient thermal resistance (θJA) is taken from a thermal modeling result, performed under the conditions and guidelines set forthe in the JEDEC
standard JESD51-17. The test board is a 4 layer FR-4 board measuring 102mm x 76mm x 1.6mm with a 3 x 2 array of thermal vias. The ground plane on the board
is 50mm x 50 mm. Thickness of copper layers are 36mm/18mm/18mm/36mm (1.5oz/10z/1oz/1.5ox). Ambient temperature in simulation is 22˚C, still air. Power
dissipation is 1W. (The DAP is soldered.) Fore more information on LLP thermal topics, as well as LLP mounting and soldering specifications please refer to
Application Note 1187: Leadless Leadframe Package (LLP).
Note 9: Exposed DAP soldered to an exposed 1sq. inch area of 1 oz. copper. Thermal resistance can be decreased by using more copper are to dissipate heat.
5 www.national.com

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LM2623LDX arduino
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
NS Package Number LDA14A
For Order Numbers, refer to the table in the "Ordering Information" section of this document.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant
into the body, or (b) support or sustain life, and
whose failure to perform when properly used in
accordance with instructions for use provided in the
labeling, can be reasonably expected to result in a
significant injury to the user.
2. A critical component is any component of a life
support device or system whose failure to perform
can be reasonably expected to cause the failure of
the life support device or system, or to affect its
safety or effectiveness.
National Semiconductor
Americas Customer
Support Center
Tel: 1-800-272-9959
www.national.com
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Support Center
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Tel: 81-3-5639-7560
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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