Features: Good Efficiency Over a Very Wide Load Range
Very Low Output Voltage Ripple
Small, Mini-SO-8 Package (Half the Footprint of Standard 8 pin SO Package)
1.09 mm Package Height
Up to 2 MHz Switching Frequency
8V to 14V Operating Voltage
1.1V Start-up Voltage
1.24V - 14V Adjustable Output Voltage
Up to 2A Load Current at low Output Voltages
0.17 Internal MOSFET
Up to 90% Regulator Efficiency
80 A Typical Operating Current (into VDD pin of supply)
<2.5A Guaranteed Supply Current In Shutdown
4mm x 4mm Thermally Enhanced LLP Package Option
ApplicationCameras, 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
SpecificationsIf Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications.
SW Pin Voltage −0.5 V to 14.5V
BOOT, VDD, EN and FB Pins −0.5V to 10V
FREQ Pin 100A
TJmax (Note 2) 150
Storage Temperature Range −65 to +150
Lead Temp. (Soldering, 5 sec) 260
Power Dissipation (TA=25) 500mW
(Note 2)
DescriptionThe 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.
LM2623 Data Sheet
