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Details, datasheet, quote on part number:LM2623
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| Part: | LM2623 |
| Category: | Power Management => Regulators => Switching Regulators |
| Description: | LM2623 - General Purpose, Gated Oscillator Based, DC/DC Boost Converter, Package: Llp, Pin Nb=14 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM2623 datasheet File size : 221 kB |
| Request For quote: | Find where to buy LM2623
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Datasheet text preview:
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 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.
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 Internal 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 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
© 2003 National Semiconductor Corporation
DS200388
www.national.com
LM2623
Connection Diagram
LLP Package
20038802
Top View Mini SO-8 (MM) Package
20038818
Top View
Ordering Information
Order Number LM2623MMX LM2623AMMX LM2623AMM LM2623MM LM2623LDX LM2623ALDX LM2623LD LM2623ALD Package Type Mini SO-8 Mini SO-8 Mini SO-8 Mini SO-8 LLP-14 LLP-14 LLP-14 LLP-14 NSC Package Drawing MUA08A MUA08A MUA08A MUA08A LDA14A LDA14A LDA14A LDA14A Package Marking S46B S46A S46A S46B 2623AB 2623A 2623AB 2623A Supplied As 3000 Units on Tape and Reel 3000 Units on Tape and Reel 1000 Units on Tape and Reel 1000 Units on Tape and Reel 4500 Units on Tape and Reel 4500 Units on Tape and Reel 1000 Units on Tape and Reel 1000 Units on Tape and Reel
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LM2623
Pin Description
LLP-14 Pin 1 2, 3 4 5 1 2 3 MSOP-8 Pin Name NC PGND EN FREQ No Connect Power Ground (LLP Pins 2 & 3 must be shorted together). Active-Low Shutdown Input Frequency Adjust. An external resistor connected between this pin and a voltage source sets the switching frequency of the LM2623. Output Voltage Feedback No Connect No connect Signal Ground Power Supply for Internal Circuitry Bootstrap Supply for the Gate Drive of Internal MOSFET Power Switch Drain of the Internal MOSFET Power Switch. (LLP Pins 12 & 13 must be shorted together). No Connect To be soldered to board for enhanced thermal dissipation. To be electrically isolated/floating. Function
6 7 8 9 10 11 12, 13 14 DAP
4
FB NC NC
5 6 7 8
SGND VDD BOOT SW NC DAP
3
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