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 1.2V and 14V and converts it into a regulated output voltage. The output voltage can be adjusted between 1.24V and 14V. It has an internal 0.17 N-Channel MOSFET power switch. Efficiencies up to 90% are achievable using the LM2621.

The high switching frequency (adjustable up to 2MHz) 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 80µA because of the BiCMOS process technology. In the shutdown mode, the supply current is less than 2.5µA.

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


Features

  • Small Mini-SO8 Package (Half the Footprint of Standard 8-Pin SO Package)
  • 1.09 mm Package Height
  • Up to 2 MHz Switching Frequency
  • 1.2V to 14V Input Voltage
  • 1.24V - 14V Adjustable Output Voltage
  • Up to 1A Load Current
  • 0.17 Internal MOSFET
  • Up to 90% Regulator Efficiency
  • 80 µA Typical Operating Current
  • <2.5µA Guaranteed Supply Current In Shutdown

View more

Parametrics Compare all products in Step-Up (Boost) Converter

 
Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Topology
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Switch Current Limit (Typ) (A)
Brand
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM2621 LM2623 LM2698 LM27313 LM27313-Q1 LM2733 LM3224
1     1     1     1     1     1     1    
1.2     0.8     2.2     2.7     2.7     2.7     2.7    
14     14     12     14     14     14     7    
1.24     1.24     2.2     4     4     3      
14     14     17     28     28     40     20    
Boost
Flyback    
Boost
Flyback    
Boost     Boost     Boost     Boost     Boost    
2000     2000              
0.08     0.08     1.3     2.1     2.1     2.1     1.3    
2.85     2.2     1.35     1     1     1     2.6    
SIMPLE SWITCHER       SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER     SIMPLE SWITCHER      
Enable     Enable              
Catalog     Catalog     Catalog     Catalog     Automotive     Catalog     Catalog    
-40 to 85     -40 to 85     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 125    
8VSSOP     14WSON
8VSSOP    
8VSSOP     5SOT-23     5SOT-23     5SOT-23     8VSSOP    
0.65 | 1ku     0.50 | 1ku     1.70 | 1ku     0.60 | 1ku     0.65 | 1ku     0.85 | 1ku     1.05 | 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
  • 3.3V to 5.0V Conversion
  • GPS Devices
  • Two-Way Pagers
  • Palmtop Computers
  • Hand-Held Instruments

Featured tools and software

WEBENCH® LM2621
    Min   Max   Range  
  Vin V    1.20 – 14.00V  
  Vout V    1.24 – 14.00V  
  Iout A    ≤ 2.85A  
  Ambient Temp °C    -40 – 125°C  
Footprint BOM Cost Efficiency
 
   
 
 
'U1 R1 C3 Rt Rfbb Rfbt D1 L1 Cin Cout Cff '
 
What are WEBENCH® tools?

Companion parts

Part # Name Product Family Comments
LM2704   Micropower Step-up DC/DC Converter with 550mA Peak Current Limit   LED DRIVER - BACKLIGHT    Low Power 500mA Switch Boost In SOT-23  
Click Here