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LM2623ALD データシート(PDF) 1 Page - Texas Instruments

部品番号 LM2623ALD
部品情報  LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
Logo TI - Texas Instruments

LM2623ALD データシート(HTML) 1 Page - Texas Instruments

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SW
4.7pF
C3
4.7PH
L1
FREQ
7
2
6
4
8
3
1
PGND
SGND
BOOT
EN
FB
D1
3A
5V
RF2
100k
C1
22PF
V
IN
2 Cells
R3
150k
RF1
300k
+
V
DD
LM2623
C2
100PF
tan
t
5
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
DESCRIPTION
The LM2623 is a high efficiency, general purpose,
2
Good Efficiency Over a Very Wide Load Range
step-up
DC-DC
switching
regulator
for
battery-
Very Low Output Voltage Ripple
powered and low input voltage systems. It accepts an
Small, VSSOP-8 Package (Half the Footprint of
input voltage between .8 and 14 volts and converts it
Standard 8 pin SOIC Package)
into a regulated output voltage between 1.24 and 14
volts. Efficiencies up to 90% are achievable with the
1.09 mm Package Height
LM2623.
Up to 2 MHz Switching Frequency
In order to adapt to a number of applications, the
.8V to 14V Operating Voltage
LM2623 allows the designer to vary the output
1.1V Start-up Voltage
voltage, the operating frequency (300kHz to 2 MHz)
1.24V - 14V Adjustable Output Voltage
and duty cycle (17% to 90%) to optimize the part's
performance. The selected values can be fixed or can
Up to 2A Load Current at Low Output Voltages
vary with battery voltage or input to output voltage
0.17
Ω Internal MOSFET
ratio. The LM2623 uses a very simple, on/off
Up to 90% Regulator Efficiency
regulation mode to produce good efficiency and
stable operation over a wide operating range. It
80 µA Typical Operating Current (into VDD Pin
normally regulates by skipping switching cycles when
of Supply)
it reaches the regulation limit (Pulse Frequency
<2.5µA Specified Supply Current In Shutdown
Modulation).
4mm x 4mm Thermally Enhanced WSON
Note:
Please
read
the
Non-Linear
Effect
and
Package Option
Choosing The Correct C3 Capacitor sub-sections of
the Design Procedure section of this data sheet, so
APPLICATIONS
that any challenges with designing with this part can
be taken into account before a board design/layout is
Cameras, Pagers and Cell Phones
finalized.
PDAs, Palmtop Computers, GPS Devices
For
Alternative
Solutions,
See
Also:
LM2700,
White LED Drive, TFT or Scanned LCDs
LM2622, LM2731, LM2733, and LM2621.
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
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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