LM2621 1.2-V to 14-V Input Voltage, Step-Up DC-DC | TI.com

LM2621 (ACTIVE)

1.2-V to 14-V Input Voltage, Step-Up DC-DC

 

Recommended alternative parts

  • LM2623  -  Operates With Input Voltages As Low As 0.8V
  • TPS61170  -  1.2A Switch, High Voltage Boost Converter in 2x2mm QFN Package
  • LM27313  -  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 converters (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)
Features
Duty cycle (Max) (%)
Operating temperature range (C)
Type
Rating
Package Group
LM2621 LM2623 LM2731 LM27313 LM2733 LM2735 LM2735-Q1 TLV61046A TPS55340 TPS61040 TPS61087 TPS61170
1.2     0.8     2.7     2.7     2.7     2.7     2.7     1.8     2.9     1.8     2.5     3    
14     14     14     14     14     5.5     5.5     5.5     32     6     6     18    
1.24     1.24     1.23     4     3     3     3     3.3     3     1.8     3     3    
14     14     22     28     40     24     24     28     38     28     18.5     38    
2.85     2.85     1.5     1.25     1.5     2.25     2.25     0.9     6.6     0.4     4     1.2    
1     1     1     1     1     1     1     1     1     1     1     1    
2000     300     600     1150     400     520     520     850     100     50     900     1000    
2000     2000     1600     1900     1850     1600     1600     1250     1200     1000     1500     1200    
0.08     0.08     2     2.1     1.1     7     7     0.11     0.5     0.028     0.075     2.3    
Enable     Enable     Enable     Enable
Light Load Efficiency    
Enable
Light Load Efficiency    
Enable     Enable     Enable
Light Load Efficiency
Load Disconnect    
Enable
Frequency Synchronization
Light Load Efficiency    
Enable     Enable
Power Good    
Enable
Light Load Efficiency    
80     90     93     88     96     99     99     90     90     88     90     93    
-40 to 85     -40 to 85