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LM2623 데이터시트(PDF) 1 Page - Texas Instruments

부품명 LM2623
상세설명  General Purpose, Gated Oscillator Based, DC/DC Boost Converter
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LM2623
www.ti.com
SNVS188G – MAY 2004 – REVISED DECEMBER 2005
LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter
Check for Samples: LM2623
1
FEATURES
<2.5µA Guaranteed Supply Current In
Shutdown
2
Good Efficiency Over a Very Wide Load Range
4mm x 4mm Thermally Enhanced LLP Package
Very Low Output Voltage Ripple
Option
Small, Mini-SO-8 Package (Half the Footprint
of Standard 8 pin SO Package)
APPLICATIONS
1.09 mm Package Height
Cameras, Pagers and Cell Phones
Up to 2 MHz Switching Frequency
PDAs,Palmtop Computers, GPS devices
.8V to 14V Operating Voltage
White LED Drive, TFT or Scanned LCDs
1.1V Start-up Voltage
Flash Memory Programming
1.24V - 14V Adjustable Output Voltage
Hand-Held Instruments
Up to 2A Load Current at low Output Voltages
1, 2, 3 or 4 Cell Alkaline Systems
0.17
Ω Internal MOSFET
1, 2 or 3 Cell Lithium-ion Systems
Up to 90% Regulator Efficiency
80 µA Typical Operating Current (into VDD pin
of supply)
DESCRIPTION
The LM2623 is a high efficiency, general purpose, step-up DC-DC switching regulator for battery-powered and
low input 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 regulation mode to produce good efficiency and stable operation over a wide operating range.
It normally regulates by skipping 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
Procedure 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.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2004–2005, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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