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 batterypowered
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.