Boost Converter. LM2623 Datasheet

LM2623 Converter. Datasheet pdf. Equivalent


Part LM2623
Description DC-DC Boost Converter
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LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost LM2623 Datasheet
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LM2623
Product
Folder
Order
Now
Technical
Documents
Tools &
Software
Support &
Community
LM2623
SNVS188I – MAY 2004 – REVISED OCTOBER 2017
LM2623 General-Purpose, Gated-Oscillator-Based DC-DC Boost Converter
1 Features
1 Good Efficiency Over a Very Wide Load Range
• Very Low Output Voltage Ripple
• Up to 2-MHz Switching Frequency
• 0.8-V to 14-V Operating Voltage
• 1.1-V Start-up Voltage
• 1.24-V to 14-V Adjustable Output Voltage
• Up to 2-A Load Current at Low Output Voltages
• 0.17-Ω Internal MOSFET
• Up to 90% Regulator Efficiency
• 80-µA Typical Operating Current (Into VDD Pin of
Supply)
• < 2.5-µA Ensured Supply Current In Shutdown
• Small 8-Pin VSSOP Package (Half the Footprint
of Standard 8-Pin SOIC Package); 1.09-mm
Package Height
• 4-mm × 4-mm Thermally Enhanced WSON
Package Option
2 Applications
• 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
3 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 0.8 V and 14 V and converts it
into a regulated output voltage between 1.24 V and
14 V. 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 (300 kHz 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: See Non-Linear Effect and Choosing The
Correct C3 Capacitor 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.
Device Information(1)
PART NUMBER PACKAGE
BODY SIZE (NOM)
LM2623
WSON (14)
VSSOP (8)
4.00 mm × 4.00 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
VIN
2 Cells
R3
150k
+ C1
22PF
Typical Application Circuit
D1
L1
4.7PH
C3
3A
4.7pF
8
3
FREQ
1
PGND
SW 7
BOOT
LM2623
2
EN
6
V DD
4
FB
SGND
5
RF1
300k
RF2
100k
5V
C2
100PF
tant
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.



LM2623
LM2623
SNVS188I – MAY 2004 – REVISED OCTOBER 2017
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration And Functions ........................ 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics .............................................. 5
7 Detailed Description .............................................. 7
7.1 Overview ................................................................... 7
7.2 Functional Block Diagram ......................................... 7
7.3 Feature Description................................................... 7
7.4 Device Functional Modes.......................................... 9
8 Applications And Implementation...................... 10
8.1 Application Information............................................ 10
8.2 Typical Application .................................................. 10
9 Power Supply Recommendations...................... 12
10 Layout................................................................... 12
10.1 Layout Guidelines ................................................. 12
10.2 Layout Example .................................................... 13
10.3 WSON Package Devices ...................................... 13
11 Device And Documentation Support................. 14
11.1 Device Support...................................................... 14
11.2 Documentation Support ........................................ 14
11.3 Receiving Notification of Documentation Updates 14
11.4 Community Resources.......................................... 14
11.5 Trademarks ........................................................... 14
11.6 Electrostatic Discharge Caution ............................ 14
11.7 Glossary ................................................................ 14
12 Mechanical, Packaging, And Orderable
Information ........................................................... 14
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision H (November 2014) to Revision I
Page
• Changed Handling Ratings table to ESD Ratings to comply with current format .................................................................. 4
• Moved Storage temperature spec to Abs Max table ............................................................................................................. 4
• Added separate row for SW pin HBM ESD rating ................................................................................................................. 4
• Added condition to Recommended Operating Conditions table ............................................................................................ 4
• Changed Updated RθJA value for NHE package from "40 – 56" to "46.5"°C/W and DGK package from "240" to
152.5" °C/W; added additional thermal information................................................................................................................ 4
Changes from Revision G (December 2005) to Revision H
Page
• Added Device Information and Handling Rating tables, Feature Description, Device Functional Modes, Application
and Implementation, Power Supply Recommendations, Layout, Device and Documentation Support, and
Mechanical, Packaging, and Orderable Information sections; moved some curves to Application Curves section .............. 1
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Product Folder Links: LM2623
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