Low Input Voltage, Step-Up DC-DC - LM2621

LM2621 (ACTIVE)

Low Input Voltage, Step-Up DC-DC

 

Recommended alternative parts

  • LM2623  -  Operates With Input Voltages As Low As 0.8V
  • LM2698  -  Wider Switch Voltage , Fixed Frequency
  • LM27313  -  Fixed Frequency , Smaller Package
  • LM27313-Q1  -  Fixed Frequency , Smaller Package
  • LM2733  -  1A 40V Switch Boost Regulator In SOT-23
  • LM3224  -  Wider Switch Voltage , Fixed Frequency

Description

The LM2621 is a high efficiency, step-up DC-DC switching regulator for battery-powered and low input voltage systems. It accepts an input voltage between 1.2 V and 14 V and converts it into a regulated output voltage. The output voltage can be adjusted between 1.24 V and 14 V. It has an internal 0.17-Ω N-Channel MOSFET power switch. Efficiencies up to 90% are achievable using the LM2621.

The high switching frequency (adjustable up to 2 MHz) of the LM2621 allows for tiny surface mount inductors and capacitors. Because of the unique constant-duty-cycle gated oscillator topology very high efficiencies are realized over a wide load range. The supply current is reduced to 80 µA because of the BiCMOS process technology. In the shutdown mode, the supply current is less than 2.5 µA.

The LM2621 is available in a VSSOP-8 package. This package uses half the board area of a standard 8-pin SOIC and has a height of just 1.09 mm.

Features

  • Small VSSOP8 Package (Half the Footprint of
    Standard 8-Pin SOIC Package)
  • 1.09-mm Package Height
  • Up to 2-MHz Switching Frequency
  • 1.2-V to 14-V Input Voltage
  • 1.24-V to 14-V Adjustable Output Voltage
  • Up to 1A Load Current
  • 0.17-Ω Internal MOSFET
  • Up to 90% Regulator Efficiency
  • 80-µA Typical Operating Current
  • < 2.5-µA Specified Supply Current In Shutdown

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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
Approx. Price (US$)
LM2621 LM2698 LM27313 LM27313-Q1 LM2733
1.2     2.2     2.7     2.7     2.7    
14     12     14     14     14    
1.24     2.2     4     4     3    
14     17     28     28     40    
2.85     1.35     1.25     1.25     1.5    
1     1     1     1     1    
    1150     1150     400    
2000       1900     1900     1850    
0.08     1.3     2.1     2.1     1.1    
Enable       Enable
Light Load Efficiency    
Enable
Light Load Efficiency    
Enable
Light Load Efficiency    
    88     88     96    
-40 to 85     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Automotive     Catalog    
VSSOP     VSSOP     SOT-23     SOT-23     SOT-23    
0.68 | 1ku     1.70 | 1ku     0.60 | 1ku     0.65 | 1ku     0.85 | 1ku    

Related end equipment

  • PDAs, Cellular Phones
  • 2-Cell and 3-Cell Battery-Operated Equipment
  • PCMCIA Cards, Memory Cards
  • Flash Memory Programming
  • TFT/LCD Applications
  • 3.3-V to 5.0-V Conversion
  • GPS Devices
  • Two-Way Pagers
  • Palmtop Computers
  • Hand-Held Instruments

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WEBENCH® Designer LM2621

  Min   Max Range
Vin  V 1.2 to 14.0V
Vout  V 2.5 to 14.0V
Iout  A ≤ 2.85A
Ambient Temp  °C -40 to 125°C


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