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LM2623MMX Datasheet

  • LM2623MMX

  • General Purpose, Gated Oscillator Based, DC/DC Boost Convert...

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LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter
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鈥檚 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
0.17鈩?Internal MOSFET
n
Up to 90% Regulator Efficiency
n
80 碌A Typical Operating Current (into V
DD
pin of supply)
n
<
2.5碌A Guaranteed Supply Current In Shutdown
n
4mm x 4mm Thermally Enhanced LLP Package Option
Applications
n
n
n
n
n
n
n
Cameras, Pagers and Cell Phones
PDAs,Palmtop Computers, GPS devices
White LED Drive, TFT or Scanned LCDs
Flash Memory Programming
Hand-Held Instruments
1, 2, 3 or 4 Cell Alkaline Systems
1, 2 or 3 Cell Lithium-ion Systems
Typical Application Circuit
20038801
漏 2003 National Semiconductor Corporation
DS200388
www.national.com

LM2623MMX 產(chǎn)品屬性

  • National Semiconductor (TI)

  • 14 V

  • 300 KHz to 2000 KHz

  • 1.24 V to 14 V

  • 2 A

  • 1

  • + 85 C

  • SMD/SMT

  • MSOP

  • - 40 C

  • Reel

  • 3500

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