General Purpose, Gated Oscillator Based, DC/DC Boost Converter - LM2623

LM2623 (ACTIVE)

General Purpose, Gated Oscillator Based, DC/DC Boost Converter

 

Recommended alternative parts

  • LM2731  -  40V/1A Internal Switch, SOT-23, PWM Boost Regulator
  • LM3224  -  Higher Efficiency, Pin Selectable PWM Frequency Allowing Easy Filtering And Low Noise

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: Please read the Non-Linear Effect and Choosing the Correct C3 Capacitor sections 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

  • 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

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Parametrics Compare all products in Boost Converter (Integrated Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Switch Current Limit (Typ) (A)
Regulated Outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Special Features
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
LM2623
0.8   
14   
1.24   
14   
2.85   
1   
300   
2000   
0.08   
Enable   
90   
-40 to 85   
Catalog   
VSSOP
WSON